人(ren)孔(kong)(kong)(kong)(kong)(kong)是(shi)指用于人(ren)員進出(chu)設備以(yi)便安裝、檢修和(he)(he)(he)安全檢查(cha)的開(kai)(kai)(kai)孔(kong)(kong)(kong)(kong)(kong)結構。主要由(you)短(duan)筒節(jie)（或短(duan)管）、法蘭和(he)(he)(he)帶把手的人(ren)孔(kong)(kong)(kong)(kong)(kong)蓋組成。從安全檢查(cha)考(kao)慮(lv)，壓(ya)力容器要求開(kai)(kai)(kai)設的人(ren)孔(kong)(kong)(kong)(kong)(kong)數及其小尺(chi)寸見“檢查(cha)孔(kong)(kong)(kong)(kong)(kong)”。人(ren)孔(kong)(kong)(kong)(kong)(kong)材(cai)料有碳鋼(gang)和(he)(he)(he)不銹鋼(gang)。按(an)(an)受壓(ya)情況人(ren)孔(kong)(kong)(kong)(kong)(kong)分(fen)為常壓(ya)和(he)(he)(he)受壓(ya)人(ren)孔(kong)(kong)(kong)(kong)(kong)；按(an)(an)形(xing)狀人(ren)孔(kong)(kong)(kong)(kong)(kong)分(fen)為圓形(xing)、橢圓形(xing)和(he)(he)(he)矩(ju)形(xing)人(ren)孔(kong)(kong)(kong)(kong)(kong)，矩(ju)形(xing)人(ren)孔(kong)(kong)(kong)(kong)(kong)僅適(shi)用于常壓(ya)設備；按(an)(an)安裝位置人(ren)孔(kong)(kong)(kong)(kong)(kong)分(fen)為水(shui)平和(he)(he)(he)垂直安裝人(ren)孔(kong)(kong)(kong)(kong)(kong)；人(ren)孔(kong)(kong)(kong)(kong)(kong)蓋固定方式有迥轉蓋和(he)(he)(he)吊蓋；人(ren)孔(kong)(kong)(kong)(kong)(kong)開(kai)(kai)(kai)后(hou)速度有普通式和(he)(he)(he)快開(kai)(kai)(kai)式，人(ren)孔(kong)(kong)(kong)(kong)(kong)結構和(he)(he)(he)尺(chi)寸一般都已標(biao)準化(hua)，可參照(zhao)有關手冊(ce)選(xuan)用或設計。