在線觀看(kan)激情無碼(ma)成人AV:常壓人孔(kong)

人(ren)孔(kong)(kong)(kong)是指(zhi)用于(yu)人(ren)員進出(chu)設備以(yi)便安(an)(an)裝、檢修和(he)(he)安(an)(an)全(quan)檢查(cha)的開孔(kong)(kong)(kong)結(jie)構(gou)。主(zhu)要由短(duan)筒節（或(huo)短(duan)管）、法蘭和(he)(he)帶把手的人(ren)孔(kong)(kong)(kong)蓋組成。從安(an)(an)全(quan)檢查(cha)考慮，壓(ya)(ya)力容(rong)器要求開設的人(ren)孔(kong)(kong)(kong)數及其小尺(chi)寸(cun)見“檢查(cha)孔(kong)(kong)(kong)”。人(ren)孔(kong)(kong)(kong)材料有碳鋼(gang)和(he)(he)不銹鋼(gang)。按受壓(ya)(ya)情況人(ren)孔(kong)(kong)(kong)分(fen)(fen)為常(chang)壓(ya)(ya)和(he)(he)受壓(ya)(ya)人(ren)孔(kong)(kong)(kong)；按形狀(zhuang)人(ren)孔(kong)(kong)(kong)分(fen)(fen)為圓形、橢圓形和(he)(he)矩(ju)形人(ren)孔(kong)(kong)(kong)，矩(ju)形人(ren)孔(kong)(kong)(kong)僅適用于(yu)常(chang)壓(ya)(ya)設備；按安(an)(an)裝位置人(ren)孔(kong)(kong)(kong)分(fen)(fen)為水平和(he)(he)垂(chui)直安(an)(an)裝人(ren)孔(kong)(kong)(kong)；人(ren)孔(kong)(kong)(kong)蓋固定方式有迥轉蓋和(he)(he)吊蓋；人(ren)孔(kong)(kong)(kong)開后速(su)度有普通式和(he)(he)快開式，人(ren)孔(kong)(kong)(kong)結(jie)構(gou)和(he)(he)尺(chi)寸(cun)一般都已標準化，可(ke)參照有關手冊(ce)選用或(huo)設計。