ASTM E144-14(R2020) pdf free download

ASTM E144-14(R2020) pdf free download.Standard Practice for Safe Use of Oxygen Combustion Vessels
1. Scope
1.1 This practice covers methods for judging the soundness of new and used oxygen combustion vessels, and describes the precautions to be observed in oxygen combustion vessel methods. 1.2 This practice is applicable to all procedures in which samples are completely oxidized by combustion in a metal vessel containing oxygen under pressure. Where there is conflict with specific precautions in individualASTM methods, the latter shall take precedence. 1.3 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. 1.4 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 appro- priate safety, health, and environmental practices and deter- mine the applicability ofregulatory limitations prior to use. 1.5 This international standard was developed in accor- dance with internationally recognized principles on standard- ization established in the Decision on Principles for the Development of International Standards, Guides and Recom- mendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Physical Requirements
2.1 Initial Test—The manufacturer of oxygen combustion vessels for use in ASTM test methods shall furnish a certificate with each new vessel showing that it has satisfactorily passed the hydrostatic and proof tests described in Sections 3 and 4. When requested, the manufacturer shall supply evidence that the vessel is designed and constructed in accordance with recognized practices for pressure vessel equipment. 2.2 Periodic Inspection—All seals and other parts that are recommended by the manufacturer shall be replaced or re- newed after each 5000 firing or at a more frequent interval if the seals or other parts show evidence of deterioration. The hydrostatic and proof tests described in Sections 3 and 4 shall be repeated if any of the following have occurred: 2.2.1 Five thousand firings. 2.2.2 Firing with an excessive charge of either sample or oxygen. 2.2.3 Ignition of any internal part of the vessel, including fuel capsule. 2.2.4 The evidence of corrosion or surface defects which exceed 80 % of the manufacturer’s stated corrosion allowance for the vessel. 2.2.5 Any change in thread tolerances of vessel enclosures which exceed the manufacturer’s specifications.
3. Hydrostatic Test
3.1 Fill the vessel with water at room temperature and connect to a suitable hydraulic pressure system. Be sure that all air has been displaced from the vessel and from the connecting gas passages. Support the vessel so that the diameter at the midsection of the cylinder can be measured with a micrometer caliper, and the deflection at the center point of the bottom can be measured with a micrometer dial indicator. Apply water pressure which is 1.5 times the manufacturer’s recommended working pressure test pressure of the vessel and check the vessel and pressure connections for leaks. 3.2 With the hydraulic system at atmospheric pressure, measure the diameter at the midsection of the cylinder and obtain a zero reading for the dial indicator in contact with the center point of the bottom of the vessel. Raise the hydrostatic pressure to test pressure and repeat these measurements, then release the pressure and take a third set of measurements with the system at atmospheric pressure. If the application of test pressure produces a deflection greater than 0.005 in. (0.127 mm) at the midsection of the cylinder or at the center point of the bottom of the vessel, or if any of the vessel parts do not resume their original dimensions when pressure is released, reject the vessel as unsafe.