午夜成人亞洲理倫片在線觀看(kan):常壓人孔

人(ren)(ren)(ren)(ren)孔是指用于人(ren)(ren)(ren)(ren)員進出設備以便安裝(zhuang)、檢修和(he)安全檢查的開孔結構。主(zhu)要由短筒(tong)節（或短管(guan)）、法蘭(lan)和(he)帶把(ba)手(shou)的人(ren)(ren)(ren)(ren)孔蓋(gai)組成(cheng)。從安全檢查考(kao)慮(lv)，壓(ya)(ya)力容器要求開設的人(ren)(ren)(ren)(ren)孔數及其小(xiao)尺寸見“檢查孔”。人(ren)(ren)(ren)(ren)孔材(cai)料有(you)碳(tan)鋼和(he)不銹鋼。按受(shou)壓(ya)(ya)情況(kuang)人(ren)(ren)(ren)(ren)孔分為常壓(ya)(ya)和(he)受(shou)壓(ya)(ya)人(ren)(ren)(ren)(ren)孔；按形(xing)(xing)狀(zhuang)人(ren)(ren)(ren)(ren)孔分為圓形(xing)(xing)、橢(tuo)圓形(xing)(xing)和(he)矩形(xing)(xing)人(ren)(ren)(ren)(ren)孔，矩形(xing)(xing)人(ren)(ren)(ren)(ren)孔僅適用于常壓(ya)(ya)設備；按安裝(zhuang)位置人(ren)(ren)(ren)(ren)孔分為水(shui)平(ping)和(he)垂直(zhi)安裝(zhuang)人(ren)(ren)(ren)(ren)孔；人(ren)(ren)(ren)(ren)孔蓋(gai)固(gu)定方(fang)式有(you)迥(jiong)轉蓋(gai)和(he)吊蓋(gai)；人(ren)(ren)(ren)(ren)孔開后速度有(you)普通式和(he)快開式，人(ren)(ren)(ren)(ren)孔結構和(he)尺寸一般(ban)都已標準化，可參照有(you)關手(shou)冊(ce)選(xuan)用或設計。