人(ren)(ren)(ren)(ren)(ren)(ren)孔(kong)(kong)是指(zhi)用(yong)于(yu)人(ren)(ren)(ren)(ren)(ren)(ren)員進出設(she)備以便安(an)裝、檢(jian)修(xiu)和(he)(he)安(an)全檢(jian)查的開(kai)(kai)孔(kong)(kong)結(jie)構。主要由短筒(tong)節（或(huo)短管）、法蘭和(he)(he)帶把手的人(ren)(ren)(ren)(ren)(ren)(ren)孔(kong)(kong)蓋(gai)(gai)(gai)(gai)組成。從安(an)全檢(jian)查考(kao)慮，壓(ya)力容器要求開(kai)(kai)設(she)的人(ren)(ren)(ren)(ren)(ren)(ren)孔(kong)(kong)數及其小尺寸見“檢(jian)查孔(kong)(kong)”。人(ren)(ren)(ren)(ren)(ren)(ren)孔(kong)(kong)材(cai)料(liao)有(you)碳鋼和(he)(he)不銹鋼。按受壓(ya)情況(kuang)人(ren)(ren)(ren)(ren)(ren)(ren)孔(kong)(kong)分為(wei)常壓(ya)和(he)(he)受壓(ya)人(ren)(ren)(ren)(ren)(ren)(ren)孔(kong)(kong)；按形(xing)狀(zhuang)人(ren)(ren)(ren)(ren)(ren)(ren)孔(kong)(kong)分為(wei)圓形(xing)、橢圓形(xing)和(he)(he)矩(ju)形(xing)人(ren)(ren)(ren)(ren)(ren)(ren)孔(kong)(kong)，矩(ju)形(xing)人(ren)(ren)(ren)(ren)(ren)(ren)孔(kong)(kong)僅(jin)適用(yong)于(yu)常壓(ya)設(she)備；按安(an)裝位置人(ren)(ren)(ren)(ren)(ren)(ren)孔(kong)(kong)分為(wei)水平和(he)(he)垂直(zhi)安(an)裝人(ren)(ren)(ren)(ren)(ren)(ren)孔(kong)(kong)；人(ren)(ren)(ren)(ren)(ren)(ren)孔(kong)(kong)蓋(gai)(gai)(gai)(gai)固定方式有(you)迥轉蓋(gai)(gai)(gai)(gai)和(he)(he)吊蓋(gai)(gai)(gai)(gai)；人(ren)(ren)(ren)(ren)(ren)(ren)孔(kong)(kong)開(kai)(kai)后速(su)度(du)有(you)普通(tong)式和(he)(he)快開(kai)(kai)式，人(ren)(ren)(ren)(ren)(ren)(ren)孔(kong)(kong)結(jie)構和(he)(he)尺寸一般都已標準化，可參照有(you)關手冊選(xuan)用(yong)或(huo)設(she)計。