ʻOi aku ka nui o ke anawaena o waho o ka paipu wili ʻole wela ma mua o 32mm, a ʻo ka mānoanoa o ka paia he 2.5-200mm. Hiki i ke anawaena o waho o ka paipu kila wili ʻole anu ke piʻi i ka 6mm, a hiki i ka mānoanoa o ka paia ke piʻi i ka 0.25mm. Hiki i ke anawaena o waho o ka paipu lahilahi ke piʻi i ka 5mm a ʻoi aku ka mānoanoa o ka paia ma mua o 0.25mm.

ʻO ka paipu kila humuhumu maʻamau i hoʻohana ʻia he 10, 20, 30, 35, 45 a me nā kila kila kalapona kiʻekiʻe ʻē aʻe 16Mn, 5MnV a me nā kila kila haʻahaʻa haʻahaʻa a i ʻole 40Cr, 30CrMnSi, 45Mn2, 40MnB a me nā kila kila ʻē aʻe i hoʻopaʻa ʻia i ʻōwili wela a i ʻōwili anu paha. 10, 20 a me nā kila kila haʻahaʻa ʻē aʻe i hana ʻia ai ka paipu humuhumu e hoʻohana nui ʻia no ka pipeline wai. 45, 40Cr a me nā kila kalapona waena ʻē aʻe i hana ʻia me ka paipu humuhumu e hana i nā ʻāpana mīkini, e like me nā kaʻa, nā ʻāpana tractors i hoʻokaumaha ʻia. ʻO ka hoʻohana maʻamau o ka paipu kila humuhumu e hōʻoia i ka ikaika a me ka hoʻāʻo palahalaha. Hāʻawi ʻia nā paipu kila humuhumu wela i ke kūlana wela a i ʻōwili wela ʻia. Hoʻomehana ʻia ka lawe ʻana i ʻōwili anu.