I-ASTM A53okujwayelekile yi-American Society for Testing and Materials. Izinga lifaka izinhlobonhlobo zamasayizi nobukhulu bamapayipi futhi lisebenza ezinhlelweni zamapayipi ezisetshenziselwa ukuthutha amagesi, uketshezi nolunye uketshezi. Amapayipi ajwayelekile e-ASTM A53 ajwayele ukusetshenziswa ezindaweni zezimboni nemishini, kanye nasembonini yezokwakha ukuze kutholakale amanzi, ukufudumeza kanye nezinhlelo zokupholisa umoya.

Ngokuvumelana neI-ASTM A53okujwayelekile, amapayipi angahlukaniswa abe izinhlobo ezimbili: Uhlobo F nohlobo E. Uhlobo F luyipayipi elingenamthungo futhi uhlobo E luyipayipi elishiselwe kagesi. Zombili izinhlobo zamapayipi zidinga ukwelashwa okushisa ukuze kuqinisekiswe ukuthi izakhiwo zabo zemishini kanye nokwakheka kwamakhemikhali kuhlangabezana nezidingo ezijwayelekile. Ngaphezu kwalokho, izidingo ezingaphezulu zepayipi kufanele zihambisane nezinhlinzeko zezinga le-ASTM A530/A530M ukuze kuqinisekiswe ikhwalithi yokubukeka kwayo.

Izidingo zokwakheka kwamakhemikhali zamapayipi ajwayelekile e-ASTM A53 zimi kanje: okuqukethwe kwekhabhoni akudluli u-0.30%, okuqukethwe kwe-manganese akudluli u-1.20%, okuqukethwe kwe-phosphorus akudluli u-0.05%, okuqukethwe kwesibabule akudluli ku-0.045%, okuqukethwe kwe-chromium akudluli. 0.40%, futhi okuqukethwe kwe-nickel akudluli u-0.40 %, okuqukethwe kwethusi akudluli u-0.40%. Le mikhawulo yokwakheka kwamakhemikhali iqinisekisa amandla, ukuqina nokumelana nokugqwala kwepayipi.

Mayelana nezakhiwo zemishini, izinga le-ASTM A53 lidinga ukuthi amandla okuqina namandla okukhiqiza amapayipi angabi ngaphansi kuka-330MPa no-205MPa ngokulandelanayo. Ngaphezu kwalokho, izinga lokwelulwa kwepayipi nalo linezidingo ezithile zokuqinisekisa ukuthi alijwayele ukuphuka noma ukuguqulwa ngesikhathi sokusetshenziswa.

Ngokungeziwe ekwakhiweni kwamakhemikhali kanye nezakhiwo zemishini, izinga le-ASTM A53 liphinde linikeze imithetho enemininingwane ngosayizi nekhwalithi yokubukeka kwamapayipi. Osayizi bamapayipi basukela ku-1/8 intshi kuya ku-26 amayintshi, nezinketho ezihlukahlukene zokujiya udonga. Ikhwalithi yokubukeka yepayipi idinga indawo ebushelelezi ngaphandle kwe-oxidation esobala, imifantu kanye namaphutha ukuze kuqinisekiswe ukuthi ngeke kuvuze noma konakaliswe ngesikhathi sokufakwa nokusetshenziswa.

Ngokuvamile, izinga le-ASTM A53 liyindinganiso ebalulekile yamapayipi ensimbi ye-carbon. Ihlanganisa izidingo zokwakheka kwamakhemikhali, izakhiwo zemishini, ubukhulu kanye nekhwalithi yokubukeka kwamapayipi. Amapayipi akhiqizwa ngokwaleli zinga angaqinisekisa izinga elizinzile nokusebenza okuthembekile, futhi afaneleka ezinhlelweni zamapayipi emikhakheni ehlukahlukene yezimboni nezokwakha. Ukwakhiwa nokuqaliswa kwamazinga e-ASTM A53 kubaluleke kakhulu ekuqinisekiseni ukusebenza ngokuphephile kwamapayipi kanye nokukhuthaza ikhwalithi yokwakhiwa kwephrojekthi.