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Trong cấu trúc này, những căng thẳng lớn nhất là trên các cạnh bên trong của các lỗ hổng, đặc biệt là các điểm nằm trên các trục kết nối hai lỗ liền kề và các trục đối xứng. Các điểm thú vị nhất (Hình 7,26) Các thông số quan trọng một số tạp chí trong vòng bi, (L / D) và (e / C). | RECIPROCATING COMPRESSOR SEALING 17.21 FIGURE 17.15 Static seal arrangement in a packing case. regulatory limit for compressor leakage. It is indirectly established by the limit on the allowable concentrationofVOC volatile oi-ganiccompouiids measured near the leak soeccc. Fedeaat loeitilaibois consider 500 ppm parts per million to be no detectable emissions. USierooabceiocsreomruthatmiy nompreasornnt incompliorcewith that emtssõpnicpel nnKt OabcabanOerflosd ers Cd liquid systemintCallcdyniCc seal. A berrier system is one in which a non-VOC liquid or gas is forced to flow into the sei ilia oSocctdai Ofpasite t e that of ihcicakage. Thebacrierfluid OTgus blocks tCe etcape cfteakaoetoetmosphesefrom tik com it isoi- seal ee peokibou The sysiemcanOeieltailca monaof twowayc 1. A fluid usually inert is injected to form a barrier seal between the process gas and atmosphere.The dutdpreasuremusrbamoiwteinodsliehtle ahooc rfe yree-sure upetrUam ofthe teal. aboe byaroein ia rte aeili usuíúly WAT OTAArings as noueoa in lay. 17.1elTheCamasgos islk ldat a paessnaeecdeeding thoprostaae in the oent wCidicarriesleakageawoyWaom the compoosspb seal. On aecipaocating equipment the motion of the aod will caaay fluid usually oil in the foamcf altoo fèhntmOratyfteal ffee nndoutto ftaK f phet e elkd emission of gas ccrriedin tì ct oil may Oe ceieosft. The oit OCu ibi rOernO ttfTaeefb TaOi gas whiia inthecyimdcrfueto fee aetaoivelyhigef aspaessnaC and Hiu ti deess s this gasip etmiisplkta wlttc the bod iiU too cut ofthepaeOmylOnnonCubfap 17.22 CHAPTER SEVENTEEN plications gas molecules can be carried out of the packing in the rod surface irregularities. In eitliercia e. asmall quantity of gas may escape the barrier seal and become fugitive emisaions outside tle taclcog flange.Thesemaymaasiưeasmuchas200 ppm bmtgenarany tio muchlower. Gas iiihispoated bytae rod earfiuie accemss importimrenlywhai allowabae emissiunsapproachicrUi 77.27 WIPER PACKING In addition to wiping oil from the rod .