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ASTM F 2023 Document Information:
Title
Standard Test Method for Evaluating the Oxidative Resistance of Crosslinked Polyethylene (PEX) Tubing and Systems to Hot Chlorinated Water
ASTM International
Publication Date:
Mar 1, 2008
Scope:
This test method describes the general requirements for
evaluating the long-term, chlorinated water, oxidative resistance
of cross-linked polyethylene (PEX) tubing produced in accordance
with Specification F 876 or PEX tubing/fitting systems in
accordance with Specification F 877 used in hotand- cold water
distribution systems by exposure to hot, chlorinated water. This
test method outlines the requirements of a pressurized flow-through
test system, typical test pressures, test-fluid characteristics,
failure type, and data analysis.
NOTE 1—Other known disinfecting systems (chlorine dioxide,
ozone, and chloramines) are also used for protection of potable
water. Freechlorine is the most common disinfectant in use today. A
PPI research project examined the relative aggressiveness of free
chlorine and chloramines on PEX pipes, both a the same 4.0 ppm
concentration and the same test temperatures. The results of the
testing showed pipe failure times approximately 40% longer when
tested with chloramines compared to testing with free chlorine, at
the tested conditions. Based on these results, the data suggests
that chloramines are less aggressive than free chlorine to PEX
pipes.
Guidelines and requirements for test temperatures, test hoop
stresses, and other test criteria have been established by prior
testing of PEX tubing produced by the three most common commercial
methods of cross-linking: silane, peroxide, and electron-beam (see
Note 2). Other related system components that typically appear in a
PEX hot-and-cold water distribution system can be evaluated with
the PEX tubing. When testing PEX tubing and fittings as a system,
it is recommended that the anticipated end-use fitting type(s) and
material(s) be included in the test circuit since it is known that
some fitting types and materials can impact failure times.
Specimens used shall be representative of the piping product(s) and
material(s) under investigation.
NOTE 2—The procedures described in this test method (with some
modifications of test temperatures or stresses, or both) have been
used to evaluate pipes manufactured from polybutylene (PB),
polyethylene (PE), polypropylene (PP), multilayer (polymer-metal
composite), copper, and stainless steel.
This test method is applicable to PEX tubing and systems used
for transport of potable water containing freechlorine for
disinfecting purposes. The oxidizing potential of the test-fluid
specified in this test method exceeds that typically found in
potable water systems across the United States.
The values stated in inch-pound units are to be regarded as the
standard. The values given in parentheses are for information
purposes.
The following precautionary caveat pertains only to the test
method portion, Section 12, of this specification. 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.
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