人(ren)(ren)(ren)(ren)(ren)(ren)孔(kong)(kong)(kong)(kong)(kong)(kong)(kong)(kong)(kong)(kong)(kong)是指用(yong)于(yu)人(ren)(ren)(ren)(ren)(ren)(ren)員進(jin)出(chu)設(she)(she)備(bei)以便(bian)安裝、檢(jian)修和(he)安全檢(jian)查的(de)開(kai)(kai)孔(kong)(kong)(kong)(kong)(kong)(kong)(kong)(kong)(kong)(kong)(kong)結(jie)構(gou)。主要(yao)由(you)短(duan)筒節（或短(duan)管）、法蘭(lan)和(he)帶把手(shou)的(de)人(ren)(ren)(ren)(ren)(ren)(ren)孔(kong)(kong)(kong)(kong)(kong)(kong)(kong)(kong)(kong)(kong)(kong)蓋(gai)組成。從(cong)安全檢(jian)查考慮，壓(ya)力容器要(yao)求開(kai)(kai)設(she)(she)的(de)人(ren)(ren)(ren)(ren)(ren)(ren)孔(kong)(kong)(kong)(kong)(kong)(kong)(kong)(kong)(kong)(kong)(kong)數及(ji)其(qi)小尺(chi)寸見“檢(jian)查孔(kong)(kong)(kong)(kong)(kong)(kong)(kong)(kong)(kong)(kong)(kong)”。人(ren)(ren)(ren)(ren)(ren)(ren)孔(kong)(kong)(kong)(kong)(kong)(kong)(kong)(kong)(kong)(kong)(kong)材料(liao)有(you)(you)碳鋼和(he)不銹鋼。按(an)受(shou)壓(ya)情況人(ren)(ren)(ren)(ren)(ren)(ren)孔(kong)(kong)(kong)(kong)(kong)(kong)(kong)(kong)(kong)(kong)(kong)分為常壓(ya)和(he)受(shou)壓(ya)人(ren)(ren)(ren)(ren)(ren)(ren)孔(kong)(kong)(kong)(kong)(kong)(kong)(kong)(kong)(kong)(kong)(kong)；按(an)形(xing)狀人(ren)(ren)(ren)(ren)(ren)(ren)孔(kong)(kong)(kong)(kong)(kong)(kong)(kong)(kong)(kong)(kong)(kong)分為圓形(xing)、橢圓形(xing)和(he)矩形(xing)人(ren)(ren)(ren)(ren)(ren)(ren)孔(kong)(kong)(kong)(kong)(kong)(kong)(kong)(kong)(kong)(kong)(kong)，矩形(xing)人(ren)(ren)(ren)(ren)(ren)(ren)孔(kong)(kong)(kong)(kong)(kong)(kong)(kong)(kong)(kong)(kong)(kong)僅(jin)適用(yong)于(yu)常壓(ya)設(she)(she)備(bei)；按(an)安裝位置人(ren)(ren)(ren)(ren)(ren)(ren)孔(kong)(kong)(kong)(kong)(kong)(kong)(kong)(kong)(kong)(kong)(kong)分為水平和(he)垂(chui)直(zhi)安裝人(ren)(ren)(ren)(ren)(ren)(ren)孔(kong)(kong)(kong)(kong)(kong)(kong)(kong)(kong)(kong)(kong)(kong)；人(ren)(ren)(ren)(ren)(ren)(ren)孔(kong)(kong)(kong)(kong)(kong)(kong)(kong)(kong)(kong)(kong)(kong)蓋(gai)固定方式(shi)有(you)(you)迥(jiong)轉(zhuan)蓋(gai)和(he)吊蓋(gai)；人(ren)(ren)(ren)(ren)(ren)(ren)孔(kong)(kong)(kong)(kong)(kong)(kong)(kong)(kong)(kong)(kong)(kong)開(kai)(kai)后速(su)度有(you)(you)普通式(shi)和(he)快開(kai)(kai)式(shi)，人(ren)(ren)(ren)(ren)(ren)(ren)孔(kong)(kong)(kong)(kong)(kong)(kong)(kong)(kong)(kong)(kong)(kong)結(jie)構(gou)和(he)尺(chi)寸一般都已標準化，可參(can)照有(you)(you)關手(shou)冊(ce)選用(yong)或設(she)(she)計。