ASTM F2138-12(2017)

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: F2138 −12 (Reapproved 2017) An American National Standard
Standard Specification for
Excess Flow Valves for Natural Gas Service
This standard is issued under the fixed designation F2138; 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* mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee.
1.1 This specification covers requirements and test methods
for excess flow valves for use in thermoplastic natural gas
2. Referenced Documents
piping systems. However, it is expected that excess flow valves
manufacturedtotherequirementsofthisspecificationmayalso 2.1 ASTM Standards:
be used in other natural gas piping systems. D1600 Terminology forAbbreviatedTerms Relating to Plas-
tics
1.2 Excess flow valves covered by this specification are
F412 Terminology Relating to Plastic Piping Systems
designed for insertion into components for natural gas systems
F1802 Test Method for Performance Testing of Excess Flow
such as pipe, tubing, or fittings in sizes from ⁄2 CTS to 2 IPS.
Valves
1.3 The tests required by this specification are intended to
F2897 Specification for Tracking and Traceability Encoding
determine the performance characteristics of an excess flow
System of Natural Gas Distribution Components (Pipe,
valve installed in a straight piece of pipe.An excess flow valve
Tubing, Fittings, Valves, and Appurtenances)
could possibly be installed in a straight piece of pipe, in a
service tee outlet, as part of a mechanical coupling, or in other
3. Terminology
configurations. The performance characteristics of the excess
3.1 Definitions:
flow valve may be significantly different for each installed
3.1.1 Definitions are in accordance with Terminology F412,
configuration. Users should conduct their own tests to deter-
unless otherwise specified. Abbreviations are in accordance
mine the installed performance characteristics or contact the
with Terminology D1600.
EFV manufacturer for test data for the installed configuration.
3.1.2 bypass flow, n—an intentional rate of passage of
Additional guidance on selection and installation of excess
natural gas through an EFVB after trip, which will allow
flow valves is included in Appendix X1.
upstream and downstream pressure to equalize across the
1.4 The tests required by this specification are not intended
device to automatically reset to the open position after removal
to be routine quality control tests.
of a fault condition.
1.5 The values stated in inch-pound units are to be regarded
3.1.3 excess flow valve, EFV, n—a device installed in a
as standard. The values given in parentheses are mathematical
natural gas piping system to automatically stop or limit the
conversions to SI units that are provided for information only
passage of natural gas when the rate of passage of natural gas
and are not considered standard.
through the device exceeds a predetermined level.
1.6 This standard does not purport to address all of the
3.1.4 excess flow valve bypass, EFVB, n—an EFV designed
safety concerns, if any, associated with its use. It is the
to limit the flow of gas after trip to a small predetermined level
responsibility of the user of this standard to establish appro-
and to reset automatically after the pressure is equalized across
priate safety, health and environmental practices and deter-
the valve.
mine the applicability of regulatory limitations prior to use.
3.1.5 excess flow valve non-bypass, EFVNB, n—an EFV
1.7 This international standard was developed in accor-
designed to stop the flow of gas after trip and to be reset
dance with internationally recognized principles on standard-
manually.
ization established in the Decision on Principles for the
3.1.6 leak rate, n—the flow of natural gas through an
Development of International Standards, Guides and Recom-
EFVNB after trip.
This specification is under the jurisdiction ofASTM Committee F17 on Plastic
Piping Systems and is the direct responsibility of Subcommittee F17.60 on Gas. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved Aug. 1, 2017. Published September 2017. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
approved in 2001. Last previous edition approved in 2012 as F2138–12. DOI: Standards volume information, refer to the standard’s Document Summary page on
10.1520/F2138-12R17. the ASTM website.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
F2138 − 12 (2017)
3.1.7 maximum inlet pressure, n—themaximumpressure,as not exceed 1.5 times the minimum trip flow stated by the EFV
stated by the EFV manufacturer, at which an EFV is designed manufacturer at any given pressure between the minimum and
to function. maximuminletpressures,whentestedinaccordancewith12.2.
9.1.2 Leak Rate—The leak rate of an EFVNB shall not
3.1.8 minimum inlet pressure, n—the minimum pressure, as
3 3
exceed 0.40 standard ft /h (0.011 m /h) when operating be-
stated by the EFV manufacturer, at which an EFV is designed
tween the minimum and maximum inlet pressures, when tested
to function.
in accordance with 12.3.
3.1.9 pipe, n—refers to both pipe and tubing.
9.1.3 Bypass Flow—The bypass flow of an EFVB shall not
3 3
3.1.10 reset, v—changing an EFV from a closed position to
exceed 20 standard ft /h (0.566 m /h) at a 10 psig (0.07 MPa)
an open position.
inletpressure,whentestedinaccordancewith12.4.Atallother
3.1.11 temperature rating, n—the temperature range, as
pressures between the minimum and maximum inlet pressures,
stated by the EFV manufacturer, within which an EFV is
the bypass flow of an EFVB shall not exceed the EFV
designed to function.
manufacturer’s stated value when tested in accordance with
12.4.
3.1.12 trip, n—closure of an EFV.
9.1.4 Pressure Drop—The pressure drop across the EFV
3.1.13 trip flow, n—the rate of passage of natural gas
shall not exceed the maximum pressure drop stated by the EFV
through an EFV that will cause the EFV to stop or limit the
manufacturer at each flow rate listed in Test Method F1802,
passage of natural gas.
section 4.2.3, Pressure Drop at Flow Rates Less than Closure,
and at all inlet pressures between the minimum and maximum
4. Ordering Information
inlet pressures, when tested in accordance with 12.5.
4.1 Purchasers should consider specifying the following
9.1.5 Reset—The EFV shall reset within the parameters
characteristics when ordering an EFV:
stated by the EFV manufacturer at all inlet pressures between
4.1.1 EFVB or EFVNB,
the minimum and maximum inlet pressures, when tested in
4.1.2 Trip flow (see 9.1.1),
accordance with 12.6.
4.1.3 Maximum inlet pressure (see Section 7),
9.1.6 Snap Acting Loads—The EFV shall not close when
4.1.4 Temperature rating range (see Section 8),
tested in accordance with 12.7.
4.1.5 Minimum inlet pressure, and
9.1.7 Cycle Testing—After the cycle testing described in
4.1.6 Special considerations for insertion of EFV.
12.8, the EFVshall meet the requirements of 9.1.1 and 9.1.2 or
5. Materials and Manufacture
9.1.3.
5.1 Thephysicalpropertiesofeachmaterialusedtoproduce
10. Samples
an EFV shall be available from the EFV manufacturer upon
request.
10.1 The minimum sample size for testing against the
performance requirements of 9.1.1 – 9.1.5 shall be 25. The
NOTE 1—Materials in long-term contact with natural gas of line quality
minimum sample size for testing against the performance
should be demonstrated to not adversely affect the performance of the
EFV.
requirements of 9.1.6 and 9.1.7 shall be 6.
NOTE 2—Materials should have a demonstrated resistance to environ-
mental stress cracking when exposed, under stress, to chemical com-
11. Specimen Preparation
pounds encountered in natural gas piping systems. Such compounds
include, but are not limited to, antifreeze solutions used to thaw frozen
11.1 The tests required by this specification shall be per-
lines. The effects of liquid environments such as antifreeze agents,
formed on an EFV inserted in a straight section of pipe. The
odorants, and hydrocarbons are known to be deleterious to some plastics,
EFV shall be centered between the pipe ends. There shall be at
particularly when under service conditions.
leastfivediametersofstraightpipeoneachsideoftheEFV,but
6. Dimensions
the total length of the straight section of pipe shall not exceed
18 in. (45.7 cm).
6.1 The EFVshall be of appropriate dimensions for the pipe
or fitting in which it is intended to be inserted.
12. Test Methods
7. Maximum Inlet Pressure
12.1 General:
7.1 EFVs manufactured under this specification shall have a
12.1.1 EFV testing shall be done in accordance with Test
maximum inlet pressure of at least 125 psig.
Method F1802, unless otherwise specified.
12.1.2 EFVtesting at temperatures other than those listed in
8. Temperature Rating Range
Test Method F1802 may be necessary to establish the EFV
8.1 EFVs manufactured under this specification shall have a
temperature rating.
temperature rating range of -20 to 140°F (-29 to 60°C).
12.2 Trip flow shall be determined as described in Test
Method F1802, section 10.3, on Trip Flow.
9. Design Qualification Requirements
9.1 Performance Requirements: 12.3 Leak rate for an EFVNB shall be determined as
9.1.1 Trip Flow—The trip flow shall not be less than the described in Test Method F1802, section 10.4, Bypass Test or
minimum trip flow stated by the EFV manufacturer and shall Leak Rate Test.
F2138 − 12 (2017)
12.4 Bypass flow for an EFVB shall be determined as 13.2.3 Type of EFV: Bypass (EFVB) or Non By-Pass
described in F1802, section 10.4, Bypass Test or Leak Rate (EFVNB),
Test. 13.2.4 Flow direction arrow,
13.2.5 Nominal pipe size, and
12.5 Pressure Drop:
13.2.6 Coding that will enable the manufacturer to deter-
12.5.1 The pressure drop testing shall be done as described
mine the EFV model as well as the date and location of
in Test Method F1802, section 4.2.3, Pressure Drop at Flow
manufacture.
Rates Less than Closure.
12.5.2 The pressure drop shall be calculated based on test 13.3 If the EFV manufacturer supplies the EFV component
resultsobtainedfromthetestsdescribedinTestMethodF1802. to another manufacturer for assembly into other products, the
In Test Method F1802, section 10.6.1, System Pressure Drop, EFV manufacturer shall supply the information required by
the EFV is replaced by an equivalent length of 1 in. (25.4 mm) 13.2 in an agreed upon format such that it can be placed on the
IPS pipe. However, when using Test Method F1802 to deter- outersurfaceofthefinalpipeorpipingcomponentbytheother
mine the pressure drop across an EFV, the EFV shall be manufacturer.
replacedwiththesamesizeandlengthofpipewithouttheEFV.
13.4 In addition to 13.1, 13.2, and 13.3 as applicable, EFV
To calculate the pressure drop, subtract the system pressure
manufac
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