Ko te ASME SA179 he paerewa mō ngā paipa maitai kore hononga mō te whakawhiti wera i hangaia e te American Society of Mechanical Engineers (ASME), e tohu ana i ngā tohu matua pēnei i te tukanga hanga, te hanganga matū, ngā āhuatanga miihini me te manawanui ā-ahu o te paipa. Mā tēnei paerewa ka whakarite kia tino pai te ātete o te paipa maitai ki te pēhanga, te kawe wera me te ātete waikura i roto i ngā momo whakawhiti wera, ā, he pai mō ngā āhuatanga mahi uaua i roto i ngā ahumahi matū, hiko, kai me ētahi atu ahumahi.
Ngā painga matua o te tukanga tuhi matao
Ko te paipa tuitui matao paerewa o Amerika e whakamahi ana i te hangarau tuhi pāmahana rūma, ā, he mea hanga tika mā roto i ngā pokepokea. Ko ōna āhuatanga e whai ake nei:
Rahi tino tika: he tino tika te manawanui ki te diameter o waho (pēnei i te ±0.10mm), he rite te matotoru o te pakitara, he pai mō te hanganga whakawhiti wera hiri-teitei.
Te whakapakari i ngā āhuatanga ā-pūkaha: mā te whakarerekētanga makariri ka hāngai ngā kakano, ka whakapai ake i te kaha kume (≥325MPa) me te pakeke, me te pupuri tonu i te pakari.
Kounga mata tino pai: he maeneene te pakitara o roto (taratara Ra≤0.8μm), ka whakaiti i te ātete wai, ā, ka arotau i te pai o te whakawhiti wera.
Ngā whakaritenga rahi kī
He maha ngā whakaritenga e hipokina ana e te ASME SA179 hei whakatutuki i ngā hiahia o ngā āhuatanga whakawhiti wera rerekē:
Te whānuitanga o te diameter o waho (mm) Te whānuitanga o te matotoru o te pakitara (mm) Ngā āhuatanga tono noa
12.7~25.4 1.24~2.11 Whakawhiti wera pereti kiato
25.4~38.1 2.11~3.81 Whakawhiti wera anga matū me te ngongo
38.1~50.8 3.81~5.59 Pūwhakamātao pēhanga teitei o te teihana hiko
Ngā tono ahumahi
1. Ahumahi matū
Te whakamahine hinu: Ngā paihere ngongo whakawhiti wera e whakamahia ana i roto i ngā tauhohenga hauwai, ātete ki te waikura hauwai whanariki (te kukū H₂S ≤50ppm).
Te whakaputanga waikawa whanariki: Me whakamatao te hau SO₂ pāmahana teitei (≤450℃), me paninga ārai-waikura ina whakamahia te maitai waro.
2. Mana hiko
Ngā paipa whakapūmau: I roto i ngā tipu hiko wera, ka tu atu ngā paipa maitai SA179 ki te pēhanga mamaoa 0.1MPa, me te kawe wera o te 50W/(m·K), me te pikinga o te pai o te whakapūmau o te 15%.