1、Designation: A 795/A 795M 08Standard 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 () indicates an editorial change since the last revision or reapproval.1. Scope*1.1 This specification covers black and hot-dipped galva-nized welded and
3、 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 as
4、 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 (Note
5、 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 propert
6、ies.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 pip
7、e. 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 pertain
8、s 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 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, each systemshall
10、 be used independently of the other. Combining valuesfrom the two systems may result in non-conformance with thestandard.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 Packagin
11、g, 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 for Z
12、incE 213 Practice for Ultrasonic Examination of Metal Pipeand TubingE 309 Practice for Eddy-Current Examination of Steel Tu-bular Products Using Magnetic SaturationE 570 Practice for Flux Leakage Examination of Ferromag-netic Steel Tubular Products2.2 ASME Standards:B1.20.1 Pipe Threads, General Pur
13、pose, Inch3B36.10 Welded and Seamless Wrought Steel Pipe3B36.19 Stainless Steel Pipe32.3 Federal Standard:Fed. Std. No. 123 Marking for Shipments (Civil Agencies)42.4 Military Standards:MIL-STD-129 Marking for Shipment and Storage41This specification is under the jurisdiction of ASTM Committee A01 o
14、n Steel,Stainless Steel and Related Alloys and is the direct responsibility of SubcommitteeA01.09 on Carbon Steel Tubular Products.Current edition approved May 15, 2008. Published June 2008. Originallyapproved in 1982. Last previous edition approved in 2007 as A 795/A 795M07.2For referenced ASTM sta
15、ndards, 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 He
16、adquarters, 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,
17、 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.MIL-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 sufficient size or magni-tude to be cause for re
18、jection.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 SSeamless.NOTE 3See Annex A1 for definitions
19、 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 (steel pipe),5.1.3 Type (seamless, electric-re
20、sistance-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, galvanized, or other type of coating as
21、specified by the purchaser),5.1.7 Length (specific or random),5.1.7.1 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 Couplin
22、gs power tight.TABLE 1 Dimensions, Weights, and Test Pressure For Light-Weight 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
23、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 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
24、.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 5.563 141.3 0.134 3.40 7.78 11.58BB1200 83006 150 6.625 168.3 0.134 3.40 9.30 13.85 1000 690
25、08 200 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.BFurnace-welded pipe is not made in sizes larger than NPS 4 DN 100.CNot Schedule 10.TABLE
26、 2 Dimensions, Weights, Test Pressures For Standard-Weight Fire Protection PipeSchedule 30 and Schedule 40NPSDesignatorDNDesignatorSpecified OutsideDiameterNominal WallThicknessAWeight Plain EndWeight Threadedand CoupledBTest PressureFurnace-WeldedSeamless andElectric-Resistance-Weldedin. mm in. mm
27、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 2.50 700 4800 700 4800114 32 1.660 42.2 0.140 3.56 2.27 3.39 2.28 3.40 1000 6900 1000 69001
28、12 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 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
29、.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 19.20 28.60 1200 83008 200 8.625 219.1 0.277A7.04 24.72 36.82 25.57 38.09CC1200 8300
30、10 250 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 in sizes larger than NPS 4 DN 100.A 795/A 795M 082NOTE 4Type of groove specified by the
31、 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 befurnace-welded or electric-resistance welde
32、d. 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 processed in such a manner that no untemperedmarten
33、site 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 composition thus determined shall conform to the
34、requirements specified in Table 3.7.3 Methods, practices, and definitions for chemical 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
35、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 asprescribed in Table 1 and Table 2. This does
36、 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 lengths.8.2 The hydrostatic test shall be appli
37、ed, 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. Nondestructive Electric Test9.1 As an alternativ
38、e to the hydrostatic test, and whenaccepted by the purchaser, test each pipe with a nondestructiveelectric test in accordance with Practice E 213, Practice E 309,or Practice E 570. It is the intent of this test to reject pipecontaining defects.9.2 The following information is for the benefit of the
39、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 circumferentially orientedimperfections or short, deep
40、 defects.9.2.2 The eddy-current examination referenced in thisspecification has the capability of detecting significant discon-tinuities, especially of the short, abrupt type.9.2.3 The flux leakage examination referred to in thisspecification is capable of detecting the presence and locationof signi
41、ficant 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 The hydrostatic test referred to in Sectio
42、n 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 detectvery tight, through-the-wall defe
43、cts 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 these examinationsshould discuss this with
44、 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 discontinuities to establish aminimum sensitivi
45、ty 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 in wall thickness, not larger than 0.06
46、25 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.9.3.2 Transverse Tangential NotchUsing a round tool orfile with a14-in. 6-mm diameter, file or mill a notchtangential to the surf
47、ace 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 NotchMachine 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,
48、 to have a depth notTABLE 3 Chemical RequirementsComposition, max, %CMnP SType E (electric-resistance-welded pipe) otherwise the 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
