ASTM F1508-96(2021)
(Specification)Standard Specification for Angle Style, Pressure Relief Valves for Steam, Gas, and Liquid Services
Standard Specification for Angle Style, Pressure Relief Valves for Steam, Gas, and Liquid Services
ABSTRACT
This specification covers spring-loaded, angle style, pressure relief valves for steam, gas, and liquid system applications. Pressure relief valves shall be of the following types and material grades: Type I, Grades A and B; Type II, Grades C and D; and Type III, Grades E and F. Hydrostatic shell test and set pressure, blowdown, and seat tightness test shall be performed to meet the specified requirements.
SCOPE
1.1 This specification covers spring-loaded, angle style, pressure relief valves for steam, gas, and liquid system applications (excluding boiler safety and hydraulic system relief valves).
1.2 The values stated in inch-pound units are to be regarded as standard. No other units of measurement are included in this standard.
1.3 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
General Information
Relations
Standards Content (Sample)
This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation:F1508 −96 (Reapproved 2021) An American National Standard
Standard Specification for
Angle Style, Pressure Relief Valves for Steam, Gas, and
Liquid Services
This standard is issued under the fixed designation F1508; the number immediately following the designation indicates the year of
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 Stainless and Alloy, for Pressure-Containing Parts, Suit-
able for High-Temperature Service
1.1 This specification covers spring-loaded, angle style,
A227/A227M Specification for Steel Wire, Cold-Drawn for
pressure relief valves for steam, gas, and liquid system
Mechanical Springs
applications (excluding boiler safety and hydraulic system
A229/A229M Specification for Steel Wire, Quenched and
relief valves).
Tempered for Mechanical Springs
1.2 The values stated in inch-pound units are to be regarded
A231/A231M Specification for Chromium-Vanadium Alloy
as standard. No other units of measurement are included in this
Steel Spring Wire
standard.
A276 Specification for Stainless Steel Bars and Shapes
1.3 This international standard was developed in accor- A313/A313M Specification for Stainless Steel Spring Wire
dance with internationally recognized principles on standard-
A351/A351M Specification for Castings, Austenitic, for
ization established in the Decision on Principles for the Pressure-Containing Parts
Development of International Standards, Guides and Recom-
A479/A479M Specification for Stainless Steel Bars and
mendations issued by the World Trade Organization Technical Shapes for Use in Boilers and Other Pressure Vessels
Barriers to Trade (TBT) Committee.
A494/A494M Specification for Castings, Nickel and Nickel
Alloy
2. Referenced Documents
A689 Specification for Carbon and Alloy Steel Bars for
Springs
2.1 ASTM Standards:
B21/B21M Specification for Naval Brass Rod, Bar, and
A105/A105M Specification for Carbon Steel Forgings for
Shapes
Piping Applications
B61 Specification for Steam or Valve Bronze Castings
A125 Specification for Steel Springs, Helical, Heat-Treated
B62 Specification for Composition Bronze or Ounce Metal
A182/A182M Specification for Forged or Rolled Alloy and
Castings
Stainless Steel Pipe Flanges, Forged Fittings, and Valves
B148 Specification for Aluminum-Bronze Sand Castings
and Parts for High-Temperature Service
B164 Specification for Nickel-Copper Alloy Rod, Bar, and
A193/A193M Specification for Alloy-Steel and Stainless
Wire
Steel Bolting for High Temperature or High Pressure
B637 Specification for Precipitation-Hardening and Cold
Service and Other Special Purpose Applications
Worked Nickel Alloy Bars, Forgings, and Forging Stock
A194/A194M Specification for Carbon Steel, Alloy Steel,
for Moderate or High Temperature Service
and Stainless Steel Nuts for Bolts for High Pressure or
D5204 Classification System and Basis for Specification for
High Temperature Service, or Both
Polyamide-Imide (PAI) Molding and Extrusion Materials
A216/A216M SpecificationforSteelCastings,Carbon,Suit-
F467 Specification for Nonferrous Nuts for General Use
able for Fusion Welding, for High-Temperature Service
F468 Specification for Nonferrous Bolts, Hex Cap Screws,
A217/A217M Specification for Steel Castings, Martensitic
Socket Head Cap Screws, and Studs for General Use
2.2 API Standards:
This specification is under the jurisdiction of ASTM Committee F25 on Ships
API 526 Flanged Steel Safety-Relief Valves
and Marine Technology and is the direct responsibility of Subcommittee F25.11 on
API RP 520, Part 1 Recommended Practice for the Design
Machinery and Piping Systems.
and Installation of Pressure-Relieving Systems in Refin-
Current edition approved Jan. 1, 2021. Published January 2021. Originally
ɛ1
approved in 1996. Last previous edition approved in 2016 as F1508 – 96 (2016) .
eries
DOI: 10.1520/F1508-96R21.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on Available from American Petroleum Institute (API), 200 Massachusetts
the ASTM website. Avenue, NW Suite 1100 Washington, DC 20001-5571, http://www.api.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
F1508−96 (2021)
2.3 ASME Standard: force per square inch or a percent of the set pressure. The
ASME Boiler and Pressure Vessel Code, Section VIII accumulation and blowdown establish the operating band of
ASME B1.1 Unified Inch Screw Threads (UN, UNR, and the pressure relief valve at a particular set pressure.
UNJ Thread Forms)
3.1.4 blowdown pressure, n—the set pressure minus the
ASME B16.5 Pipe Flanges and Flanged Fittings: NPS 1/2
blowdown. Blowdown pressure is expressed in pound-force
through NPS 24 Metric/Inch Standard
per square inch gauge.
ASME B16.34 Valves — Flanged, Threaded, and Welding
3.1.5 built-up backpressure, n—thestaticdischargepressure
End
at the outlet of a pressure relief valve caused by the pressure
2.4 Federal Specifications:
drop in the discharge piping while the valve is discharging.
QQ-N-281 Nickel-Copper Alloy Bar, Rod, Plate, Sheet,
3.1.6 gagging device, n—a device, normally a screw (also
Strip, Wire, Forgings, and Structural and Special Shaped
called test gag), used to prevent the pressure relief valve from
Sections
opening during a hydrostatic pressure test of the equipment on
QQ-N-286 Nickel-Copper-AluminumAlloy, Wrought (UNS
which it is installed.
N05500)
2.5 Military Standards and Specifications: 3.1.7 inlet piping, n—when used in this specification, refers
MIL-STD-167-1 Mechanical Vibrations of Shipboard
to all piping and fittings between the source and the inlet
Equipment (Type I—Environmental and Type II— connection to the pressure relief valve.
Internally Excited)
3.1.8 instability (chatter, flutter), n—an unstable operation
MIL-STD-1330 Cleaning andTesting of Shipboard Oxygen,
of the pressure relief valve characterized by rapid seating and
Nitrogen and Hydrogen Gas Piping Systems
unseating of the disk during discharge. This hammering of the
MIL-F-1183 Fittings, Pipe, Cast Bronze, Silver Brazing,
disk on the seat can cause high loading forces, which can lead
General Specification for
to damage and rapid failure of the seating and sliding surfaces.
MIL-F-20042 Flanges, Pipe and Bulkhead, Bronze (Silver
3.1.9 maximum system operating pressure, n—the highest
Brazing)
pressure that can exist in a system, vessel, or component under
MIL-P-46122 Plastic Molding Material and Plastic Extru-
normal (noncasualty) operating conditions. This is a normal
sion Material, Polyvinylidene Fluoride Polymer and Co-
(noncasualty) pressure that the pressure relief valve is not
polymer
intended to protect against. This pressure can be the result of
MIL-R-17131 Rods, Welding, Surfacing
influences such as pump or compressor shutoff pressure,
MIL-S-901 Shock Tests, H.I. (High-Impact); Shipboard
pressure regulating valve lockup (no flow) pressure, and so
Machinery, Equipment and Systems, Requirements for
forth.
MS 16142 Boss, Gasket-Seal Straight Thread Tube Fitting,
Standard Dimensions for 3.1.10 opening pressure, n—the value of increasing inlet
MS 51840 Plug, Machine Thread, O-ring static pressure of a pressure relief valve at which there is a
measurable lift, or at which the discharge becomes continuous
2.6 Naval Sea Systems Command (NAVSEA) Drawings:
by seeing, feeling, or hearing.
803-1385884 Unions,FittingsandAdapters,ButtandSocket
Welding, 6000 PSI, WOG IPS
3.1.11 outlet piping (or discharge piping), n—when used in
803-1385943 Unions, Silver Brazing, 3000 PSI, WOG IPS,
this specification, refers to all piping and fittings between the
for UT Inspection
pressure relief valve outlet connection and the main, tank, or
803-1385946 Unions, Bronze Silver Brazing, WOG, for UT
atmosphere to which the pressure relief valve relieves.
Inspection
3.1.12 popping pressure, n—the value of increasing inlet
staticpressureatwhichthediskmovesintheopeningdirection
3. Terminology
at a faster rate as compared with the corresponding movement
3.1 Definitions:
at higher or lower pressures. It generally applies to valves with
3.1.1 accumulation, n—the increase in static pressure above
compressible fluid service such as steam, gas, and so forth.
the set pressure during discharge through the valve, when the
3.1.13 pressure relief valve, n—an automatic pressure
valve passes the rated flow. Accumulation is expressed in
relieving device actuated by the static pressure upstream of the
pound-force per square inch or as a percent of the set pressure.
valve and characterized by either rapid opening (pop action for
3.1.2 accumulation pressure, n—the set pressure plus the
gas, vapor, or steam) or gradual opening (for liquids).
accumulation. Accumulation pressure is expressed in pound-
3.1.14 primary and secondary pressure zones of pressure
force per square inch gauge.
relief valve, n—primary pressure zone refers to all portions of
3.1.3 blowdown, n—the difference between the set pressure
the pressure-containing envelope subject to inlet pressure;
and the reseating pressure. Blowdown is expressed in pound-
secondary pressure zone refers to all portions of the pressure-
containing envelope subject to outlet or discharge pressure
(includes spring housing of nonvented valves).
Available from American Society of Mechanical Engineers (ASME), ASME
International Headquarters, Two Park Ave., New York, NY 10016-5990, http://
3.1.15 relieving capacity (also called flow capacity), n—the
www.asme.org.
pressure relief valve is defined as the quantity of pressure
Available from DLA Document Services, Building 4/D, 700 Robbins Ave.,
Philadelphia, PA 19111-5094, http://quicksearch.dla.mil. medium relieving through the pressure relief valve at the
F1508−96 (2021)
accumulationpressure,suchaspoundperhourofsteam,gallon 5. Ordering Information
per minute of water at 70°F, or SCFM (standard cubic feet per
5.1 Ordering documentation for valves under this specifica-
minute at 60°F and 14.7 psia) of air, as applicable.
tion shall include the following information, as required, to
describe the equipment adequately.
3.1.16 set pressure, n—the value of increasing inlet static
5.1.1 ASTM designation and year of issue.
pressure at which a pressure relief valve displays one of the
5.1.2 Valve specification code (see 6.2).
operational characteristics as defined under opening pressure,
5.1.3 Quantity of valves.
or start-to-leak pressure. Set pressure is expressed in pound-
5.1.4 Maximum inlet temperature.
force per square inch gauge.
5.1.5 Set pressure.
3.1.17 set pressure range, n—the range over which the set
5.1.6 Requiredrelievingcapacity(flow)attheaccumulation
pressure can be adjusted with the installed spring.
pressure.
5.1.7 Installation limitations data, if different than specified
3.1.18 set pressure tolerance, n—the permissible plus or
in 7.9.
minus deviation from the specified set pressure. Set pressure
5.1.8 Blowdown limits, if different than specified in 7.7.
tolerance is expressed in pound-force per square inch or as a
5.1.9 Envelope dimensions, if not covered in Table 13 and
percent of the set pressure.
Table 14.
3.1.19 source, n—when used in this specification, refers to
5.1.10 Supplementary requirements, if any (see S1 through
the pressure container being protected from overpressure by
S5).
the pressure relief valve, for example, piping main, pressure
6. Valve Coding and Construction
vessel or tank, casing, and so forth.
6.1 Valves shall incorporate the design features specified in
3.1.20 start-to-leak pressure, n—the value of increasing
6.2 and 6.3.
inlet static pressure at which the first bubble occurs when a
pressure relief valve for compressible fluid service of the
6.2 Valve Specification Coding—Basicvalvedesignfeatures
resilient disk design is tested by means of air under a specified
shall be specified and recorded using the following valve
water seal on the outlet.
coding system. The valve specification code contains nine
fields of information, which describe the construction features
3.1.21 superimposedbackpressure,n—thestaticpressureon
of the valve. Each of these nine fields are further assigned their
thedischargesideofapressurereliefvalvepriortotheopening
respective codes in accordance with Tables 1-7.
of the pressure relief valve. This pressure exists where the
pressure relief valve discharges into a common pipeline shared
with other pressure sources such as pressure relief valves, or
intoapressurizedorclosedsystem.Thispressuremayhavethe
effect of changing the set pressure of the pressure relief valve.
3.1.22 top-guided valve, n—this type of valve has all the
guiding, rubbing, or contacting surfaces on the discharge side
of the seat.
4. Classification
6.3 Construction—Valve construction shall be in accor-
4.1 Pressurereliefvalvesshallbeofthefollowingtypesand
dance with the requirements specified in 6.3.1 – 6.3.19.
material grades:
6.3.1 The materials of construction for various valve com-
4.1.1 Type I—For Steam Service:
ponentsaredetailedinTable8forTypeIvalvesandTable9for
4.1.1.1 Grade A—Alloy steel construction (for steam ser-
Types II and III valves.
vice temperatures up to 1000°F) (see Table 8).
6.3.2 General Requirements—The valve shall be self-
4.1.1.2 Grade B—Carbon steel construction (for steam ser- contained, single-seated, and spring-loaded where the inlet
pressure is directly sensed under the spring-loaded disk. The
vice temperatures up to 775°F) (see Table 8).
valve shall incorporate only a single inlet and a single outlet
4.1.2 Type II—For Air, Gas Service:
connection.
4.1.2.1 Grade C—Bronze or stainless steel construction (for
air, gas service excluding oxygen) (see Table 9).
TABLE 1 Valve Type and Material Code
4.1.2.2 Grade D—Ni-Cu alloy construction (for oxygen)
Valve Classification
Valve Type and Material
(see Table 9).
Code
Valve Type Material Grade
4.1.3 Type III—For Liquid Service (except hydraulic oil):
IA 1
IB 2
4.1.3.1 Grade E—Ferrous construction (for noncorrosive
II C 3
liquids, such as fuel oil, water, steam condensate, and so forth)
II D 4
III E 5
(see Table 9).
III F 6
4.1.3.2 Grade F—Nonferrous construction (for corrosive
As specified As specified 9
liquids, such as seawater, and so forth) (see Table 9).
F1508−96 (2021)
TABLE 2 Codes for Valve In
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