公稱(cheng)直徑小(xiao)(xiao)于(yu)(yu)(yu)150mm，且其高工作壓(ya)力小(xiao)(xiao)于(yu)(yu)(yu)1.6MPa（表壓(ya)）的(de)輸送***、不可燃、無腐(fu)蝕(shi)性(xing)(xing)氣體的(de)管(guan)道和設備本(ben)體所屬管(guan)道除外(wai)。如果兩磁極間距太小(xiao)(xiao)，由于(yu)(yu)(yu)磁極附(fu)近磁通密度(du)過(guo)大(da)會產生非相關顯示，磁極間距太大(da)會造(zao)成磁場(chang)強度(du)不夠。GC1：輸送《危(wei)險化(hua)學品目錄》中規定的(de)毒(du)性(xing)(xing)程度(du)為急(ji)性(xing)(xing)毒(du)性(xing)(xing)類(lei)別1介質、急(ji)性(xing)(xing)毒(du)性(xing)(xing)類(lei)別2氣體介質和工作溫度(du)高于(yu)(yu)(yu)其標準沸點的(de)急(ji)性(xing)(xing)毒(du)性(xing)(xing)類(lei)別2液體介質的(de)工藝管(guan)道。

從中國頒(ban)發《壓力管(guan)(guan)(guan)道(dao)(dao)安全管(guan)(guan)(guan)理(li)與(yu)監(jian)察(cha)規(gui)定》以后，“壓力管(guan)(guan)(guan)道(dao)(dao)”便(bian)成(cheng)為受(shou)監(jian)察(cha)管(guan)(guan)(guan)道(dao)(dao)的名(ming)詞(ci)。壓力管(guan)(guan)(guan)道(dao)(dao)是(shi)管(guan)(guan)(guan)道(dao)(dao)中的一部分，申請壓力管(guan)(guan)(guan)道(dao)(dao)資質，管(guan)(guan)(guan)道(dao)(dao)是(shi)用(yong)以輸送、分配(pei)、混合、分離、排放(fang)、計量、控制(zhi)和制(zhi)止流(liu)體流(liu)動的。從廣義上理(li)解，壓力管(guan)(guan)(guan)道(dao)(dao)是(shi)指所有(you)承受(shou)內壓或外(wai)壓的管(guan)(guan)(guan)道(dao)(dao)，宣城壓力管(guan)(guan)(guan)道(dao)(dao)資質，無(wu)論其管(guan)(guan)(guan)內介質如何(he)。由管(guan)(guan)(guan)子、管(guan)(guan)(guan)件(jian)、法蘭、螺(luo)栓連接、墊(dian)片(pian)、閥(fa)門、其他組成(cheng)件(jian)或受(shou)壓部件(jian)和支(zhi)承件(jian)組成(cheng)的裝配(pei)總成(cheng)。

頒布的《特種(zhong)設備安全監察條例》明確規(gui)定：壓(ya)力管道和鍋爐、壓(ya)力容(rong)器(qi)、起重(zhong)機械(xie)并列(lie)為不安全因素較多(duo)的特種(zhong)設備。管道組成(cheng)件(jian)和管道支承(cheng)件(jian)的種(zhong)類繁(fan)多(duo)，壓(ya)力管道資(zi)質(zhi)辦(ban)理，各種(zhong)材料(liao)各有特點和具體技術要求，材料(liao)選用(yong)復雜。管道上(shang)的可能泄漏(lou)點多(duo)于壓(ya)力容(rong)器(qi)，僅一(yi)個閥門(men)通常就有五處。對(dui)于鍋爐、壓(ya)力容(rong)器(qi)和壓(ya)力管道，常用(yong)的磁(ci)(ci)(ci)化方法(fa)是(shi)(shi)：磁(ci)(ci)(ci)扼(e)(e)法(fa)和觸頭法(fa)。磁(ci)(ci)(ci)扼(e)(e)法(fa)是(shi)(shi)使用(yong)便(bian)攜式電(dian)磁(ci)(ci)(ci)扼(e)(e)兩磁(ci)(ci)(ci)極接觸工件(jian)表(biao)面進行局部(bu)磁(ci)(ci)(ci)化，用(yong)于發現與兩磁(ci)(ci)(ci)極連線垂直(zhi)的缺陷(xian)。