精品(pin)久久綜(zong)合1區2區3區激情:常壓人孔(kong)

人(ren)(ren)孔(kong)(kong)(kong)(kong)是指用于人(ren)(ren)員進出設(she)備(bei)以便安(an)(an)裝(zhuang)、檢(jian)修和(he)(he)安(an)(an)全檢(jian)查的(de)開孔(kong)(kong)(kong)(kong)結構。主要由短筒節（或(huo)短管）、法蘭和(he)(he)帶把(ba)手(shou)的(de)人(ren)(ren)孔(kong)(kong)(kong)(kong)蓋(gai)(gai)組成。從(cong)安(an)(an)全檢(jian)查考慮，壓(ya)(ya)(ya)力容(rong)器要求開設(she)的(de)人(ren)(ren)孔(kong)(kong)(kong)(kong)數及其(qi)小尺寸見“檢(jian)查孔(kong)(kong)(kong)(kong)”。人(ren)(ren)孔(kong)(kong)(kong)(kong)材料(liao)有碳鋼和(he)(he)不銹鋼。按受(shou)壓(ya)(ya)(ya)情(qing)況人(ren)(ren)孔(kong)(kong)(kong)(kong)分為常(chang)(chang)壓(ya)(ya)(ya)和(he)(he)受(shou)壓(ya)(ya)(ya)人(ren)(ren)孔(kong)(kong)(kong)(kong)；按形狀人(ren)(ren)孔(kong)(kong)(kong)(kong)分為圓形、橢圓形和(he)(he)矩(ju)形人(ren)(ren)孔(kong)(kong)(kong)(kong)，矩(ju)形人(ren)(ren)孔(kong)(kong)(kong)(kong)僅適用于常(chang)(chang)壓(ya)(ya)(ya)設(she)備(bei)；按安(an)(an)裝(zhuang)位置人(ren)(ren)孔(kong)(kong)(kong)(kong)分為水平和(he)(he)垂(chui)直(zhi)安(an)(an)裝(zhuang)人(ren)(ren)孔(kong)(kong)(kong)(kong)；人(ren)(ren)孔(kong)(kong)(kong)(kong)蓋(gai)(gai)固(gu)定方式(shi)(shi)有迥轉蓋(gai)(gai)和(he)(he)吊蓋(gai)(gai)；人(ren)(ren)孔(kong)(kong)(kong)(kong)開后速度有普通(tong)式(shi)(shi)和(he)(he)快開式(shi)(shi)，人(ren)(ren)孔(kong)(kong)(kong)(kong)結構和(he)(he)尺寸一般都已標準(zhun)化(hua)，可(ke)參照有關(guan)手(shou)冊選用或(huo)設(she)計。