ASTM E144-94(2006)e1
(Practice)Standard Practice for Safe Use of Oxygen Combustion Bombs
Standard Practice for Safe Use of Oxygen Combustion Bombs
ABSTRACT
This practice covers methods for judging the soundness of new and used oxygen combustion bombs, and describes the precautions to be observed in oxygen bomb combustion methods. This practice is applicable to all procedures in which samples are completely oxidized by combustion in a metal bomb containing oxygen under pressure. Hydrostatic test and proof test shall be performed. The following precautions shall be observed in all oxygen bomb combustion methods: sample weight; oxygen filling system; ignition system; and safety barricade.
SCOPE
1.1 This practice covers methods for judging the soundness of new and used oxygen combustion bombs, and describes the precautions to be observed in oxygen bomb combustion methods.
1.2 This practice is applicable to all procedures in which samples are completely oxidized by combustion in a metal bomb containing oxygen under pressure. Where there is conflict with specific precautions in individual ASTM methods, the latter shall take precedence.
1.3 The values stated in inch-pound units are to be regarded as the standard. The metric equivalent of inch-pound units may be approximate.
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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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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´1
Designation:E144–94(Reapproved 2006)
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.
´ NOTE—The warning note was editorially moved into 4.1 in December 2006.
1. Scope 2.2.3 Ignition of any internal part of the bomb, including
fuel capsule.
1.1 This practice covers methods for judging the soundness
2.2.4 The evidence of corrosion or surface defects which
of new and used oxygen combustion bombs, and describes the
exceed 80 % of the manufacturer’s stated corrosion allowance
precautions to be observed in oxygen bomb combustion
for the bomb.
methods.
2.2.5 Any change in thread tolerances of bomb enclosures
1.2 This practice is applicable to all procedures in which
which exceed the manufacturer’s specifications.
samples are completely oxidized by combustion in a metal
bomb containing oxygen under pressure. Where there is
3. Hydrostatic Test
conflictwithspecificprecautionsinindividualASTMmethods,
3.1 Fill the bomb with water at room temperature and
the latter shall take precedence.
connect to a suitable hydraulic pressure system. Be sure that all
1.3 The values stated in inch-pound units are to be regarded
air has been displaced from the bomb and from the connecting
as the standard.The metric equivalent of inch-pound units may
gas passages. Support the bomb so that the diameter at the
be approximate.
midsection of the cylinder can be measured with a micrometer
1.4 This standard does not purport to address all of the
caliper, and the deflection at the center point of the bottom can
safety concerns, if any, associated with its use. It is the
be measured with a micrometer dial indicator. Apply water
responsibility of the user of this standard to establish appro-
pressure which is 1.5 times the manufacturer’s recommended
priate safety and health practices and determine the applica-
workingpressuretestpressureofthebombandcheckthebomb
bility of regulatory limitations prior to use.
and pressure connections for leaks.
2. Physical Requirements 3.2 With the hydraulic system at atmospheric pressure,
measure the diameter at the midsection of the cylinder and
2.1 Initial Test—The manufacturer of oxygen combustion
obtain a zero reading for the dial indicator in contact with the
bombs for use inASTM test methods shall furnish a certificate
center point of the bottom of the bomb. Raise the hydrostatic
with each new bomb showing that it has satisfactorily passed
pressure to test pressure and repeat these measurements, then
the hydrostatic and proof tests described in Sections 3 and 4.
release the pressure and take a third set of measurements with
When requested, the manufacturer shall supply evidence that
the system at atmospheric pressure. If the application of test
the bomb is designed and constructed in accordance with
pressure produces a deflection greater than 0.005 in. (0.127
recognized practices for pressure vessel equipment.
mm) at the midsection of the cylinder or at the center point of
2.2 Periodic Inspection—All seals and other parts that are
the bottom of the bomb, or if any of the bomb parts do not
recommended by the manufacturer shall be replaced or re-
resume their original dimensions when pressure is released,
newed after each 5000 firing or at a more frequent interval if
reject the bomb as unsafe.
the seals or other parts show evidence of deterioration. The
hydrostatic and proof tests described in Sections 3 and 4 shall
4. Proof Test
be repeated if any of the following have occurred:
4.1 Record the outside diameter at the midsection of the
2.2.1 Five thousand firings.
bomb cylinder as measured with a micrometer caliper, then
2.2.2 Firing with an excessive charge of either sample or
assemble the bomb for firing with a tablet or pellet of
oxygen.
compressedbenzoicacidthatgivesanenergyreleasethatis1.5
times the manufacturer’s recommended energy releas
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