1、Designation: A 795/A 795M 07Standard Specification forBlack and Hot-Dipped Zinc-Coated (Galvanized) Welded andSeamless Steel Pipe for Fire Protection Use1This standard is issued under the fixed designationA 795/A 795M; the number immediately following the designation indicates the yearof original ad
2、option or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval.A superscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope*1.1 This specification covers black and hot-dipped galva-nized welded an
3、d 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 outsidediameter is a
4、s 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 beingbent (Not
5、e 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 as pipe proper
6、ties.1.2 This pipe is suitable for joining by the followingmethods:1.2.1 Light-Weight Fire Protection PipeRolled 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 for plain end pi
7、pe. 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 hazards caveat pertai
8、ns 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 practices and determine
9、 the applicability of regulatorylimitations prior to use.1.4 The values stated in either inch-pound units or SI unitsare to be regarded separately as standard. Within the text, theSI units are shown in brackets. The values stated in eachsystem are not exact equivalents; therefore, each system mustbe
10、 used independently of the other. Combining values from thetwo systems may result in nonconformance with the specifi-cation.2. Referenced Documents2.1 ASTM Standards:2A 90/A 90M Test Method for Weight Mass of Coating onIron and Steel Articles with Zinc or Zinc-Alloy CoatingsA 700 Practices for Packa
11、ging, Marking, and LoadingMethods for Steel Products for ShipmentA 751 Test Methods, Practices, and Terminology forChemical Analysis of Steel ProductsA 865 Specification for Threaded Couplings, Steel, Blackor Zinc-Coated (Galvanized) Welded or Seamless, for Usein Steel Pipe JointsB6 Specification fo
12、r ZincE 213 Practice for Ultrasonic Examination of Metal Pipeand TubingE 309 Practice for Eddy-Current Examination of Steel Tu-bular Products Using Magnetic Saturation2.2 ASME Standards:B1.20.1 Pipe Threads, General Purpose, Inch3B36.10 Welded and Seamless Wrought Steel Pipe3B36.19 Stainless Steel P
13、ipe32.3 Federal Standard:Fed. Std. No. 123 Marking for Shipments (Civil Agencies)42.4 Military Standards:MIL-STD-129 Marking for Shipment and Storage4MIL-STD-163 Steel Mill Products, Preparation for Ship-ment and Storage41This specification is under the jurisdiction of ASTM Committee A01 on Steel,St
14、ainless Steel and Related Alloys and is the direct responsibility of SubcommitteeA01.09 on Carbon Steel Tubular Products.Current edition approved July 1, 2007. Published August 2007. Originallyapproved in 1982. Last previous edition approved in 2004 as A 795/A 795M04.2For referenced ASTM standards,
15、visit the ASTM website, 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 Headquarte
16、rs, Three Park Ave., 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.1*A Summary of Changes section appears at the end of this standard.Copyright ASTM International, 100 Bar
17、r Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.3. Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 defectan imperfection of sufficient size or magni-tude to be cause for rejection.3.1.2 imperfectionany discontinuity or irregularity foundin the pipe.4.
18、 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 SSeamless.NOTE 3See Annex A1 for definitions of the types of pipe.5. Ordering Information5.1 Orders for material under this
19、 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 (steel pipe),5.1.3 Type (seamless, electric-resistance-welded, orfurnace-welded),5.1.4 Grade (seamless and electric-resistanc
20、e-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, galvanized, or other type of coating asspecified by the purchaser),5.1.7 Length (specific or random),5.1.7.1 Grade for
21、 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 power tight.TABLE 1 Dimensions, Weights, and Test Pressure For Light-Weight
22、Fire Protection PipeSchedule 10ANPSDesignatorDNDesignatorOutside Diameter Nominal Wall Thickness Weight Plain EndTest PressureFurnace-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
23、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 1000 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 1
24、000 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 5.563 141.3 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.
25、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.BFurnace-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 Pipe
26、Schedule 30 and Schedule 40NPSDesignatorDNDesignatorSpecified OutsideDiameterNominal WallThicknessAWeight Plain EndWeight Threadedand 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
27、 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 2.50 700 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 6
28、0.3 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 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 16.0
29、9 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 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
30、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 in sizes larger than NPS 4 DN 100.A 795/A 795M 072NOTE 4Type of groove specified by the purchaser.5.1.9 ASTM designation.6. Materials and Manufacture6.1 The steel for
31、 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 befurnace-welded or electric-resistance welded. Welded pipeover NPS 4 DN 100 shall be electric-resistance-welded.6.3 The wel
32、d 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 processed in such a manner that no untemperedmartensite remains.7. Chemical Composition7.1 The steel shall conform to the requirem
33、ents 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 composition thus determined shall conform to therequirements specified in Table 3.7.3 Methods, practices, and definitions for c
34、hemical analy-sis shall be in accordance with Test Methods, Practices, andTerminology A 751.7.4 If the analysis of either pipe does not conform to therequirements specified in Table 3, analyses shall be made onadditional pipes of double the original number from the samelot, each of which shall confo
35、rm 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 asprescribed in Table 1 and Table 2. This does not prohibit testingat a higher pressure at the manufacturers option. The manu
36、-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 lengths.8.2 The hydrostatic test shall be applied, without leakagethrough the pipe wall, to each length of pipe.NOTE 5The hydr
37、ostatic 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. Nondestructive Electric Test9.1 As an alternative to the hydrostatic test, and whenaccepted by the purchaser, test each pipe wi
38、th a nondestructiveelectric test in accordance with Practice E 213 or PracticeE 309. It is the intent of this test to reject pipe containingdefects.9.2 The following information is for the benefit of the userof this specification:9.2.1 The ultrasonic examination referred to in this specifi-cation is
39、 intended to detect longitudinal discontinuities havinga reflective area similar to or larger than the reference notch.The examination may not detect circumferentially orientedimperfections or short, deep defects.9.2.2 The eddy-current examination referenced in thisspecification has the capability o
40、f detecting significant discon-tinuities, especially of the short, abrupt type.9.2.3 The 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 w
41、all and may be either visuallyseen or detected by a loss of pressure. This test may not detectvery tight, through-the-wall defects or defects that extend anappreciable distance into the wall without complete penetra-tion.9.2.4 Apurchaser interested in ascertaining the nature (type,size, location, an
42、d orientation) of discontinuities that can bedetected in the specific application of these 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 tub
43、e shall contain, at the option of the producer, anyone or more of the following discontinuities 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 diame
44、ter of the hole shall not belarger than 0.031 in. 0.8 mm for pipe under 0.125 in. 3.2mm 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 wallthickness, and not larger than 0.125 in. 3.2 mm for pipe over0.200 in. 5.0 mm in wall thickness.9.
45、3.2 Transverse Tangential NotchUsing a round tool orfile with a14-in. 6-mm diameter, file or mill a notchtangential to the surface and transverse to the longitudinal axisof the pipe. The notch shall have a depth not exceeding 1212 %of the specified wall thickness of the pipe.9.3.3 Longitudinal Notch
46、Machine a notch 0.031 in. 0.8mm or less in width in a radial plane parallel to the pipe axison the outside surface of the pipe, to have a depth notexceeding 1212 % of the specified wall thickness of the pipe.The length of the notch shall be compatible with the testingmethod.9.3.4 CompatibilityThe di
47、scontinuity in the calibrationpipe shall be compatible with the testing equipment andmethod being used.9.4 Reject pipe producing a signal equal to or greater thanthe calibration discontinuity.TABLE 3 Chemical RequirementsComposition, max, %CMnP SType E (electric-resistance-welded pipe) otherwise the
48、 length shall be rejected. For pipe produced inmultiple lengths, retests may 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 times while work is being performed, to allparts of the manufacturers works that concern the manufactureof the material ordered. The manufacturer shall
