ASME螺旋上升的伤口

ASME spiral wound structure The spiral gasket consists of "v-shape"(or"w-shape")metal tape and nonmetal tape,which are overlapped each other and wound continuously. To fasten the metal tape,both its start point end point are tack welded. performance and features 1.Wide range of applicable working condition,high temperature and high pressure resistance. applicable to super low temperature and vacuum condition. chemical resistant gasket is available under various medium,through change of composition of gasket. 2.Strong strees compensation. stable and reliable sealing performance even under frequent pressure fluctuation condition. 3.Perfect sealing performance. 4.Normal requirment of flange surface finishing which contact with gasket. 5.Easy installation and low pre-tightening stress of gasket. kind of gasket 1.A. spiral wound gasket consists of four types:basic type,with inner ring,with outer ring,and with inner and outer rings. B.heat exchanger spiral wound gasket:basic type and with inner and outer rings 2.Normally material used: A.Steel tape :08F ocr13,ocr18Ni9Ti.1Cr18Ni9Ti(321).ocr17Ni12,M02(316),and 0Cr17Ni14M02(316L) B.(Cold roll)steel plate for inner and outer ring: Outer ring "mild steel ,ocr13 and OCr18Ni9 Inner ring:same as steel ,special order is available through negotiation. C.Normetal tape:flexible graphite,special made asbestos,teflon and non-asbestos paper. Scope of Application 1.Working temperarure:-196 700(Not higher than 600 in oxidic medium) 2.Working pressure:<=25MPa 3.Gasket coefficient:m=2.5 4 4.Min.pre-tightening specific pressure:y=68MPa 5.Max.machinable size: 2800