ʻO ka API 5L ka mea maʻamau i ka hoʻokō maʻamau o nā paipu laina, ʻo ia nā pipeline i hoʻohana ʻia no ka lawe ʻana i ka aila, ka mahu, ka wai, a me nā mea ʻē aʻe i lawe ʻia mai ka ʻāina i ka ʻaila a me nā ʻoihana ʻenehana kūlohelohe.Aia nā paipu laina i nā paipu kila ʻole a me nā paipu kila welded.I kēia manawa, ʻo nā ʻano paipu kila i hoʻohana mau ʻia i loko o nā paipu aila ma Kina, ʻo ia ka spiral submerged arc welded pipe (SSAW), longitudinal submerged arc welded pipe (LSAW), a me ka uila welded welded pipe (ERW).Koho maʻamau ʻia nā paipu kila seam i ka emi ʻana o ke anawaena paipu ma mua o 152mm.

Nui nā māka o nā mea maka no nā paipu kila API 5L: GR.B, X42, X46, X52, X56, X60, X70, X80, a pēlā aku.Loaʻa i nā ʻano kila like ʻole o nā paipu kila nā koi kiʻekiʻe no nā mea maka a me ka hana ʻana, a ʻo ka carbon equivalent ma waena o nā ʻano kila like ʻole e mālama pono ʻia.

E like me ka ʻike ʻana o nā mea āpau e pili ana i ka API 5L, ʻelua mau kūlana, PSL1 a me PSL2.ʻOiai hoʻokahi wale nō ʻokoʻa huaʻōlelo, ʻokoʻa loa ka ʻike o kēia mau pae ʻelua.Ua like kēia me ke kūlana GB / T9711.1.2.3.Kūkākūkā like lākou a pau, akā ʻokoʻa loa nā koi.I kēia manawa e kamaʻilio wau e pili ana i ka ʻokoʻa ma waena o PSL1 a me PSL2 i ka kikoʻī:

1. ʻO PSL ka pōkole no ka pae kikoʻī huahana.Hoʻokaʻawale ʻia ka pae kikoʻī o ka paipu laina i PSL1 a me PSL2, hiki ke ʻōlelo ʻia ua māhele ʻia ka pae maikaʻi i PSL1 a me PSL2.ʻOi aku ka PSL2 ma mua o PSL1.ʻAʻole ʻokoʻa kēia mau pae kikoʻī ʻelua i nā koi no ka nānā ʻana, akā i ka hoʻohui kemika a me nā waiwai mechanical.No laila, i ka wā e kauoha ai e like me API 5L, ʻaʻole e hōʻike wale nā ​​huaʻōlelo i ka ʻaelike i nā hōʻailona maʻamau e like me nā kikoʻī a me nā pae kila., Pono e hōʻike i ka pae kikoʻī o ka huahana, ʻo ia hoʻi, PSL1 a i ʻole PSL2.ʻOi aku ka koʻikoʻi o PSL2 ma mua o PSL1 i nā hōʻailona e like me ka haku mele, nā waiwai tensile, ka ikehu hopena, a me ka hoʻāʻo ʻole luku.

2, PSL1 'a'ole koi i ka hopena o ka hana, PSL2 nā kila kila a pau koe x80, piha 0 ℃ Akv awelika waiwai: longitudinal ≥ 41J, transverse ≥ 27J.X80 kila kila, piha-kaulike 0 ℃ Akv awelika waiwai: longitudinal ≥ 101J, transverse ≥ 68J.

3. Pono e ho'āʻoʻia nā paipu laina i ka ho'āʻoʻana o ka wai i kēlā me kēia, aʻaʻole i'ōlelo ka maʻamau i kaʻaeʻana i ka ho'āʻoʻole e hoʻopau i ke kaomi wai.He ʻokoʻa nui kēia ma waena o ka maʻamau API a me ka maʻamau Kina.ʻAʻole koi ʻo PSL1 i ka nānā ʻole luku ʻole, pono ʻo PSL2 i ka nānā ʻole luku ʻana i kēlā me kēia.