ASTM_E_1752_-_95_2000e1.pdf

Designation:E 1752 95(Reapproved 2000)e1Standard Guide forCollection of Multi-Media Field Emission and DischargeData Associated with Glycol Dehydration Units1This standard is issued under the fixed designation E 1752;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(e)indicates an editorial change since the last revision or reapproval.e1NOTESubsections 6.3.4 and 7.2.5 were corrected editorially in November 2000.1.Scope1.1 PurposeThis guide covers the proper collection offield emission and discharge data associated with glycoldehydration units used in the natural gas production,process-ing,transmission,storage,and distribution industries.1.2 Background:1.2.1 Increasing regulatory pressure has made emissions ofbenzene,toluene,ethylbenzene,and xylene isomers(collec-tively known as BTEX)and volatile organic compounds(VOCs)from the still vent of glycol dehydration units a majorconcern of the natural gas industry.The Clean Air ActAmendments(CAAA)of 1990 have been the impetus for airtoxics regulations,and several states are regulating or areconsidering regulating emissions from glycol units(1).2Liquidand solid waste discharges are exempt from Subtitle C(haz-ardous waste)regulation under the Resource Conservation andRecovery Act(RCRA),but may be regulated in the future(2).1.2.2 Measurement of the waste streams from dehydrators isimportant to determine which units may have emissions abovelevels of regulatory concern.Measurements of air emissionsfrom glycol dehydration units have been made from a varietyof sampling points using different sampling protocols andanalytical techniques since no standard methods have beendeveloped by the United States Environmental ProtectionAgency(USEPA)or state regulatory agencies.Standard sam-pling methods do not exist for the liquid and solid wastestreams since they are exempt from RCRASubtitle C.The lackof standard protocols has meant that variations of this approachcan result in very different emissions measurements(3).1.2.3 Providing guidance on the collection of field emissionand discharge data will allow the natural gas industry toquantify emissions and apply appropriate controls to complywith regulations.1.3 SummaryThis guide has several parts and an annex.Section 1 is Scope.Section 2 is Terminology that has defini-tions of terms commonly used with relation to glycol dehydra-tion units in the natural gas industry.Section 3 is Significanceand Use of this guide.Section 4 is a process description ofglycol dehydration units.Section 5 is a discussion of the wastestreams associated with glycol dehydrators.Section 6 presentsthe Approaches for Collecting Air Emission Data,whileSections 7 and 8 present the approaches for collecting liquidand solid waste discharge data,respectively.The annex in-cludes a standard operating procedure(SOP)for the rich/leanglycol sampling method discussed in this guide.1.4 The values stated in either inch-pound or SI units are tobe regarded separately as the standard.The values given inparentheses are for information only.1.5 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.Terminology2.1 Definitions of Terms Specific to This Standard:2.1.1 BTEXthe compounds benzene,toluene,ethylben-zene,and xylene isomers.2.1.2 Clean Air Act Amendments(CAAA)the 1990 federalamendments to the Clean Air Act.These amendments addressnonattainment areas,hazardous air pollutants,permitting,andenforcement.2.1.3 condensatewater or light hydrocarbons that havechanged from a vapor to a condensed liquid state.2.1.4 contactor(or absorber)a vertical pressure vesselwhere gas and glycol are intermingled countercurrently toremove water vapor from the gas.2.1.5 dehdyrationremoval of water vapor from naturalgas.Maximum water content of the dehydrated gas is normally7 lbs(3175 g)H2O/MMSCF.2.1.6 flash tanka two-or three-phase separator that is usedin the rich glycol stream to remove entrained gas and hydro-carbon liquid.2.1.7 gas absorptionan operation in which a gas mixtureis contacted with a liquid for the purposes of preferentiallydissolving one or more components of the gas and to provide1This guide is under the jurisdiction ofASTM Committee E50 on EnvironmentalAssessment and is the direct responsibility of Subcommittee E50.05 on WetlandEcosystems.Current edition approved Oct.10,1995.Published December 1995.2The boldface numbers in parentheses refer to the list of references at the end ofthe text.1Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959,United States.a solution of these in the liquid.2.1.8 gas/glycol heat exchangera shell-and-tube,pipe-in-pi