1、Designation: A795/A795M 08 (Reapproved 2012)Standard Specification forBlack and Hot-Dipped Zinc-Coated (Galvanized) Welded andSeamless Steel Pipe for Fire Protection Use1This standard is issued under the fixed designation A795/A795M; the number immediately following the designation indicates the yea
2、rof original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval.A superscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope*1.1 This specification covers black and hot-dipped galva-n
3、ized welded and seamless steel pipe in NPS 1/2 to NPS 10,inclusive DN 15 to DN 250, inclusive (Note 1), with wallthicknesses as given in Table 1 and Table 2. Pipe having otherwall thicknesses may be furnished provided such pipe complieswith all other requirements of this specification and the outsid
4、ediameter is as given in Table 2. Pipe ordered under thisspecification is intended for use in fire protection systems. Thepipe may be bent, but it is not intended for bending made atambient temperature wherein the inside diameter of the bend isless than twelve times the outside diameter of the pipe
5、beingbent (Note 2).NOTE 1The dimensionless designators NPS (nominal pipe size) andDN (nominal diameter) have been substituted in this standard for suchtraditional terms as “nominal diameter,” “size,” and “nominal size.”NOTE 2Successful bending of pipe is a function of equipment andtechnique as well
6、as pipe properties.1.2 This pipe is suitable for joining by the followingmethods:1.2.1 Light-Weight Fire Protection Pipe Rolled groove,welding, and fittings for plain end pipe. See Table 1 fordimensions.1.2.2 Standard-Weight Fire Protection PipeCut or rolledgroove, threading, welding, and fittings f
7、or plain end pipe. SeeTable 2 for dimensions.1.2.3 For pipe having dimensions other than those of Table1 and Table 2, the joining method must be compatible with thepipe dimensions. A complete listing of standard light weightdimensions appears in ASME B36.10 and B36.19.1.3 The following safety hazard
8、s caveat pertains only to thetest method portion, Sections 8, 9, and 10, of this specification:This standard does not purport to address all of the safetyconcerns, if any, associated with its use. It is the responsibilityof the user of this standard to establish appropriate safety andhealth practice
9、s and determine the applicability of regulatorylimitations prior to use.1.4 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard. Within the text, theSI units are shown in brackets. The values stated in eachsystem may not be exact equivalents; therefore,
10、each systemshall be used independently of the other. Combining valuesfrom the two systems may result in non-conformance with thestandard.2. Referenced Documents2.1 ASTM Standards:2A90/A90M Test Method for Weight Mass of Coating onIron and Steel Articles with Zinc or Zinc-Alloy CoatingsA700 Practices
11、 for Packaging, Marking, and Loading Meth-ods for Steel Products for ShipmentA751 Test Methods, Practices, and Terminology for Chemi-cal Analysis of Steel ProductsA865 Specification for Threaded Couplings, Steel, Black orZinc-Coated (Galvanized) Welded or Seamless, for Use inSteel Pipe JointsB6 Spec
12、ification for ZincE213 Practice for Ultrasonic Testing of Metal Pipe andTubingE309 Practice for Eddy-Current Examination of Steel Tubu-lar Products Using Magnetic SaturationE570 Practice for Flux Leakage Examination of Ferromag-netic Steel Tubular Products2.2 ASME Standards:B1.20.1 Pipe Threads, Gen
13、eral Purpose, Inch3B36.10 Welded and Seamless Wrought Steel Pipe3B36.19 Stainless Steel Pipe32.3 Federal Standard:Fed. Std. No. 123 Marking for Shipments (Civil Agencies)41This specification is under the jurisdiction of ASTM Committee A01 on Steel,Stainless Steel and Related Alloys and is the direct
14、 responsibility of SubcommitteeA01.09 on Carbon Steel Tubular Products.Current edition approved Sept. 1, 2012. Published November 2012. Originallyapproved in 1982. Last previous edition approved in 2008 as A795/A795M08.DOI: 10.1520/A0795_A0795M-08R12.2For referenced ASTM standards, visit the ASTM we
15、bsite, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3Available from American Society of Mechanical Engineers (ASME), ASMEInternational Headquarters, Three Park Av
16、e., New York, NY 10016-5990, http:/www.asme.org.4Available from Standardization Documents Order Desk, Bldg. 4 Section D, 700Robbins Ave., Philadelphia, PA 19111-5094, Attn: NPODS.*A Summary of Changes section appears at the end of this standardCopyright ASTM International, 100 Barr Harbor Drive, PO
17、Box C700, West Conshohocken, PA 19428-2959. United States12.4 Military Standards:MIL-STD-129 Marking for Shipment and Storage4MIL-STD-163 Steel Mill Products, Preparation for Ship-ment and Storage43. Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 defectan imperfection of suffici
18、ent size or magni-tude to be cause for rejection.3.1.2 imperfectionany discontinuity or irregularity foundin the pipe.4. Classification4.1 Pipe may be furnished in the following types (Note 3):4.1.1 Type FFurnace-butt welded, continuous welded,4.1.2 Type EElectric-resistance-welded, or4.1.3 Type SSe
19、amless.NOTE 3See Annex A1 for definitions of the types of pipe.5. Ordering Information5.1 Orders for material under this specification shouldinclude the following, as required, to describe the desiredmaterial adequately:5.1.1 Quantity (feet, metres, or number of lengths),5.1.2 Name of material (stee
20、l pipe),5.1.3 Type (seamless, electric-resistance-welded, orfurnace-welded),5.1.4 Grade (seamless and electric-resistance-welded only),5.1.5 Size (NPS or DN designator and weight class; stan-dard weight or light weight; or outside diameter) and wallthickness (Table 1 and Table 2),5.1.6 Finish (black
21、, galvanized, or other type of coating asspecified by the purchaser),5.1.7 Length (specific or random),TABLE 1 Dimensions, Weights, and Test Pressure For Light-Weight Fire Protection PipeSchedule 10ANPSDesignatorDNDesignatorOutside Diameter Nominal Wall Thickness Weight Plain EndTest PressureFurnace
22、-WeldedSeamless andElectric-Resistance-Weldedin. mm in. mm lb/ft kg/m psi kPa psi kPa34 20 1.050 26.7 0.083 2.11 0.86 1.28 500 3400 700 48001 25 1.315 33.4 0.109 2.77 1.41 2.09 500 3400 700 4800114 32 1.660 42.2 0.109 2.77 1.81 2.69 500 3400 1000 6900112 40 1.900 48.3 0.109 2.77 2.09 3.11 500 3400 1
23、000 69002 50 2.375 60.3 0.109 2.77 2.64 3.93 500 3400 1000 6900212 65 2.875 73.0 0.120 3.05 3.53 5.26 500 3400 1000 69003 80 3.500 88.9 0.120 3.05 4.34 6.46 500 3400 1000 6900312 90 4.000 101.6 0.120 3.05 4.98 7.41 500 3400 1200 83004 100 4.500 114.3 0.120 3.05 5.62 8.37 500 3400 1200 83005 125 5.56
24、3 141.3 0.134 3.40 7.78 11.58BB1200 83006 150 6.625 168.3 0.134 3.40 9.30 13.85 1000 69008 200 8.625 219.1 0.188C4.78 16.96 25.26BB800 550010 250 10.750 273.1 0.188C4.78 21.23 31.62 700 4800ASchedule 10 corresponds to Schedule 10S as listed in ANSI B36.19 for NPS34 through 6 DN 20 through 150 only.B
25、Furnace-welded pipe is not made in sizes larger than NPS 4 DN 100.CNot Schedule 10.TABLE 2 Dimensions, Weights, Test Pressures For Standard-Weight Fire Protection PipeSchedule 30 and Schedule 40NPSDesignatorDNDesignatorSpecified OutsideDiameterNominal WallThicknessAWeight Plain EndWeight Threadedand
26、 CoupledBTest PressureFurnace-WeldedSeamless andElectric-Resistance-Weldedin. mm in. mm lb/ft kg/m lb/ft kg/m psi kPa psi kPa12 15 0.840 21.3 0.109 2.77 0.85 1.27 0.85 1.27 700 4800 700 480034 20 1.050 26.7 0.113 2.87 1.13 1.69 1.13 1.68 700 4800 700 48001 25 1.315 33.4 0.133 3.38 1.68 2.50 1.68 2.5
27、0 700 4800 700 4800114 32 1.660 42.2 0.140 3.56 2.27 3.39 2.28 3.40 1000 6900 1000 6900112 40 1.900 48.3 0.145 3.68 2.72 4.05 2.73 4.07 1000 6900 1000 69002 50 2.375 60.3 0.154 3.91 3.66 5.45 3.69 5.50 1000 6900 1000 6900212 65 2.875 73.0 0.203 5.16 5.80 8.64 5.83 8.68 1000 6900 1000 69003 80 3.500
28、88.9 0.216 5.49 7.58 11.29 7.62 11.35 1000 6900 1000 6900312 90 4.000 101.6 0.226 5.74 9.12 13.58 9.21 13.71 1200 8300 1200 83004 100 4.500 114.3 0.237 6.02 10.80 16.09 10.91 16.25 1200 8300 1200 83005 125 5.563 141.3 0.258 6.55 14.63 21.79 14.82 22.07CC1200 83006 150 6.625 168.3 0.280 7.11 18.99 28
29、.29 19.20 28.60 1200 83008 200 8.625 219.1 0.277A7.04 24.72 36.82 25.57 38.09CC1200 830010 250 10.750 273.1 0.307A7.80 34.27 51.05 35.78 53.29 1000 6900ANPS12 through 6 DN 15 through 150Schedule 40; NPS 8 and 10 DN 200 and 250Schedule 30.BBased on 20-ft 6.1-m lengths.CFurnace-welded pipe is not made
30、 in sizes larger than NPS 4 DN 100.A795/A795M 08 (2012)25.1.7.1 Grade for Type E and Type S,5.1.8 End finish,5.1.8.1 Plain end, square cut,5.1.8.2 Plain end, beveled,5.1.8.3 Cut groove (Note 4),5.1.8.4 Rolled groove (Note 4),5.1.8.5 Threads only,5.1.8.6 Threaded and coupled, and5.1.8.7 Couplings pow
31、er tight.NOTE 4Type of groove specified by the purchaser.5.1.9 ASTM designation.6. Materials and Manufacture6.1 The steel for both welded and seamless pipe shall bemade by one or more of the following processes: open-hearth,electric-furnace, or basic-oxygen.6.2 Welded pipe NPS 4 DN 100 and under may
32、 befurnace-welded or electric-resistance welded. Welded pipeover NPS 4 DN 100 shall be electric-resistance-welded.6.3 The weld seam of electric-resistance-welded pipe inGrade B shall be heat treated after welding to a minimum of1000 F 540 C so that no untempered martensite remains, orotherwise proce
33、ssed in such a manner that no untemperedmartensite remains.7. Chemical Composition7.1 The steel shall conform to the requirements as tochemical composition specified in Table 3.7.2 An analysis of two pipes from each lot of 500 lengths,or fraction thereof, may be made by the purchaser. Thechemical co
34、mposition thus determined shall conform to therequirements specified in Table 3.7.3 Methods, practices, and definitions for chemical analy-sis shall be in accordance with Test Methods, Practices, andTerminology A751.7.4 If the analysis of either pipe does not conform to therequirements specified in
35、Table 3, analyses shall be made onadditional pipes of double the original number from the samelot, each of which shall conform to the requirements specifiedin Table 3.8. Hydrotest8.1 Each length of pipe shall be subjected to a hydrostatictest by the manufacturer. The minimum test pressure shall be a
36、sprescribed in Table 1 and Table 2. This does not prohibit testingat a higher pressure at the manufacturers option. The manu-facturer may apply the hydrostatic test to pipe with plain ends,with threads only, or with threads and couplings. The hydro-static test may be applied to single or multiple le
37、ngths.8.2 The hydrostatic test shall be applied, without leakagethrough the pipe wall, to each length of pipe.NOTE 5The hydrostatic test pressures given herein are inspection testpressures. They are not intended as a basis for design and do not have anydirect relationship to working pressures.9. Non
38、destructive Electric Test9.1 As an alternative to the hydrostatic test, and whenaccepted by the purchaser, test each pipe with a nondestructiveelectric test in accordance with Practice E213, Practice E309,or Practice E570. It is the intent of this test to reject pipecontaining defects.9.2 The follow
39、ing information is for the benefit of the userof this specification:9.2.1 The ultrasonic examination referred to in this specifi-cation is intended to detect longitudinal discontinuities havinga reflective area similar to or larger than the reference notch.The examination may not detect circumferent
40、ially orientedimperfections or short, deep defects.9.2.2 The eddy-current examination referenced in thisspecification has the capability of detecting significantdiscontinuities, especially of the short, abrupt type.9.2.3 The flux leakage examination referred to in thisspecification is capable of det
41、ecting the presence and locationof significant longitudinally or transversely oriented disconti-nuities. The provisions of this specification only requirelongitudinal calibration for flux leakage. Different techniquesneed to be employed for the detection of differently orientedimperfections.9.2.4 Th
42、e hydrostatic test referred to in Section 8 is a testmethod provided for in many product specifications. This testhas the capability of finding defects of a size permitting the testfluid to leak through the tube wall and may be either visuallyseen or detected by a loss of pressure. This test may not
43、 detectvery tight, through-the-wall defects or defects that extend anappreciable distance into the wall without complete penetra-tion.9.2.5 Apurchaser interested in ascertaining the nature (type,size, location, and orientation) of discontinuities that can bedetected in the specific application of th
44、ese examinationsshould discuss this with the manufacturer of the tubularproduct.9.3 In order to accommodate the various types of nonde-structive electric testing equipment and techniques in use, thecalibration tube shall contain, at the option of the producer, anyone or more of the following discont
45、inuities to establish aminimum sensitivity level for rejection.9.3.1 Drilled HoleDrill a hole radially and completelythrough the pipe wall, care being taken to avoid distortion ofthe pipe while drilling. The diameter of the hole shall not belarger than 0.031 in. 0.8 mm for pipe under 0.125 in. 3.2mm
46、 in wall thickness, not larger than 0.0625 in. 1.6 mm forpipe between 0.125 in. 3.2 mm and 0.200 in. 5.0 mm in wallTABLE 3 Chemical RequirementsComposition, max, %CMnP SType E (electric-resistance-welded pipe) otherwise the length shall be rejected. For pipe produced inmultiple lengths, retests may
47、be cut from each end of eachindividual length in the multiple. Such tests shall be made withthe weld alternately 0 and 90 from the line of direction offorce. Each length that exhibits failure shall be rejected.18. Inspection18.1 The inspector representing the purchaser shall havefree entry at all ti
48、mes while work is being performed, to allparts of the manufacturers works that concern the manufactureof the material ordered. The manufacturer shall afford theinspector all reasonable facilities to satisfy him that thematerial is being furnished in accordance with this specifica-tion. All tests (except product analysis) and inspection shall bemade at the place of manufacture prior to shipment, unlessotherwise specified, and shall be so conducted as not tointerfere unnecessarily with the operation of the works.18.2 For Government Pro
