ʻElua ʻano o nā paipu kila maʻemaʻe: ʻo nā paipu kila wela a me ke anuanu (dial).
Hoʻokaʻawale ʻia nā paipu kila maʻemaʻe wela i nā paipu kila maʻamau, nā paipu kila haʻahaʻa haʻahaʻa a me nā paipu kila, nā paipu kila kiʻekiʻe, nā paipu kila kila, nā paipu pohā ʻaila, nā paipu kila geological a me nā paipu kila ʻē aʻe.
Ma waho aʻe o nā paipu kila maʻamau, nā paipu kila haʻahaʻa a me ka haʻahaʻa haʻahaʻa, nā paipu kila kiʻekiʻe, nā paipu kila huila, nā paipu pohā ʻaila, a me nā paipu kila ʻē aʻe, ʻo nā paipu kila liʻiliʻi i hui pū ʻia me carbon thin-walled pipe. nā paipu, nā paipu kila lahilahi, nā paipu kila profiled, etc.
ʻOi aku ka nui o ke anawaena o waho o ka paipu wili wela ma mua o 32mm, a ʻo ka mānoanoa o ka pā he 2.5-75mm. ʻO ke anawaena o ka paipu kila liʻiliʻi i ʻōwili ʻia a hiki i 6mm, a hiki i ka mānoanoa o ka paia ke hiki i 0.25mm. Hiki ke hiki i ka 5mm ke anawaena o waho o ka paipu pā lahilahi, a ʻo ka mānoanoa o ka pā ma lalo o 0.25mm. ʻOi aku ka pololei o ke ana ʻana ma mua o ka ʻōwili wela.
ʻO nā paipu kila ʻole no ka hoʻohana maʻamau: hana ʻia me ke kila kalapona kiʻekiʻe e like me 10, 20, 30, 35, 45, 16Mn, 5MnV a me nā mea hao haʻahaʻa haʻahaʻa haʻahaʻa a i ʻole 40Cr, 30CrMnSi, 45Mn2, 40MnB a me nā mea hao ʻē aʻe. ʻōwili wela a ʻōwili anu paha.
ʻO 10, 20 a me nā paipu kalapona kila haʻahaʻa ʻē aʻe i hoʻohana nui ʻia no nā pipeline lawe wai. Hoʻohana ʻia nā paipu seamless i hana ʻia me ke kila kalapona maʻamau e like me 45 a me 40Cr e hana i nā ʻāpana mechanical, e like me nā ʻāpana koʻikoʻi o nā kaʻa a me nā tractors. ʻO ka maʻamau, hoʻohana ʻia nā paipu kila ʻole e hōʻoia i ka ikaika a me nā hoʻāʻo palahalaha. Hāʻawiʻia nā paipu kila wela i loko o kahi kūlana wela a wela paha; Hāʻawiʻia nā paipu kila i'ōwiliʻia ma kahi kūlana wela.