ASTM E144-94(1995)

NOTICE: This standard has either been superseded and replaced by a new version or discontinued.
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Designation: E 144 – 94 (Reapproved 1995) An American National Standard
Standard Practice for
Safe Use Of Oxygen Combustion Bombs
This standard is issued under the fixed designation E 144; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope exceed 80 % of the manufacturer’s stated corrosion allowance
for the bomb.
1.1 This practice covers methods for judging the soundness
2.2.5 Any change in thread tolerances of bomb enclosures
of new and used oxygen combustion bombs, and describes the
which exceed the manufacturer’s specifications.
precautions to be observed in oxygen bomb combustion
methods.
3. Hydrostatic Test
1.2 This practice is applicable to all procedures in which
3.1 Fill the bomb with water at room temperature and
samples are completely oxidized by combustion in a metal
connect to a suitable hydraulic pressure system. Be sure that all
bomb containing oxygen under pressure. Where there is
air has been displaced from the bomb and from the connecting
conflict with specific precautions in individual ASTM methods,
gas passages. Support the bomb so that the diameter at the
the latter shall take precedence.
midsection of the cylinder can be measured with a micrometer
1.3 The values stated in inch-pound units are to be regarded
caliper, and the deflection at the center point of the bottom can
as the standard. The metric equivalent of inch-pound units may
be measured with a micrometer dial indicator. Apply water
be approximate.
pressure which is 1.5 times the manufacturer’s recommended
1.4 This standard does not purport to address all of the
working pressure test pressure of the bomb and check the bomb
safety concerns, if any, associated with its use. It is the
and pressure connections for leaks.
responsibility of the user of this standard to establish appro-
3.2 With the hydraulic system at atmospheric pressure,
priate safety and health practices and determine the applica-
measure the diameter at the midsection of the cylinder and
bility of regulatory limitations prior to use.
obtain a zero reading for the dial indicator in contact with the
2. Physical Requirements center point of the bottom of the bomb. Raise the hydrostatic
pressure to test pressure and repeat these measurements, then
2.1 Initial Test—The manufacturer of oxygen combustion
release the pressure and take a third set of measurements with
bombs for use in ASTM test methods shall furnish a certificate
the system at atmospheric pressure. If the application of test
with each new bomb showing that it has satisfactorily passed
pressure produces a deflection greater than 0.005 in. (0.127
the hydrostatic and proof tests described in Sections 3 and 4.
mm) at the midsection of the cylinder or at the center point of
When requested, the manufacturer shall supply evidence that
the bottom of the bomb, or if any of the bomb parts do not
the bomb is designed and constructed in accordance with
resume their original dimensions when pressure is released,
recognized practices for pressure vessel equipment.
reject the bomb as unsafe.
2.2 Periodic Inspection—All seals and other parts that are
recommended by the manufacturer shall be replaced or re-
4. Proof Test
newed after each 5000 firing or at a more frequent interval if
4.1 Record the outside diameter at the midsection of the
the seals or other parts show evidence of deterioration. The
bomb cylinder as measured with a micrometer caliper, then
hydrostatic and proof tests described in Sections 3 and 4 shall
assemble the bomb for firing with a tablet or pellet of
be repeated if any of the following have occurred:
compressed benzoic acid that gives an energy release that is 1.5
2.2.1 Five thousand firings.
times the manufacturer’s recommended energy release limit.
2.2.2 Firing with an excessive charge of either sample or
Admit oxygen slowly to an initial pressure that represents the
oxygen.
manufacturer’s maximum charging pressure, then submerge
2.2
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