Nā hiʻohiʻona huahana
1. Hoʻolālā paʻa, hoʻolālā kūpono, rigidity maikaʻi o ka valve, hele mālie a me ka coefficient kū'ē kahe liʻiliʻi.
2. ʻO kaʻili hoʻopaʻa i hanaʻia me ke kila kila a me ka carbide cemented me ke ola lōʻihi.
3. Paʻa paʻi graphite maʻalahi, hoʻopaʻa paʻa pono, maʻalahi a maʻalahi ka hana.
4. Hoʻokomo ʻia nā ʻano hoʻokele kaʻa i ka manual, uila, pneumatic, gear transmission a me nā ʻano hana; wīwī wiliwī hoʻokahi kiwikā, pāpaʻa pahu pahu hoʻokahi a me ke ʻano ʻīpuka pālua.
5. Hoʻohana nui ʻia ia i nā huahana aila, wai a me nā paipu mahu o ka ʻaila, ʻoihana kemika a me nā mea kanu wela e like me ka hoʻomaka ʻana a me ka pani ʻana i nā mea hana no ka hoʻohui ʻana a i ʻole ka ʻoki ʻana i ka waena ma nā pipeline.