国内外输气管道放空系统设计标准分析

Analysis on the design standards of venting system for gas pipeline worldwide

详细分析了国内外输气管道放空系统设计标准。国内外对放空管、火炬与站场和阀室的安全间距均参考API521根据辐射热计算确定,国内针对可能携带可燃性液体的火炬,还规定了最小防火间距;站场放空火炬的设计计算,国内外均参考API521提供的两种方法进行。相关建议:针对放空量的计算,修订国内现行标准,对放空时间、放空压力做出相应规定,统一放空系统设计理念,明确放空量的计算方法与控制措施;在满足国家和地方法律、法规的前提下,尽量采用放空立管,减少放空火炬;建议跟踪API/ANSI521-2007(ISO 23257:2008(IDT))和API/ANSI537-2008(ISO 24257:2008<IDT>),同步更新国内标准。

Domestic and foreign design standards for gas pipeline venting system are analyzed in detail. Domestic and foreign safety clearances from venting pipes and flares to stations and valve chambers all are determined by calculations of radiant heat with reference to the API 521. China specifies the requirements on minimum fire separation of flares possibly with flammable liquids. Domestic and foreign design calculations of station flare systems all are carried out by two methods provided in the API 521. Relevant suggestions are proposed that with respect to calculations of venting amount, existing domestic standards should be revised to provide corresponding venting time and pressure, design concepts of the venting system should be unified and calculation methods and control measures of the venting volume should also be defined. Under the premise of complying with national and local laws and regulations, venting risers and reduction of flare systems should be reduced in use of. It is necessary to follow up API/ANSI 521-2007 （ISO 23257：2008 （IDT）） and API/ANSI 537-2008 （ISO 24257：2008 （IDT）） to update domestic standards simultaneously. （1 Table, 11 References）