1、Designation: F721 81 (Reapproved 2014) An American National StandardStandard Specification forGage Piping Assemblies1This standard is issued under the fixed designation F721; the number immediately following the designation indicates the year of originaladoption or, in the case of revision, the year
2、 of last revision. A number in parentheses indicates the year of last reapproval. A superscriptepsilon () 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. Scope1.1 This specification covers de
3、tails of gage piping assem-blies for pressure gages with optional provisions for additionalgages, pressure switches, transmitters, and so forth, for usewith steam, steam drains, feed water, condensate, fresh water,salt water, compressed air, fuel oil, and lubricating oil systems.1.2 The values state
4、d in inch-pound units are to be regardedas the standard. The values given in parentheses are forinformation only.2. Referenced Documents2.1 ASTM Standards:2A105/A105M Specification for Carbon Steel Forgings forPiping ApplicationsA106/A106M Specification for Seamless Carbon Steel Pipefor High-Tempera
5、ture ServiceA108 Specification for Steel Bar, Carbon and Alloy, Cold-FinishedA182/A182M Specification for Forged or Rolled Alloy andStainless Steel Pipe Flanges, Forged Fittings, and Valvesand Parts for High-Temperature ServiceA276 Specification for Stainless Steel Bars and ShapesA335/A335M Specific
6、ation for Seamless Ferritic Alloy-Steel Pipe for High-Temperature ServiceA576 Specification for Steel Bars, Carbon, Hot-Wrought,Special QualityB16/B16M Specification for Free-Cutting Brass Rod, Barand Shapes for Use in Screw MachinesB61 Specification for Steam or Valve Bronze CastingsB62 Specificati
7、on for Composition Bronze or Ounce MetalCastingsB75 Specification for Seamless Copper TubeB124/B124M Specification for Copper and Copper AlloyForging Rod, Bar, and ShapesB453/B453M Specification for Copper-Zinc-Lead Alloy(Leaded-Brass) Rod, Bar, and ShapesB466/B466M Specification for Seamless Copper
8、-NickelPipe and Tube2.2 ANSI Standards:3B16.11 Forged Steel Fittings, Socket Weld, and ThreadedB16.15 Cast Bronze Threaded Fittings2.3 Federal Specifications:4QQ-S-637 Steel Bar, Carbon, Cold Finished (StandardQuality, Free Machining)QQ-S-763 Steel Bars, Wire, Shapes, and Forgings,Corrosion-Resistin
9、g3. List of Assemblies3.1 This specification incorporates 13 gage piping assem-blies as described in Table 1.4. General Requirements and Guidelines4.1 Fig. 1 shows a typical piping assembly for bottom-connected gages and Fig. 2 a typical piping assembly forback-connected gages.4.2 A siphon shall be
10、used as shown in all gage applicationsfor steam systems to maintain a protective water seal betweenthe gage and the steam supply.4.3 Each assembly includes a test connection beyond thegage valve which consists of a tee with a14-in. NPT threadedplug in the branch. The plug is removable for the purpos
11、e ofinstalling a test gage for calibration. As an alternative, a gagevalve that incorporates a built-in test connection integral withthe valve may be substituted for the gage valve and test tee.4.4 Root connections should be kept to a minimum byconnecting other instruments at the tee between the roo
12、t andgage valves. There is no limit to the number of dead-end-typeinstruments that can be served from a single root connection.1This specification is under the jurisdiction of ASTM Committee F25 on Shipsand Marine Technology and is the direct responsibility of Subcommittee F25.11 onMachinery and Pip
13、ing Systems.Current edition approved Aug. 1, 2014. Published September 2014. Originallyapproved in 1981. Last previous edition approved in 2008 as F721 81 (2008).DOI: 10.1520/F0721-81R14.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at servicea
14、stm.org. For Annual Book of ASTMStandards volume information, refer 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 10036.4Available from Standardization Documents Order Desk, Bldg. 4 Secti
15、on D, 700Robbins Ave., Philadelphia, PA 19111-5094, Attn: NPODS.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1However, each instrument should have its own shutoff valveand, if desired, a test tee may be fitted at each instrument.4.5
16、 Two shutoff valves are generally used in each assembly,a root valve and a gage cutout valve. The gage valve may beeliminated and a single shutoff valve may serve as both a rootand gage valve provided the gage is within 6 ft (1.8 m) of theroot connection and readily accessible and the single shutoff
17、valve is fitted within 12 in. (300 mm) of the root connection.4.6 Pulsation dampeners are shown for certain assembliesbetween the test tee and gage and should be used in otherassemblies in which the gage may be subjected to pulsatingpressures, as from a reciprocating pump, air compressor,quick-actin
18、g solenoid valves, and high-frequency vibrations ofhigh-pressure feed pumps.4.7 Isolation devices (diaphragm seals) should be installedwhere system fluid viscosity and fuel isolation is a consider-ation.TABLE 1 Gage Piping AssembliesA,BAssemblyNo.ServiceMaximum Pressure,psi (kPa)Maximum Temperature,
19、F (C)1 Superheated steam 1125 (7757) 960 (516)2 High-pressure desuperheated steam and high-pressure extractions 1100 (7584) 580 (304)3 Low-pressure extractions, gland seal, auxiliary exhaust, and 150-psig (1034-MPa)steam900 (6205) 563 (295)4 Low-pressure steam 125 (861) 353 (178)5 Boiler feed discha
20、rge 1500 (10 342) 450 (232)6 Feed suction and condensate 165 (1138) 300 (149)7 Compressed air above 165 psi (1.14 MPa) 900 (6205) 563 (295)8 Compressed air 165 (1138) 300 (149)9 Fresh and potable water 200 (1379) 150 (66)10 Main and auxiliary salt water circulating, salt water service, and wet firem
21、ain 200 (1379) 150 (66)11 Dry firemain and deck washdown 200 (1379) 150 (66)12 Fuel oil and lube oil 900 (6205) 250 (121)13 Diesel oil 900 (6205) 563 (295)AFor typical piping assemblies see Fig. 1 and Fig. 2.BFor materials required see Table 2 and Table 3.NOTE 1For material identification see Table
22、3.NOTE 2Use siphon for Assemblies 1 through 4.NOTE 3For pulsation dampener requirements see 4.6 and Table 3.NOTE 4Piping through the root valve is normally detailed on thepiping arrangement drawings but is shown here as an aid in establishingmaterial requirements.FIG. 1 Typical Piping Assembly for B
23、ottom-Connected GagesNOTE 1For material identification see Table 3.NOTE 2Use siphon for Assemblies 1 through 4.NOTE 3For pulsation dampener requirements see 4.6 and Table 3.NOTE 4Piping through the root valve is normally detailed on thepiping arrangement drawings but is shown here as an aid in estab
24、lishingmaterial requirements.FIG. 2 Typical Piping Assembly for Back-Connected GagesF721 81 (2014)25. Services, Pressure/Temperature Limitations, andMaterial5.1 Service and pressure/temperature limitations for eachassembly are listed in Table 1 and materials are listed in Table2 and Table 3. Other s
25、ervices, pressure/temperatures, andmaterials may be used provided the materials selected arecompatible with the intended system media, and the pressure/temperature limitations do not exceed the limitations of thematerial chosen.TABLE 2 Material ListPart No. Nominal Size, in. Description Material Spe
26、cification112 NPS by12 FPT Globe valve, thread by socket weld alloy steel (Cr-Mo) ASTM A182/A182M,F11214 FPT Globe needle valve, thread, bar stock type carbon steel QQ-S-637, Grades 1213 and 1215314 NPS by14 FPT Globe needle valve, thread by socket weld, barstock typecarbon steel QQ-S-637, 1213 and
27、1215412 NPS by12 FPT Globe needle valve, thread by socket weld, barstock typecarbon steel QQ-S-637, 1213 and 1215514 NPS Globe needle valve, socket weld, bar stock type carbon steel QQ-S-637, 1213 and 1215614 NPS by14 FPT Globe needle valve, thread by socket weld, barstock type316 stainless steel QQ
28、-S-763714 FPT Globe needle valve, thread, bar stock type 316 stainless steel QQ-S-763814 NPS by14 FPT Globe needle valve, thread by silbraze bronze ASTM B61914 FPT Globe needle valve, thread bronze ASTM B611012 NPS Pipe, Schedule 80 alloy steel (Cr-Mo) ASTM A335/A335M,P111114 NPS Pipe, Schedule 80 c
29、arbon steel ASTM A106/A106M, Grade B1212 NPS Pipe, Schedule 80 carbon steel ASTM A106/A106M, Grade B1314 NPS Pipe, Schedule 80 copper-nickel 90-10 ASTM B466/B466M, Alloy 7061414 OD Tubing, 0.065-in. (1.65-mm) wall carbon steel ASTM A106/A106M, Grade B1514 OD Tubing, 0.035-in. (0.89-mm) wall copper A
30、STM B751614 OD by12 MPT Connector, tube by thread, compression type carbon steel ASTM A108, Grade 12L141712 by14 NPS Reducing insert, socket weld carbon steel ASTM A105/A105M, ANSI B16.111814 FPT Tee, thread carbon steel ASTM A105/A105M, ANSI B16.111914 MPT Plug, thread carbon steel ASTM A105/A105M,
31、 ANSI B16.112014 NPS Tee, socket weld carbon steel ASTM A105/A105M, ANSI B16.112114 NPS Union, socket weld carbon steel ASTM A105/A105M, ANSI B16.112214 NPS Coupling carbon steel ASTM A105/A105M, ANSI B16.112314 OD by14 MPT Connector, tube by thread, compression type carbon steel ASTM A108, Grade 12
32、L142414 OD Tee, tube, compression type carbon steel ASTM A576, Grade 12L142514 OD Union, tube, compression type carbon steel ASTM A108, Grade 12L142614 FPT Tee thread bronze ASTM B62, ANSI B16.152714 MPT Plug, thread bronze ASTM B62, ANSI B16.152814 OD Union, tube, compression type brass ASTM B453/B
33、453M, Alloy 345;ASTMB16/B16M, Alloy 3602914 OD by14 MPT Connector, tube by thread, compression type brass ASTM B453/B453M, Alloy 345;ASTMB16/B16M, Alloy 3603014 OD Tee, tube, compression type brass ASTM B124/B124M, Alloy 3773114 OD by14 MPT Connector, tube by thread, compression type 316 stainless s
34、teel ASTM A2763214 OD Tee, tube, compression type 316 stainless steel ASTM A2763314 MPT by14 FPT Pulsation dampener, thread 316 stainless steel commercial3414 FPT 90 elbow, thread carbon steel ASTM A105/A105M, ANSI B16.113514 FPT 90 elbow, thread bronze ASTM B62, ANSI B16.153614 OD Union, tube, comp
35、ression type 316 stainless steel ASTM A276F721 81 (2014)3ASTM 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 paten
36、t rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited eithe
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38、aring you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standar
39、d may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the Copyright Clearance Center, 222Rosewood Drive, Dan
40、vers, MA 01923, Tel: (978) 646-2600; http:/ 3 Material Part Numbers Used in Gage Piping AssembliesAAssemblyBNo.Component Identification Letter (See Fig. 1 for Bottom-Connected Gages or Fig. 2 for Back-Connected Gages)ABCDEFGHJKL MNCPC1 . 10 1 16 14 24 25 2 18 19 . . 34 112 . 12 4 16 14 24 25 2 18 19
41、 . . 34 113 . 11 3 23 14 24 25 2 18 19 . . 34 114 . 11 3 23 15 24 25 2 26 27 . . 34 115 17 11 3 23 14 24 25 2 18 19 33 . 34 116 . 11 3 23 15 24 25 2 26 27 . . 34 117 . 11 3 23 14 24 25 2 18 19 33 . 34 118 . 13 3 23 15 24 25 2 26 27 33 . 34 139 . 13 8 29 15 30 28 9 26 27 . . 35 1310 . 13 6 31 15 32 3
42、6 7 26 27 . . 35 1311 . 11 8 31 15 32 36 9 26 27 . . 35 1312 . 11 5 . 11 20 22 5 18 19 . 21 34 1113 . 11 3 23 14 24 25 2 18 19 . . 34 11AFor description of material part numbers see Table 2.BFor service and pressure/temperature limitations of each assembly see Table 1.C“N and “P are for use with back-connected gages only.F721 81 (2014)4
