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ASTM F 1802 Document Information:
Title
Standard Test Method for Performance Testing of Excess Flow Valves
ASTM International
Publication Date:
Apr 1, 2004
Scope:
This test method covers a standardized method to determine the
performance of excess flow valves
(EFVs) designed to limit flow or stop flow in thermoplastic natural
gas service lines.(Footnote 2)
All tests are intended to be performed using air as the test fluid.
Unless otherwise stated, all
flow rates are reported in standard cubic feet per hour of 0.6
relative density natural gas.
The test method recognizes two types of EFV. One type, an excess flow
valve-bypass (EFVB), allows a
small amount of gas to bleed through (bypass) after it has tripped,
usually as a means of
automatically resetting the device. The second type, an excess flow
valve-non bypass (EFVNB), is
intended to trip shut forming an essentially gas tight seal.
The performance characteristics covered in this test method include
flow at trip point, pressure
drop across the EFV, bypass flow rate of the EFVB or leak rate through
the EFVNB after trip, and
verification that the EFV can be reset.
Gas distribution systems may contain condensates and particulates such
as organic matter, sand,
dirt, and iron compounds. Field experience has shown that the
operating characteristics of some
EFVs may be affected by accumulations of these materials. The tests of
Section 11 were developed to
provide a simple, inexpensive, reproducible test that quantifies the
effect, if any, of a uniform
coating of kerosene and of kerosene contaminated with a specified
amount of ferric oxide powder on
an EFV's operating characteristics.
Excess flow valves covered by this test method will normally have the
following characteristics: a
pressure rating of up to 125 psig (0.86 MPa); a trip flow of between
200 and 2500 ft³/h (5.66
and 70.8 m³/h) at 10 psig (0.07 MPa); a minimum temperature
rating of
0°F(−18°C), and a maximum temperature rating of
100°F (38°C).
The EFVs covered by this test method shall be constructed to fit
piping systems no smaller than
½ CTS and no larger than 1¼ IPS, including both pipe and
tubing sizes.
Tests will be performed at 67 ± 10°F (19.4 ±
5.5°C). Alternative optional
test temperatures are 100 ± 10°F (37.7 ± 5.5°C)
and 0 ± 10°F
(−18 ± 5.5°C). All flow rates must be corrected to
standard conditions.
This test method was written for EFVs installed in thermoplastic
piping systems. However, it is
expected that the test method may also be used for similar devices in
other piping systems.
This standard does not purport to address all of the safety concerns,
if any, associated with its
use. It is the responsibility of the user of this standard to
establish appropriate safety and
health practices and determine the applicability of regulatory
limitations prior to use. For
specific precautions, see Section 8.
Footnote 2 - This contamination test procedure may be utilized to
determine the effect, if any, of
contaminants from a specific gas distribution system on the
operational characteristics of an EFV
under consideration for use in that system. Condensates, oils and
particulates removed from that
distribution system could be substituted for kerosene and iron oxide.
Results obtained from using
reagents or contaminants other than those specified in this test
method must not be used in
comparison with results obtained using the reagents specified in this
test method.
Keywords:
- excess flow valve (EFV)
- excess flow valve bypass (EFVB)
- excess flow valve non-bypass (EFVNB)
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