人(ren)孔(kong)(kong)(kong)是指用于人(ren)員進(jìn)出設(shè)備以便安(an)(an)裝、檢(jian)修(xiu)和(he)(he)安(an)(an)全(quan)檢(jian)查的開孔(kong)(kong)(kong)結(jié)(jie)構(gòu)(gou)。主要由短筒(tong)節(jié)（或短管）、法蘭(lan)和(he)(he)帶把手的人(ren)孔(kong)(kong)(kong)蓋組成。從安(an)(an)全(quan)檢(jian)查考慮，壓力容器要求開設(shè)的人(ren)孔(kong)(kong)(kong)數(shù)及其小尺寸(cun)見(jian)“檢(jian)查孔(kong)(kong)(kong)”。人(ren)孔(kong)(kong)(kong)材料有碳鋼和(he)(he)不銹鋼。按受壓情況人(ren)孔(kong)(kong)(kong)分(fen)(fen)為常壓和(he)(he)受壓人(ren)孔(kong)(kong)(kong)；按形(xing)狀(zhuang)人(ren)孔(kong)(kong)(kong)分(fen)(fen)為圓形(xing)、橢圓形(xing)和(he)(he)矩(ju)形(xing)人(ren)孔(kong)(kong)(kong)，矩(ju)形(xing)人(ren)孔(kong)(kong)(kong)僅適用于常壓設(shè)備；按安(an)(an)裝位置人(ren)孔(kong)(kong)(kong)分(fen)(fen)為水平和(he)(he)垂直(zhi)安(an)(an)裝人(ren)孔(kong)(kong)(kong)；人(ren)孔(kong)(kong)(kong)蓋固定(ding)方式有迥轉(zhuǎn)(zhuan)蓋和(he)(he)吊蓋；人(ren)孔(kong)(kong)(kong)開后速度有普通式和(he)(he)快(kuai)開式，人(ren)孔(kong)(kong)(kong)結(jié)(jie)構(gòu)(gou)和(he)(he)尺寸(cun)一(yi)般都已(yi)標(biāo)(biao)準(zhǔn)化，可參照有關(guān)(guan)手冊(cè)選用或設(shè)計(jì)。