1、Designation: F1508 96 (Reapproved 2010)An American National StandardStandard Specification forAngle Style, Pressure Relief Valves for Steam, Gas, andLiquid Services1This standard is issued under the fixed designation F1508; the number immediately following the designation indicates the year oforigin
2、al adoption or, in the case of revision, the 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.1. Scope1.1 This specification covers spring-loaded, angle style,pressure rel
3、ief valves for steam, gas, and liquid systemapplications (excluding boiler safety and hydraulic systemrelief valves).1.2 The values stated in inch-pound units are to be regardedas standard. No other units of measurement are included in thisstandard.2. Referenced Documents2.1 ASTM Standards:2A105/A10
4、5M Specification for Carbon Steel Forgings forPiping ApplicationsA125 Specification for Steel Springs, Helical, Heat-TreatedA182/A182M Specification for Forged or Rolled Alloy andStainless Steel Pipe Flanges, Forged Fittings, and Valvesand Parts for High-Temperature ServiceA193/A193M Specification f
5、or Alloy-Steel and StainlessSteel Bolting Materials for High Temperature or HighPressure Service and Other Special Purpose ApplicationsA194/A194M Specification for Carbon and Alloy SteelNuts for Bolts for High Pressure or High TemperatureService, or BothA216/A216M Specification for Steel Castings, C
6、arbon,Suitable for Fusion Welding, for High-Temperature Ser-viceA217/A217M Specification for Steel Castings, MartensiticStainless and Alloy, for Pressure-Containing Parts, Suit-able for High-Temperature ServiceA227/A227M Specification for Steel Wire, Cold-Drawn forMechanical SpringsA229/A229M Specif
7、ication for Steel Wire, Oil-Temperedfor Mechanical SpringsA231/A231M Specification for Chromium-Vanadium AlloySteel Spring WireA276 Specification for Stainless Steel Bars and ShapesA313/A313M Specification for Stainless Steel Spring WireA351/A351M Specification for Castings, Austenitic, forPressure-
8、Containing PartsA479/A479M Specification for Stainless Steel Bars andShapes for Use in Boilers and Other Pressure VesselsA494/A494M Specification for Castings, Nickel and NickelAlloyA689 Specification for Carbon and Alloy Steel Bars forSpringsB21/B21M Specification for Naval Brass Rod, Bar, andShape
9、sB61 Specification for Steam or Valve Bronze CastingsB62 Specification for Composition Bronze or Ounce MetalCastingsB148 Specification for Aluminum-Bronze Sand CastingsB164 Specification for Nickel-Copper Alloy Rod, Bar, andWireB637 Specification for Precipitation-Hardening Nickel Al-loy Bars, Forgi
10、ngs, and Forging Stock for High-Temperature ServiceD5204 Classification System for Polyamide-Imide (PAI)Molding and Extrusion MaterialsF467 Specification for Nonferrous Nuts for General UseF468 Specification for Nonferrous Bolts, Hex Cap Screws,and Studs for General Use2.2 ANSI Standards:3ANSI B1.1
11、Unified Screw ThreadsANSI B16.5 Pipe Flanges and Flanged FittingsANSI B16.34 ValvesFlanged, Threaded, and WeldingEnd2.3 ASME Standard:4ASME Boiler and Pressure Vessel Code2.4 API Standards:51This specification is under the jurisdiction of ASTM Committee F25 on Shipsand Marine Technology and is the d
12、irect responsibility of Subcommittee F25.11 onMachinery and Piping Systems.Current edition approved May 1, 2010. Published June 2010. Originallyapproved in 1996. Last previous edition approved in 2004 as F1508 96 (2004).DOI: 10.1520/F1508-96R10.2For referenced ASTM standards, visit the ASTM website,
13、 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 National Standards Institute (ANSI), 25 W. 43rd St.,4th Floor, New York, NY 10036, http:/ww
14、w.ansi.org.4Available from American Society of Mechanical Engineers (ASME), ASMEInternational Headquarters, Three Park Ave., New York, NY 10016-5990, http:/www.asme.org.5Available from American Petroleum Institute (API), 1220 L. St., NW, Wash-ington, DC 20005-4070, http:/www.api.org.1Copyright ASTM
15、International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.API 526 Flanged Steel Safety-Relief ValvesAPI RP 520, Part 1 Recommended Practice for the Designand Installation of Pressure-Relieving Systems in Refin-eries2.5 Federal Specifications:6QQ-N-281 Nickel-
16、Copper Alloy Bar, Rod, Plate, Sheet,Strip, Wire, Forgings, and Structural and Special ShapedSectionsQQ-N-286 Nickel-Copper-Aluminum Alloy, Wrought(UNS N05500)2.6 Military Standards and Specifications:6MIL-STD-167-1 Mechanical Vibrations of ShipboardEquipment (Type IEnvironmental and Type IIInternall
17、y Excited)MIL-STD-1330 Cleaning and Testing of Shipboard Oxy-gen, Nitrogen and Hydrogen Gas Piping SystemsMIL-F-1183 Fittings, Pipe, Cast Bronze, Silver Brazing,General Specification forMIL-F-20042 Flanges, Pipe and Bulkhead, Bronze (SilverBrazing)MIL-P-46122 Plastic Molding Material and Plastic Ext
18、ru-sion Material, Polyvinylidene Fluoride Polymer and Co-polymerMIL-R-17131 Rods, Welding, SurfacingMIL-S-901 Shock Tests, H.I. (High-Impact); ShipboardMachinery, Equipment and Systems, Requirements forMS 16142 Boss, Gasket-Seal Straight Thread Tube Fitting,Standard Dimensions forMS 51840 Plug, Mach
19、ine Thread, O-ring2.7 Naval Sea Systems Command (NAVSEA):6Drawings:803-1385884 Unions, Fittings and Adapters, Butt andSocket Welding, 6000 PSI, WOG IPS803-1385943 Unions, Silver Brazing, 3000 PSI, WOG IPS,for UT Inspection803-1385946 Unions, Bronze Silver Brazing, WOG, for UTInspection3. Terminology
20、3.1 Definitions:3.1.1 accumulationthe increase in static pressure abovethe set pressure during discharge through the valve, when thevalve passes the rated flow. Accumulation is expressed inpound-force per square inch or as a percent of the set pressure.3.1.2 accumulation pressurethe set pressure plu
21、s the ac-cumulation. Accumulation pressure is expressed in pound-force per square inch gage.3.1.3 blowdownthe difference between the set pressureand the reseating pressure. Blowdown is expressed in pound-force per square inch or a percent of the set pressure. Theaccumulation and blowdown establish t
22、he operating band ofthe pressure relief valve at a particular set pressure.3.1.4 blowdown pressurethe set pressure minus the blow-down. Blowdown pressure is expressed in pound-force persquare inch gage.3.1.5 built-up backpressurethe static discharge pressure atthe outlet of a pressure relief valve c
23、aused by the pressure dropin the discharge piping while the valve is discharging.3.1.6 gagging devicea device, normally a screw (alsocalled test gag), used to prevent the pressure relief valve fromopening during a hydrostatic pressure test of the equipment onwhich it is installed.3.1.7 inlet pipingw
24、hen used in this specification, refers toall piping and fittings between the source and the inletconnection to the pressure relief valve.3.1.8 instability (chatter, flutter)an unstable operation ofthe pressure relief valve characterized by rapid seating andunseating of the disk during discharge. Thi
25、s hammering of thedisk on the seat can cause high loading forces, which can leadto damage and rapid failure of the seating and sliding surfaces.3.1.9 maximum system operating pressurethe highestpressure that can exist in a system, vessel, or component undernormal (noncasualty) operating conditions.
26、This is a normal(noncasualty) pressure that the pressure relief valve is notintended to protect against. This pressure can be the result ofinfluences such as pump or compressor shutoff pressure,pressure regulating valve lockup (no flow) pressure, and soforth.3.1.10 opening pressurethe value of incre
27、asing inletstatic pressure of a pressure relief valve at which there is ameasurable lift, or at which the discharge becomes continuousby seeing, feeling, or hearing.3.1.11 outlet piping (or discharge piping)when used inthis specification, refers to all piping and fittings between thepressure relief
28、valve outlet connection and the main, tank, oratmosphere to which the pressure relief valve relieves.3.1.12 popping pressurethe value of increasing inlet staticpressure at which the disk moves in the opening direction at afaster rate as compared with the corresponding movement athigher or lower pres
29、sures. It generally applies to valves withcompressible fluid service such as steam, gas, and so forth.3.1.13 pressure relief valvean automatic pressure reliev-ing device actuated by the static pressure upstream of the valveand characterized by either rapid opening (pop action for gas,vapor, or steam
30、) or gradual opening (for liquids).3.1.14 primary and secondary pressure zones of pressurerelief valveprimary pressure zone refers to all portions of thepressure-containing envelope subject to inlet pressure; second-ary pressure zone refers to all portions of the pressure-containing envelope subject
31、 to outlet or discharge pressure(includes spring housing of nonvented valves).3.1.15 relieving capacity (also called flow capacity)thepressure relief valve is defined as the quantity of pressuremedium relieving through the pressure relief valve at theaccumulation pressure, such as pound per hour of
32、steam, gallonper minute of water at 70F, or SCFM (standard cubic feet perminute at 60F and 14.7 psia) of air, as applicable.3.1.16 set pressurethe value of increasing inlet staticpressure at which a pressure relief valve displays one of theoperational characteristics as defined under opening pressur
33、e,or start-to-leak pressure. Set pressure is expressed in pound-force per square inch gage.6Available from Standardization Documents Order Desk, Bldg. 4 Section D, 700Robbins Ave., Philadelphia, PA 19111-5094, Attn: NPODS.F1508 96 (2010)23.1.17 set pressure rangethe range over which the setpressure
34、can be adjusted with the installed spring.3.1.18 set pressure tolerancethe permissible plus or mi-nus deviation from the specified set pressure. Set pressuretolerance is expressed in pound-force per square inch or as apercent of the set pressure.3.1.19 sourcewhen used in this specification, refers t
35、o thepressure container being protected from overpressure by thepressure relief valve, for example, piping main, pressure vesselor tank, casing, and so forth.3.1.20 start-to-leak pressurethe value of increasing inletstatic pressure at which the first bubble occurs when a pressurerelief valve for com
36、pressible fluid service of the resilient diskdesign is tested by means of air under a specified water seal onthe outlet.3.1.21 superimposed backpressurethe static pressure onthe discharge side of a pressure relief valve prior to the openingof the pressure relief valve. This pressure exists where the
37、pressure relief valve discharges into a common pipeline sharedwith other pressure sources such as pressure relief valves, orinto a pressurized or closed system. This pressure may have theeffect of changing the set pressure of the pressure relief valve.3.1.22 top-guided valvethis type of valve has al
38、l theguiding, rubbing, or contacting surfaces on the discharge sideof the seat.4. Classification4.1 Pressure relief valves shall be of the following types andmaterial grades:4.1.1 Type IFor Steam Service:4.1.1.1 Grade AAlloy steel construction (for steam ser-vice temperatures up to 1000F) (see Table
39、 8).4.1.1.2 Grade BCarbon steel construction (for steamservice temperatures up to 775F) (see Table 8).4.1.2 Type IIFor Air, Gas Service:4.1.2.1 Grade CBronze or stainless steel construction (forair, gas service excluding oxygen) (see Table 9).4.1.2.2 Grade DNi-Cu alloy construction (for oxygen)(see
40、Table 9).4.1.3 Type IIIFor Liquid Service (except hydraulic oil):4.1.3.1 Grade EFerrous construction (for noncorrosiveliquids, such as fuel oil, water, steam condensate, and so forth)(see Table 9).4.1.3.2 Grade FNonferrous construction (for corrosiveliquids, such as seawater, and so forth) (see Tabl
41、e 9).5. Ordering Information5.1 Ordering documentation for valves under this specifica-tion shall include the following information, as required, todescribe the equipment adequately.5.1.1 ASTM designation and year of issue.5.1.2 Valve specification code (see 6.2).5.1.3 Quantity of valves.5.1.4 Maxim
42、um inlet temperature.5.1.5 Set pressure.5.1.6 Required relieving capacity (flow) at the accumulationpressure.5.1.7 Installation limitations data, if different than specifiedin 7.9.5.1.8 Blowdown limits, if different than specified in 7.7.5.1.9 Envelope dimensions, if not covered in Table 13 andTable
43、 14.5.1.10 Supplementary requirements, if any (see S1 throughS5).6. Valve Coding and Construction6.1 Valves shall incorporate the design features specified in6.2 and 6.3.6.2 Valve Specification CodingBasic valve design fea-tures shall be specified and recorded using the following valvecoding system.
44、 The valve specification code contains ninefields of information, which describe the construction featuresof the valve. Each of these nine fields are further assigned theirrespective codes in accordance with Tables 1-7.6.3 ConstructionValve construction shall be in accor-dance with the requirements
45、specified in 6.3.1-6.3.19.6.3.1 The materials of construction for various valve com-ponents are detailed in Table 8 for Type I valves and Table 9 forTypes II and III valves.6.3.2 General RequirementsThe valve shall be self-contained, single-seated, and spring-loaded where the inletpressure is direct
46、ly sensed under the spring-loaded disk. Thevalve shall incorporate only a single inlet and a single outletconnection.6.3.3 Pressure-Temperature RatingsThe pressure-temperature ratings of a pressure relief valve consist of ratingsfor the primary and secondary pressure zones.6.3.3.1 Pressure-Temperatu
47、re Rating of the Primary Pres-sure ZoneThis shall correspond to the rating of the inlet endconnection, and is given in Table 10.6.3.3.2 Pressure-Temperature Rating of the Secondary Pres-sure ZoneThe secondary pressure zone shall withstand thehigher of the following:(1) 150 % of maximum backpressure
48、buildup specified in7.9.(2) 600 psig (for Type II, Grade C and Type III, Grade Fvalves only).TABLE 1 Valve Type and Material CodeValve ClassificationValve Type and MaterialCodeValve Type Material GradeIA1IB2II C 3II D 4III E 5III F 6As specified as specified 9F1508 96 (2010)3(3) ANSI B16.34, Class 1
49、50 pressure rating (for Type I,Grades A and B and Type III, Grade E valves only).6.3.4 Body ConstructionThe valve shall be of the angle-body design. It shall be constructed so that the seat will notbecome distorted relative to the disk, and valve operation is notadversely affected by internal pressure and temperature.6.3.5 Bonnet Construction (Spring Housing):6.3.5.1 For Type I valves, the bonnet shall be attached to thebody with bolted flanges. Type I, Grade A valves must haveexposed spring bonnetsthe discharge flow released throug
