ASTM_E_144_-_14.pdf

Designation:E14414Standard Practice forSafe Use of Oxygen Combustion Vessels1This standard is issued under the fixed designation E144;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope*1.1 This practice covers methods for judging the soundnessof new and used oxygen combustion vessels,and describes theprecautions to be observed in oxygen combustion vesselmethods.1.2 This practice is applicable to all procedures in whichsamples are completely oxidized by combustion in a metalvessel containing oxygen under pressure.Where there isconflict with specific precautions in individualASTM methods,the latter shall take precedence.1.3 The values stated in inch-pound units are to be regardedas standard.The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.1.4 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Physical Requirements2.1 Initial TestThe manufacturer of oxygen combustionvessels for use inASTM test methods shall furnish a certificatewith each new vessel showing that it has satisfactorily passedthe hydrostatic and proof tests described in Sections 3 and 4.When requested,the manufacturer shall supply evidence thatthe vessel is designed and constructed in accordance withrecognized practices for pressure vessel equipment.2.2 Periodic InspectionAll seals and other parts that arerecommended by the manufacturer shall be replaced or re-newed after each 5000 firing or at a more frequent interval ifthe seals or other parts show evidence of deterioration.Thehydrostatic and proof tests described in Sections 3 and 4 shallbe 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 oroxygen.2.2.3 Ignition of any internal part of the vessel,includingfuel capsule.2.2.4 The evidence of corrosion or surface defects whichexceed 80%of the manufacturers stated corrosion allowancefor the vessel.2.2.5 Any change in thread tolerances of vessel enclosureswhich exceed the manufacturers specifications.3.Hydrostatic Test3.1 Fill the vessel with water at room temperature andconnect to a suitable hydraulic pressure system.Be sure that allair has been displaced from the vessel and from the connectinggas passages.Support the vessel so that the diameter at themidsection of the cylinder can be measured with a micrometercaliper,and the deflection at the center point of the bottom canbe measured with a micrometer dial indicator.Apply waterpressure which is 1.5 times the manufacturers recommendedworking pressure test pressure of the vessel and check thevessel and pressure connections for leaks.3.2 With the hydraulic system at atmospheric pressure,measure the diameter at the midsection of the cylinder andobtain a zero reading for the dial indicator in contact with thecenter point of the bottom of the vessel.Raise the hydrostaticpressure to test pressure and repeat these measurements,thenrelease the pressure and take a third set of measurements withthe system at atmospheric pressure.If the application of testpressure produces a deflection greater than 0.005 in.(0.127 mm)at the midsection of the cylinder or at the centerpoint of the bottom of the vessel,or if any of the vessel partsdo not resume their original dimensions when pressure isreleased,reject the vessel as unsafe.4.Proof Test4.1 Record the outside diameter at the midsection of thevessel cylinder as measured with a micrometer caliper,thenassemble the vessel for firing with a tablet or pellet ofcompressed benzoic acid that gives an energy release that is 1.5times the manufacturers recommended energy release limit.Admit oxygen slowly to an initial pressure that represents themanufacturers maximum charging pressure,then submergethe vessel in water and check for gas leaks.If none appear,arrange the vessel for firing in a water bath protected by aheavy barricade.(WarningThis is a proof test with an1This practice is under the jurisdiction of ASTM Committee E41 on LaboratoryApparatus and is the direct responsibility of Subcommittee E41.01 on Apparatus.Current edition approved Dec.1,2014.Published January 2015.Originallyapproved in 1959.Last previous edition approved in 2011 as E144 94(2011).DOI:10.1520/E0144-14.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 excess charge,therefore the operator must be fully protected(5.1.4)in case the vessel sho