1、Designation: A733 15Standard Specification forWelded and Seamless Carbon Steel and Austenitic StainlessSteel Pipe Nipples1This standard is issued under the fixed designation A733; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the
2、 year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the U.S. Department of Defense.1. Scope*1.1 This specification cov
3、ers the requirements for weldedand seamless carbon steel pipe nipples, black and zinc-coated(hot-dip galvanized), and welded and seamless austeniticstainless steel pipe nipples in standard steel pipe sizes from18to 12 in. inclusive, in standard or special lengths.1.1.1 Welded Carbon SteelPipe nipple
4、s ordered underthese requirements are intended for general uses, as describedby Specification A53/A53M or for low-temperature service asdescribed by Specification A333/A333M.1.1.2 Seamless Carbon SteelPipe nipples ordered underthese requirements are intended for general and special uses, asdescribed
5、 by the applicable Specifications A53/A53M andA106/A106M or for low temperature service as described bySpecification A333/A333M (see 4.1.1).1.1.3 Austenitic Stainless SteelPipe nipples ordered underthese requirements are intended for high-temperature andgeneral corrosion service, as described by Spe
6、cification A312/A312M (see 4.1.2).1.1.4 The text for this specification contains notes orfootnotes, or both, that provide explanatory material. Suchnotes and footnotes, excluding those in tables, do not containany mandatory language.1.2 The values stated in inch-pound units are to be regardedas stan
7、dard. The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.2. Referenced Documents2.1 ASTM Standards:2A53/A53M Specification for Pipe, Steel, Black and Hot-Dipped, Zinc-Coated, Welded and SeamlessA106/A106M Spec
8、ification for Seamless Carbon Steel Pipefor High-Temperature ServiceA312/A312M Specification for Seamless, Welded, andHeavily Cold Worked Austenitic Stainless Steel PipesA333/A333M Specification for Seamless and Welded SteelPipe for Low-Temperature Service and OtherApplicationswith Required Notch To
9、ughness2.2 American National Standards Institute Standards:3B1.20.1 Pipe Threads, General PurposeB36.10 Standard for Welded and Seamless Wrought SteelPipeB36.19 Standard for Stainless Steel Pipe3. Ordering Information3.1 Information items to be considered, if appropriate, forinclusion in purchase or
10、ders are as follows:3.1.1 Quantity (pieces),3.1.2 Name of material (carbon steel or austenitic stainlesssteel pipe nipples) (see 4.1.1 and 4.1.2),3.1.2.1 Carbon steel applications should identify low-temperature or high-temperature service, if applicable.3.1.3 Method of pipe manufacture (continuous-
11、welded,electric-resistance welded, or seamless) (see 4.1.1, Note 1),3.1.4 Type and grade (if stainless steel),3.1.5 Finish (carbon steel, black or galvanized),3.1.6 Size (nominal and weight class or schedule number asshown in Table 1, or outside diameter and nominal wall),3.1.7 Length (standard or s
12、pecial, see 4.3),3.1.8 Specification number,3.1.9 Certification of compliance, if required, and3.1.10 Special requirements or exceptions to this specifica-tion.3.2 In addition, when material is purchased for agencies ofthe U.S. Government, it shall conform to the SupplementaryRequirements as defined
13、 herein when specified in the contractor purchase order.1This specification is under the jurisdiction of ASTM Committee A01 on Steel,Stainless Steel and Related Alloys and is the direct responsibility of SubcommitteeA01.09 on Carbon Steel Tubular Products.Current edition approved Sept. 1, 2015. Publ
14、ished September 2015. Originallyapproved in 1976. Last previous edition approved in 2013 as A733 13. DOI:10.1520/A0733-15.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, ref
15、er to the standards Document Summary page onthe ASTM website.3Available from American National Standards Institute (ANSI), 25 W. 43rd St.,4th Floor, New York, NY 10036, http:/www.ansi.org.*A Summary of Changes section appears at the end of this standardCopyright ASTM International, 100 Barr Harbor D
16、rive, PO Box C700, West Conshohocken, PA 19428-2959. United States14. Requirements4.1 Material and WeightPipe nipples covered by thisspecification shall be made from new, hydrostatic-tested orNDE-tested pipe conforming to the requirements specified in4.1.1 and 4.1.2.4.1.1 Carbon SteelCarbon steel pi
17、pe nipples shall be inaccordance with the following:Method of Pipe Manufacture SpecificationWelded (Note 1) A53/A53MA333/A333MSeamless (Note 2) A53/A53MA106A333/A333MNOTE 1Unless otherwise specified, continuouswelded nipples arefurnished in sizes NPS 4 and under for standard and extra strong pipe, a
18、ndNPS 212 and under for Schedule 160 and double extra strong pipe. Weldednipples in sizes larger than that indicated for continuouswelded areelectric resistance welded.4.1.2 Austenitic Stainless SteelAustenitic stainless steelpipe nipples shall be in accordance with Specification A312/A312M.4.2 Thre
19、adsPipe nipples shall be threaded on both endswith NPT taper pipe threads conforming to the requirements ofANSI B 1.20.1, except for “close” nipples where L 4 and V areshorter, due to fewer imperfect threads. It is standard manu-facturing practice on all other nipple lengths to vary L 4 plus orminus
20、 two threads. All other dimensions, tolerances, andgaging practices remain the same asANSI B 1.20.1, plus 5.3 ofthis specification.4.2.1 Threads shall be right-hand on both ends, except whenotherwise specified.4.3 Lengths:TABLE 1 Pipe Nipple Sizes According to Weight of Nominal PipeSizesABWeightNPS
21、Designator18143812 to 6 8 10 12Standard (Schedule 40) XXXXXXCExtra strong (Schedule80)XXXXXDCSchedule 160 . . . XXXXDouble extra strong . . . XXXXAA comprehensive listing of standardized pipe dimensions is contained in ANSIB36.10 and B36.19.BContinuous-welded pipe is not made in sizes larger than NP
22、S 4 (standard andextra strong) and larger than NPS 212 (Schedule 160 and double extra strong).CNPS 12 standard and extra strong weight pipe do not have designated schedulenumbers.DNPS 10 extra strong pipe is Schedule 60, not Schedule 80.TABLE 2 Pipe Nipples by Length and Nominal Pipe SizeType of Nip
23、ple NPS Designator1814381234 1114 112 2212 3312 45681012Pipe Nipple Lengths, in.ABClose (cl)3478 1118 138 112 158 134 2212 258 234 278 3318 312 378 412112 112 112 112 11222222222212 212 212 212 212 212 212 212 21233333333 333312 312 312 312 312 312 312 3312 312 31244444444 44444412 412 412 412 412 4
24、12 412 412 412 412 412 412 412 412 41255555555 555555555512 512 512 512 512 512 512 512 512 512 512 512 512 512 512 512 51266666666 666666666677777777 777777777788888888 888888888899999999 999999999910 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 1011 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11
25、11 1112 12 12 12 12 12 12 12 12 12 12 12 12 12 12 12 12 1213 13 13 13 13 13 13 13 13 13 13 13 13 13 13 13 13 1314 14 14 14 14 14 14 14 14 14 14 14 14 14 14 14 14 1415 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 1516 16 16 16 16 16 16 16 16 16 16 16 16 16 16 16 16 1617 17 17 17 17 17 17 17 17 17
26、17 17 17 17 17 17 17 1718 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 1819 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 1920 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 2021 21 21 21 21 21 21 21 21 21 21 21 21 21 21 21 21 2122 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 22 2223 23 23 23
27、23 23 23 23 23 23 23 23 23 23 23 23 23 2324 24 24 24 24 24 24 24 24 24 24 24 24 24 24 24 24 24Rightandleft. . 444444 444. . . . . . .ANipples shorter than close are not recommended for pressure application.B1 in. = 25.4 mm.A733 1524.3.1 The standard lengths and sizes of nipples generallyavailable ar
28、e shown in Table 2. The availability of such nipplesaccording to pipe size and weight is shown in Table 1.4.3.2 Special lengths and sizes of nipples may be specifiedwhen required. Standard and special lengths shall conform tothe tolerance requirements of 4.3.3.4.3.3 Nipples with lengths up through 1
29、2 in. (304.8 mm)long shall have a length tolerance of 6116 in. (1.6 mm).Nipples over 12 in. long shall have a tolerance of 618 in. (3.2mm).4.4 End FinishThe ends of the pipe nipples shall bechamfered on the outside at an angle of 35 6 10 to the centralaxis. (It is the standard practice that the18-in
30、. (3.2-mm)nominal pipe size nipples are not chamfered.) Ends shall be cutreasonably square to the central axis. All burrs on the insideshall be removed.4.5 Galvanized NipplesGalvanized nipples ordered underthis specification shall be made from pipe coated on the insideand outside by the hot-dip proc
31、ess. Threads and nipple ends arenot galvanized.5. Sampling and Inspection5.1 SamplingSamples of nipples sufficient to determinetheir conformance with the requirements of this specificationshall be taken at random for each lot of nipples of the samepipe size, length, and material.5.2 InspectionThe sa
32、mples shall be inspected to deter-mine their conformance with the dimensional requirements,including thread dimensions and finish of this specification.5.3 Gaging Techniques for Male Threads:5.3.1 An NPT working ring gage, in accordance with ANSIB1.20.1, shall be turned hand tight on the nipple thre
33、ads. Thegage shall be tapped or rapped against a solid surface and thegage again turned hand tight into the thread. Hand tight meansturning the gage until moderate resistance is encountered; noexcessive force shall be used. After the second tighteningoperation, the end of the thread should be flush
34、to the gageface, plus or minus one turn.5.3.2 The reference point for gaging is the end of the threadprovided the chamfer is not smaller than the minor diameter ofthe external thread. When a chamfer on the external threadexceeds this limit, the reference point becomes the last threadscratch on the c
35、hamfer cone.5.3.3 The usual technique for tapping or rapping the gage isto swing the end of the fitting with the ring gage attachedthrough an arc of approximately 4 to 6 in. (100 to 150 mm) toallow the gage to strike against a solid metal surface. Thistapping procedure is used to eliminate any bindi
36、ng due to slightnicks or foreign matter in the threads.NOTE 2Any mechanical device that simulates the gage tapping orrapping to achieve the same results is also permitted.TABLE 3 Dash Numbers for Standard and Extra Strong Steel Pipe NipplesNOMINAL PIPE SIZE1814381234 11-14 1-12 22-12 3456A OUTSIDE D
37、IA., in.A.405 .540 .675 .840 1.05 1.31 1.660 1.900 2.375 2.875 3.500 4.500 5.563 6.62505B THICKNESS:, in.A(STANDARD) .068 .088 .091 .109 .113 .133 .140 .145 .154 .203 .216 .237 .258 .280(EXTRA STRONG) .095 .119 .126 .147 .154 .179 .191 .200 .218 .276 .300 .337 .375 .432L LENGTH 116 IN.ADASH NUMBERS3
38、4A178B251B491-18B731-38B971-12C6C29C52C75B1211-58B1451-34B1692 9 32 55 78C101C124B1932-12 10 33 56 79 102 125C148C171C194B2173 11 34 57 80 103 126 149 172 195C218C2413-12 12 35 58 81 104 127 150 173 196 219 2424 13 36 59 82 105 128 151 174 197 220 2434-12 14 37 60 83 106 129 152 175 198 221 244C290C
39、3135 15 38 61 84 107 130 153 176 199 222 2455-12 16 39 62 85 108 131 154 177 200 223 2466 17 40 63 86 109 132 155 178 201 224 247 270 3167 18 41 64 87 110 133 156 179 202 225 2488 19 42 65 88 111 134 157 180 203 226 2499 20 43 66 89 112 135 158 181 204 227 25010 21 44 67 90 113 136 159 182 205 228 2
40、5111 22 45 68 91 114 137 160 183 206 229 25212 23 46 69 92 115 138 161 184 207 230 253Notes:A1 in. = 25.4 mmBClose type nipplesCShort (shoulder) type nipplesFIG. 1 Standard and Extra Strong Steel Pipe NipplesA733 1535.4 The inspector representing the purchaser shall haveentry, at all times while wor
41、k on the contract of the purchaseris being performed, to all parts of the manufacturers worksthat concern the manufacture of the nipples ordered. Themanufacturer shall afford the inspector all reasonable facilitiesto satisfy him that the nipples are being furnished in accor-dance with this specifica
42、tion. Inspection shall be made at theplace of manufacture prior to shipment, unless otherwisespecified, and shall be so conducted as not to interfereunnecessarily with the operation of the works.6. Rejection6.1 Each nipple that fails to meet the requirement of thisspecification shall be rejected, an
43、d the manufacturer notified.7. Certification7.1 When requested at the time the order is placed, themanufacturer shall provide certification that the nipples complyto all the requirements of this specification.7.2 The nipple manufacturer shall maintain a record on pipemill test report certifications.
44、8. Identification and Packaging8.1 Individual nipples are not normally identified. Packagednipples shall have their containers legibly marked to show thebrand or name of manufacturer, size, length, quantity, methodof pipe manufacture, type and grade of material (if other thancarbon steel), ASTM A733
45、, and finish.8.2 At manufacturers option, large size, extra long nipples,and odd lots are bagged or bundled with tags identifying theproduct in accordance with 8.1.9. Keywords9.1 carbon steel fittings; pipe fittings; pipe nipples; stainlesssteel fittingsSUPPLEMENTARY REQUIREMENTSThe following supple
46、mentary requirements shall apply only when specified by the purchaser in theinquiry, contract, or order, for agencies of the U.S. Government.S1.1 Part Numbering SystemThis supplement provides apart numbering system for identification of standard items forgovernment use of Specification A733. (See al
47、so Table 3 andFig. 1).NOTE S1.1The government encourages the general use of this partnumbering system to achieve maximum parts standardization.S1.2 The part number consists of the document identifierfollowed by the code for the weight of material (standard orextra strong), a dash, dash number, mater
48、ial code, method ofmanufacture code, and finish code (see example).S1.2.1 ExamplePart Identifying Number“A733S198CFB” is constructed as follows in Fig. S1.1:FIG. S1.1 Construction of Part Identifying NumberA733 154SUMMARY OF CHANGESCommittee A01 has identified the location of selected changes to thi
49、s standard since the last issue (A73313)that may impact the use of this standard. (Approved September 1, 2015)(1) Added low-temperature service product to the Scope, andSections 2, 3, and 4.ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the
