ASTM F1508-96(2004)
(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).
General Information
Relations
Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information.
An American National Standard
Designation: F1508 – 96 (Reapproved 2004)
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 A313/A313M Specification for Stainless Steel Spring Wire
A351/A351M Specification for Castings, Austenitic, for
1.1 This specification covers spring-loaded, angle style,
Pressure-Containing Parts
pressure relief valves for steam, gas, and liquid system
A479/A479M Specification for Stainless Steel Bars and
applications (excluding boiler safety and hydraulic system
Shapes for Use in Boilers and Other Pressure Vessels
relief valves).
A494/A494M Specification for Castings, Nickel and Nickel
2. Referenced Documents
Alloy
A689 Specification for Carbon and Alloy Steel Bars for
2.1 ASTM Standards:
Springs
A105/A105M Specification for Carbon Steel Forgings for
B21/B21M Specification for Naval Brass Rod, Bar, and
Piping Applications
Shapes
A125 Specification for Steel Springs, Helical, Heat-Treated
B61 Specification for Steam or Valve Bronze Castings
A182/A182M Specification for Forged or RolledAlloy and
B62 Specification for Composition Bronze or Ounce Metal
Stainless Steel Pipe Flanges, Forged Fittings, and Valves
Castings
and Parts for High-Temperature Service
B148 Specification for Aluminum-Bronze Sand Castings
A193/A193M Specification for Alloy-Steel and Stainless
B164 Specification for Nickel-Copper Alloy Rod, Bar, and
Steel Bolting Materials for High Temperature or High
Wire
Pressure Service and Other Special Purpose Applications
B637 Specification for Precipitation-Hardening Nickel Al-
A194/A194M Specification for Carbon and Alloy Steel
loy Bars, Forgings, and Forging Stock for High-
Nuts for Bolts for High Pressure or High Temperature
Temperature Service
Service, or Both
D5204 Classification System for Polyamide-Imide (PAI)
A216/A216M Specification for Steel Castings, Carbon,
Molding and Extrusion Materials
Suitable for Fusion Welding, for High-Temperature Ser-
F467 Specification for Nonferrous Nuts for General Use
vice
F468 Specification for Nonferrous Bolts, Hex Cap Screws,
A217/A217M Specification for Steel Castings, Martensitic
and Studs for General Use
Stainless and Alloy, for Pressure-Containing Parts, Suit-
2.2 ANSI Standards:
able for High-Temperature Service
ANSI B.1 Unified Screw Threads
A227/A227M Specification for Steel Wire, Cold-Drawn for
ANSI B16.5 Pipe Flanges and Flanged Fittings
Mechanical Springs
ANSI B16.34 Valves—Flanged, Threaded, and Welding
A229/A229M Specification for Steel Wire, Oil-Tempered
End
for Mechanical Springs
2.3 ASME Standard:
A231/A231M Specification for Chromium-VanadiumAlloy
Boiler and Pressure Vessel Code
Steel Spring Wire
2.4 API Standards:
A276 Specification for Stainless Steel Bars and Shapes
API Standard 526 Flanged Steel Safety-Relief Valves
API Standard RP 520, Part 1 Recommended Practice for
the Design and Installation of Pressure-Relieving Systems
This specification is under the jurisdiction of ASTM Committee F25 on Ships
in Refineries
and Marine Technology and is the direct responsibility of Subcommittee F25.11 on
Machinery and Piping Systems.
Current edition approved May 1, 2004. Published May 2004. Originally
approved in 1996. Last previous edition approved in 1996 as F1508 – 96. DOI: Available fromAmerican National Standards Institute (ANSI), 25 W. 43rd St.,
10.1520/F1508-96R04. 4th Floor, New York, NY 10036.
2 4
For referenced ASTM standards, visit the ASTM website, www.astm.org, or Available from American Society of Mechanical Engineers (ASME), ASME
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM International Headquarters, Three Park Ave., New York, NY 10016-5990.
Standards volume information, refer to the standard’s Document Summary page on Available from The American Petroleum Institute (API), 1220 L. St., NW,
the ASTM website. Washington, DC 20005.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
F1508 – 96 (2004)
2.5 Federal Specifications: 3.1.6 gagging device—a device, normally a screw (also
QQ-N-281 Nickel-Copper Alloy Bar, Rod, Plate, Sheet, called test gag), used to prevent the pressure relief valve from
Strip, Wire, Forgings, and Structural and Special Shaped opening during a hydrostatic pressure test of the equipment on
Sections which it is installed.
QQ-N-286 Nickel-Copper-Aluminum Alloy, Wrought
3.1.7 inlet piping—when used in this specification, refers to
(UNS N05500)
all piping and fittings between the source and the inlet
2.6 Military Standards and Specifications:
connection to the pressure relief valve.
MIL-STD-167-1 Mechanical Vibrations of Shipboard
3.1.8 instability (chatter, flutter)—an unstable operation of
Equipment (Type I—Environmental and Type II—
the pressure relief valve characterized by rapid seating and
Internally Excited)
unseating of the disk during discharge. This hammering of the
MIL-STD-1330 Cleaning and Testing of Shipboard Oxy-
disk on the seat can cause high loading forces, which can lead
gen, Nitrogen and Hydrogen Gas Piping Systems
to damage and rapid failure of the seating and sliding surfaces.
MIL-F-1183 Fittings, Pipe, Cast Bronze, Silver Brazing,
3.1.9 maximum system operating pressure—the highest
General Specification for
pressure that can exist in a system, vessel, or component under
MIL-F-20042 Flanges, Pipe and Bulkhead, Bronze (Silver
normal (noncasualty) operating conditions. This is a normal
Brazing)
(noncasualty) pressure that the pressure relief valve is not
MIL-P-46122 Plastic Molding Material and Plastic Extru-
intended to protect against. This pressure can be the result of
sion Material, Polyvinylidene Fluoride Polymer and Co-
influences such as pump or compressor shutoff pressure,
polymer
pressure regulating valve lockup (no flow) pressure, and so
MIL-R-17131 Rods, Welding, Surfacing
forth.
MIL-S-901 Shock Tests, H.I. (High-Impact); Shipboard
3.1.10 opening pressure—the value of increasing inlet
Machinery, Equipment and Systems, Requirements for
static pressure of a pressure relief valve at which there is a
MS 16142 Boss, Gasket-Seal Straight Thread Tube Fitting,
measurable lift, or at which the discharge becomes continuous
Standard Dimensions for
by seeing, feeling, or hearing.
MS 51840 Plug, Machine Thread, O-ring
3.1.11 outlet piping (or discharge piping)—when used in
2.7 Naval Sea Systems Command (NAVSEA):
this specification, refers to all piping and fittings between the
Drawings:
pressure relief valve outlet connection and the main, tank, or
803-1385884 Unions, Fittings and Adapters, Butt and
atmosphere to which the pressure relief valve relieves.
Socket Welding, 6000 PSI, WOG IPS
3.1.12 popping pressure—thevalueofincreasinginletstatic
803-1385943 Unions, Silver Brazing, 3000 PSI, WOG IPS,
pressure at which the disk moves in the opening direction at a
for UT Inspection
faster rate as compared with the corresponding movement at
803-1385946 Unions, Bronze Silver Brazing,WOG, for UT
higher or lower pressures. It generally applies to valves with
Inspection
compressible fluid service such as steam, gas, and so forth.
3.1.13 pressure relief valve—an automatic pressure reliev-
3. Terminology
ing device actuated by the static pressure upstream of the valve
3.1 Definitions: and characterized by either rapid opening (pop action for gas,
3.1.1 accumulation—the increase in static pressure above vapor, or steam) or gradual opening (for liquids).
the set pressure during discharge through the valve, when the 3.1.14 primary and secondary pressure zones of pressure
valve passes the rated flow. Accumulation is expressed in
relief valve—primary pressure zone refers to all portions of the
pound-force per square inch or as a percent of the set pressure. pressure-containing envelope subject to inlet pressure; second-
3.1.2 accumulation pressure—the set pressure plus the ac-
ary pressure zone refers to all portions of the pressure-
cumulation. Accumulation pressure is expressed in pound- containing envelope subject to outlet or discharge pressure
force per square inch gage.
(includes spring housing of nonvented valves).
3.1.3 blowdown—the difference between the set pressure
3.1.15 relieving capacity (also called flow capacity)—the
and the reseating pressure. Blowdown is expressed in pound-
pressure relief valve is defined as the quantity of pressure
force per square inch or a percent of the set pressure. The
medium relieving through the pressure relief valve at the
accumulation and blowdown establish the operating band of
accumulationpressure,suchaspoundperhourofsteam,gallon
the pressure relief valve at a particular set pressure.
per minute of water at 70°F, or SCFM (standard cubic feet per
3.1.4 blowdown pressure—the set pressure minus the blow-
minute at 60°F and 14.7 psia) of air, as applicable.
down. Blowdown pressure is expressed in pound-force per
3.1.16 set pressure—the value of increasing inlet static
square inch gage.
pressure at which a pressure relief valve displays one of the
3.1.5 built-upbackpressure—thestaticdischargepressureat
operational characteristics as defined under opening pressure,
the outlet of a pressure relief valve caused by the pressure drop
or start-to-leak pressure. Set pressure is expressed in pound-
in the discharge piping while the valve is discharging.
force per square inch gage.
3.1.17 set pressure range—the range over which the set
pressure can be adjusted with the installed spring.
3.1.18 set pressure tolerance—the permissible plus or mi-
AvailablefromStandardizationDocumentsOrderDesk,Bldg.4SectionD,700
Robbins Ave., Philadelphia, PA 19111-5094, Attn: NPODS. nus deviation from the specified set pressure. Set pressure
F1508 – 96 (2004)
tolerance is expressed in pound-force per square inch or as a 5.1.10 Supplementary requirements, if any (see S1 through
percent of the set pressure. S5).
3.1.19 source—when used in this specification, refers to the
6. Valve Coding and Construction
pressure container being protected from overpressure by the
pressure relief valve, for example, piping main, pressure vessel
6.1 Valves shall incorporate the design features specified in
or tank, casing, and so forth.
6.2 and 6.3.
3.1.20 start-to-leak pressure—the value of increasing inlet
6.2 Valve Specification Coding—Basic valve design fea-
static pressure at which the first bubble occurs when a pressure
tures shall be specified and recorded using the following valve
relief valve for compressible fluid service of the resilient disk
coding system. The valve specification code contains nine
design is tested by means of air under a specified water seal on
fields of information, which describe the construction features
the outlet.
of the valve. Each of these nine fields are further assigned their
3.1.21 superimposed backpressure—the static pressure on
respective codes in accordance with Tables 1-7.
thedischargesideofapressurereliefvalvepriortotheopening
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—this type of valve has all the
guiding, rubbing, or contacting surfaces on the discharge side
of the seat.
6.3 Construction—Valve construction shall be in accor-
4. Classification
dance with the requirements specified in 6.3.1-6.3.19.
4.1 Pressurereliefvalvesshallbeofthefollowingtypesand
6.3.1 The materials of construction for various valve com-
material grades:
ponentsaredetailedinTable8forTypeIvalvesandTable9for
4.1.1 Type I—For Steam Service:
Types II and III valves.
4.1.1.1 Grade A—Alloy steel construction (for steam ser-
6.3.2 General Requirements—The valve shall be self-
vice temperatures up to 1000°F) (see Table 8).
contained, single-seated, and spring-loaded where the inlet
4.1.1.2 Grade B—Carbon steel construction (for steam
pressure is directly sensed under the spring-loaded disk. The
service 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—Bronzeorstainlesssteelconstruction(for
6.3.3 Pressure-Temperature Ratings—The pressure-
air, gas service excluding oxygen) (see Table 9).
temperature ratings of a pressure relief valve consist of ratings
4.1.2.2 Grade D—Ni-Cu alloy construction (for oxygen)
for the primary and secondary pressure zones.
(see Table 9).
6.3.3.1 Pressure-Temperature Rating of the Primary Pres-
4.1.3 Type III—For Liquid Service (except hydraulic oil):
sure Zone—This shall correspond to the rating of the inlet end
4.1.3.1 Grade E—Ferrous construction (for noncorrosive
connection, and is given in Table 10.
liquids, such as fuel oil, water, steam condensate, and so forth)
6.3.3.2 Pressure-TemperatureRatingoftheSecondaryPres-
(see Table 9).
sure Zone—The secondary pressure zone shall withstand the
4.1.3.2 Grade F—Nonferrous construction (for corrosive
higher of the following:
liquids, such as seawater, and so forth) (see Table 9).
(1) 150 % of maximum backpressure buildup specified in
7.9.
5. Ordering Information
(2) 600 psig (for Type II, Grade C and Type III, Grade F
5.1 Ordering documentation for valves under this specifica-
valves only).
tion shall include the following information, as required, to
(3) ANSI B16.34, Class 150 pressure rating (for Type I,
describe the equipment adequately.
Grades A and B and Type III, Grade E valves only).
5.1.1 ASTM designation and year of issue.
5.1.2 Valve specification code (see 6.2).
TABLE 1 Valve Type and Material Code
5.1.3 Quantity of valves.
5.1.4 Maximum inlet temperature.
Valve Classification
Valve Type and Material
5.1.5 Set pressure.
Code
Valve Type Material Grade
5.1.6 Requiredrelievingcapacity(flow)attheaccumulation
IA 1
pressure.
IB 2
5.1.7 Installation limitations data, if different than specified
II C 3
in 7.9.
II D 4
III E 5
5.1.8 Blowdown limits, if different than specified in 7.7.
III F 6
5.1.9 Envelope dimensions, if not covered in Table 13 and
As specified as specified 9
Table 14.
F1508 – 96 (2004)
TABLE 2 Codes for Valve Inlet/Outlet Pipe Size
Nominal valve inlet or
As
outlet pipe size, in. 0.25 0.38 0.50 0.75 1.00 1.25 1.
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.