Specification for steel cylinders - intended for the storage of

S P E C I F I C A T I O N

FOR

STEEL CYLINDERS

Intended for the Storage of Compressed Acetylene contained ina Porous Substance (Dissolved Acetylene)

Specification for steel cylinders made of Carbon Steel which shall be produced bythe Acid or Basic Open-hearth Process or Basic Electric Furnace Process and shallconform in chemical analysis to the following composition:

not to exceed 0.05%... ... ...Phosphorusnot to exceed 0.05%... ... ... Sulphurfrom 0.45 to 0.75% inclusive... ... ...Manganesenot to exceed 0.30%... ... ...Siliconfrom 0.15 to 0.25% inclusive... ... ...Carbon

(No alloy steel to be used)

Permissible limits of Nickel and Chromium

1. The proportions of the elements Nickel and Chromium occurring in the Steelfrom the normal processes of Steel-making, when determined by standard methodsof chemical analysis for these elements, shall not exceed the limits specified, unlessthe purchaser shall have been notified and given consent for use of material inreasonable excess of these limits.

(a) On samples taken from more than one place or part of any Steel-billetfrom which the Cylinders are to be made and MIXED before analysis:-

Nickel and Chromium together 0.200% maximum0.150% maximum... ... ... ...Chromium0.150% maximum... ... ... ...Nickel

1D.A.2A Amendment 1 22.2.51

(b) On any sample taken from one (only) place or part of a Steel-billetfrom which the cylinders are to be made or from one (only) cylinder:-

Nickel and Chromium together 0.225% maximum0.175% maximum... ... ... ...Chromium0.175% maximum... ... ... ...Nickel

The results of chemical analysis given in the Steel Maker’s Guarantee andCertificate and in the Cylinder Maker’s Guarantee and Certificate shall state clearlywhether the values given for the elements relate to Mixed or Unmixed samples.

2. All piped and segregated material shall be removed from the ingots and thebillets used in the manufacture of the Cylinders shall be absolutely sound and freefrom segregation.


Adopted 28th Sept. 1948

A D D E N D U M 1

to

SPECIFICATION NO. D.A.2A - FORM NO. 412

of

THE BRITISH OXYGEN CO. LTD

for

STEEL CYLINDERS INTENDED FOR THE STORAGE OF COMPRESSEDACETYLENE CONTAINED IN A POROUS MASS - (DISSOLVED ACETYLENE)

PERMITTED SURFACE FINISHING PROCESS

To facilitate inspection and compliance with the requirements ofSpecification D.A.2A. (Sections 11 and 12) as to the surface of the finishedCylinder, the manufacturer may, with the consent of the purchaser, and subject tocompliance with the following additional requirements, clear the surface byshot-blasting or an approved equivalent process prior to final inspection andselection of Cylinders for physical tests.

R E Q U I R E M E N T S

(i) All scale, superficial and/or embedded shall be removed from the entireexternal surface.

(ii) The surface shall be of uniform fine matt bright finish.

(iii) The hardness of the surface shall not be increased above that of thesteel of the Cylinder in the normalised condition by more than 30 VickersDiamond Hardness Number.

(iv) The final thickness of any part of the Cylinder wall shall not be less thanthe minimum specified on the Purchaser’s order, and on drawingsaccompanying such order.

(v) Reasonable precautions must be taken to ensure every Cylinder beingkept dry and free from surface oxidation after processing and protectedagainst oxidation whilst in transport up to point of delivery.

General Conditions for Supply of Steel


3. The billets shall be plainly marked and proper registration thereof made topermit identification of the finished Cylinders, with the original material.

4. The Steel-maker shall guarantee that the blooms and billets are made by anapproved process and conform to the analysis as specified in Paragraph 1, and tothe conditions specified in Paragraph 2. The Steel-maker shall give a certificatestating the Cast Nos. and Billet Markings and corresponding Chemical Analyses.

5. Facilities shall be afforded for the inspection of the steel billets at theSteel-maker’s Works, if so desired.

6. The Cylinder-maker shall satisfy himself that all the above conditions arecomplied with, and shall obtain with the Steel-maker’s Guarantee a Certificatecovering the conditions set out in Paragraphs 1 to 4 inclusive. Copy of thisGuarantee and Certificate shall be supplied to the Purchaser (see “Certificates andRecords,“ Page 7).

Manufacture

7. The Cylinders shall be solid drawn in one piece, without seam or weld, fromeither plates, billets or seamless tubes, which shall conform to the aboverequirements for “Material”.

8. Any material showing cracks, laminations, or other defects during manufactureshall be rejected entirely.

9. The shape, general dimensions, and thickness of wall and base, shall conformto the particulars given on the accompanying Drawing(s) and/or Order(s).

Drawing Nos. ....................................................Order Nos. ........................................................

NOTE: These particulars to be filled in when this Specification is issued

10. Unless the manufacture is by the cold drawing process throughout, the finaloperation whereby each Cylinder is brought to the specified diameter and wallthickness, shall be by the cold drawing process.

11. The surfaces of each Cylinder shall be thoroughly cleaned to permit inspectionof the material of each Cylinder for defects before the final cold drawing process.

12. The internal and external surfaces of each Cylinder after manufacture shall befree from visible surface defects such as -

(a) Surface or embedded scale

(b) Blisters

(c) Seams


(d) Grooves

(e) Folds

(f) Evidence of lamination

(g) Non-metallic inclusions

13. Before the necking operation, each Cylinder shall be examined for -

(a) The above-mentioned surface defects

(b) Roundness

(c) Concentricity

(d) Maximum and minimum thickness of walls specified on theaccompanying Drawing(s) and/or Order(s).

14. The thickness of the walls shall be measured on at least three points atdistances of approximately ¼, ½ and ¾ of the finished length of the Cylinder.

15. After necking and machining, each Cylinder shall be examined internally forfolds near the neck and base. A light, such as an Electric Light, shall be insertedinto each cylinder for this purpose, so that examination can be made through theneck and the plug hole in the base of the Cylinder.

16. The screwing of the neck and the plug hole in the base of each Cylinder shallbe carried out according to the particulars given on the accompanying Drawing(s)and/or Order(s).

Heat Treatment

17. Each Cylinder when completed according to the foregoing specification shall becorrectly heat treated - that is, it shall be heated to a suitable temperature, asspecified below (Paragraph 18), in a properly constructed furnace, and shall beslowly cooled, as specified in Paragraph 19.

18. Each Cylinder shall remain in the furnace until it is uniformly heated throughoutto a temperature of not less than 860oC, and not more than 890oC.

19. Cooling shall take place in still air, and in such a position that the Cylinders arenot subjected to draughts, nor other localised or irregular cooling influences.

20. The Cylinders shall not be stacked one upon the other in either the heating orcooling process.

Testing

21. Each Cylinder shall be subjected to the following specified tests.


Pressure

22. The standard pressure for the Hydrostatic Test shall be 1,000 lbs. per sq. inch.

23. The method of testing shall be such that the specified test pressure cannot beexceeded, either accidentally or otherwise, by more than 50 lbs. per sq. inch.

24. A secondary pressure gauge or equivalent substitute shall be provided forconvenience in checking frequently the Test Pressure.

25. The testing of each Cylinder shall be carried out in a closed water-jacket, sothat the actual volumetric expansion under the Test Pressure can be determinedaccurately.

26. There shall be no permanent stretch of the Cylinder due to testing, but anallowance for rectification of shape not exceeding 10 per cent of the recorded elasticstretch shall be made to cover rounding up of the Cylinder due to test pressure.

27. Each Cylinder shall be allowed to stand in the open, after being removed fromthe water-jacket and thoroughly dried on the outer surface, at a pressure of not lessthan 900 lbs per sq. inch and not greater than the specified test pressure for aperiod of 15 minutes, after which it shall be examined for leakage due to porosity,lamination, or other defects in the material. Alternatively, but only by consent inwriting of the Purchaser, each Cylinder shall be totally submerged in clear water andshow no evidence of leakage due to porosity, laminations or other defects in thematerial when subjected to an internal pressure of compressed air at not less than500 lbs per sq. inch.

28. The maximum pressure to which each Cylinder has been tested shall bestamped on it, together with the date of testing (see MARKINGS).

29. A true record shall be kept of the testing of each Cylinder, including everyCylinder destroyed during testing. The following particulars shall be entered in thisrecord:

(a) Cylinder-maker’s rotation number

(b) Date of Test

(c) Weight of Cylinder empty and dry

(d) Weight of Cylinder filled with water

(e) Water capacity by subtraction of (c) from (d)

(f) Maximum Test Pressure applied

(g) Temporary stretch due to test pressure

(h) Permanent stretch on release of test pressure


(i) Definite statement whether Cylinder passes or fails during test

(j) Remarks - in which the method of disposal of rejected Cylinder(s) shallbe stated.

NOTE: These particulars need not be entered for any Cylinders rejected during testing, but a true record of the number of Cylinders rejected during testing must be made on the test sheet or sheets appertaining to Cylinders

from the same batch of Cylinders

Physical

30. Tensile tests shall be made on the material of one finished Cylinder from everybatch, or in cases in which the number of Cylinders in any batch exceeds 100, thenon the material of at least one finished Cylinder in every 100. If more than one castof steel is used in any batch of Cylinders, then sufficient tensile tests shall be madeon finished Cylinders to be fully representative of each cast of Steel used.

31. The tensile tests shall be made on a bar of the form and dimensions shown onthe Diagram A attached hereto and cut longitudinally from the finished Cylinder.

NOTE: This test conforms to the Standard Test piece specified in the 4th Report of the Gas Cylinders ResearchCommittee (1929) and specified in B.E.S.A. Specification No. 401 (1931) relating to Steel Cylinders for Liquefiable Gases

32. The results of the Tensile Tests shall conform to the following conditions:

(a) Yield Stress : not less than 15 tons per sq. inch

(b) Ultimate Stress : { not less than 28 tons per sq. inch{ not more than 33 tons per sq. inch

(c) Elongation : not less than 15 per cent (1.2 in) on 8-inch gauge lengthand proportionately greater for lesser gauge lengths.

NOTE: The Yield Point shall be the point where the extension of the test bar increases without increases of the load

33. Hardness tests shall be made on the material of each Cylinder from which thetensile test bar has been cut.

34. The Hardness test shall be made by an approved impression method on thematerial of the body of the Cylinder at a point immediately adjacent to thelongitudinal centre of the tensile test bar.

35. The results of the hardness test shall be expressed in Brinell Numbers and shallnot be more than 150.

36. Flattening tests shall be made on one finished Cylinder from every batch, or, incases in which the number of Cylinders in any batch exceeds 100, then on thematerial of at least one finished Cylinder in every 100.

37. Unless the parts of the Cylinder remaining after cutting out the tensile test barprovide a parallel portion equal in length to four times the diameter of the Cylinder to


be used for the flattening test, then another finished Cylinder in every batch, theminimum number being one in every 100, shall be taken for the flattening test.

38. The middle part of the Cylinder shall be placed between two compressionblocks having flat faces 2¾ ins. Wide with corners rounded to ¼ in. Radius asDiagram B. Pressure shall be applied slowly and the Cylinder flattened until thedistance apart of the compression blocks is SIX times the thickness of the walls.The Cylinder shall then be examined, without removing the load, and the test shallbe deemed unsatisfactory if the Cylinder shows any sign of cracking.

NOTE: This test conforms to the Standard FLATTENING test given in B.E.S.A. Specifications Nos. 400 and 401, Revision dated June, 1937

39. A proper detailed record of the tensile and flattening tests and harness valuesshall be made, and the results entered on the Certificate of Tests to be forwarded tothe Purchaser with each consignment of Cylinders.

40. At the request of the Inspector or Purchaser, pieces of the material suitable formicro-photographical examination shall be cut from the base, wall and the neck endof the Cylinder.

41. The specimens used in the tensile and flattening tests and determination ofhardness values shall be forwarded with the Certificates referred to in Paragraph 44.

Marking of Cylinders

42. Each Cylinder shall be stamped by the Cylinder-maker, in an approved position,and legible manner, with:-

On the base of each Cylinder -

(a) The trade or approved identification mark of the Cylinder-maker in anapproved position.

(b) The Cylinder-maker’s rotation number as given on the Certificate ofTest.

(c) The Purchaser’s mark and/or number, if so required, other than thetest mark of the authorised Inspector of the Purchaser.

NOTE: This test mark of the authorised Inspector of the Purchaser shall not be put on any Cylinder except by this Inspectorhimself.

(d) The water capacity of each Cylinder converted into ounces on thebasis of one cubic foot of water weighs 1,000 ounces.

On the top of each Cylinder -

(e) The Cylinder-maker’s approved mark indicating that the Cylinder hasbeen properly heat-treated.


(f) The Cylinder-maker’s approved mark indicating that the Cylinder hasbeen tested, the test pressure and the date of testing.

(g) The Cylinder-maker’s Inspector’s mark, if any. This mark must beapproved by the Purchaser.

(h) Such additional marking, if any, as may be stated on the Drawingsand/or Order.

Cleaning and Drying

43. Each Cylinder shall be thoroughly cleaned, and all traces of oil removed fromthe interior; each Cylinder shall be properly dried out after test, and made airtightwith plugs of wood or metal, which must be inserted in the hole in the neck and thebase of each Cylinder. If the Cylinders are dried by heating, the temperature towhich they shall be heated shall not be sufficiently high to affect in any degree theheat-treatment to which the Cylinders have been subjected, and in no case shallexceed 200oC.

Certificates and Records

44. Certificates in approved form (see specimen Certificates on pages 9-11) shallbe supplied to the Purchaser in triplicate, giving -

(a) The Purchaser’s Official Order number.

(b) The Purchaser’s Official Specification number and date given on thetop of page 1 of this Specification.

(c) Copies of Guarantee(s) and Certificate(s) received from theSteel-maker in accordance with Paragraph’s 4 and 6.

(d) Cylinder-maker’s chemical analysis of the material used.

(e) Results of tensile and flattening tests and hardness values.

(f) The limits of temperature used for heat-treatment.

(g) Cylinder-maker’s rotation numbers of the Cylinders corresponding witheach analysis and particulars of tests given on the Certificates.

(h) Results of the hydraulic and tensile tests.

(i) The weight of each Cylinder, empty and dry.

(j) The water capacity of each Cylinder on the basis one cubic foot ofwater weighs 1,000 ounces.


(k) The minimum and maximum wall thickness ascertained according toParagraph 14, and the measurements of thickness of the Cylindersfrom which the tensile test bars are cut.

(l) The method employed for drying-out and the maximum temperature, ifany, to which the Cylinders have been heated for drying.


(Size of Official Form to be 14 in. deep by 91/2 in. wide)Date: ................................................

(Size of Official Form to be 101/2 in. Deep by 8 in. Wide)

SPECIMEN OF

STEEL-MAKER’S GUARANTEE AND CERTIFICATE

FOR MATERIAL INTENDED FOR

MANUFACTURE FOR STEEL CYLINDERS FOR COMPRESSED ACETYLENE CONTAINED IN A POROUS SUBSTANCE.

(DISSOLVED ACETYLENE)

SPECIFICATION.

Material. -

1. The Cylinders are to be made of Carbon Steel which shall be produced by the Acid or BasicOpen-Hearth Process, and shall conform in chemical

Carbon ... ... ... from 0.15 to 0.25% inclusiveSilicon ... ... ... not to exceed 0.30%Manganese ... ... ... from 0.45 to 0.75% inclusive

Sulphur ... ... ... not to exceed 0.05%Phosphorus ... ... ... not to exceed 0.05%

(No alloy steel to be used.)

2. All piped and segregated material shall be removed from the ingots, and the billets used in themanufacture of the Cylinders shall be absolutely sound and free from segregation.

3. The billets shall be plainly marked and proper registration thereof made to permit identification ofthe finished Cylinders with the original material.

We ...........................................................................................................................................................(Steel-maker’s Name and Address)

Hereby guarantee that the Steel supplied to:-

The Chesterfield Tube Co., Ltd

against their Order No .................. dated ................ confirms to the above general Specification, andWE CERTIFY that the Steel supplied is in accordance with the following particulars:-

(State whether Acid or Basic Open Health orBasic Electric Furnace)

................................................................Process employed for Manufacture

................................................................Our Works Cast No(s)

................................................................Our Works Order No(s)

CHEMICAL ANALYSIS.

Remarks.Chromium.Nickel.Phosphorous.Sulphur.Manganese.Silicon.Carbon.Cast No(s).

For the purpose of identification with the Cast No(s). the Billets supplied are marked as follows:-

...Billet Marking(s)

...Cast No(s)

Date .........................................................................(Steel-makers)

Signed .................................................................................

(Name of Inspector)...........................................................................................................................

been inspected on behalf of the purchasers by }havehave not{The billets


SPECIMEN OF

CYLINDER MAKER’S GUARANTEE AND CERTIFICATE

FOR MATERIAL USED FOR STEEL CYLINDERS INTENDED FOR COMPRESSED ACETYLENE

CONTAINED IN A POROUS SUBSTANCE.(DISSOLVED ACETYLENE)

WE, the undersigned, hereby guarantee that the Steel Cylinders, as Rotation Nos, given on Pressure Tests Sheets Nos. .............................attached supplied to THE BRITISH OXYGEN CO., LTD., against their Order ................................. Makers Works Order or ReferenceNo.(s)..........................for.............cylinders of ..................... have been manufactured in accordance with their drawing No(s) .............................and their Specifications marked ................................. from material supplied and guaranteed by .......................................... to our Order No(s) ........................ A copy of the Steelmaker’s Guarantee and Certificate(s), dated .............................. is attached hereto. We certify (1) thatchemical analyses made on representative samples of the Steel, taken either during or after manufacture of the Cylinders covered by thisGuarantee and the attached Certificate of Test(s) gives the following results:-

Chromium.Nickel.Phosphorous.Sulphur.Manganese.Silicon.Carbon.Cast No.Steelmaker.

2. That physical tests made on a test piece cut from one finished Cylinder from every batch, or in cases in which the number of Cylinders in anybatch exceeds 100, then on the material of at least one Cylinder in every 100, gave the following results:-

ToFrom

Area.

sq. ins.

Thickness.

ins.

Width.

ins.

Brinellhardness

adjacent tolongitudinal

centre ofTest Piece.

Reductionin Area per

cent.

Elongationper cent

on ....... ins.

Ultimate stressin tons

per sq. in.

YieldPoint

in tons persq. in.

RepresentingCylinder

Nos.inclusive.

Cut fromCylinder

No.

Size of Test Piece.Test PieceNo. or Mark

3. That the thickness of wall in the cylindrical portion of the Cylinder(s) from which the test piece(s) have been cut have been measured and are as follows:-

Maximum.Minimum.Thickness of Cylinder Wall.Cylinder No.

and that the minimum wall thickness of the Cylinder(s) covered by this Guarantee and Certificate measures before necking is............................................4. That flattening tests made on one finished cylinder from every batch, or in the cases in which the number in any batch exceeds 100, then on thematerial of one finished cylinder in every 100 by the method defined in the Specification referred to above, have given the following results ;-

Result of Flattening Test*Cylinder No.

*NOTE - State definitely whether or not cracks occur and, if so, the distance between compression blocks when cracks are detectable.5. That all Cylinders made from the materials covered by this Certificate have been properly heat-treated before testing to a temperature of .............................6. That all finished Cylinders have been dried out by (state method employed) .......................................................................................................................................................................................................................................................NOTE - In the case of Cylinders dried by heating, the temperature to which the Cylinders have been subjected during the process of drying mustbe stated. 7. That each Cylinder has stamped on its base our Rotation Number and our approved Trade Mark, which is ...................................8. That each Cylinder has stamped on its top the approved mark for heat treatment, the test pressure applied, and date of test, as well as ourInspection Mark, which is ................................................................

Cylinder Maker.Secretary. For the Chesterfield Tube Co. Ltd.Signed ................................................................................................

..................................................Maker’s Inspection...................................................Purchaser’s Inspector

..................................................Maker’s Inspection Mark ...................................................Purchaser’s Inspection Mark


(Size of Official Form to be 14 in. deep by 91/2 in. wide)Sheet No: ................................................

Date: ................................................

CHESTERFIELD TUBE CO., LTD., CHESTERFIELD

SPECIMEN OF

CERTIFICATE OF PRESSURE TESTS.

ALL CYLINDERS TESTED TO lbs. PER Sq. INCH IN WATER JACKET.

per ct.cu. ft.cu. ft.cu. ft.lbs. ozs.lbs. ozs.lbs. ozs.lbs. ozs.

Emptyand dry.

Full ofWater.

Remarks(State

whetherCylinder is

passed,rejected or

destroyed forPhysicalTests).

Date ofTests.

Permanentstretch if any

Totalstretch atMaximum

TestPressure

Water capacityMaker’s weightCustomer’s

WeightEmpty and

Dry.

CastNo. orBillet

Marking.

Makers’Rotation

No.


Specification for steel cylinders - intended for the storage of

Documents

Transcript of Specification for steel cylinders - intended for the storage of