Nke a nkọwapụta na-ekpuchi ọnụ mgbidi nchara ọkpọkọ ikpo nke cylindrical udi ma na-emetụta ọkpọkọ ikpo nke ígwè cylinder eme dị ka a na-adịgide adịgide na-ebu ibu, ma ọ bụ dị ka shei na-etolite nkedo-na-ebe ihe ikpo.
Cangzhou Spiral Steel pipes Group co., Ltd na-enye ọkpọkọ welded maka ngwa ọrụ na-arụ ọrụ na dayameta site na 219mm ruo 3500mm, na otu ogologo ruo mita 35.