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ASTM G 175 Document Information:
Title
Standard Test Method for Evaluating the Ignition Sensitivity and Fault Tolerance of Oxygen Regulators Used for Medical and Emergency Applications
ASTM International
Publication Date:
Apr 10, 2003
Scope:
This standard describes a test method for evaluating the ignition
sensitivity and fault tolerance
of oxygen regulators used for medical and emergency applications.
For the purpose of this standard, a pressure regulator is a device,
also called a pressure-reducing
valve, that is intended for medical or emergency purposes and that is
used to convert a medical or
emergency gas pressure from a high, variable pressure to a lower, more
constant working pressure
[21 CFR 868.2700 (a)].
This standard applies only to oxygen regulators used for medical and
emergency applications that
are designed and fitted with CGA 540 inlet connections or CGA 870
pin-index adapters (CGA V-1).
This standard provides an evaluation tool for determining the fault
tolerance of oxygen regulators
used for medical and emergency applications. A fault tolerant
regulator is defined as (1) having a
low probability of ignition as evaluated by rapid pressurization
testing, and (2) having a low
consequence of ignition as evaluated by forced ignition testing.
This standard is not a design standard; however, it can be used to aid
designers in designing and
evaluating the safe performance and fault tolerance capability of
oxygen regulators used for
medical and emergency applications (G 128).
NOTE 1 - It is essential that a risk assessment be carried out on
breathing gas systems, especially
concerning oxygen compatibility (refer to ASTM G 63 and G 94) and
toxic product formation due to
ignition or decomposition of nonmetallic materials as weighed against
the risk of flammability
(refer to ISO 15001.2). See Appendix X1 and X2.1 for details.
This standard is also used to aid those responsible for purchasing or
using oxygen regulators used
for medical and emergency applications in ensuring that selected
regulators are tolerant of the
ignition mechanisms that are normally active in oxygen systems.
This standard does not purport to address the ignition sensitivity and
fault tolerance of an oxygen
regulator caused by contamination during field maintenance or use.
Regulator designers and
manufacturers should provide design safeguards to minimize the
potential for contamination or its
consequences (G 88).
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.
Keywords:
- fault tolerance
- forced ignition
- ignition
- ignition sensitivity
- impact test
- medical oxygen regulator
- oxygen pressure shock test
- oxygen regulator
- promoted ignition
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