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IS 4049-2 (1996): Formed ends for tanks and pressurevessels, Part 2: Based on inside diameter basis [MED 17:Chemical Engineering Plants and Related Equipment]

IS 4049 (Part 2) : 1996(Reaffirmed 2001 )

(Tf&fT~ )

Indian StandardFORMED ENDS FOR TANKS AND

PRESSURE VESSELS - SPECIFICATIONPART 2 INSIDE DIAMETER BASIS

( First Revision)

First Reprint MAY 2006

res 23.020.10; 23.020.30

BIS 1996

BUREAU OF INDIAN STANDARDSMANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG

NEW DELHI 110002

REAFFI61MEOZ006

October 1996 Price Group 3

AMENDMENT NO.1 JULY 2006TO

IS 4049 (PART 2) : 1996 FORMED ENDS FOR TANKSAND PRESSURE VESSELS - SPECIFICATION

PART 2 INSIDE DIAMETER BASIS( First Revision)

(Page 1, clause 4.3 ) - Substitute following for the existing clause:'4.3 Length of the Straight Flange - The length of the straight flange shallnot be less than three times the end thickness with a minimum of 38 rom, unlessotherwise agreed to between the manufacturer and the purchaser. '

(ME 17)

Reprography Unit, BIS, New Delhi, India

Chemical Engineering Plants and Related Equipment Sectional Committee, HMD 17

FOREWORDThis Indian Standard (Part 2) (First Revision) was adopted by the Bureau of Indian Standards, after thedraft finalized by the Chemical Engineering Plants and Related Equipment Sectional Committee had beenapproved by the Heavy Mechanical Engineering Division Council.This standard was first published in 1979. This revision of the standard is being brought out to bringit in line with the latest practices being followed in the country. The important modifications being:

a) length of the straight flange revised from 20 rom minimum to 38 mm minimum;b) tolerance on circularity, that is the difference between the maximum and minimum diameter

increased; andc) provision of shallow dished and flanged ends having knuckle radius of 6 percent withdrawn.

Formed ends are used as end closures for pressure vessels, receivers and similar equipments. IS 2825:1969'Code for unfired pressure vessels' specifies anyone of the following shapes for the ends:

a) Hemispherical,b) Semi-ellipsoidal,c) Dished and flanged, andd) Conical.

In this specification only semi-ellipsoidal,dished and flanged ends are covered. The code for unfired pressurevessels (IS 2825:1969) also permits deeper or slightly shallower semi-ellipsoidal ends and dished and flangedends deeper than those specified in this standard. But these shapes are considered 'special' and have not,therefore, been included.The formed ends are designated either on outside diameter basis or inside diameter basis. The Part 1of this standard covers formed ends on outside diameter basis while this Part 2 of the standard coversformed ends on inside diameter basis.The information to be supplied by the purchaser to the manufacturer along with the enquiry or order isgiven in Annex A.For the purpose of deciding whether a particular requirement of this standard is complied with, the finalvalue, observed or calculated, expressing the result of a test or analysis, shall be rounded off in accordancewith IS 2:1960 'Rules for rounding off numerical values (revised)'. The number of significant places retainedin the rounded off value should be the same as that of the specified value in this standard.

IS 4049 (part 2) 1996Indian Standard

FORMED ENDS FOR TANKS ANDPRESSURE VESSELS - SPECIFICATION

PART 2 INSIDE DIAMETER BASIS

(First Revision)1 SCOPEThis standard (Part 2) specifies the profile dimensionsand technical delivery conditions of dished andflanged, pressed or spun ends designed on the basisof inside diameter commonly used as end closuresof pressure vessels, receivers, tanks and similarequipments.1.1 Where the ends have reinforced or flanged-inmanholes, it is recommended that they are made tothe same geometric shape as the plain ends.2 REFERENCEThis standard makes reference to IS 2825:1969 'Codefor unfired pressure vessels' which is a necessaryadjunct to this standard.3 TYPES OF ENDS3.1 The ends shall conform to one of the followingshapes.3.1.1 Deep dished and flanged ends with an internalheightof dishing hi approximately equal to one-quarterof the inside flange diameter D. for pressure vessels,either

a) of semi-ellipsoidal shape with the innercontour of a true ellipse having an axis ratioof2: I with inside diameter as given in Table 1

or

b) of torispherical shape (see Table 1).3.1.2 Dished and flanged ends with an internal heightof dishing h. slightly less than one-fifth of the insideflange diameter D, suitable for pressure vessels (seeTable 2).3.1.3 Shallow dished and flanged ends for tanks andother non-pressure vessels (see Table 3).NOlES

1 IS 2825: 1969 specifies that in the case of dished and flangedends, the inside radius of dishing (Knuckle radius) shall preferablybe not less than 10 percent of the inside diameter and in no caseless than 6 percent of the inside diameter or three times the thicknesswhichever is more.

2 In the case of ends of partial spherical form. the Internal heightof dishIng hi and external height of dishing h

ocan be determined

as follows:

h, =R1 - (R, - DJ.. x (R, + DI..- 2 r,)2 2h

o= R.- (Ro - f!) x (Ro + l!.. .- 2 r)

2 2

where

D, inner diameter of dished end,

Do outer diameter of dished end.

Ro

outer crown radius.

R, Inner crown radius.

ro

outer knuckle radius. and

r l inner knuckle radius.

4 DIMENSIONS4.1 Flange and Dishing DiameterThe inside diameter, the inside crown radius andinside knuckleradius shall conform to the requirementsof Tables 1, 2 and 3.

4.2 Thickness4.2.1 Minimum thickness is the thickness measuredat the thinnest point after manufacture of the dishedends. Nominal thickness is the thickness of the plateused in manufacturing of the dished end.4.2.2 The minimum thickness shall be supplied bythe purchaser based on internal/external pressure andother design loading inclusive of corrosion/erosionallowance as per IS 2825: 1969. For non-pressurevessels and tanks, the minimum thickness shall be asagreedto between the purchaser and the manufacturer.

4.3 Length of the Straight FlangeMinimum length of the straight flange shall be threetimes the end thickness but need not exceed 38 mmexcept when necessary to provide required length oftaper.

4.4 TolerancesThe ends shall be true to shape within the limitsspecified in 4.4.1 to 4.4.4 below, unless more stringenttolerances are specified by the purchaser.4.4.1 CircumferenceThe inside circumference of the straight flange ofthe finished end shall not depart from thecircumference calculated from the inside diameter bymore than the values given below:

Inside diameter upto 5 mmand including 400 mmInside diameter over 0.25 percent400 mm

IS 4049 (Part 2) : 19964.4.2 Circularity

The difference between the maximum and theminimum inside diameters of the straight flange shallnot exceed one percent of inside diameter and shallin no case be greater than D1 + 2500

2004.4.3 ThicknessFrom the point where the crown radius R. joins theknuckle radius r. and at the point where the knuckleradius rj joins the straight portion of the flange end,a gradual thinning is permissible up to maximum of10percent of the nominal thickness or 2 rom whicheveris higher. A similar gradual thinning is permissiblefor ends of semi-ellipsoidal shape. Due to gatheringof material, the thickness in the straight portion ofthe flange may increase. This shall not exceed 15percent of the nominal thickness of the plate.Thickness of the thinnest point of dished end shallnot be less than the minimum thickness specified bythe purchaser.

NOTE - Where dished ends are provided with flanges inmanholes. the thinning is permissible up to a maximum of 40percent of the nominal thickness on the major axis and 15percent of the nominal thickness on the minor axis.

4.4.4 J>rollleThe inside depth of dishing h. shall. not be less thanthe theoretical depth nor shall this depth exceed bymore than 1.25 percent of the inside diameter D, ofthe dished end.S MATERIALThe material of construction shall be carbon steelor low alloy or high alloy steel or non-ferrous metal.The exact specification shall be specified by thepurchaser in his order.6 TECHNICAL DELIVERY CONDITIONSThe following details regarding technical deliveryconditions for dished ends shall be included.6.1 Heat-Treated ConditionsThe dished ends shall be delivered in heat-treatedcondition depending upon the process of dishing,temperature of dishing and the material specification.Heat treated condition of dished end is a subject ofagreement between the manufacturer and thepurchaser.

6.2 Workmanship6.2.1 Descaling shall be carried out to measure thedimensions and to carry out visual inspection. Dishedends shall be free from any injurious defects.6.2.2 Projection, depressions or elongated groovesusually developed during dishing are permissible solong as these depressions are not sharp and theirdepth is within the tolerance limits specified on theplate. Sharp grooves, laminations and other surfacecracks shall be completely removed by grinding orany other suitable method.

2

6.2.3 Where depressions exceed the tolerance limitsspecified on the plate, such depressions shall beremoved by grinding or by welding with thepermission of the purchaser by an approved weldingprocedure. Hammering of surface defects is notpermitted.6.2.4 The heat treatment and radiography requirementsshall be in accordance with IS 2825:1969.6.3 Testing of Dished Ends for Material QualityTo ensure that the material properties are not impairedduring the manufacture of dished ends, samples takenfrom dished ends after the final heat treatment shallbe subjected to mechanical test for tensile strength,impact strength where necessary (for low temperatureapplication) and bend tests as specified in the relevantspecification for the plate material. The location oftest plates is subject to agreement between themanufacturer and the purchaser and may be one ofthe following:

a) Extended portion cut out from the straightflange.

b) Opening cut out for nozzlesc) Separate test plates from the same melt and

heat number subjected to simulation similarto the. dished ends.

6.4 For high alloy steel (austenitic steels in particular,dished end subjected to hot forminglheat treatment)requirement of intergranular corrosion test to checkfor carbide precipitation is to be carried out, whereverspecified and agreed upon between the purchaser andthe supplier.6.S In case of dished end manufactured by spinningprocess, the dished end is to be subjected to dyepenetrant examination on the outside surface ofknuckle region. If desired before by the purchaserit may be carried out on inside surface knuckle regionalso.7 MARKING

7.1 The dished ends shall be marked with thefollowing:

a) Inside diameter,b) Type of dished end,c) Minimum thickness,d) Material of construction, ande) Identification of the source of manufacturer.

7.2 BIS Certification MarkingThe dished ends may also be marked with the StandardMark.7.2.1 The use of the Standard Mark is governed bythe provisions of the Bureau ofIndian Standards Act,1986 and the Rules and Regulations made thereunder.The details ofconditions under which the licence forthe use of the Standard Mark may be granted tomanufacturers or producers may be obtained {romthe Bureau of Indian Standards.

IS 4049 (part 2) 1996Table 1 Dimensions for Deep Dished and Flanged Ends (Torispherical)

(Clauses 3.1.1 and 4.1)All dimensions in millimetres.

D;

Inside Crown Inside Length ofDiameter Radius Knuckle Straight

D, R I Radius Flanger, S,

(I) (2) (3) (4)

400 320 60500 40() 80600 480 100700 560 125800 640 125900 720 150

'1 000 800 150I 100 880 175I 200 960 200I 300 1 040 200I 400 I 120 250I 500 I 200 250I 600 1 280 250I 700 I 360 300I 800 1 440 3001 900 I 520 3002 000 J 600 300 See 4.32 100 1 680 3502 200 1 760 3502 300 1 840 3502 400 1 920 4002 600 2080 4002800 2240 4503000 2400 4503 200 2560 5003 400 2640 6003600 2 880 6003 800 3040 6004000 3 200 6004 250 3400 7004500 3600 7004 750 3800 8005000 4 000 800

N01E - As sizes below 400 correspond to pipe caps, the dimensions shall conform to the outside diameters of pipes.

3

IS 4049 (part 2) : 1996Table 2 Dimensions for Dished and Flanged Ends (Torispherical)

(Clauses 3.1.2 and 4.1)All dimensions in millimetres.

Di

Inside Crown Inside Length ofDiameter Radius Knuckle Straight

D1 R. Radius FlangeT1 Sf

(I) (2) (3) (4)

400 400 40500 500 50600 600 60700 700 75800 800 80900 900 100

1000 1000 1001 100 1 100 1251 200 1200 1251 300 1300 1501.400 1400 1501 500 1 500 1501600 1600 1751 700 1 700 1751800 I 800 200I 900 I 900 2002000 2000 200 See 4.32 100 2 100 2502200 2200 2502300 2300 2502400 2400 2502600 2600 3002800 2800 3003000 3000 3003200 3200 3503400 3400 3503600 3600 4003800 3800 4004000 4000 4004250 4250 4504500 4500 4504 750 4750 5005000 5.000 500

NOlE- As sizes below 400 correspond to pipe caps, the dimensions shall conform to the outside diameters of pipes.

4

IS 4049 (Part 2) : 1996Table 3 Dimensions for Shallow Dished and Flanged Ends for Tanks and Non-pressure Vessels

(Clauses 3.1.3 and 4.1)All dimensions in millimetres.

Inside CroWD Inside Length ofDiameter Radius Knuckle Straight

D. R. Radius Flange'1 S,

(i) .(2) (3) (4)

900 950 501000 1200 50I 100 1400 50I 200 I 500 50I 300 1700 50i 400 1700 50I 500 I 800 50I 600 2000 50I 700 2200 50I 800 2400 50I 900 2600 502000 2800 502 100 3000 502200 3300 50 See 4.32300 3300 502400 3300 502600 3300 502 800 3500 503000 3600 503200 4000 503400 4000 503600 5000 SO3 800 5000 504000 5000 504 250 5500 504500 5500 504750 5500 505000 5500 60

5

IS 4049 (Part 2) 1996ANNEX A(Foreword)

INFORMATION TO BE SUPPLIED BY THE PURCHASER

AI The purchaser shall supply the followinginformation to the manufacturer with the enquiry ororder:

a) Type of dished end required;b) Inside diameter in millimetres;c) Material of construction of the dished end;d) Method of heat treatment;e) Minimum and nominal thickness of the dished

end;

6

f) Radiography and any other non-destructivetesting, if required;

g) Length of straight flange;h) Whether the flange is to be machined and

weld preparation required;j) Special requirements for the welded joints

in a dished end made from more than oneplate;

k) Inspection or survey requirements; andm) Manhole or any connection details, if required.

Bureau of Indian Standards

BlS is a statutory institution established under the Bureau of Indian Standards Act, 1986 to promoteharmonious development of the activities of standardization, marking and quality certification of goodsand attending to connected matters in the country.

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Review of Indian Standards

Amendments are issued to standards as the need arises on the basis of comments. Standards are alsoreviewed periodically; a standard along with amendments is reaffirmed when such review indicates thatno changes are needed; if the review indicates that changes are needed, it is taken up for revision. Usersof Indian Standards should ascertain that they are in possession of the latest amendments or edition byreferring to the latest issue of 'BIS Catalogue' and 'Standards: Monthly Additions'.

This Indian Standard has been developed from Doc: No. HMD 17 (0067).

Amendments Issued Since Publication

Amendment No. Date-of Issue Text Affected

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