ASTM_G_128_-_G_128M_-_15.pdf

Designation:G128/G128M15Standard Guide forControl of Hazards and Risks in Oxygen Enriched Systems1This standard is issued under the fixed designation G128/G128M;the number immediately following the designation indicates the yearof 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.1.Scope1.1 This guide covers an overview of the work of ASTMCommittee G04 on Compatibility and Sensitivity of Materialsin Oxygen-Enriched Atmospheres.It is a starting point forthose asking the question:“What are the risks associated withmy use of oxygen?”This guide is an introduction to the uniqueconcerns that must be addressed in the handling of oxygen.Theprincipal hazard is the prospect of ignition with resultant fire,explosion,or both.All fluid systems require designconsiderations,such as adequate strength,corrosion resistance,fatigue resistance,and pressure safety relief.In addition tothese design considerations,one must also consider the ignitionmechanisms that are specific to an oxygen-enriched system.This guide outlines these ignition mechanisms and the ap-proach to reducing the risks.1.2 This guide also lists several of the recognized causes ofoxygen system fires and describes the methods available toprevent them.Sources of information about the oxygen hazardand its control are listed and summarized.The principal focusis on Guides G63,G88,Practice G93,and Guide G94.Usefuldocumentation from other resources and literature is also cited.NOTE1This guide is an outgrowth of an earlier(1988)CommitteeG04 videotape adjunct entitled Oxygen Safety and a related paper byKoch2that focused on the recognized ignition source of adiabaticcompression as one of the more significant but often overlooked causes ofoxygen fires.This guide recapitulates and updates material in thevideotape and paper.1.3 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard.The values stated ineach system may not be exact equivalents;therefore,eachsystem shall be used independently of the other.Combiningvalues from the two systems may result in non-conformancewith the 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.For specificprecautionary statements see Sections 8 and 11.NOTE2ASTM takes no position respecting the validity of anyevaluation methods asserted in connection with any item mentioned in thisguide.Users of this guide are expressly advised that determination of thevalidity of any such evaluation methods and data and the risk of use ofsuch evaluation methods and data are entirely their own responsibility.2.Referenced Documents2.1 ASTM Standards:3D2512 Test Method for Compatibility of Materials withLiquid Oxygen(Impact Sensitivity Threshold and Pass-Fail Techniques)D2863 Test Method for Measuring the Minimum OxygenConcentration to Support Candle-Like Combustion ofPlastics(Oxygen Index)D4809 Test Method for Heat of Combustion of LiquidHydrocarbon Fuels by Bomb Calorimeter(PrecisionMethod)G63 Guide for Evaluating Nonmetallic Materials for Oxy-gen ServiceG72 Test Method for Autogenous Ignition Temperature ofLiquids and Solids in a High-Pressure Oxygen-EnrichedEnvironmentG74 Test Method for Ignition Sensitivity of NonmetallicMaterials and Components by Gaseous Fluid ImpactG86 Test Method for Determining Ignition Sensitivity ofMaterials to Mechanical Impact in Ambient Liquid Oxy-gen and Pressurized Liquid and Gaseous Oxygen Envi-ronmentsG88 Guide for Designing Systems for Oxygen ServiceG93 Practice for Cleaning Methods and Cleanliness Levelsfor Material and Equipment Used in Oxygen-EnrichedEnvironmentsG94 Guide for Evaluating Metals for Oxygen ServiceG124 Test Method for Determining the Combustion Behav-ior of Metallic Materials in Oxygen-Enriched Atmo-spheres1This guide is under the jurisdiction ofASTM Committee G04 on Compatibilityand Sensitivity of Materials in Oxygen Enriched Atmospheres and is the directresponsibility of Subcommittee G04.02 on Recommended Practices.Current edition approved Oct.1,2015.Published November 2015.Originallyapproved in 1995.Last previous edition approved in 2008 as G128 02(2008).DOI:10.1520/G0128_G0128M-15.2Koch,U.H.,“Oxygen System Safety,”Flammability and Sensitivity ofMaterials In Oxygen-Enriched Atmospheres,Vol 6,ASTM STP1197,ASTM,1993,pp.349359.3For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United S