ASTM E144-94(2011)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation: E144 − 94(Reapproved 2011)
Standard Practice for
Safe Use of Oxygen Combustion Bombs
This standard is issued under the fixed designation E144; 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.
ε NOTE—The warning note was editorially moved into 4.1 in December 2006.
1. Scope 2.2.2 Firing with an excessive charge of either sample or
oxygen.
1.1 This practice covers methods for judging the soundness
2.2.3 Ignition of any internal part of the bomb, including
of new and used oxygen combustion bombs, and describes the
fuel capsule.
precautions to be observed in oxygen bomb combustion
2.2.4 The evidence of corrosion or surface defects which
methods.
exceed 80 % of the manufacturer’s stated corrosion allowance
1.2 This practice is applicable to all procedures in which
for the bomb.
samples are completely oxidized by combustion in a metal
2.2.5 Any change in thread tolerances of bomb enclosures
bomb containing oxygen under pressure. Where there is
which exceed the manufacturer’s specifications.
conflictwithspecificprecautionsinindividualASTMmethods,
the latter shall take precedence.
3. Hydrostatic Test
1.3 The values stated in inch-pound units are to be regarded
3.1 Fill the bomb with water at room temperature and
as the standard.The metric equivalent of inch-pound units may
connect to a suitable hydraulic pressure system. Be sure that all
be approximate. air has been displaced from the bomb and from the connecting
gas passages. Support the bomb so that the diameter at the
1.4 This standard does not purport to address all of the
midsection of the cylinder can be measured with a micrometer
safety concerns, if any, associated with its use. It is the
caliper, and the deflection at the center point of the bottom can
responsibility of the user of this standard to establish appro-
be measured with a micrometer dial indicator. Apply water
priate safety and health practices and determine the applica-
pressure which is 1.5 times the manufacturer’s recommended
bility of regulatory limitations prior to use.
workingpressuretestpressureofthebombandcheckthebomb
2. Physical Requirements and pressure connections for leaks.
3.2 With the hydraulic system at atmospheric pressure,
2.1 Initial Test—The manufacturer of oxygen combustion
bombs for use inASTM test methods shall furnish a certificate measure the diameter at the midsection of the cylinder and
obtain a zero reading for the dial indicator in contact with the
with each new bomb showing that it has satisfactorily passed
the hydrostatic and proof tests described in Sections 3 and 4. center point of the bottom of the bomb. Raise the hydrostatic
pressure to test pressure and repeat these measurements, then
When requested, the manufacturer shall supply evidence that
the bomb is designed and constructed in accordance with release the pressure and take a third set of measurements with
the system at atmospheric pressure. If the application of test
recognized practices for pressure vessel equipment.
pressure produces a deflection greater than 0.005 in. (0.127
2.2 Periodic Inspection—All seals and other parts that are
mm) at the midsection of the cylinder or at the center point of
recommended by the manufacturer shall be replaced or re-
the bottom of the bomb, or if any of the bomb parts do not
newed after each 5000 firing or at a more frequent interval if
resume their original dimensions when pressure is released,
the seals or other parts show evidence of deterioration. The
reject the bomb as unsafe.
hydrostatic and proof tests described in Sections 3 and 4 shall
be repeated if any of the following have occurred:
4. Proof Test
2.2.1 Five thousand firings.
4.1 Record the outside diameter at the midsection of the
bomb cylinder as measured with a micrometer caliper, then
assemble the bomb for firing with a tablet or pellet of
This practice is under the jurisidiction ofASTM Committee E41 on Laboratory
Apparatusand is the direct responsibility of Subcommittee E41.06 on Weighing
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