ʻElua ʻano o nā paipu kila humuhumu ʻole: nā paipu kila humuhumu ʻōwili wela a me nā paipu kila humuhumu ʻōwili anu (dial).
Ua māhele ʻia nā paipu kila humuhumu wela i nā paipu kila maʻamau, nā paipu kila paila haʻahaʻa a me ka waena, nā paipu kila paila kiʻekiʻe, nā paipu kila metala, nā paipu haki ʻaila, nā paipu kila geological a me nā paipu kila ʻē aʻe.
Ma waho aʻe o nā paipu kila maʻamau, nā paipu kila paila haʻahaʻa a me ke kaumaha waena, nā paipu kila paila kiʻekiʻe, nā paipu kila huila, nā paipu haki ʻaila, a me nā paipu kila ʻē aʻe, nā paipu kila wili anu (dial) e komo pū ana me nā paipu kila lahilahi kalapona, nā paipu kila lahilahi me nā paipu kila, nā paipu kila profiled, a pēlā aku.
ʻOi aku ka nui o ke anawaena o waho o ka paipu wili wela ma mua o 32mm, a ʻo ka mānoanoa o ka paia he 2.5-75mm. Hiki i ke anawaena o ka paipu kila wili 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 paia lahilahi ke piʻi i ka 5mm, a ʻoi aku ka mānoanoa o ka paia ma mua o 0.25mm. ʻOi aku ka pololei o ka ʻōwili anu ma mua o ka ʻōwili wela.
ʻO nā paipu kila humuhumu 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 kila kūkulu haʻahaʻa ʻē aʻe a i ʻole 40Cr, 30CrMnSi, 45Mn2, 40MnB a me nā kila hao ʻē aʻe i ʻōwili wela ʻia a ʻōwili anu ʻia paha.
ʻO 10, 20 a me nā paipu kila kalapona haʻahaʻa ʻē aʻe e hoʻohana nui ʻia no nā paipu lawe wai. Hoʻohana ʻia nā paipu humuhumu ʻole i hana ʻia me ke kila kalapona waena e like me 45 a me 40Cr e hana i nā ʻāpana mīkini, e like me nā ʻāpana i hoʻoluhi ʻia o nā kaʻa a me nā tractors. Ma ke ʻano laulā, hoʻohana ʻia nā paipu kila humuhumu ʻole e hōʻoia i ka ikaika a me nā hoʻāʻo palahalaha. Hāʻawi ʻia nā paipu kila ʻōwili wela i kahi mokuʻāina ʻōwili wela a i ʻole i mālama ʻia i ka wela; hāʻawi ʻia nā paipu kila ʻōwili anu i kahi mokuʻāina mālama wela.