I loko o nā pilina flange paipu o nā hale hana kemika, pili pololei ke kūpaʻa ʻana o nā bolts i ka hana palekana a me nā kumukūʻai mālama o ka ʻōnaehana. ʻO ka ʻāpana i wili ʻole ʻia o nā bolts semi-threaded maʻamau he mea maʻalahi ia i ka pala, ʻoiai ʻo nā bolts wili piha kila kila 304, me kā lākou hoʻolālā kaula piha a me ke kūpaʻa maikaʻi loa i ka pala, hoʻopau i ka pilikia o ka popo kūloko ma kona kumu, e lilo ana lākou i koho hilinaʻi no nā pilina flange pipeline kemika. Eia kekahi, i nā hui flange i hoʻopilikia ʻia e ka haʻalulu, hiki i ka hoʻohana ʻana i nā mea holoi puna M10 ke hoʻoikaika hou i ka hilinaʻi o ka pilina e kūʻē i ka wehe ʻana.