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1、1.1INSTRUMENTSINSTALLATIONSTANDARD儀表安裝標(biāo)準(zhǔn)Allinstrumentsshallbeclosecoupledwherepossibleormountedasclosetotheprocessconnectionaspossibletominimizethelengthoftheimpulselinewithoutcompromisingtheaccessibilityoftheinstrument.Thelocationofinstrumentsshallbesothatdirectdrainageofcondensate,
2、waterorprocessfluidsfromadjacentequipmenthasnoadverseeffect.所有儀表的連接要盡可能的緊密,盡量靠近工藝接頭,減少?zèng)_擊管的長(zhǎng)度,但不影響出入儀表維護(hù)通道。儀表位置應(yīng)可直接將相鄰設(shè)備的冷凝、水或工藝流體排泄,從而不會(huì)產(chǎn)生不利影響。Allfieldinstruments,processtapsandassociatedcontrolequipmentshallbereadilyaccessibleforrepairoradjustmentfromgrade,fixedplatformorfixedwalkwa
3、y.Arollingplatformmaybeusedwherefreeaccessisavailabletothespacebelowtheinstrument.Afixedladdermaybeusedfortransmitters,gaugesetc.butisnotsuitableforin-lineinstrumentssuchasvalvesandflowmeters.Localindicatinginstrumentsshallbelocatedsuchthatscalesarereadablebothfromtheaccesspointandfr
4、omwhererelatedequipmentisoperatedorwhereprimaryinstrumentsaretestedorcalibrated.Instrumentsshallnotbelocatedinamannerwhichinterfereswithaladder,platform,walkwayoroperatingarea.所有現(xiàn)場(chǎng)儀表、工藝取壓接頭和有關(guān)控制設(shè)備,應(yīng)可以在地面、固定平臺(tái)或固定人行通道隨時(shí)靠近維修或調(diào)節(jié)。如果儀表下方有空間的話,可以使用一個(gè)可移動(dòng)平臺(tái)對(duì)儀表進(jìn)行維修??梢杂霉潭ǖ奶葑觼?lái)維修變送器和壓力表等,但不能用于在線儀
5、表,例如閥門(mén)和流量計(jì)?,F(xiàn)場(chǎng)儀表的位置應(yīng)便于讀取儀表刻度,從檢修通道、設(shè)備操作位置、或試驗(yàn)或校對(duì)一次儀表的地方都可以讀取。儀表的布置位置不應(yīng)碰到梯子、平臺(tái)、通道或操作區(qū)域。Pressureanddifferentialpressureinstrumentsshallbelocatedabovethetapsforgas,boilingliquidsandnoncondensablevaporsandbelowthetapsfornon-boilingliquidsandcondensablevapors.Installationbelowtapsisallowed
6、forpressureanddifferentialpressureinstrumentsindrygasandnoncondensablevaporswheretherearedifficultieswithabovetapinstallation,subjecttoapprovalbySECCO.Installationbelowtapsforwetgasesmaybeconsideredprovidingthatsuitablecatchpotsanddrainvalvesareincludedandthatthequantityofliquidcolle
7、ctedismanageablebynormalmaintenance,againsubjecttoSECCOapproval.壓力儀表和差壓儀表的位置應(yīng)高于氣體、汽化液體和非冷凝蒸氣的接口,但低于非冷凝液體和冷凝蒸氣接口。對(duì)于低于干性氣體和非冷凝蒸氣接口的壓力和差壓儀表安裝(因高于接口安裝比較困難),應(yīng)提交賽科批準(zhǔn)。對(duì)于低于濕氣接口的安裝應(yīng)考慮使用合適的油氣分離罐和排液閥,而且,收集液體的數(shù)量可通過(guò)正常維護(hù)得到控制,這同樣需要賽科的批準(zhǔn)。Instrumentsshallbemountedandroutedtoavoidanyhightemperatureand
8、electromagne