Ọkọlọtọ ọkpọkọ ERWbụ ndị a:
API 5L, ASTM A53 B, ASTM A178, ASTM A500/501, ASTM A691, ASTM A252, ASTM A672

API 5L Standard aims gas na mmiri na mmanụ na gas ụlọ ọrụ maka ntụaka, nke a na-eji maka enweghị nkebi ígwè ọkpọkọ na welded ígwè ọkpọkọ, gụnyere nkịtị ọdụ ụgbọ mmiri na ọdụ ụgbọ mmiri, ọkpọkọ socket n'ọdụ ụgbọ mmiri na kpọmkwem iyi tube (TFL) na ọdụ ụgbọ mmiri nwere maka otu. nhazi tube njikọ.

ASTM A53 ọkpọkọ bu n'uche maka ngwa igwe na ngwa nrụgide ma bụrụkwa nke a na-anabata maka ojiji nkịtị na uzuoku, mmiri, gas na ahịrị ikuku.

Standardkpụrụ ASTM A178 maka tubes na-eguzogide ọkụ eletrik nwere opekempe-okpukpu nke carbon steel na carbon-manganese steel ga-eji na tubes ji esi mmiri ọkụ, anwụrụ ọkụ, flues superheater na njedebe nchekwa.

ASTM A500 na-ekpuchi ọkụ carbon steel welded na enweghị nkebi, gburugburu, square, akụkụ anọ ma ọ bụ ụdị pụrụ iche maka welded, riveted, ma ọ bụ bolted owuwu nke àkwà mmiri na ụlọ, yana maka ebumnuche nhazi izugbe.

ASTM A691 na-ekpuchi carbon na alloy ígwè ọkpọkọ, eletriki-fusion-welded na filler metal agbakwunyere, ekepụtara site na nrụgide-arịa dị larịị nke ọtụtụ nyocha na ọkwa ike ma dabara adaba maka ọrụ nrụgide dị elu na oke okpomọkụ.

ASTM A252 na-ekpuchi ọnụ ala mgbidi cylindrical steel pipe piles nke ígwè cylinder na-arụ ọrụ dị ka onye na-ebu ibu na-adịgide adịgide ma ọ bụ dị ka shei na-emepụta ikpo ihe nkedo n'ebe.

ASTM A672 na-ekpuchi ọkụ eletrik-njikọ-welded ígwè ọkpọkọ maka ọrụ nrụgide dị elu na oke okpomọkụ.