SPACE ALLOWANCES FOR BUILDING SERVICES

DISTRIBUTION SYSTEMS

- detai I design stage

M. Hejab C. Parsloe

I. !I

The Building Services Research and Information Association Old Bracknell Lane West Bracknell, Berkshire RG12 7AH Tel: (0344) 426511 Fax: (0344) 487575

ACKNOWLEDGEMENTS

The technical information and procedures in this Guide were developed under the guidance of a project steering group drawn from ip.dustry sponsors and BSRIA staff:

The Steering Group contributors were:

C. Parsloe (Chairman) M. Hejab I. Allen M. Smith K. Venables P. Strangeway R. Porter E. Innes N. Barnard E. Brandl

The project was jointly funded by the Department of the Environment as part of its sponsorship contract with BSRIA and the following industry sponsors:

Gifford Building Services National Westminster Bank pIc. Health and Safety Executive Shepherd Engineering Services Ltd. Home Office Directorate of Work Sulzer (UK) Building Services Ltd. Houseman (Burnham) Ltd. Varming MuIcahy Reilly Associates Marks and Spencer pIc. Venables Associates Ltd.

All rights reserved. No part ofthis publication may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying, recordi1'1(. or otherwise, without the prior written permission of the publishers.

ISBN 0 86226 350 7 ©BSRJA Dl'l'l'lIIht'" ll)l)'l

Setting & Artwork by ESP Ltd. Printed hy AshfOl'd (:ololll' 1II'rlili

(0344) 780345 (()7(),~l nHH21

r \

~ 1, I

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PREFACE

The space requirements for services in modern buildings can be considerable. The proper allocation and planning of service areas can result in significant improvements in the efficiency of installation and the long term maintenance of the systems.

This publication has been produced as part of BSRIA's programme of work under "Design for Maintainability". The information provided has been drawn mainly from BSRIA's earlier publication TN 3/79. "Space requirements for building services distribution systems - detail design stage". This information has been expanded and updated where necessary.

CONTENTS

PART A • ALLOWANCES FOR DUCTWORK INSTALLATIONS

A1 RECTANGULAR DUCTS

A1.1 STANDARD SIZES

A1.2 JOINTS AND STIFFENERS

A1.2.1 LOW AND MEDIUM PRESSURE DUCTS

A1.2.2 HIGH PRESSURE DUCTS (UP TO 2500 Pal

A1.3 FITTINGS

A1.3.1 BENDS

A1.3.2 BRANCHES

A1.3.3 OFFSETS

A1.3.4 TAPERS

A2 CIRCULAR DUCTS

A2.1 STANDARD SIZES WITH ALLOWANCES FOR JOINTS

A2.2 FITTINGS

A2.2.1 RADJUSED BENDS

A2.2.2 BRANCHES

A2.2.3 OFFSETS

A2.2.4 TAPERS

A3 FLAT OVAL DUCTS

A3.1 STANDARD SIZES WITH ALLOWANCES FOR JOINTS AND

INSULATION

A3.2 FITTINGS

A3.2.1 BENDS

A3.2.2 BRANCHES

A3.2.3 OFFSETS

PAGE NO.

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1

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2

2

3

4

4

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6

6

7

7

8

8

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9

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10

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11

11

11

,/

PAGE NO. PAGE NO.

~--~

J

CONDUIT SADDLESC5

C5.1 SADDLES

SPACER BAR SADDLESC5.2

DISTANCE SADDLES C5.3

STEEL CONDUITC6

STANDARD CONDUIT SIZES C6.1

STANDARD LONG RADIUS BEND C6.2

CONDUIT BOXES C7

STANDARD BOXES C7.1

STANDARD DEEP BOXES C7.2

WORKING SPACE AROUND ELECTRICAL SERVICESC8

C8.1 CABLE - HANGERS

C8.2 CABLE - CLEATS

C8.2.1 CLAW TYPE

C8.2.2 CLAMP TYPE (1)

C8.2.3 CLAMP TYPE (2)

C8.2.4 MULTI - CABLE

C8.3 STEEL CONDUIT

C8.4 STEEL TRUNKING

PART D - GENERAL DATA

ISO METRIC BOLT POSITIONINGD1

ANTHROPOMETRICD2

REFERENCES

PAGE NO.

46

46

47

48

49

49

49

50

50

51

52

52

53

53

54

56

58

59

59

60

60

61

63

PART A ALLOWANCES FOR DUCTWORK INSTALLATIONS

A1

A1.1

RECTANGULAR DUCTS

STANDARD SIZES Table 1 sets out the range of standard sizes for rectangular ductwork.

Nominal duct size, Long side (mm)

1200

150 200 250 300 400 500 600 800 1000 1200 1400 1600 1800 2000

100

800

1000

200

150

600

E .s 250 CII 'C"0 f-------1f-----+---f'--:>~~~~~~~~~~~ .........c+______.jL-___I__-_l________1

1:: ,g 300 fI)

~f------If-----+--+---t~.;,..p...~~~~~~~~~~-.---d~-rl---l--------1

'0 13 400 :::s 'C 'i/---/-----+--+---t----P-~~~~"'d_2~~~~~~~>.2'k_~..J...o:__~

c's 500 o z

Table 1: Range ofpreferred standard duct sizes (source: HVCA DW1142: 1988).

1

A1.2.2 HIGH PRESSURE DUCTS (UP TO 2500 Pa) JOINTS AND STIFFENERS A1.2 Table 3 gives suitable allowances for flanged joints with stiffeners on uninsulated sheet metal rectangular ductwork (NB sizes up to 400 mm could be joined by plain socket and spigot ­

LOW AND MEDIUM PRESSURE DUCTSA1.2.1 dimensions shown in Table 2). The dimensions indicated in Table 2 are suitable allowances for socket and spigot or cleated joints to uninsulated sheet metal rectangular ductwork.

Nominal duct size, Long side (mm)

150 200 250 300 400 500 600 800 1000 1200 1400 1600 1800 2000

~~I!ISIS:100 100

~I!100

~~~I!IS 100 100 100

150 150 150 150 150 150 150

~IS~IS~I!150

IS200 200 200 200 200 200 200

I!IS: 200

.-.

~Is:I~IS!E E 250...... GI 250 250 250 250 250 250 250 'C 'iii

IS:IS~I!~! I'S:~ 0 300.J: (fJ 300 300 300 300 300

I!300 300

ai

IS:Is:Is:!N ISI!t'iii.. 400u :s 400 460 460 460. 460 460 460 460 'C

iii

~~~Is:~Is:Is:1\1\,S: E 500 0 560 560 560 560 560 560 560 Z

~ISIs:I~Is:IS11\11\600 660 660

IS! 650 680

! 680 680

Is:~1\1\800 850 850 880 880 880

~I!~I.S:1\1\1000 1060 1060 1060 1060

~~~1\1\1200 1260 1260 1260

Table 2: Allowances for joints and stiffeners to low and medium pressure sheet

metal rectangular ducts.

2

>--­

Nominal duct size, Long side (mm)

150 200 250 300 400 500 600 800 1000 1200 1400 1600 1800 2000

I!~! ~!100 150 150 150 150 150

! ! ! ! ! ! !150 200 200 200 200 ,200 200 200

! ! Is:! IS! IS200 250 250 250 250 250 250 280

.-. E

! ! ! ! ! ! !E 250...... GI 'C 300 300 300 300 300 330 330'iii t: I!! ! ! ISIS:!0 300.J: (fJ

ai 350 350 350 350 380 380 400 N

!"iii ! ! ! ! ! Is:!t) 400 :s 'C 450 450 450 480 480 500 500 500 iii

~! !.S: ! ! Is:! ! !E 500 0 Z 550 550 580 580 600 600 600 600 620

! ! ! ! ! ! IS!600 650 680 680 700 700 700 700 720

! ! ! Is:Is:! !800 880 880 900 900 900 900 920

! ! ! ! : !1000 1080 1100 1100 1100 1100 1120

I!! ts:! t1200 1300 1300 1300 1300 1320

Table 3: Allowances for joints and stiffeners to high pressure sheet metal rectangular ducts,

3

A1.3 FITTINGS A1.3.2 BRANCHES

A1.3.1 BENDS Table 5 gives allowances for rectangular shoe branches.

Table 4 gives suitable allowances for short, medium or long radius bends in uninsulated rectangular ducts. A W

o=l R

Shoe branch

Nominal duct size W (mm) Ductwork radius R (mm)

Short Medium Long

150 100 100 150

200 100 100 200

250 100 125 250

300 100 150 300

400 200 400

500 250 500

600 300 600

800 400 800

1000 500 1000

1200 600 1200

1400 700 1400

1600 800 1600

1800 900 1800

2000 1000 2000

Branch duct width W Dimension A (mm) (mm)

Up to 200 75

200 - 300 100

300 - 400 125

400 - 600 150

> 600 200

Table 5: Dimensions at shoe branches in rectangular or circular ducts.

Alternatives:

90° branch Angled branch

Table 4: Dimensions for radius bends in sheet metal rectangular ducts.

4 5

A2 A1.3.3 OFFSETS

Angles for offsets in uninsulated sheet metal rectangular ducts are shown in Figure 1.

A2.1

Angled

Radiused

Min radius 100mm

Figure 1: Angles for offsets in rectangular ducts.

A1.3.4 TAPERS Angles for shape changes in uninsulated sheet metal re~tangular ducts are shown in Figure 2.

Without Splitters

With Splitters

For details of maximum angle refer to duct manufacturer

Figure 2: Angles for tapers at expansions and contractions in rectangular ducts.

6

CIRCULAR DUCTS

STANDARD SIZES WITH ALLOWANCES FOR JOINTS The dimensions for standard sizes of circular ducting, together with suitable allowances for cross joints are shown in Table 6.

ISO standard size (nominal diameter)

(mm)

Diameter over socket and spigot joint

(mm)

Diameter over angle flanged joint

(mm)

63 63 113

71 71 121

80 80 130

90 90 140

100 100 150

112 112 162

125 125 175

140 140 190

160 160 210

180 180 230

200 200 250

224 224 274

250 250 300

280 280 330

315 315 365

355 355 405

400 400 450

450 450 500

500 500 550

560 560 610

630 630 680

710 710 760

800 800 860

900 900 960

1000 1000 1060

1120 - 1200

1250 - 1330

Table 6: Dimensions for circular ducts with allowances for joints. N.B. Data valid across all pressure classes (low, medium, high).

7

A2.2 FITTINGS A2.2.2 BRANCHES

Figure 3 shows the main alternatives for circular duct branch fittings. A2.2.1 RADIUSED BENDS

Table 7 gives suitable allowances for medium and long radius bends in uninsulated circular ducts.

0

Square22.so~

11.25° I. 0

MitredR

Angled ConicalRadiused bend Segmented bend

Nominal duct diameter D Ductwork bend radius R (mm) (mm) Medium Long Segmented

63 32 63 Governed by

minimum

length of

segment

71 36 71

80 40 80

90 45 90

100 50 100

112 56 112

125 63 125

140 70 140

160 80 160

180 90 180

200 100 200

224 112 224

250 125 250

280 140 280

315 158 -

355 . 178 -

400 200 -450 - -

500 - -560 - -

Shoe 6(dimensions as for rectangular ducts Bellmouth Tangential

• refer to section A1.3.2)

Figure 3: Circular duct branches.

A2.2.3 OFFSETS A2.2.4 TAPERS Angles for offsets in uninsulated sheet metal Angles for shapechanges in uninsulated circular ducts are shown in Figure 4. circular ducts are shown in Figure 5.

Min radius 100mm

Figure 4: Angles for offsets in circular Figure 5: Angles for tapers at ducts. expansions and contractions

in circular ducts. Table 7: Dimensions for radius and segmented bends in circular ductwork.

8 9

Concentric

Radiused

~--- -~ =====::::"'"~~!!!'!""'!!!!!_----------------

A3 FLAT OVAL DUCTS A3.2 FITTINGS

A3.1 STANDARD SIZES WITH ALLOWANCES FOR JOINTS AND INSULATION Table 8 sets out the range of standard sizes for flat oval ductwork.

A3.2.1 BENDS

Figure 6 gives suitable allowances for bends in both horizontal and vertical planes.

Cross joints for ducts below 1000 mm width will usually be of the socket and spigot type, and therefore need no additional space allowance. Cross joints for ducts greater than 1000 mm width will be flanged for which an additional 80 mm (40 mm each side) should be allowed. For insulated ducts, an additional allowance of 100 mm (50 mm each side) should be allowed within which flanged cross joints will be covered (for details of insulation thicknesses refer to Section A4).

Nominal depth of duct D (mm)

75 100 125 150 200 250 300 350 400 450 500

-E

320

360 350 330 320

400 390 370 360

440 430 410 400

480 470 450 440

520 505 490 480

545 530 520 E-3=-Co) :::s 'C-0 .s::-"0

555 525

635 605 580

715 690 660 630

800 770 740 710 685 655

'3= iii c ·s

880 845 825 790 765 735 705 680

960 930 900 875 845 815 785 755 0 Z 1040 1010 985 955 925 895 865 835

1120 1090 1065 1035 1005 975 945 915

1200 1170 1145 1115 1085 1055 1025 1000

1335 1305 1275 1245 1215 1190 1160

1465 1435 1405 1375 1350 1320

1625 1595 1570 1540 1510 1480

1785 1760 1730 1700 1670 1640

Table 8: Dimensions for flat oval ducts.

10

Segmented

Square

l~ w .1

Figure 6: Allowances for bends in flat oval ducts.

A3.2.2 BRANCHES

For branches taken from the flat profile of the duct, refer to section Al.3.2 for rectangular ducts.

F.or branches taken from the semi-circular profile of the duct, refer to section A2.2.2 for CIrcular ducts.

A3.2.3 OFFSETS

A maximum angle of 30° is permissible for offsets in either the width or depth of flat oval ducts.

11

A4 THERMAL INSULATION THICKNESSES A5 WORKING SPACE AROUND DUCTWORK

Table 9 shows typical thermal insulation thicknesses for air handling ductwork and plant. It Ad~qua.te space must be allowed around ducts for fitting of insulation, hangers and supports may be assumed that all joints, stiffeners and supports can be accommodated within the dUrIng lllstallation and for access during subsequent maintenance. Suitable allowances are thickness of the insulation. given in Figure 7.

Thermal Conductivity (W/mK)

Insulation thickness (mm)

Temperature difference °C

10 25

Up to 0.025 25 30

0.026 - 0.040 38 50

0.041 - 0.055 50 50

0.056 - 0.070 50 75

Table 9: Thermal insulation thickness for air handling ductwork and plant.

i,

I,

600

500 -E -Gl

E400u

Cll a. en Gl u C Cll... Top and bottom clearance A Cll 200 .!! 0

100

Width (or diameter) of Duct (mm)

Figure 7: Working space around ductwork.

12 13

PARTB B1.2 FLANGED JOINTS TO STEEL PIPES

Table 12 shows typical external diameters for flanged joints to steel pipes.

ALLOWANCES FOR PIPEWORK INSTALLATIONS

81 STANDARD SIZES FOR PIPEWORK

B1.1 STEEL TUBES Tables 10 and 11 set out the range of standard sizes for medium and heavy gauge steel tubes.

Nominal bore External diameter (mm)

(mm) Pressure rating (bar)

6 10 16 25

10 75 90 90 90

15 80 95 95 95

20 90 105 105 105

25 100 115 115 115

32 120 140 140 140

40 130 150 150 150

50 140 165 165 165

65 160 185 185 185

80 190 200 200 200

100 210 220 220 235

125 240 250 250 270

150 265 285 285 300

200 320 340 340 360

250 375 395 405 425

300 440 445 460 485

350 490 505 520 555

400 540 565 580 620

500 645 670 715 730

600 755 780 840 845

700 860 895 910 960

800 975 1015 1025 1085

Table 12: External diameters, for flanged joints to steel pipes in accordance with as 4504: 1969 (1975).

15

I

Nominal bore (mm)

Outside diameter

max. (mm) min. (mm)

8 13.9 13.3

10 17.4 16.8

15 21.7 21.1

20 27.2 26.6

25 34.2 33.4

32 42.9 42.1

40 48.8 48.0

50 60.8 59.8

65 76.6 75.4

80 89.5 88.1

100 114.9 113.3

125 140.6 138.7

150 166.1 164.1

, I

;1

Table 10: Dimensions for medium and heavy gauge steel tubes to as 1387: 1985 (1990).

Nominal bore (mm)

Uninsulated outside diameter (mm)

219

273

324

356

406

457

508

559

610

660

200

250

300

350

400

450

500

550

600

650

700 711

762

I 813

750

800

Table 11: Dimensions for large bore steel pipes to as 3600 : 1976 (1988).

14

nr .

B1.3 COPPER TUBES 82 TYPICAL VALVE DIMENSIONS Table 13 sets out the range of standard sizes for half hard, half hard and annealed, and hard drawn copper tubes. B2.1 GLOBE VALVES

Table 14 gives typical dimensions of globe valves, flange and screw mountings.

D OPEN

1 f-C---1

Table 13: Dimensions for copper tubes to as 2871 : Part 1 : 1971.

Nominal Pipe bore (mrn)

Typical valve dimensions (mm)

A 8 H C 0 J

10 65 120 50

15 70 140 70

20 85 150 70

25 100 175 85

32 110 200 100

40 120 225 110

50 150 250 120 200 270 180

65 185 280 150 220 300 210

80 210 320 180 240 340 230

100 290 390 260

150 360 510 360

200 500 570 460

For flange diameters refer to Table 12.

Table 14: Typical dimension of globe valves, flange and screw mountings.

Nominal tube size Outside diameter (mm) (mm)

6 6

8 8

10 10

12 12

15 15

18 18

22 22

28 28

35 35

42 42

54 54

67 67

76 76

108 108

133 133

159 159

16 17

I

i

B2.2 GATE VALVES B2.3 DOUBLE REGULATING VALVES Table 15 gives typical dimensions of gate valves, screwed and flange, mounting, rising and non Tables 16 and 17 give typical dimensions of double regulating valves for screwed and flange rising stem type. mounting.

E OPEN

~H

C OPEN

B

l 1---A--I.f--B

Ii

Typical valve dimensions (mm) Nominal Size

(in) A B (open) C (open)

1/ 65 46 892

3/4 78 49 100

1 92 54 114

11/4 114 60 143

11/2 127 60 153

2 146 64 173

Table 16: Typical dimensions for screwed mounting double regulating valves.

Nominal Pipe bore (mm)

Typical valve dimensions (mm)

A B C H D E F

10 55 160 55

15 60 190 70

20 70 220 70

25 75 270 80

32 80 290 90

40 90 350 110

50 140 290 390 210 120 380 140

65 150 320 450 210 120 470 140

80 160 360 490 230 140 620 230

100 180 420 600 260

150 200 540 820 310

200 290 670 1020 360

Table 15: Typical dimensions of gate valves, screwed and flange mounting, rising and non rising stem type.

1918

I

83 THERMAL INSULATION THICKNESSES

. (mm)Nominal Size (mm)

I,

0C·A B (open)(open)

951686413315

Typical valve dimensions Nominal (mm)

Size (mm) A B C 0

(open)

50 230 320 165 165

65 290 377 165 185

80 310 394 190 200

100 350 435 230 220

125 400 505 254 250

150 480 579 305 285

200 600 708 337 340

250 730 839 535 405

300 850 1002 610 460

83.2 LTHW HEATING SYSTEMS 1051877914620

11592 21316225

, 1402389818432 I I

15026711720040

16530612123850

Table 17: Typical dimensions for flange mounting double regulating valves.

:~o

83.1 HOT WATER SUPPLY SYSTEMS

Typical valve dimensions

c

r DT

D

1 ll. JA\ .. A ~I--B

Nominal pipe Insulation thickness (mm)

bore Thermal Conductivity (W/mK) (mm)

Up to 0.025 0.026 - 0.040 0.041 - 0.055 0.056 - 0.070

15 15 25 32 32

20 15 25 32 32

25 15 32 32 32

30 20 32 32 32

40 20 32 32 32

50 20 32 32 38

65 20 32 32 38

80 20 32 50 50

100 20 38 50 50

125 20 50 50 63

150 20 50 63 63 Flat Surfaces

25& Vessels 50 63 75

Table 18: Thermal insulation thicknesses for hot water supplies (Source: as 5422: 1990).

Nominal pipe Insulation thickness (mm)

bore Thermal Conductivity (W/mK) (mm)

Up to 0.025 0.026 - 0.040 0.041 - 0.055 0.056 - 0.070

15 15 25 25 25

20 20 25 25 25

25 20 25 32 32

32 20 25 32 32

40 20 32 32 32

50 20 32 32 32

65 20 32 32 32

80 20 32 32 32

100 25 32 32 38

125 25 32 38 50

150 25 32 50 50

200 25 50 50 50

250 30 50 50 63

300 30 50 50 63 Flat Surfaces 35 50 50 63

Table 19: Thermal insulation thicknesses for LTHW heating systems (Source: as 5422: 1990).

2120

,

83.3 MTHW HEATING SYSTEMS 83.5 CHILLED WATER SYSTEMS

83.4

Nominal pipe Insulation thickness (mm)

bore Thermal Conductivity (W/mK) (mm)

Up to 0.030 0.031 - 0.040 0.041 - 0.055 0.056 - 0.070

15 20 25 32 32 20 20 25 32 32 25 20 32 32 32 32 20 32 32 32

40 20 32 32 32 50 25 32 32 38 65 25 32 32 38

80 25 32 50 50 100 30 38 50 50 125 30 50 50 63 150 35 50 63 63

200 35 50 63 75 250 40 63 63 75

300 40 63 63 75 Flat Surfaces 50 63 63 75

Table 20: Thermal insulation thicknesses for MTHW heating systems (Source: as 5422: 1990).

HTHW AND STEAM HEATING SYSTEMS

Insulat,on thickness (mm) Nominal pipe bore Thermal Conductivity (W/mK) (mm) 0.056 - 0.070 Up to 0.040 0.041 - 0.055

32 32

20 15 32

32 32 32

25 32

32 32 32

50

40

32 38 38 50

50

32 50

65 38 50

63

80

5038 63

100

6350 63

125

6363 75

150

6363 63 100

200 63

100 100

250 75

100 100

300

75 100 10075

Flat Surfaces 10010075

Insulation thickness (mm)

Nominal Pipework within Pipework in floor

building trenches, ducts andpipe bore plantrooms(mm) Thermal Conductivity (W/mK)

0.023 0.040 0.055 0.023 0.040

15 25 38 38 38 50

20 25 38 38 38 50

25 25 38 38 38 50

32 25 38 38 38 50

40 25 38 38 38 50

50 25 38 63 50 75

65 38 63 63 50 75

80 38 63 63 50 75

100 38 63 63 63 100

125 38 63 75 63 100

150 38 63 75 63 100

200 38 63 75 63 100

250 38 63 75 75 114

Above 250 50 75 100 75 114

Flat Surfaces 50 75 100 75 114

Table 22: Thermal insulation thicknesses for chilled water systems (Source: as 5422: 1990).

23

Table 21: Thermal insulation thicknesses for HTHW and steam heating systems (Source: as 5422: 1990).

22

,

83.6 COLD WATER SUPPLY SYSTEMS 84

Insulation thickness (mm)

Nominal pipe Thermal Conductivity (W/mK) bore 0.02 0.04 0.055(mm)

Indoor Outdoor Indoor Outdoor Indoor Outdoor

15 20 25 32 38 50 63

20 20 25 32 38 50 63

25 20 25 32 38 50 63

32 20 25 32 38 50 63

40 20 25 32 38 50 63

50 20 25 25 32 50 50

65 20 25 25 32 38 50

80 20 25 25 25 32 50

Above 80 15 25 19 25 25 32

25 ""

Flat Surfaces 15 25 19 25 32

Table 23: Thermal insulation thicknesses for cold water supply systems (Source: as 5422: 1990).

84.1

84.1.1

I I

!

83.7 REFRIGERANT PIPEWORK SYSTEMS

i!

l ,

:;>'c. ,~

Insulation thickness (mm)

Thermal Conductivity (W/mK) Nominal 0.04pipe bore 0.02 0.03 0.05

(mm) Temperature of Contents °C

-20 -10 0 -20 -10 0 -20 -10 0 -20 -10 0

15 38 32 25 50 38 32 65 50 38 75 63 50

25 38 32 25 63 50 32 65 63 50 90 63 50

50 50 38 32 63 50 38 75 63 50 100 75 63

100 50 50 32 75 63 50 90 75 63 114 90 75

150 63 50 32 75 63 50 100 100 63 114 100 75

250 63 50 38 90 75 50 114 100 63 140 100 75

300-450 63 50 38 100 100 63 140 113 75 150 114 90

Over 450 and Flat Surfaces 75 63 38 114 100 75 140 113 75 175 140 100

Table 24: Thermal insulation thicknesses for refrigerant pipework systems (Source: as 5422: 1990).

24

WORKING SPACE AROUND PIPEWORK

STRAIGHT PIPE RUNS

SCREWED STEEL

Table 25 gives the allowable minimum distances between two uninsulated pipes with standard malleable or cast iron screwed fittings.

The table has been developed on the basis that the minimum distances should be those which will allow free turning of an elbow or tee. ,The values used will therefore depend upon which pipe is installed first. Since turning the fitting on the larger pipe will require more space, a saving can be made if the larger pipe is installed first.

Where the pipework is insulated a minimum separation of 50 mm between external surfaces should be maintained regardless of table 25.

Nom. Minimum pipe distance size from (mm) Wall (A)

(mm) 15 I 20 25

Nominal pipe size, (mm)

32 140 50 65 I 80 100 125

Distance between pipes (B), (mm)

150 I 200

200 216 323 238 241 248 251 257 267 276 289 305 321 356

150 168 187 191 194 200 203 210 219 229 241 260 273

125 146 165 168 171 178 181 187 197 206 219 235

100 124 140 143 146 152 156 165 171 181 197

90 98 117 120 124 130 133 140 149 159

65 86 101 108 111 117 120 127 133

50 73 92 95 98 101 108 114

40 60 79 83 86 92 95

32 54 76 79 83 89

25 48 73 76 79

20 41 70 73

15 38 67

Table 25: Minimum distance allowable between centre lines of uninsulated screwed steel and copper pipes (Source: Institute of Plumbing: 1988).

25

84.1.3 MECHANICAL GROOVED JOINTING TO STEEL PIPES 84.1.2 FLANGED STEEL PIPES

Figure 9 and table 26 show suitable allowances around mechanical grooved jointing toFigure 8 shows suitable allowances around flanged steel pipes. For flange dimensions refer to

steel pipes.table 12. For insulation thicknesses refer to tables 18-24.

50mm

Minimum clearance to

o Figure 9: Space Allowances around mechanical grooved jointing to steel pipes.

wall or other major service

Uninsulated

~1rn 0 9

EJTIM-in-j-m-um'! 100 mm

for access to securing bolts

25mm25mm /

'" ' / '

/ ' / ' r---,--

---~\.... - -

-~----~

,I' ' ;;;;----...:;::- - - - - ,

1 I

/11

1

''I' /.

/ /

<,/

" 'I oI' ,

I

I I I

l -,.!- - - _I ~ - - - - =------'-- - - - ­, /

J

, / , / , /

~inimum Spa;ing to wall or other major service

Insulated (incorporating square insulating flange boxes) Notes: Dimensions have been rounded to nearest 5 mm.

Spacing dimensions S assumes staggered joints. Figure 8 : Space allowances around flanged steel pipes.

Table 26: Space Allowances for uninsulated steel grooved pipe with victaullic joints.

27

l26

I

.[

50 mm clearance between joint

Spacing dimensions S (mm) Dim.

Nominal pipe bore (mm) pipe A c (mm,32 40 100 125 150 60025 50 65 80 200 250 350 400 450 500 550300

115 120 140 155 170 180 405 7525 120 130 135 205 235 260 275 300 325 350 375

125 130 155 165 180 190 41532 130 140 145 220 245 270 285 310 390 85335 360

135 150 155 170 185 195 250 390 41540 130 135 145 220 275 290 315 340 365 85

140 155 160 175 190 200 225 255 280 370 400 42550 135 140 150 295 320 345 95

165 170 185 200 210 235 265 43065 145 150 150 160 290 305 355 380 410 100330m CI)

-EC­ 215190 200 240 270 10580 150 155 155 160 170 175 295 310 335 360 385 410 435'c,

185 190 205 220 230 255 285 310 425 455 125

E 100 165 170 170 180 325 350 375 400

210 220 230 245 255 285 310 425 455 480 150125 190 195 205 335 350 375 400200-e 0 270 295215 225 230 245 255 320 345 415 440 465 490 160150 200 205 210 365 390

..Q

CI) C­ 265 280 290 305 330 450 475 525 220245 250 260 355 400 425 500200 240 240 385 'c,

290 320 330 450 475 525270 270 280 285 305 355 385 410 425 500 550 245250 265'ii c:

275315 320 330 345 360 385 410 455 480290 295 300 305 440 505 530 555 580 0 Z

300'E 375325 325 335 340 350 360 385 410 440 465 480 505 610 305320 530 555 580350

375 385 400 415 490 510 635 330345 350 355 360 370 440 465 535 560 585 610400

375 380 395 405 420 445 475 500 515 615 640 335450 360 360 365 540 565355 590

400 405 420 430 445 470 500 525 540 615 640 665 360380 380 385 390 565 590500

495 525415 425 430 445 455 470 550 565 640 665 690 385550 405 410 410 590 615

495 520 410435 445 450 455 470 485 550 575 590 615 640 665 690 715600 430 435

c .

B4.2 WELDED 45° BRANCHES T1 + --'---- - - - - - - - - - - ­

Tables 27 and 28 show suitable allowances for insulated and uninsulated welded 45° branches -t,---+\----r----~---...---- ­to steel pipes. For insulation thicknesses refer to tables 18 to 24. \

\ \

Uninsulated \

Insulated I,L _

A

B

I I , ,

I

i I r:-- ,;:::ro ,

Table 27: Space allowances for insulated and uninsulated welded 45" branches to steel pipes.

Spacing dimension J (mm)

Nominal pipe bore (mm) pipe run and branch

15 20 25 32 40 50 65 80 100 125 150 200 250 300

15 90 95 95 95 100 100 100 105 110 115 120 130 140 150

c :::J 20 100 100 100 100 105 105 110 110 115 120 125 135 145 155.. Q)Q. 25 105 105 105 105 110 110 115 115 120 130 130 140 155 165 .0.- 32 110 115 115 115 120 120 125 125 130 135 140 150 160 170 c Q) u 40 120 125 125 125 130 130 130 135 140 145 150 160 170 180 CIS :go

CIS 50 135 135 135 140 140 140 145 150 150 155 160 170 185 195 -E 160 165 170 175 180 190 190 210 E 65 150 150 155 155 155 160 -Q) 180 185 190 195.. 80 170 170 170 175 175 180 200 210 220 230 0 .c 100 195 195 200 200 200 200 205 210 210 215 220 235 245 255 Q) Q..0. 125 225 225 230 230 230 230 235 240 240 245 255 265 275 285

co c 150 255 255 260 260 260 260 265 270 270 280 285 ,295 305 315

"e 0 200 315 315 320 320 320 320 325 330 335 340 345 355 365 375 Z

250 375 375 380 380 380 385 385 390 395 400 405 415 425 435

Notes: For Insulated pipes add appropriate insulation thickness from tables 18 to 24. For values of J refer to table 27.

Table 28: Space allowances for equal size 45" branch take - offs to welded steel pipes.

J

J

Nominal bore of pipe and

branch (mm)

Uninsulated

A (mm) B(mm)

25 75 45

32 95 50

40 110 60

50 130 70

65 160 85

80 185 95

100 235 120

125 285 145

150 315 150

200 435 215

250 540 265

300 640 315

350 710 355

400 800 395

2928

-------------

B4.3 SCREWED 45° BRANCHES B4.3.2 UNEQUAL SIZE SCREWED 45° BRANCHES

Table 30 shows suitable allowances for uninsulated screwed 45° branches of different sizl' 10

B4.3.1 EQUAL SIZE SCREWED 45° BRANCHES through pipe.

Table 29 shows suitable allowances for insulated and uninsulated screwed 45° branches to steel pipes.

Insulated

A

..... __ ...­

.... ....

.... '-/ Insulation , , ,

'L _

T1 • ? - - ..... ..,------~_ ,. ' ,, '

I "

I " I ' •

\ ,, \

I I

B

Nominal bore of branch

Uninsulated

and pipe run (mm) A (mm) B{mm)

10

15 55 35

20 65 40

25 80 45

32 100 55

40 110 65

50 135 75

65 170 90

80 195 105

100 250 130

i I i i

Notes: For insulated pipes add appropriate insulation thickness from tables 18 to 24. For values of J refer to table 27.

Table 29: Space allowances for insulated and uninsulated screwed 4SO equal size branches to steel pipe.

D

Dimensions D and E represent minimum projections for 45° pipework branch

E

Table 30: Space allowances for unequal size screwed 45° branches.

Nominal bore of branch pipework (mm) --­

Nominal 80 65 50 40 32 25 20 bore of

through pipe Spacing dimensions (mm) (mm) ".~,,.,~

D E D E D E D E D E D E D E

100 215 125 200 125 180 120 170 120 160 120 150 115 -,

80 180 100 160 100 145 100 140 95 125 95 120 95

65 145 85 135 85 125 85 115 80 110 60 --­

50 120 70 115 70 100 65 95 70 '.

40 105 60 90 55 85 60 ..

32 85 50 80 55 -­

25 70 45

30 31

p~ ,

r , 1;»+

84.4 WELDED PIPE Fln"INGS Table 31 continued... Table 31 shows suitable allowances for a range of welded fittings. REDUCING TEE ECCENTRIC REDUCER COI\ICENTRIC REDUCER

ELBOW RETURN BEND

45°

0

r

JK

i-=c-+-c=1 .fH

Nominal Outside 45° Elbows 90° Elbows 180° Return Bends

Long Radius Pipe Size

(mm) Diameter

(mm) B

(mm) A

(mm) K (mm)

0 (mm)

15 21.3 11.1 38.1 49.20 76.2

20 26.9 11.1 38.1 52.37 76.2

25 33.7 22.2 38.1 55.55 76.2

32 42.4 25.4 47.6, 69.85 95.25

40 48.3 28.6 57.1 82.55 114.3

50 60.3 34.9 76.2 106.35 152.4

65 76.2 44.4 95.2 133.35 190.5

80 88.9 50.8 114.3 158.75 228.6

90 101.6 57.1 133.3 184.15 266.7

100 114.3 63.5 152.4 209.55 304.8

125 139.7 79.4 190.5 260.35 381.0

150 165.1 95.2 228.6 311.15 457.2

150 168.3 95.2 228.6 312.72 457.2

175 193.7 111.1 266.7 ---­ ---­200 219.1 127.0 304.8 ---­ ---­225 244.5 142.9 342.9 ---­ ---­

250 273.0 158.7 381.0 ---­ ---­300 323.9 190.5 457.2 ---­ ---­

350 355.6 222.2 533.4 ---­ ---­400 406.4 254.0 609.6 ---­ ---­

Nominal Pipe Sizes H C M

(mm) (mm) (mm) (mm)

20 x 15 38.1 ---­ ---­25 x 15 50.8 ---­ ---­

20 50.8 ---­ ---­32 x 15 50.8 ---­ ---­

20 50.8 ---­ ---­25 50.8 ---­ ---­

40 x 15 63.5 ---­ ---­20 63.5 ---­ ---­25 63.5 ---­ ---­32 63.5 ---­ ---­

50 x 15 76.2 ---­ ---­20 76.2 ---­ ---­25 76.2 63.5 50.8 32 76.2 63.5 57.1 40 76.2 63.5 60.5

65 x20 88.9 ---­ ---­25 88.9 ---­ ---­32 88.9. ---­ ---­40 88.9 76.2 66.7 50 88.9 76.2 69.8

80x25 88.9 85.7 66.7 32 88.9 85.7 69.8 40 88.9 85.7 73.0 50 88.9 85.7 76.2 65 88.9 85.7 82.5

100 x 40 101.6 104.7 85.72 50 101.6 104.7 88.9 65 101.6 104.7 95.2 80 110.6 104.7 98.3

125 x 65 127.0 ---­ ---­80 127.0 123.8 111.1

100 127.0 123.8 117.5

Nominal Pipe Sizes H C M

(mm) (mm) (mm) (mm)

150 x 50 139.7 142.8 117.5 65 139.7 142.8 120.6 80 139.7 142.8 123.8

100 139.7 142.8 130.2 125 139.7 142.8 136.5

200 x 80 152.4 177.8 152.4 100 152.4 177.8 155.6 125 152.4 177.8 161.9 150 152.4 177.8 168.3

250 x 100 177.8 215.9 184.1 150 177.8 215.9 193.7 200 177.8 215.9 203.2

300 x 150 203.2 254.0 219.1 200 203.2 254.0 228.6 250 203.2 254.0 241.3

350 x 200 330.2 279.4 247.6 250 330.2 279.4 257.2 300 330.2 279.4 269.9

400 x 200 355.6 304.8 273.0 250 355.6 304.8 282.6 300 355.6 304.8 295.3 350 355.6 304.8 304.8

Table 31: Dimensions for welded fittings.

Table 31: Dimensions for welded fittings.

32 33

---- ----

----

---- ---- ----

---- ---- ----

----

----

---- ---- ----

---- ---- ----

---- ---- ----

Table 31 continued... 84.5 SCREWED PIPE FITTINGS Table 32 shows suitable allowances for a range of screwed steel pipe fittings.

BRANCH BEND EQUAL TEE CAP

r- E --J I I I I I

I

I

I I I

90° Elbows Short Radius

A (mm)

H (mm)

E (mm)

CandM (mm)

25.4

25.4

25.4 38.1 38.1

31.75 38.1 47.62

38.1 34.92 38.1 57.15

50.8 44.45 38.1 63.5

63.5 57.15 38.1 76.2

76.2 69.85 50.8 85.72

76.2

101.6 88.9 63.5 104.77

127.0 114.3 76.2 123.82

152.4 133.3 88.9 142.87

152.4 113.3 88.9 142.87

152.4

203.2 177.8 101.6 177.8

196.8

254.0 228.6 127.0 215.9

304.8 266.7 152.4 254.0

355.6 330.2 165.1 279.4

406.4 368.3 177.8 304.8

Note: All dimensions have been rounded to nearest 5 mm. Table 31: Dimensions for welded fittings.

Table 32: Standard fittings for screwed steel pipework to as 143: 1986 and as 1256 : 1968.

3534

T

-v '- - ~ " ..-- - ­,hl

R

\ ' (

I83· TR

ffi33 hl

R T U V wS

e : ~ ~ ,~ LtP ~ ICRl Nominal V WT UR Spipe bore (mm) (mm)(mm) (mm)(mm)(mm)(mm)

45 70

25

55 7020 40 30

50 85

32

65 9045 35

65 105

40

80 1104050

120

50

70120904560

85 140

65

14511070 60

105 160

80

125 1807085

120 185

100

140 21595 80

150 220

125

180 270120 95

210 320

150

140 115

210250 380130165

84.6 MECHANICAL GROOVED PIPE FITTINGS Table 33 shows suitable allowances for a range of steel pipe fittings for use with a mechanical

PARTC grooved jointing system. ALLOWANCES FOR ELECTRICAL INSTALLATIONS

i

i !

I~

Ef E

·I~ E

~I

~. I~

Er~ <?F~

C1

C1.1

PVC-INSULATED CABLES

CA8LES WITH COPPER CONDUCTORS Table 34 gives dimensional data for 60011000 Volt PVC-insulated cables with copper conductors.

EQUAL TEE 900 ELBOW 450 ELBOW

Pipe size

E (mm)

F (mm)

Nominal bore (mm)

Overall diameter (mm)

25 33.4 57 44.5

32 42.2 70 44.5

40 48.3 70 44.5

50 60.3 82.5 51

80 88.9 108 57

100 114.3 127 76

150 165.1 165 89

150 168.3 165 89

200 219.1 197 108

I i

i I

Table 33: Fittings for screwed steel pipework with mechanical grooved jointing system.

I I

Nominal Unarmoured Cables Armoured Cables cross

sectional Approx Minimum Approx Minimum area of overall cable internal overall cable internal

conductor diameter bending diameter bending(mm2) (mm) radius (mm) (mm) radius (mm)

50 15 120 19 152 70 17 136 21 168 95 19 152 23 184

120 21 168 26 208 Q) 150 23 184 28 224.. 0 185 26 208 31 248u Q) 240 29 232 34 272til 300 32 256 37 296c en 400 36 288 42 336

500 40 320 46 368 630 44 352 50 400 800 48 384 56 448

1000 54 432 61 488

1.5· ---­ ---.. 12 72 1.5 + ---. ---­ 12 72 2.5 • .._... ­ ---­ 13 78 2.5 + ---­ ---­ 14 84

4 • ---­ _.._­ 15 90 6+ ---­ ---­ 17 102

10 + 16 128 20 120 16 + 19 152 22 176

Q) 25 ++ 18 144 23 184.. 0 25 + 22 176 27 200u 0 35 ++ 20 160 25 216 ~ 35 + 25 200 30 240

50 # 23 184 28 224 70 26 208 30 240 95 29 232 36 288

120 32 256 38 304 150 35 280 41 328 185 39 312 46 368 240 44 352 51 408 300 49 392 56 446 400 54 432 62 496

Table 34: Dimensional data for cables with copper conductors to as 6346 : 1989.

Note: All conductors unless otherwise stated, are standard copper conductors.

37

'i 84.7 VALVES AND FLOW MEASUREMENT DEVICES

84.7.1 VALVES Adequate space is necessary, not just for installation but also to permit access and maintenance.

A clear height of 150 mm above valves up to 50 mm in size and 250 mm for valves greater than 50 mm should be allowed.

84.7.2 FLOW MEASUREMENT DEVICES At least 100 mm clearance from pressure test points must be allowed to enable manometer tubes to be connected without kinking.

36

. ~jtl"ir"~='}==:;;----_iiiiiiiiiiiiiiiil.... _- . ,ltd

-------- ----

----

---- -------- ----

----

r

Table 34 continued...

.",,- . - ._--

Unarmoured Cables Armoufacl Cnblcn' Nominal

~.-

cross sectional Approx Minimum area of

Minimum APr,rmcoverall cable Intarnnl

conductor internal ovorn I o"bl~

diameter dlntn~t.r banding (mm2)

bending (mm) rndlu. (mm)radius (mm) (mm)

....._­..-..... t ~J1.5 * /2 1.5+ ......... /(I1:1 2.5* 14 114 2.5+ ........ ­ -...... ­ flII14

.........4+ --- .. 110 6+

In ... _-­ -....... tonIII

10+ 17 136 12B21 16+ '):1160 11\420CD... 25++ ')110 20 160 ~OO

U 25+ 192 1'./124 ~~4CD CD 35++ 22 176 ~16U... J:: 35+ 20826 ~46:III ­

50# 26 208 :11 248 70 23229 2BO 95

:Ib 264 at233 :m 288120 36 336

150 42

40 320 3644O 45 360 416

240 185 ~2

40050 404 300

nO 448 FlO4

400 56 03

(jOO49662 70 ... . ­

-_.... .. - ... 001.5 * 521:1 1.5 + ...--.. 6014

-_.... --....2.5 * 00 2.5+

11l 00

4+ In

72In 6+ ---.. III '10

10+ 152 02 16 +

19 1'.:1 17622 ~IO1'.7

CD... 25++ 2(123 184 2240 u 25+ 208 241126 at... ~ 35++ 200 24025 :110 35+LL 232 212

50# 29 :14

200 70

23229 :111 :1 t2 264 :m33 :1112

120 95 30438 4"

;]fJ2 150 368 ""33642

(i446 4:12 185 40851 60 472 240 464 0058 ';28 300 fi1665 520 72

(\4072 576 8t400

Table 34: Dimensional data for cables with copper conductol'S to ns 0346 : 1989.

Note: All conductors unless otherwise stated, are standard COppl'I' l'OIIlIIll'tOI'N.

38

Table 34 continued...

Nominal Unarmoured Cables Armoured Cables cross

sectional area of

conductor (mm2)

Approx overall cable

diameter (mm)

Minimum internal bending

radius (mm)

Approx overall cable

diameter (mm)

Minimum internal bending

radius (mm)

-a;...-~ CD c

"C CD u ~

"C CD...-CD... 0 u ... ~ 0

LL

25 25+ 35 35+ 50 70 95

120 150 185 240 300 300 400

23 25 25 27 28 32 38 41 45 50 56 62 64 70

184 200 200 216 224 256 304 328 360 400 448 496 512 560

28 30 30 32 33 38 44 49 52 57 64 70 72 79

224 240 240 256 264 304 352 392 416 456 512 560 576 632

Table 34: Dimensional data for cables with copper conductors to as 6346: 1989.

Note: All conductors unless otherwise stated, are standard copper conductors.

Legend:

Circular solid conductors (class 1).

+ Circular or circular compacted stranded conductors (class 2).

++ Shaped stranded conductors (class 2).

# Cables having conductors of nominal cross-sectional area 50 mm2 and above have shaped stranded conductors (class 2).

39

CABLES WITH SOLID ALUMINIUM CONDUCTORS C1.2 Table 35 gives dimensional data for 600/1 000 Volt I'V(:- insllhll·d ca hies wil II solid a11IIllinium

conductors.

Armourod Coblos Unarmoured Cables -_.~----Nominal

cross IMinimum Strip olumlnlum MinimumSteel wire MinimumApprox Internalopproxsectional approx Internolinternaloverall ovornll coble bendingoverall cablo bondingarea of bendingcable radiusdlnmoterdiameter radiusconductor radiusdiameter (mm)(Illm)(mm)(mm)(mm2) (mm)(mm) 136II11\1\1811214 14450 III1002012015 16070 :-'0IlllGI 22... 14418 ~J(J 17695 ;'>000 24152C) 19 192120 ~~4;'>01126GI 16821 216150 :-'.1;.>;.>1\m 2818423c: 240185 :10:-'.I\n3120826iii 264240 :1:12l:-' _______..J3423229 296

300 :IfaOI\38256co 32 328380 1\1:I:lll4228836 344Go- 480 1\:1ool!! :lliO45312ucu.9 39 376UlU 600 1\71\0050Gl 336-'-::> 42 432740 fil\1\1\0cnca-a 55376c::; c: 47 464960 fin1\00.- U 0 60416 .­tJJ.~ u 52 ._... ­1200.e. 152tilHIli2113617 15216· til100211361725+ 184;>:1"002516020 16825­GI ;>11111\... 231441835+0 200(,!i21!i27U 17622 18435­ 232000 261602050++ 208;.>U221\28~ 18423 24070 :1025U32 .-.__ ..2082695

168~). 11102214418 1762216 ­ 102241521925 + 192;>1\2002617622 184;.>:125 ­ 20/l261682135 + 2082023229192GI 24 216(l735 ­... 232291920 50 ++ 24 240:10u 2UI\3321627 28070GI :1520U3724831l!! 30495 :1032040.c 27234 328120 1\1l ­ 3004529637 360150 1\".13U24933641 408185 !il1\325437647 448240 rin1\725941652 .....300 176222002516020 192(11\16 ­ 200261762225 + 208('02322919224 2082U25 ­ 232291922435 + 2322021\£131208GI 26 248... :1135 ­ 261\330 2162750 ++ 27231\C) 2963724831 31270 :m328~ 41288360 34495 1\336846LL 31239 376120 1\74005034443 416150 524405537647 464185 584886143254 512240 61\5366748060300

Table 35: Dimensional data for cables with solid aluminium conductors

to BS 6346 : 1989.

Legend:

*

+

++

Circular solid conductors (Class 1).

Shaped solid conductors (Class 1).

Cables having conductors of nominal cross sectional area 50 mm2 and above have

shaped solid conductors (Class 1).

40

C2 IMPREGNATED PAPER-INSULATED CABLES

C2.1 CABLES WITH STRANDED COPPER OR SOLID ALUMINIUM CONDUCTORS Table 36 gives ba~ic dimensions and bending radii for 600/1000 volt im re nated -lOsulated cables with stranded copper or solid aluminium conductors. p g paper

Nominal Unarmoured Steel Wire Armoured

conductor PVC sheath Minimum PVC bedded area

Minimum

(mm2) approx. internal and sheathed internal

overall dia. bending radius approx. overall (mm)

bending radius (mm) dia. (mm) (mm)

50 17 204 70 19

---­ ---­228

95 21 -- .. ­ ---­

120 252 ---­ ---­

23 276 l!! 150 24

"Oo"­ ---­288

0 185 27 ---­ ---­

u 324 GI 240 30

---­ ---­m 300

360 ---­ ---­c: 32 384 iii 400

---­ ..--­36 432

500 40 ---­ ---­

480 630 44

---­ ---­

800 528 ---­ ---­

49 588 1000

---­ ---­54 648 ---­ ---­

4 14 168 6

18 216 16 192

10 20 240

17 204 16

22 264 17 204

25 22 264

19 228 35

25 300 21 252

GI 50 27 324 ... 23

0 276 29 u 70 26

348

0 95 312 33 396

~ 28 336 36

120 31 432

372 39 150 35

468

185 420 43 516

38 456 46 240

552 42 504 51

300 612

46 552 56 400 52

672 624 61 732

4 15 180 19 6

228 16 192 21

10 18 252

216 23 16 18

276

25 216 24 288

21 252 f 35 23

27 324

0 50 276 29 348

u 26 312 3l 70 29

31 372

.. 95 348 36 432

.c 32 384... 120 39 468

35 420 150 39

43 516

185 468 48 576

43 240

516 52 624 48

300 576 58 696

53 636 62 400 59

744 708 68 816

Table 36: Basic dimensions and bending radii for 60011000 volt cables 'th stranded copper or solid aluminium conductors to BS 6480 : ~88.

41

-------- -------- ------------

----

C2.2 CABLES WITH SOLID ALUMINIUM OR SOLID COPPER CONDUCTORS Table 36 continued...

Table 37 shows basic dimensions and bending radius for 60011000 volt impregnated paper­insulated with solid aluminium or solid copper conductors.

Unarmoured Steel Wire Armoured

Nominal PVC bedded Minimumconductor PVC sheath Minimum

area approx. internal and sheathed internal

(mm2) overall dia. bending radius approx overall bending radius

(mm) (mm) dia. (mm) (mm)

4 16 192 20 240

6 17 204 22 264

10 20 240 25 300

16 20 240 26 312

25 24 288 29 348

35 26 312 32 384

Ql 50 29 348 36 432

0 70 33 396 40 480 u.. 95 37 444 44 528 j 5880 120 41 492 49 IL 54 648

150 45 540 185 50 600 59 708

240 56 672 65 780

300 62 744 71 852

400 69 828 79 948

25 23 276 29 348

35 25 300 31 372

50 28 336 35 420

.c'iii 70 32 384 39 468 ~'$ 95 36 432 44 528 :=Ql ~z 120 40 480 49 588

O't:l 150 44 528 52 624 OQl .. u 185 48 576 57 684 jj 756o't:l 240 54 648 63 IL Ql 828

l:C 300 59 708 69

300 61 732 71 852

400 66 792 77 924

25 25 300 31 372

35 28 336 35 420

't:l .. 50 30 360 38 456 1: 0 504

.c lll

- 70 35 420 42 _-u 576 .- III j 95 39 468 48 :=:::'t:l 624Qljl: 120 43 516 52 .. QlO 672 ozo 150 47 564 56 0't:l ­ 50 600 59 708 Ql Ql.!!! 185>uu

240 51 612 61 732 . ­ j Ql1L't:l Q.

58 696 67 804 Qlen 300l:C

300 63 756 73 876

400 64 768 75 900

Table 36: Basic dimensions and bending radius for 600/1000 volt cables with stranded copper or solid aluminium conductors to BS 6480 : 1988.

42

Steel Wire Armoured Nominal

conductor

Unarmoured

PVC beddedMinimumPVC sheath Minimum area and sheathed internalapprox. internal

(mm2) approx overall bending radius bending radius (mm)

overall dia. dia. (mm) (mm) (mm)

380 32 .. ---­384 GI 480 36 432 0 600 39 468 Ql .--­° 740 43 516m I: .--­960 48 576in 1200 .--­52 624

4 14 18 216 6

168 15 22819180Ql.. 252

16 10 16 211920

27618 232160 ° 25 28818 24216~

288 50

1935 24228 31220 26240

4 14 228 6

19168 16 240

10 20192

17 252 16

21204 300

25 19 25228

31220 26240..GI35 22 27 324 50

2640 24 36030288° 3l.. 70 40827 34324 .c

I ­ 95 30 444 120

37360 480

150 33 40396

540 185

37 45444 588

240 40 49480

648 300

45 54540 69649 58588

240 6

15 204 180 252

10 17 21204

288 16

19 24228 312

25 21 26252

33622 28264 ..GI 360 50 35 24 30288

4083427 334°.. 0

j 70 45630 383600IL 504

120 95 34 42408

552 150

38 46456 612

185 42 51504

660 240

46 55552 732

300 52 61624

79257 66684

Table 37: Basic dimensions and bending radius for solid aluminium or solid copper conductors to BS 6480: 1988.

43

r C4 CABLE TRUNKINGC3 CABLE TRAY

C4.1 STEEL SURFACE TRUNKING C3.1 STEEL TRAYS Table 40 gives maximum external dimensions for steel surface trunking. Table 38 gives typical dimensions for steel cable trays.

w f (mm) (mm)

50 15 75 15

100 15 150 15 230 15 300 20 450 20 600 20 760 20 900 20

~ f

t

Nominal size (mm)

50 x 37.5

*50 x50

*75 x50

*75 x75

100x50

*100 x 75

*100 x 100

150 x50

150 x 75

*150 x 100

*150 x 150

Table 38: Typical dimensions for steel cable trays.

Maximum external dimensions (mm)

52.5 x 39.5

52.5 x 52.5

79.0 x 52.5

79.0 x 79.0

105.0 x 52.5

105.0 x 79.0

105.0 x 105.0

157.5 x 52.5

157.5 x 79.0

157.5 x 105.0

157.5 x 157.5

Preferred length 3m, minimum 2m, maximum 3m.

* Preferred sizes C3.2 STAND OFF BRACKETS Table 39 gives dimensions for typical brackets Table 40: Maximum external dimensions for steel surface trunking to

as 4678: Part 1 : 1971 (1988).

C4.2 STEEL UNDERFLOOR (DUCT) TRUNKING Table 41 gives preferred dimensions for underfloor trunking.

A B C (mm) (mm) (mm)

76 25 75 102 25 75 152 50 100 230 50 100 305 75 125 381 75 125 457 75 125 533 75 125 610 75 125

External dimensions excluding flange projection (mm) Number of

compartmentsWidth Depth

75±4 75±4

25 ±1.2 37.5 ±2

One One

100 ± 5 100± 5

25 ±1.2 37.5 ±2

One or two One or two

150±7.5 150 ± 7.5 150 ± 7.5 150 ± 7.5

25 ± 1.2 37.5±2

25 ± 1.2 37.5± 2

Two or three Two or three One One

225 ± 11.2 225 ± 11.2 225 ± 11.2 225 ± 11.2

25 ± 1.2 37.5± 2

25 ± 1.2 37.5±2

Three Three Two Two

Preferred lengths 3m, minimum 2m, maximum 3m. Table 39: Typical dimensions for stand off brackets.

Table 41: Preferred dimensions for underfloor trunking to as 4678 : Part 2: 1973 (1985).

4544

C5 CONDUIT SADDLES C5.2 SPACER BAR SADDLES Table 43 gives dimensional data for spacer bar saddles.

C5.1 SADDLES Table 42 gives dimensional data for conduit saddles.

Spacer Bar Saddle All dimensions are in millimetres

Nominal size

16

20

25

32

Saddle All dimensions are in millimetres

A

min.

50.0

55.0

61.0

73.0

B

min.

16

19

19

25

min.

16.0

20.0

25.0

32.0

C

max.

16.4 ..

20.4 •.. ~-~

25.4

32.4

0

nom.

33

30

015

53

Nominal size

16

20

25

32

A

min.

50.0

55.0

61.0

73.0

B

min.

16

19

19

25

C 0

min. max. nom.

16.0 16.4 33.0

20.0 20.4 39.0

25.0 25.4 45.0

32.0 32.4 53.0

Table 43: Dimensional data for spacer bar saddles to as 4568: Part 2: 1970 (1988).

Table 42: Dimensional data for saddles to as 4568 : Part 2: 1970 (1988).

46 47

_: :::::': ------ ................=­.::;.::!##_••••••••••••••••••••••• ..------I!IIIIII!IIIIIIIIIIIIIIIIIIIIIIII~~!!!""""!!!""""...,.., ,

C5.3 DISTANCE SADDLES Table 44 gives dimensional data for distance saddles. C6 STEEL CONDUIT

-A-----1

Distance saddle All dimensions are in millimetres

Nominal size

A

min.

B

min. min.

C

max.

D

min.

E

nominal

16 41 13 16.0 16.4 29 14

20 49 16 20.0 20.4 36 16

25 52 16 25.0 25.4 40 19

32 69 19 32.0 32.4 46 22

Table 44: Dimensional data for distance saddles to as 4568 : Part 2 : 1970 (1988).

48

C6.1 STANDARD CONDUIT SIZES Table 45 sets out the range of dimensions of standard conduit for heavy and light gauge steel.

Heavy gauge Light gauge

BA A BNominal diameter

(mm) min. max. nominal nominalmin. max.

15.716 16.0 1.6 15.7 16.0 1.0

19.720 20.0 1.6 19.7 20.0 1.0

24.625 25.0 1.8 24.6 25.0 1.2

31.632 32.0 1.8 31.6 32.0 1.2

Table 45: Dimensions of standard conduit for heavy and light gauge steel to as 4568 : Part 1 : 1970.

C6.2 STANDARD LONG RADIUS BEND Table 46 gives dimensions of standard long radius bend for steel conduit.

I I

~--

Nominal Min. inner diameter radius R

(mm) (mm)

16 40

20 50

25 62.5

32 80

Table 46: Dimensions of standard long radius bend for steel conduit to as 4568 : Part 1 : 1970.

49

C7 CONDUIT - BOXES C7.2 STANDARD DEEP BOXES Table 48 sets out the range for malleable cast iron and steel standard deep conduit boxes.

C7.1 STANDARD BOXES Table 47 sets out the range of standard sizes for malleable cast iron and steel conduit boxes.

A

Standard deep boxes

Nominal A B min (mm) D size approx min

(mm) (mm) malleable steel (mm) cast iron

20 62 23.2 21.5 19.0

25 65 28.4 26.7 22.0

32 67 36.8 33.8 24.0

Table 48: Dimensional data for standard deep conduit boxes to as 4568: Part 2: 1970 (1988).

Standard boxes

Nominal A B min (mm) D size approx min

(mm) (mm) malleable steel (mm)

cast iron

16 50.0 19.2 17.5 17.5

20 51.5 23.2 21.5 19.0

25 54.5 28.4 26.7 22.0

Table 47: Dimensional data for standard conduit boxes to as 4568 : Part 2 : 1970 (1988).

5150

C8.2 CABLE-CLEATSWORKING SPACE AROUND ELECTRICAL SERVICES C8

C8.2.1 CLAW TYPE C8.1 CABLE-HANGERS Table 50 gives minimum cable spacing when using claw type cable cleats. All dimensions given

Table 49 shows basic overall dimensions of cable hangers suitable for cables from 50 have been rounded to the nearest 5 mm. mm outside diameter up to 100 mm outside diameter. All dimensions have been rounded

up to the nearest 5 mm.

f->-­I

CIQ:~:t==:==:::::::=:i

~ 1__ A_-_~

Wall, steelwork or adjoining services

Wall, steelwork or adjoining services

A

I

+c

Cables up to Cables 50mm Cables 76mm Number 50mmO.0 to 75mm 0.0. to 100mm 0.0.

of ways A C E A C E A C E

(mm) (mm) (mm) (mm) (mm) (mm) (mm) (mm) (mm)

1 160 40 90 165 50 125 195 65 160

2 250 40 90 290 50 125 355 65 160

3 335 40 90 420 50 125 515 65 160

4 425 40 90 545 50 125 675 65 160

5 515 40 90 675 50 125 830 65 160

6 605 40 90 800 50 125 990 65 160

Table 49: Basic overall dimensions of cable hangers.

Overall Cleat dimensions Minimum dimension between adjoining

cable centres 0 (mm)

Mimimum dimension cable centre line

to wall E (mm)

diameter of cable

(mm) A

(mm) B

(mm) C

(mm)

15 40 35 45 45 25 III- 20 40 35 45 45 25 I'CI Gl 0

20 25 30

45 50 55

45 45 45

45 45 45

50 55 55

25 30 30

==I'CI 0 40

45 60 65

60 60

45 45

65 70

35 40

50 75 75 45 80 40

55 100 80 50 105 55

III-I'CI

65 70

100 135

85 100

50 65

105 140

55 75

Gl U-"0 ..c

75 85 90

135 140 140

100 115 115

65 65 65

140 145 145

75 75 75

I

0 95 150 135 75 155 80 ~ 100 150 135 75 155 80

110 165 150 75 170 90 115 165 150 75 170 90

Table 50: Minimum cable spacing when using claw type cable cleats.

5352

,",_...L.~ J.....I _

C8.2.2 CLAMP TYPE (1) Tables 51 and 52 give minimum cable spacing when using clamp type cable cleats. All dimensions have been rounded to the nearest 5 mm.

Wall, steelwork or adjoining service

Wall, steelwork or adjoining service - r-- c-----j

{tj. -T"F~

G

JG 1

A (mm)

C (mm)

F (mm)

G (mm)'

H (mm)

13 16 18 21 23 26 32 36 41 47 51

20 20 20 25 30 30 40 45 50 55 60

25 25 30 35 35 40 50 60 65 75 75

30 30 35 40 40 45 55 65 70 80 80

20 25 25 25 25 30 30 35 35 40 40

Hook cleat details

Overall cable diameter

A (mm)

B (mm)

D (mm)

G (mm)

H (mm)

16 50 20 55 40 19 55 20 60 40 22 55 25 60 40 25 60 25 65 40 32 75 30 80 45 38 80 30 85 45 44 85 35 90 45 51 95 40 100 45 57 105 45 110 50 64 110 45 115 50 70 120 50 125 55 76 130 55 135 60

Table 51: Minimum cable spacing when using clamp type. Table 52: Dimensional details for hook cleat.

1 54 55

1

---c-------­ .. I

r

Two bolt fixingC8.2.3 CLAMP TYPE (2)

Tables 53 and 54 give minimum spacing between cable runs to waH or other fixtures when using single bolt and two bolt fixings.

Single bolt fixing

Wall, steelwork or adjoining services Wall, steelwork or

adjoining services

Overall diameter A of cables

accommodated

Cleat dimensions

Single-bolt fixing

Centres between adjoining

cleats

E (mm)

.Centre of cleat to

adjoining well, etc.

F (mm)

max (mm)

B (mm)

C (mm)

38 83 75 80 45 40 85 90 90 50 41 90 90 95· 50 43 90 90 95 50 44 90 90 95 50 46 95 90 95 50 48 95 90 95 50 49 95 90 95 50 51 100 90 95 50 53 100 90 95 50 54 100 90 95 50 56 105 90 95 50 57 105 90 95 50 59 110 90 95 50 60 115 90 95 50 62 115 90 95 50 64 115 90 95 50 65 120 90 100 55 67 120 90 100 55 68 120 90 100 55 70 125 90 100 55 71 125 100 105 55 73 125 100 105 55 75 130 100 105 55 76 130 100 105 55

Overall Cleat dimensions Centres Centre of diameter A between cleat to of cables adjoining adjoining

accommodated Two-bolt fixing cleats well, etc.

max B C E F(mm) (mm) (mm) (mm) (mm)

38 80 120 125 6540 85 145 150 8041 90 145 150 8043 90 145 150 8044 90 145 150 8046 95 145 150 8048 95 145 150 8049 95 145 150 8051 100 145 150 8053 100 145 150 8054 100 145 150 8056 105 145 150 8057 105 145 150 8059 105 145 150 8060 110 145 150 8062 110 145 150 8064 110 145 150 8065 115 150 160 8067 115 150 160 8068 115 150 160 8070 115 150 160 8071 120 160 165 8573 120 160 165 8575 120 160 165 8576 120 160 165 85

Table 54: Minimum spacings for two bolt fixings. Table 53: Minimum spacings for single bolt fixing.

56 57

C8.3 STEEL CONDUIT C8.2.4 MULTI-CABLE Table 56 gives the minimum spacing required between conduits and adjoining services. All dimensions have been rounded to the nearest 5 mm. The spacing between conduits will permit sufficient space for inspection couplers. Additional space will be required if adaptable boxes or circular boxes are included in the conduit run. The dimensions given assume the use of spacer bar saddles. If adjoining services are a heat source the dimension B has to be increased.

Table 55 gives minimum spacing between cable runs to wall or other fixtures.

Spacing to wall or other

major service

I· D-----+-E

Wall, steelwork or adjoining major service

Wall, steelwork or adjoining major service

Centre of CentresCleat dimensions Overall cleat to betweendiameter A

adjoiningadjoiningof cables well, etc. cleatsSingle-bolt fixing Two-bolt fixing accommodated

EDCE·CBmax (mm)'(mm)(mm)(mm)(mm)(mm)(mm)

7013513075 9525 95 70135130957527 95 7013513075 10028 100 701351301057510530 701401351058032 105 70140135105105 8534 75140110 135110 8535 75145140115115 9036 751451401159011538 801501451209540 120 8015014512010041 120 8015515012510512543 8015515012511012544 8016015513011013046 8516015513511513048 85165160120 13513549 90170140 16512014051 9017016514512514553 90175170145145 12554 9519018515513515556

100190185160160 13557 100195190160160 14059 100195190165165 14560 100200195165165 15062 105200195170170 15064 105205200170170 15565 105205200175175 16067 110210205180180 16568 11021521018017018570 115220215185 ' 170 18572 11522021519017519073 115225220180 19519575 115230220185 20020076

Nominal diameter

(mm)

Spacing dimension A

Adjacent conduit nominal diameter (mm)

Spacing dimension

B To adjacent

steelwork, wall, services, etc.

Spacing dimension

C Approx

maximum projection

16 20 25 32

16 35 40 40 45 30 20 20 40 45 50 30 25 25 50 50 35 30 32 55 40 40

Table 56: Minimum spacing between conduits and adjoining services.

C8.4 STEEL -rRUNKING Figure 10 shows access space required around steel trunking.

Access Space

I I I I I I I L .L-__-----'I

f--150 mm----j

Figure 10: Access space around trunking.

Table 55: Minimum spacing between cable runs and cable runs to wall or other fixtures.

58 59

[ .....1....--... _

\

02 ANTHROPOMETRICPARTD Figures 11, 12 and 13 show the working space required for carrying out different activities.

GENERAL DATA Prone Kneel 1.1 m

01 ISO METRIC BOLT POSITIONING 2.5m Table 57 shows the working space required round ISO metric bolts.

450mm 1.4 m1------A-------,

Crawl 1.5 m Maintenance reach levels

Stand l'·5m790mm

Kneel

600mmSit690mmSquat

300mm

Iso-Metric bolt dia.

Dim. A1F

(mm)

Min. dim for depth E

(mm) Min. dist.

(mm)

Min. centres between

equal bolts (mm)

Min. dist (mm)

Max depth for 60° turn

(mm)

,

A B C D E

M4 7 53 10 17 8 32

M5 8 57 12 18 10 35

M6 10 72 13 24 11 42

M8 13 105 17 30 13 67

M10 17 113 20 38 16 70

M12 19 125 23 42 19 76

M16 24 156 28 51 23 95

M20 30 192 34 64 30 110

M24 36 195 41 72 32 118

1.2 m

Oener81

550 mm min. Stoop 750 mm opt.900mm

000 mm

Table 57: Working space round ISO metric bolts (Source: Ward: 1976). Figure 11: Working space (Soufee : DHSS : 1972).

616O

L........ _ .....1........- _

750mm !: Ladders min. I

I

Provide back guard over 2.1 m height.

~Plimumrange

~ 50°

Optimum ran~e~ 35°150 mm min. ~ 300 ... 20°

Width 380 mm min., 450 mm optimum, Width 600 mm to 750 mm one man - 1.1 m min. two men. 600 mm min. between side walls. (b) 134 mm optimum.

(b) 180 mm - 406 mm - 300 mm optimum. (c) 240 mm - optimum tread. (c) 20 mm - 40 mm dia. rung.

Figure 12: Working Space (Source: DHSS: 1972).

Incline not to exceed 20°

1.1 m at 75° - 1.6 m at 50° Step ladders Ramps

2.1 mOpt.

,-4------- 75° x == 940 mm 65° x == 900 mm

/.....--- 50° x == 860 mm

Optimum range

Width 530 mm to 600 mm with handrails. Width 750 mm min. - 1.1 m optimum. (b) 600 mm min. between side walls. (c) 80 mm - 150 mm tread. (d) 250 mm riser maximum.

Figure 13: Working Space (Source: DHSS : 1972).

l

BS 2871

BS 2871: Part 1 : 1971

BS 3600: 1976 (1988)

BS 4504: 1969 (1975)

BS 4568

BS 4568: Part 1 : 1970

BS 4568: Part 2 : 1970 (1988)

BS 4678

BS 4678: Part 1 : 1971 (1988)

BS 4678: Part 2: 1978 (1985)

BS 5422: 1990

BS 6346: 1988

BS 6480: 1988

Ward, G. : 1976

The Institute of Plumbing: 1988

DHSS: 1972

Specification for sheet metal ductwork. Low, medium and high pressure/velocity air systems.

Specification for malleable cast iron and cast copper alloy threaded pipe fittings.

Discharge and ventilating pipes and fittings, sand-cast or spun in cast iron.

Specification for spigot and socket systems.

Specification for socketless systems.

Specification for malleable cast iron and cast copper alloy threaded pipe fittings.

Specification for screwed and socket steel tubes and tubulars and for plain end steel tubes suitable for weld­ing or for screwing to BS 21 pipe threads.

Specification for copper and copper alloy tubes.

Copper tubes for water, gas and sanitation.

Specification for dimensions and masses per unit length of welded and seamless steel pipes and tubes for pressure purposes.

Specification for flanges and bolting for pipes, valves and fittings. Metric series.

Specification for steel conduit and fittings with metric threads of ISO form of electrical installation.

Steel conduit, bends and couplers.

Fittings and components.

Cable Trunking.

Steel surface trunking.

Steel underfloor (duct) trunking.

Methods for specifying thermal insulating materials on pipes, ductwork and equipment (in the temperature range - 40°C to +700°C).

Specification for PVC-insulated cables for electricity supply.

Specification for impregnated paper-insulated lead or lead alloy sheathed electric cables of rated voltage up to and including 33000V.

ISO-Metric bolt positioning. OEM Design.

Plumbing Engineering Services Design Guide. ISBN 0 9501671 85.

Access and Accommodation for Engineering Services ­Hospital Technical Memorandulll No. 23. ISBN 11 3204744.

~6_2 """"--__----"--- 6_3

BSRIA is an independent, member based research organisation. It was established in 1955 as the Heating and Ventilating Research Association and in 1975 became the Building Services Research & Information Association reflecting a widening of the scope of the Association's work and the industry it serves. In 1990/91 the Association Ilad a turnover of £2.8 million.

The aims of the Association are:

"To assist the building services industry to improve the quality of its products and services, the efficiency of their provision and the effectiveness of their operation"

The BSRIA membership encompasses consultants, contractors, manufacturers, building owners and operators, organisations specialising in, for example, maintenance and commissioning and other interested parties including fuel interests and academic institutions.

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[

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