Hiki ke hoʻokaʻawale ʻia ka paipu hao i loko o: ka paipu hao haʻahaʻa, ka paipu ʻano hao, ka paipu hao kiʻekiʻe, ka paipu kila waikawa kūpaʻa wela, ka paipu hao wela kiʻekiʻe.

ʻO nā paipu kila no ka paipu, nā lako wela, ka ʻoihana mīkini, ka ʻaila, ka ʻeli honua, ka ipu, ka ʻoihana kemika, nā paipu kila kumu kūikawā, a me nā kumu ʻē aʻe.

He ʻokoʻa ke kaʻina hana hana, ua māhele ʻia i ʻelua mau ʻano kila humuhumu wela (extrusion) a me nā ʻano kila humuhumu anu (ʻōwili).

Ua hoʻokaʻawale ʻia nā paipu kila wili ʻole wela i nā paipu kila maʻamau, nā paipu paila haʻahaʻa a me ka waena, nā paipu paila kiʻekiʻe, nā paipu kila metala, nā paipu kila kila, nā paipu haki petroleum, nā paipu geological a me nā paipu kila ʻē aʻe.

ʻO ka paipu kila wili anu (dial) ma waho aʻe o ka paipu kila maʻamau, ka paipu kila paila haʻahaʻa a me ka waena, ka paipu kila paila kiʻekiʻe, ka paipu kila metala, ka paipu kila kila, ka paipu kila ʻaila, a me nā paipu kila ʻē aʻe, a me ka paipu kila kalapona lahilahi, ka paipu kila metala lahilahi, ka paipu kila kila, a me ka paipu kila ʻano kūikawā. ʻO nā pae hoʻohālikelike:GB/T8162-2008 (paipu kila humuhumu no ke kūkulu ʻana), GB/T8163-2008 (paipu kila humuhumu no ka lawe ʻana i ke wai),GB3087-2008 (paipu kila humuhumu no ka paila haʻahaʻa a me ke kaumaha waena),GB5310-2008 (paipu kila humuhumu no ka paila kaomi kiʻekiʻe), GB5312-2009 (paipu kila humuhumu no ke kila kalapona a me ke kila manganese kalapona no nā moku),GB6479-2013 (paipu kila humuhumu no nā lako mea hoʻomomona kiʻekiʻe), a pēlā aku. Inā makemake ʻoe i kā mākou huahana, e ʻoluʻolu e leka uila mai iā mākou ma o ka leka uila.