【AS澳大利亞標準】AS2470-2005Steelcylindersforcompressedgases—Weldedthree-piececonstructionwithlongitudinaljoint—11kgto150kg.doc

as 247020052470 20 05asaustralian standardsteel cylinders for compressed gases welded three-piece construction with longitudinal joint11 kg to 150 kgthe standard is downloaded from standard sharingthis australian standard was prepared by committee me-002, gas cylinders. it was approved on behalf of the council of standards australia on 16 may 2005. this standard was published on 29 june 2005.the following are represented on committee me-002:air conditioning and refrigeration wholesalers associationaustralasian institute of engineer surveyors australian chamber of commerce and industry the australian gas associationaustralian liquefied petroleum gas associationcertification bodies (australia)department for administrative and information services, s.a. fire protection association of australiainstitute of materials engineering australasia pressure equipment associated incorporated victorian workcover authoritywelding technology institute of australiaworkcover new south waleskeeping standards up-to-datestandards are living documents which reflect progress in science, technology and systems. to maintain their currency, all standards are periodically reviewed, and new editions are published. between editions, amendments may be issued.standards may also be withdrawn. it is important that readers assure themselvesthey are using a current standard, which should include any amendments which may have been published since the standard was purchased.detailed information about standards can be found by visiting the standards web shop at .au and looking up the relevant standard in the on-line catalogue.alternatively, the printed catalogue provides information current at 1 january each year, and the monthly magazine, the global standard, has a full listing of revisions and amendments published each month.australian standardstm and other products and services developed by standards australia are published and distributed under contract by sai global, which operates the standards web shop.we also welcome suggestions for improvement in our standards, and especially encourage readers to notify us immediately of any apparent inaccuracies or ambiguities. contact us via email at .au, or write to the chief executive, standards australia, gpo box 5420, sydney, nsw 2001.this standard was issued in draft form for comment as dr 04567.as 24702005australian standardsteel cylinders for compressed gases welded three-piece construction with longitudinal joint11 kg to 150 kgoriginated as part of as b151950. previous edition as 24701998. fifth edition 2005.copyright standards australiaall rights are reserved. no part of this work may be reproduced or copied in any form or by any means, electronic or mechanical, including photocopying, without the written permission of the publisher.published by standards australia, gpo box 5420, sydney, nsw 2001, australiaisbn 0 7337 6786 93as 24702005prefacethis standard was prepared by the australian members of the joint standardsaustralia/standards new zealand committee me-002, gas cylinders to supersedeas 24701998,steel cylinders for compressed gaseswelded three-piece construction with longitudinal joint11 kg to 150 kg. after consultation with stakeholders in bothcountries, standards australia and standards new zealand decided to develop this standardas an australian standard, rather than an australian/new zealand standard.the objective of this revision is to align the radiographic inspection requirements to those of iso 4706, refillable welded steel gas cylinders.this standard is one of a suite of three standards for welded and brazed cylinders for compressed gases, the other standards being as follows:as24693577steel cylinders for compressed gaseswelded two-piece construction0.1 kg to 150 kgsteel cylinders for compressed gaseswelded150 kg to 500 kgthe standard is downloaded from standard sharingthis standard provides for gas cylinders produced in large quantities. users of this standard should note that a competent person will require quality control procedures to be employed at the point of manufacture in australia. for cylinders manufactured overseas, a recognized third party inspection body will witness the inspection and tests. sampling and testing at the point of entry into australia may be required. it should also be noted that before a gas cylinder can be first filled in australia it must be stamped with a certified gas cylinder test station registered mark in accordance with the relevant standard in theas 2030 series.the terms normative and informative have been used in this standard to define the application of the appendix to which they apply. a normative appendix is an integral part of a standard, whereas an informative appendix is only for information and guidance.contentspage1scope. 42referenced documents. 43definitions. 44material. 55design and construction . 76welding. 117inspection and testing. 138heat treatment . 159mechanical tests. 1610pressure tests . 1811typetests. 1812surface coatings. 2013record and test certificate(s) . 2114stamping . 2215preparation for dispatch. 22appendicesasuggested minimum information to be suppliedby the purchaser. 23blist of referenced standards . 24cresistance spot welding for non-pressure-retaining attachments. 26dtest specimens . 27esuggested form of manufacturers record and test certificate. 289as 24702005the standard is downloaded from standard sharingstandards australiaaustralian standardsteel cylinders for compressed gaseswelded three-piece construction with longitudinal joint11 kg to 150 kg1scopethis standard specifies requirements for welded carbon and stainless steel cylinders withone longitudinal and two circumferential joints, of water capacity not less than 11 kg normore than 150 kg, which have test pressures from 1750 kpa to 7000 kpa, and are intended for the storage and transport of compressed gases in accordance with as 2030.1.notes:1 a gas cylinder manufactured by welding but which includes any brazing of, or on, thepressure-retaining portions is, for the purpose of this standard, considered to be a brazed gas cylinder.2other australian standards for brazed and welded gas cylinders are as 2468, as 2469 andas 3577.3 appendix a lists the suggested minimum information that should be supplied by the purchaser when ordering gas cylinders to this standard.2referenced documentsa list of documents referred to in this standard is given in appendix b.3definitionsfor the purpose of this standard, the definitions given in as 2030.1 and those below apply.3.1attachmentany fitting attached to the pressure-retaining sections of the cylinder by welding, including bosses, pads, valve protection rings, and foot rings.3.2competent persona person who has acquired through training, qualification or experience, or a combination of these, the knowledge and skills enabling that person to perform the task required.3.3inspection bodya body responsible for inspection, which may cover one or more of the following: (a)design verification.(b)fabrication inspection.(c)in-service inspection.3.4inspectora person able to inspect pressure equipment for the purposes of conformity with the specified requirements. standards a.au4material4.1steelmaking processthe steel shall be made by the open hearth, basic oxygen, or an electric process, and shall be continuously cast. production by the use of ingots is acceptable provided the steel isfully killed. rimmed steels shall not be used for arc welded components.note: rimmed steels are considered not suitable for arc welded components because of problems associated with the welding of the slit edge due to the possibility of lamination and segregation problems.4.2carbon steel4.2.1cylindrical section and endscast analysisthe cast analysis shall conform to table 1, except that where resistance-welded attachments are to be added to the cylinder the maximum carbon content of the pressure retainingportion of the joint shall be 0.15%.table1cast analysiselements (other than iron) carbon 0.25manganesesilicon 0.40micro-alloying elements (total) sulfur 0.040phosphorus 0.040cast analysis (max.), percent1.700.15notes:1 grain-refiningelements, i.e.titanium(up to 0.040%) andaluminium(up to 0.1%), may be added.2examples of micro-alloying elements are titanium (where greater than 0.040%), niobium and vanadium.3as/nzs 1594 and equivalent overseas standards specify some acceptable grade of steel with conforming cast analyses.4residual elements up to the following individual amounts or a sum of 0.7% of all listed elements are considered to be incidental:chromium . 0.30%. copper . 0.35%. molybdenum . 0.10%. nickel . 0.35%residual elementselements not shown in table 1 shall not be intentionally added to the steel, other than for the purpose of finishing the heat.all reasonable precautions shall be taken to prevent the addition of such elements during manufacture, and the quantities present shall not be detrimental to the application of steel for a welded gas cylinder.weldabilitythe steel shall be of a weldable quality.the standard is downloaded from standard sharingmechanical propertieswhen a completed gas cylinder is tested in accordance with clause 9.3, the yield and tensilestrength values obtained shall be not less than the values used in the equations inclause 5.1.1.when determined in accordance with clause 9.3, the elongation shall be not less than 20% minus one percentage unit for each increment of 50 mpa by which the measured tensile strength exceeds 350 mpa, but in any case not less than 16%.4.2.2attachmentsattachments shall be of steel complying with the requirements of clause 4.1, except that for resistance-welded attachments the steel of both components of the joint shall be weldable and be subject to a maximum carbon content of 0.15%.4.3stainless steel4.3.1cylindrical section and endscast analysisthe cast analysis shall comply with the chemical composition requirements of grades304/304 l or 316/316 l as specified in astm a240/a240m and astm a480/a480m, except that the maximum carbon content shall not exceed 0.05%.test certificatestest certificates shall be provided by the stainless steel supplier, with each completed order to indicate the material and mechanical properties of the stainless steel supplied.for temper rolled stainless steel, tensile specimens shall be taken from both ends of each coil. for test certificate purposes, all specimens shall be taken at a sufficient distance from coil ends in order to be fully representative of the coil.mechanical propertiesall tests specified in section 9 are required. when a completed cylinder is tested in accordance with clause 9.3 of this standard, the yield and tensile strength values obtained shall not be less than those values used in the equations in clause 5.1.1 of this standard.when determined in accordance with clause 9.3 of this standard, the elongation shall be not less than 20% minus one percentage unit for each increment of 50 mpa by which the measured tensile strength exceeds 350 mpa, but in any case not less than 16%.intergranular corrosion teststhese intergranular corrosion tests shall comply with the requirements of as 2038. for welded variables, materials and welding procedures shall be qualified by testing a specimen from a least one cylinder randomly selected from each batch of 200 cylinders or part batch thereof.test pieces shall be prepared to provide representative weld metal and heat affected parent metal for each of the following:(a)t-joint of the longitudinal and a circumferential joint. (b)longitudinal joint.(c)pad or boss attachment weld.(d)representative attachment welds of any attachment described in clause 4.3.2.at least one of the test pieces shall be taken from the position of maximum heat input and maximum number of runs.test pieces may be taken from cylinders used for other tests provided these other tests on the cylinder have been completed with successful results.4.3.2attachmentsattachments, including fittings, data plates, lugs, handles, valve guards and footrings, shallbe of stainless steel complying with grades 304/304l or 316/316l of astm a 240/240m,astm a276 and astm a480/a480m.5design and construction5.1minimum thickness5.1.1cylindrical portions of shell (not including any part of the ends)the thickness of the cylindrical portion shall be not less than 1.75 mm for carbon steel andnot less than 1.5 mm for stainless steel, nor less than the greater of those calculated fromthe following equations:t= 2.5(di/rm)1/2. . . 5.1.1(1)t=(p *d )/(2f + p ). . . 5.1.1(2)hohwherehtdi=minimum finished thickness of the cylinder, in millimetresnominal internal diameter, in millimetresdo=nominal outside diameter of cylindrical section, in millimetresph=test pressure (the design test pressure specified in as 2030.1), in megapascalsf=for carbon steel maximum permissible stress, to be taken as 90% of theminimum yield strength of the steel, but not exceeding 60% of the minimumtensile strength of the steel, in megapascals. for calculation purposes, amaximum value for f of 320 mpa shall apply, for carbon steel=for stainless steel maximum permissible stress, to be taken as 90% of theminimum yield strength of the steel, but not exceeding 53% of the minimumtensile strength of the steel, in megapascals. for calculating purposes, amaximum value for f of 360 mpa shall apply for stainless steelrm=minimum tensile strength of the steel, in megapascalsnote: minimum yield strength and minimum tensile strength are those valuesdetermined in accordance with clause 9.3, i.e. following the forming and heattreatment.=efficiency of the welded joint=0.75, where no radiography carried out=0.9, where samples are selected from each batch for spot radiography asspecified in clause 7.1.2(b)=1.0, where the longitudinal weld and t-joint are fully radiographed for everycylinder as specified in clause 7.1.2(a)the standard is downloaded from standard sharing5.1.2endsthe minimum thickness of ends after forming shall be as follows:(a)other than where thinning has occurred in the forming operation(s), the greater of the thickness given in items (i) and (ii) as follows:(i)calculated from the equations from clause 5.1.1, where the factor is taken toequal 1.0.(ii)not less than 1.75 mm.(b)where thinning has occurred in the formed portion of the end owing to the forming operation(s), the minimum thickness at that thinned section shall be not less than 90% of the thickness established in item (a).5.2form of endsends shall be concave to pressure, and shall have either spherical form or ellipsoidal form(see figure 1).the ends shall have a cylindrical portion of length not less than four times the minimum thickness.the ellipsoidal form shall be of not more than 2 to 1 ratio at the internal surface, i.e. the internal height of the end is 25% of the internal diameter. a template of true form shall be used internally or externally to check the deviation from the true form. any deviation measured perpendicular to the surface shall