1. Pono ke kūʻai ʻana i nā ʻano paipu kila:
A. Hoʻokaʻawale ʻia e ke ʻano: paipu kila hili pololei, paipu kila ʻole, paipu kila spiral, etc.
B. Ka hoʻokaʻawale ʻana o nā ʻano ʻāpana keʻa o nā paipu kila humuhumu pololei: paipu huinahā, paipu rectangular, paipu ellipse, paipu ellipse palahalaha, paipu semicircular, etc.

2. Nā mea e hoʻomaopopo ai:
ʻAʻole lawa ka mānoanoa o ka pā o ka paipu kila. ʻO ka hoʻohana ʻana i ka ʻīpuka, ʻoi aku ka mānoanoa o ka waha o ka paipu kila me ka pale hāmare, akā e wehe ʻia ke ʻano kumu ma ke ana ʻana me kahi mea kani.
B. E hoʻohana i nā hili pololei e like me nā paipu kila ʻole. ʻOi aku ka nui o nā weld seam pololei ma mua o hoʻokahi weld longitudinal. Hoʻomaʻamaʻa ʻia ka paipu kila ikaika me ka mīkini, i ʻike mau ʻia ʻo polishing. Me he mea lā ʻaʻohe wahi āpau e holo ʻole.
C. I kēia manawa aia kekahi ʻano ʻoi aku ka maʻalahi o ka paipu kila seamless, ʻo ia hoʻi ka thermally hoʻonui ʻia ke kila paipu. Ma hope o ka hoʻonui ʻia ʻana, aia ka pauka kepau ma loko, a aia nā kaha kuni ma waho. ʻAʻole ʻike ʻia nā welds. He nui nā paipu kila nui i kūʻai ʻia me ka maʻalahi me ka hoʻohana ʻana i kēia ʻano paipu kila no ka ʻimi ʻana i ka waiwai nui.
D. Hoʻohana ʻia nā paipu kila wiliwili ʻia i ka pōʻaiapuni e hōʻike i nā paipu kila ʻole a me nā paipu kila humuhumu pololei.