Hd 201 Rsteam Piping

7/29/2019 Hd 201 Rsteam Piping

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PDVSA N TITLE

REV. DATE DESCRIPTION PAG. REV. APPD. APPD.

APPD.BY DATEDATE

VOLUME 13II

E PDVSA, 1983

HD201R STEAM TRACING PIPING REQUIREMENTS

FOR APPROVAL

Jos Gilarranz Eduardo Santamaria

ENGINEERING SPECIFICATION

FEB.89

MAY.901

0

24

27

ENGINEERING DESIGN MANUAL

SPECIALISTS

APPD.BY

PDVSA
http://especialistas/hd-201-r.pdfhttp://especialistas/hd-201-r.pdf


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STEAM TRACING PIPING REQUIREMENT MAY.901

PDVSA HD201R

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.Men Principal Indice manual Indice volumen Indice norma

PDVSA

Index

1 GENERAL 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.1 Scope 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.2 References 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.3 Regulations 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2 DESIGN 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.1 General Arrangement 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.2 Identification of Tracing System 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3 GENERAL INSTALLATION REQUIREMENTS 4. . . . . . . . . . . . . . . . . .

3.1 Design of Tracer 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3.2 Appurtenance Tracing 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.3 Instruments 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.4 Relief Valve 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.5 Drains 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.6 Size and Length of Tracers 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.7 Trap Hookup 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.8 Tracer Condensate Collection 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.9 Strainers 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3.10 Attachment of Tracers 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.11 Expansion Loops 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.12 Supports 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3.13 Testing 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4 MATERIALS 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4.1 Copper 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4.2 Stainless Steel 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4.3 Traps 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4.4 Valves 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4.5 Pipe and Miscellaneous Material 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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1 GENERAL

1.1 Scope

1.1.1 This specification contains requirements for the design, selection of materials,and installation of steam tracing. It should be used to prepare drawings andmodel work defining the steam tracing systems to be installed on the project.

1.1.2 Items requiring steam tracing, such as process and utility piping, instruments,equipment, etc. shall be shown traced on the applicable Piping and Instrument(P&I) flow diagrams and/or as specified on the line schedules.

1.2 References

1.2.1 Additional requirements applicable to Steam Tracing are contained in thefollowing Engineering Specifications:

Process and Utility Piping Design Requirements PDVSA H251

Piping Materials PDVSA H221

Piping Fabrication Requirements PDVSA H231

Insulation Material and Application Hot Service PDVSA L212

1.2.2 The following codes, standards and practices, including applicable addenda, ineffect as of the lastest edition, shall form a part of this specification to the extentspecified herein.

American Society for Testing and Materials (ASTM)

B68 Specification for Seamless Copper Tubing, Bright Annealed.

B75 Specification for Seamless Copper Tubing

American National Standards Institute (ANSI)

B31.3 Chemical Plant and Petroleum Refinery Piping

1.3 Regulations

This specification requires compliance with all Venezuelan laws, standards andregulations which may be applicable.

2 DESIGN

2.1 General Arrangement

2.1.1 Manifolds shall be provided for supply leads and condensate returns. SeeAppendix V.

2.1.2 Single tracer suppliying from the steam main shall not be used unless the traceris in a remote location.
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2.1.3 The rules to be followed in determining the size and locations of manifolds are as

follows:a. Manifolds shall be supplied when there are six or more connections located

so the maximum distance from the supply lead to the item being traced doesnot exceed approximately 18 meters.

b. In establishing the maximum distance, assume that tracer supplies andreturns are, routed NorthSouth, EastWest and vertically; not the shortestdistance between two points.

c. The developed length for each supply and return shall include a 10%allowance for indirect routed such as U type configurations to avoidinterferences.

d. Manifolds shall be 3 inches in size and mounted either horizontally orvertically.

e. Connections not used are to be blocked off and will serve as leads for futureconnections.

2.1.4 A single Y type strainer shall be installed in the supply line to the manifold andlocated as close to the manifold as practical.

2.1.5 The location of tracer steam and condensate manifolds will be shown, wherepossible, on the model or arrangement drawings.

2.1.6 The first block valve on steam mains for tracer manifold supplies will be locatedpreferentially on the model and/or shown on the drawings.

2.1.7 The location of condensate returns to condensate mains shall be determined bythe personnel at the construction site.

2.1.8 Block valves shall be accesible from grade, ladder or platforms and shall begrouped in central locations.

2.1.9 All tracer supplies and tracers shall be routed to avoid pockets.

2.1.10 Steam supplies and manifolds shall be arranged to provide the most economialinstallation without sacrificing freezing, operation or maintenance designconsiderations.

2.1.11 Each tracer supply point shall be located at an elevation above the highest pointof the item being traced.

2.1.12 Condensate from tracing steam traps shall normally be returned to thecondensate return system.

2.1.13 Where this is not economical and with the prior approval of the Owner, thecondensate may be discharged to grade.
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2.2 Identification of Tracing System

2.2.1 The steam supply line and the condensate line shall be provided with metal tagsbearing the number corresponding to the tracer number, as shown on theTabulation of Tracer drawings.

2.2.2 The tags shall be located on or adjacent to both the steam supply block valve andthe trap on the condensate return end.

2.2.3 The Dymo Model 101100 Tapewriter using stainless steel tape fastened with poprivets is an easy and inexpensive method of metal tagging.

3 GENERAL INSTALLATION REQUIREMENTS

3.1 Design of Tracer

3.1.1 Tracers shall be installed in accordance with Appendices I, II, III, VI, VII, VIII andIX. Appendices I thru IX are typical and should be used for guidance only.

3.1.2 Tracers shall follow the contour of valves, pumps, and other equipment havingnonregular surfaces.

3.1.3 Pockets shall be avoided or kept to a minimum.

3.1.4 No special straightening of tubing is necessary.

3.1.5 A slight waviness can serve to accommodate expansion.3.1.6 Tracers on horizontal lines shall be installed in accordance with Appendices I and

II.

3.1.7 Multiple tracers used on vertical lines shall be equally spaced around thecircumference of the pipe. See Appendix II.

3.1.8 For change of direction, all tubing shall be bent and have a minimum bend radiusof six times the outside diameter of the tubing.

3.1.9 Crimped tubes will be rejected.

3.1.10 Each tracer tube shall be individually trapped except at bypasses at control valvesor other similar hookups.

3.1.11 No parallel tracers shall be combined and discharged to a single trap.

3.1.12 All lines are to be routed in a neat and orderly manner using the followingguidelines:

Tracer supply and return lines shall be located on the manifolds so the run ofthe piping will peel off to the item being traced, rather than cross over otherpiping.


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Any offset of these lines, other than 90, should be made in the horizontal plane

rather than the vertical plane which will tend to conceal these offsets byblending with the vertical and horizontal lines of the plant.

All lines shall be routed and shall be at right angles to the nearest pipe runs andshall be free from any sag so as to maintain a neat appearance.

Supply and return lines shall be set to the same radius in order to present auniform flow.

3.2 Appurtenance Tracing

3.2.1 Sample connections, drains, vents, and closecoupled noncritical instrumentsattached to pipelines or equipment shall be traced with the pipeline or equipmenttracer.

3.2.2 The first shutoff valve on a branch line off a steam traced line shall be traced,although the branch line may not be traced.

3.3 Instruments

3.3.1 All instruments which require steam tracing, except closecoupled noncriticaltypes, shall be provided with individual tracers.

3.4 Relief Valve

3.4.1 Apply tracer at relief valve as close as possible to valve seat to provide complete

protection.

3.5 Drains

3.5.1 Tracers need not have low point drains.

3.6 Size and Length of Tracers

3.6.1 Use single or multiple tracers and lengths as follows:

Line Size Number of Tracers

4 & Smaller 16 to 16 2

18 & Larger 3

Steam Pressurekg/cm2 (gauge)

3,5 7 10,5 14 17,6 21,1 and higher

Tracer Lengthmeters

38 46 53 61 69 76


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3.6.2 The above lenths are based on 1/2 inch OD tubing. Multiply these lengths by 0,75

for 3/8 inch OD tubing.3.6.3 Use 3/8 inch OD tubing instead of 1/2 inch OD to facilitate bending at control valve

stations etc.

3.6.4 These lengths apply to open trap discharge and insulation thickness of 1 inch or1 1/2 inches.

3.6.5 For closed condensate return systems, reduce the tracer lengths 0,9 meters foreach Kg of back pressure at the trap.

3.6.6 Where pockets cannot be avoided, such as in tracing of valves, flanges, etc., thesum of tracer pocket heights in meters shall not exceed 0,70 x 10% of inlet steam

pressure.

3.7 Trap Hookup

3.7.1 The basic steam trap shall be thermodynamic type as specified in Paragraph 4.3

3.7.2 These traps shall be used for steam pressures of 0,35 to 42,2 kg/cm2 (gauge)where closed condensate return systems do not cause back pressures at the trapin excess of 80% of the trap inlet pressure.

3.7.3 Steam tracing installation shall be arranged to facilitate convenient removal forreplacement or repair of the trap.

3.7.4 For a closed condensate system, with or without back pressure on the system,locate traps close to and above the condensate manifold or condensate returnline.

3.7.5 For an open condensate system, locate traps close to point of discharge socondensate will drain freely from the discharge side of the trap (see Appendix IV).

3.7.6 Thermodynamic traps shall preferably be installed in the vertical.

3.7.7 Where necessary to install in the horizontal, the trap shall be rotated 90 so thebonnet of the trap is on the side.

3.8 Tracer Condensate Collection

Locate the tracer condensate header, whenever possible, at an elevation lowenough to permit flow of condensate from all connected tracer condensate lines.

3.9 Strainers

3.9.1 Where manifolds are used, a single Y strainer shall be installed in the supply lineto the manifold and no additional strainer will be required ahead of the traps.


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3.9.2 Where the alternate arrangement of a single tracer taken off a steam main is used,

each trap shall have a strainer built into the trap.

3.10 Attachment of Tracers

3.10.1 Tracers shall be attached to pipe by 12,5 mm wide x 0,38 mm thick, Type 304,stainless steel strapping on approximately 1 meter centers.

3.10.2 Between changes of direction, tracers should be banded snugly but still looseenough so as not to restrain the expansion of the tracer.

3.10.3 Spacers shall be provided between tracers and the piping or equipment when thefollowing fluids are in the line being traced.

Caustic fluids Acid fluids

Fluids where hot spots will accelerate the corrosion rate due to the electrolyticproperties

Heat sensitive fluids.

3.10.4 Spacers can be Transite or Marinite 12,5 mm thick x 12,5 mm wide x 76 mm long.

3.10.5 Where the pipe is austenitic stainless steel, spacers shall be coated with sodiumsilicate before installation.

3.11 Expansion Loops3.11.1 Expansion loops shall be provided at approximately 12 meter intervals.

3.11.2 Loops at tube fittings, changes in direction, valves and flanges shal serve asexpansion loops (see Appendix III).

3.12 Supports

3.12.1 All pipe and tubing including tracer supply and condensate returns installed fortracing purposes shall be adequately supported in the field using channels andclamps similar to Unistrut or equal.

3.12.2 Tracers shall be supported from steel wherever possible.

3.12.3 If there is no steel in the area and tracers are supported from pipe, select lineswhich are cold or uninsulated if possible.

3.12.4 If supported from as insulated line, provision shall be made for thermal expansion.

3.13 Testing

3.13.1 The tracer system shall be pressure tested prior to insulating.


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3.13.2 Hydrostatic test pressure shall be at least 7 kg/cm2 (gauge) or 1 1/2 times the

design pressure, whichever is greater.

4 MATERIALS

4.1 Copper

4.1.1 Copper Tubing

a. Systems using copper tubing shall be limited to 200 C.

b. Leads and returns to and from the tubing adjacent to the traced item shallbe preinsulated and jacketed tubing as follows:

1/2 inch OD x 0.049 inch wall seamless soft annealed copper tubing ASTMB68 or B75 insulated with inorganic fiberous glass (KTex or equal) and

jacketed with 105 C PVC.

c. Sufficient insulation shall be furnished to provide a maximum surfacetemperature of 60 C at 27 C ambient.

d. Tubing shall be furnished in 76 meter of 152 meter coils on sturdy woodenreels.

e. Bare copper tubing adjacent to traced item should be a choice of seamlesscopper soft annealed ASTM B68 or B75.

4.1.2 Tube Fittings

Tube fittings should be brass flareless type, Swagelok or equal.

4.2 Stainless Steel

4.2.1 Stainless Steel Tubing

a. Stainless Steel Tubing shall be used as tracer tubing and noted on pipingisometric drawings when one or more of the following conditions exist:

a. When the steam used for tracing exceeds 200 C.

b. When the system being traced operates at design temperatures exceeding

200 C.c. When the process in the area preclude the use of copper. (Eg. acetylene)

b. Bare stainless steel tubing adjacent to traced items should be of welded type304 stainless steel per ASTM A269 as follows:

3/8 OD x 0,035 wall thickness

1/2 OD x 0,035 wall thickness

c. Stainless steel tubing shall be furnished in the manufacturer s standardmaximum lenght coils on sturdy wooden reels.


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d. Leads to and returns from the stainless steel tracer shall be preinsulated

and jacketed as follows:1/2 in. OD x 0,035 in. wall thickness, welded type 316 stainless steel tubing(ASTM A269) insulated with inorganic fiberous glass (Ktex or equal) and

jacketed with 105 C PVC.

e. The insulation on the preinsulated tubing shall be thick enough to providea maximum surface temperature of 60 C at 27 C ambient air temperature.

4.2.2 Tube fittings should be type 316 stainless steel flareless type, Swagelok or equal.

4.3 Traps

4.3.1 Traps should be 1/2 inch NPT floating disc type Sarco, Yarway or equal.

4.3.2 Traps shall be furnished with an integral strainer when the supply line is taken offa steam main as a single tracer lead. (Refer to Paragraph 3.9).

4.4 Valves

4.4.1 Valves upstream of traps shall be suitable for the supply steam; refer to the LineSpec. for steam in the Engineering Specification Piping Materials,PDVSAH221.

4.4.2 Valves downstream of traps shall be suitable for the condensate return system;

refer to the Line Spec. for steam condensate in the Engineering SpecificationPiping Materials, PDVSAH221.

4.5 Pipe and Miscellaneous Material

4.5.1 Pipe, pipe fittings, and other pipe material not listed above that are upstream ofthe trap shall be the same Class rating and Material as the Steam Supply LineSpec. in the Engineering SpecificationPiping Materials, PDVSAH221.

4.5.2 Pipe, pipe fittings and other pipe material located downstream of the trap shall bethe same Class rating and Material as the Condensate System Line Spec. in the

Engineering SpecificationPiping Materials, PDVSAH221.
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APPENDIX I

DETAILS FOR SINGLE TRACER TUBING

MOULDED BLOCK INSULATION

PIPINGS

SECTION THROUGH ALL HORIZONTALAND VERTICAL LINES

WIRE TIES ON 1.2 M CENTERS

STEAM TRACER(BEND OFF CENTER AT PIPE SHOES)

DETATIL OF WRAP AROUND TRACERFOR VERTICAL LINES

WIRE TIES ON 1.2 M CENTERS

MOULDED BLOCK INSULATION

STEAM TRACER


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APPENDIX II

DETAILS FOR MULTIPLE TRACER TUBING

TOP

TOP

INSULATION

WIRE TIES ON1.2 M CENTERS

STEAM TRACERS

(BEND TO STRADDLE PIPE SHOES)

(2 TRACERS)

HORIZONTAL LINE VERTICAL LINE

(3 TRACERS)


30 30

120 120


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APPENDIX II CONTD

DETAILS FOR MULTIPLE TRACER TUBING

TOP


(4 TRACERS)

INSULATION

WIRE TIES ON

1.2 M CENTERS

STEAM TRACERS


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APPENDIX III CONTD

TYPICAL STEAM TRACING INSTALLATIONS

NOTE:SUPPLY AND RETURN RISERS

TO BE SIZED FOR NUMBER OFTRACERS REQUIRED ANDLOCATED IN THE STRUCTURETO SUIT THE LOCATION OFITEMS TO BE TRACED.

TO STEAM TRACERS

GATE VALVE

STEAM HEADER

TRAP FOR RISER

TO SEWER OR CONDENSATECOLLECTING SYSTEN

FROMTRAPS

STEAMTRACER

STEAM TRACING FOR LARGE VALVE BODY(3 AND LARGER)

(IF BONNET IS NOT FLAT,TRACING SHOULD INCLUDE IT)

SUPPLY AND RETURN PIPINGAT TOWER STRUCTURE


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APPENDIX III CONTD

TYPICAL STEAM TRACING INSTALLATIONS

IMPULSE ORTHERMODYNAMIC TRAP

STEAM TRACERS

CONDENSATE RETURN

TRAP

GATE VALVES

STEAMNEADER

STEAM TRACERS FOR HEADER AND BRANCHES


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APPENDIX IV

TRAP ARRANGEMENTS(OPEN DISCHARGE)

STEAM TRACED ITEM

CONNECTOR 1/2 LINE

1/2 TRAP

6 OR 8 DIAMETER SCRAP PIPEAPPROX. 1.3 METERS LONG FILLEDWITH LOOSE SHELL OR GRAVEL150mm

GRADE

SLOPE1/2 STEAMTRACER

PLAN

TRACER CONDENSATEHEADER

SLOPE

VENT STACK11/2 FOR 2 OR 3 HEADERS2 FOR 4 TO 6 HEADERS3 FOR 7 TO 12 HEADERS

SAME AS FOR ABOVE OR SEWER

VENT STACK

LOCATE TOP OF STACKABOVE HEADROOM BUTNOT UNDER PLATFORMS

OR PIPE RACKS


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APPENDIX V

TYPICAL MANIFOLD ARRANGEMENT

2 SOCKOLET 3000 A105

(1) REQD

1 SCH 80 NIPPLES A106/B

PLAIN END TYPICAL (7)

REQD

3 WELDED

CAP (2)

REQD3 SCH 40 PIPE A53 GR.B

3/4 SOCKOLET

3000 A105 (1)

REQD

1/2 SCH 80 NIPPLES

A106/B PLAIN END

TYPICAL (4) REQD

No. REQD___TYPE A

No. REQD___TYPE B

SECTION AA TYPICAL

FULL FILLET WELD

2 SOCKOLET

3000 A105 (1)

REQD

3 SCH. 40 PIPEA53 GR. B

3/4 SOCKOLET

3000 A105 (1)

REQD1500 MM

TYPE B

TYPE A

2400 MM

150 MM

300 MM TIP

150 MM

150 MM

A

A


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APPENDIX VI

MANIFOLD PIPING ARRANGEMENT

1/2 SW NPT

1/2 PIPE

STEAMMAIN

FOR LINE NUMBER &

SPEC. SEE / ISOMETRIC

OR PIPING ONE

2 YSTRAINER

FROM SUPPORT

POINT

455mm

ANCHORSUPPORTBY FIELD

RESTINGSUPPORTBY FIELD

(M) INSULATION

3/4 FIELD TO ROUTE TO

NEAREST COND. TRACER

MANIFOLD OR COND. HEADER

T

NIN1/2 TRAP

STEAM TRACING MANIFOLD(STM3A) see legend

1/2SWN

PT

TR3

A4

1/2 SPARE

3/4

3/4 x 1/2RED TEE

1/2 TRACER SUPPLY

TRACERSUPPLY

PREINSULATED TUBING

MALE CONNECTOR(TYP)

COND. MAIN

FOR LINE SIZE NUMBER& ESPEC. SEE ISOME-TRIC OR PIPING DWG

150mm

2

3/4 VENT.

3/4 VENT.

1/2 TRAP

1/2 SW NPT

150mm

TR3A4

ANCHOR

SUPPORTBY FIELD

RESTINGSUPPORTBY FIELD

455mm

FROM SUPPORT

POINT(M) INSULATION

1/2 SPARE

UNION

NO INSULATION REQDFROM TRAP THRU LOWERNIPPLE (TYPICAL)

1/2 TRACER RETURNPREINSULATED TUBING

MALE CONNECTOR (TYP)MALE CONNECTOR

PREINSULATEDTUBING

ALTERNATE ARRANGE-MENT WHEN SINGLETRACER SUPPLY & RE-TURN IS USED

UNION

1/2 TRAP COND. MAINTRACER (see ISOor PIPING DNG)

CONDENSATE TRACER MANIFOLD

(CTM3A) see legend

LEGEND

DENOTESTRACER

DENOTES MODEL TA-BLE NUMBER OR PI-PING DWG NUMBER

DENOTES TRACERLEAD NUMBER

DENOTES TYPEMANIFOLD

DENOTES MANIFOLD

TR3A1

STM 3A

CTM 3A

STA OF TRACER

FINISH OF TRACER

S

F


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APPENDIX VII

TYPICAL STEAM TRACING FOR VESSEL

COILS ON 15 CM CENTERS ON BOT-TOM OF VESSEL

NOTE: investigate plate coils as a more economical alternate.

TO TRAP

TO TRAP TO TRAP

TO TRAP

COIL ON 15 CM CEN-TERS

FROM HEADER

PLAN VIEW

TO

TRAP

TO

TRAP

TO

TRAP

STEAM HEADER


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APPENDIX VII CONTD

TYPICAL STEAM TRACING FOR VESSEL

1 O.D. TUBINGCOILS ON 30.5CM CENTERS

PLAN

ELEVATION

FROMH

EADER

FROMH

EADER

TO TRAPS

NOTE: INVESTIGATE PLATECOILS AS MORE ECONOMICAL ALTERNATE.


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APPENDIX VIII

STEAM TRACING OF INSTRUMENTS

STEAM TRACER

STEAM TRACER

TO TRAP

STEAM TRACING FOR PRESSUREGAUGE IS STEAM TRACED

STEAM TRACING FOR CONTROL VALVEAND PRESSURE LEAD IN TRACED LINE

TO TRAP

TO TRAP

STEAM TRACING FOR LIQUIDLEVEL INSTRUMENT

STEAM TRACING FOR GAUGE GLASSES

FROM HEADER

1/2 O.D. TUBING

1/2 O.D. TUBING

STEAM TRACER

NOTE: INSULATION FOR GAUGE GLASSES TO BE ONE HALF SECTION OF PIPE IN-SULATION COVERED WITH PLASTIC. STEAM TRACER TO BE ON BACK OF RE-FLEX TYPE GLASSES AND ON ONE SIDE OF THROUGH VISION TYPE.


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APPENDIX VIII CONTD

STEAM TRACING OF INSTRUMENTS

FROM HEADER

STEAM TRACING FOR PRESSUREINSTRUMENT

ENCLOSURE

CONNECT TRACER TOHEATING ELEMENT

CONNECT TRACER TOHEATING ELEMENT

ENCLOSURE

FIG. AFIG. B

STEAM TRACING FOR LIQUIDFLOWMETER WITHOUT SEAL POTS

FROM HEADER

GROUP AND INSULATE

FROM HEADERFROM HEADER

STEAM TRACING AT SEAL POTSFIG. C

FIG. D

STEAM TRACING FOR STEAMFLOWMETERNOTE: TRACER FOR FACE ORIFICE LEAD TO BE WRAPPEDAROUND POTS FORMING CLOSE COIL FOR UPPER SECTION OF

POTS ENTIRE ASSEMBLY TO BE INSULATED.

TO TRAP

TO METER

STEAM TRACE AND IN-SULATELOWER HALF COLDSPOTS AND LEADS TOENCLOSURE

GROUP AND IN-SULATE

CONT. TO ENCLOSURESAME AS FIG. B


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APPENDIX IX

HEATED RACK FOR SMALL LINES

No. 24 GAUGE GALV. SHEETMETAL COVER

1 1/2 BLOCK INSU-LATION

HEATING LINE

HEATED RACK FOR SMALL LINES

NOTE: THE HEATING COIL SHALL BE 3/4 PIPE WHEN LIVE STEAM IS USED AND 1 PIPE WHEN EXHAUSTSTEAM IS USED. IN EACH CASE, THE MAXIMUM LENGTH TO BE USED WITH ONE TRAP SHALL BE 76.2 m.

Hd 201 Rsteam Piping

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