I ka lilo ʻana o nā koi o kānaka no ka palekana o ke kaiapuni i mea paʻakikī loa, ke piʻi nei hoʻi nā koi no nā valves, a ke lilo nei nā koi no ka pae leaka i ʻae ʻia o nā mea ʻawaʻawa, hiki ke puhi a me nā mea pahū i nā mea kanu petrochemical i mea paʻakikī loa. He mea pono ʻole nā ​​valves i nā mea kanu petrochemical. , He nui kona ʻano a me ka nui, a ʻo ia kekahi o nā kumu leaka nui i loko o ka hāmeʻa. No nā mea ʻawaʻawa, hiki ke puhi a me nā mea pahū, ʻoi aku ka koʻikoʻi o nā hopena o ka leaka waho o ka valve ma mua o ka leaka kūloko, no laila he mea nui loa nā koi leaka waho o ka valve. ʻO ka leaka haʻahaʻa o ka valve ʻo ia hoʻi he liʻiliʻi loa ka leaka maoli, ʻaʻole hiki ke hoʻoholo ʻia e nā hoʻokolohua sila kaomi wai a me ke kaomi ea maʻamau. Pono ia i nā ʻano ʻepekema hou aʻe a me nā mea hana akamai e ʻike i ka leaka liʻiliʻi o waho.

ʻO nā kūlana maʻamau i hoʻohana ʻia no ka ʻike ʻana i ka leakage haʻahaʻa ʻo ISO 15848, API624, EPA method 21, TA luft a me Shell Oil Company SHELL MESC SPE 77/312.

I waena o lākou, ʻo ka papa ISO A ka mea i loaʻa nā koi kiʻekiʻe loa, ukali ʻia e ka papa SHELL A. I kēia manawa,Ua loaʻa iā NSEN nā palapala hōʻoia maʻamau ma lalo nei;

ISO 15848-1 papa A

API 641

TA-Luft 2002

I mea e hoʻokō ai i nā koi o ka leakage haʻahaʻa, pono nā hoʻoheheʻe valve e hoʻokō i nā koi o ka hoʻāʻo kinoea helium. No ka mea he liʻiliʻi ke kaumaha molekala o nā molekala helium a maʻalahi ke komo, ʻo ke ʻano o ka hoʻoheheʻe ʻana ke kī. ʻO ka lua, ʻo ke sila ma waena o ke kino valve a me ka uhi hopena he sila gasket pinepine ia, he sila static, kahi maʻalahi ke hoʻokō i nā koi leakage. Eia kekahi, ʻo ke sila ma ke kumu valve he sila dynamic. Hiki ke lawe maʻalahi ʻia nā ʻāpana graphite mai ka ʻūlū ʻana i ka wā e neʻe ai ke kumu valve. No laila, pono e koho ʻia ka ʻūlū haʻahaʻa kūikawā a pono e hoʻomalu ʻia ka hakahaka ma waena o ka ʻūlū ʻana a me ke kumu valve. ʻO ka hakahaka ma waena o ka lima kaomi a me ke kumu valve a me ka pahu hoʻopiha, a kaohi i ka ʻino o ka hana ʻana o ke kumu valve a me ka pahu hoʻopiha.