te rahi me te rahi o te paipa maitai

Ko ngā pou rino e wehenga ana e ngā tikanga rereke: e hāngai ana ki te āhua o te whakawhitinga ki ngā tapawhā pōro, tapawhā ōrite, tapawhā hui, me ngā āhua motuhake; e hāngai ana ki te matū ki te rino hanga karika, rino hanga karu-whakamua iti, rino karu-whakamua, me ngā pou takotoranga; me te whakamahinga ki ērā e whakamahia ana hei rere wai, hanganga inuara, taputapu whakapai ake i te wera, umanga hinu me te kimi, hanga mekameka, rongoa pūpahi, me ngā taputapu toto-whakapā. I runga i ngā tikanga hanga, kei te wehenga ki ngā pou rino kāore he tāpapa (e whirinaki ana ki te kāpua māmā me te kāpua makariri/tāwhai) me ngā pou rino kāpua (kei te wehenga anō ki te tāpapa tōraro rārangi me te tāpapa kōtukutuku).

Ko ngā tātai rahi o ngā pou ka whakawhitinga i ētahi ara. Ko te whai muri nei he whakamārama i ngā tikanga noho tata: NPS, DN, OD me te Rārangi.

(1) NPS (Rahi Pou Tuarangi)
Ko te NPS tētahi tātai a Piritania kei Te Ipurangi e whakamahia ana ki ngā kōpiko ki raro i ngā pāmahana me ngā whakarewa wā tonu. Ko tētahi tau tohutoro e whakamahia ana kia whakahuatia ngā rahi o ngā kōpiko. Ko te uara e whai muri ana i te "NPS" e hāngai ana ki tētahi rahi kōpiko tohutoro.
I whanake mai tēnei tātai i te tātai a mua ko te IPS (Rahi Kōpiko Rino) i hangaia kia kitea ai ngā rereketanga o ngā rahi kōpiko e mātai ana i te tāwhai roto e ine mā te ina. Hei tauira, ko te kōpiko IPS 6″ he tāwhai roto e 6 ina. Nō reira, kua māmā ai te kiia i ngā rahi tohutoro (hei tauira, 2-ina, 4-ina, 6-ina).

(2) Te Tāwhai Tohutoro DN (Diameter Nominal)
Ko te DN ka tīariari hei whakaingo mō te tōraroa tōpū. Ka whakamahia ki ngā punaha auta hei tohu ingoa-panuku, e whirinui ana i ngā reta "DN" kātahi ka whai mai tētahi tau tōpū. Me mārama hoki ko te uara DN e tohu ana i tētahi tātata tākarotia me te kore e ōrite ki ngā āhua hangaia. Ki ngā tīariari Hainamana, ko te tōraroa auta e tohu ana ko DNXX (hei tauira, DN50), kei hea te tau e whakaputua tikangia ana ki te mitamano (mm).
Ko ngā kupu mō te tōraroa auta ko te tōraroa ake (OD), te tōraroa roto (ID), me te tōraroa tōpū (DN/NPS). Kāore te tōraroa tōpū (DN/NPS) e ōrite ki te OD tūturu, ID rānei; engari, ko ngā tīariari e whakaae ana i ngā tōraroa ake me te neke o te rāranga e hiahiatia ana mō te hanga me te tāutanga, mai i reira ka tāwhaihia te tōraroa roto.

(3) Tōraroa ake (OD)
E tohuia e te tārama Φ, te tāpiri rānei OD, ko te tāwhai tāwhai he āhua matua. Kei te ao, ko ngā papa toto mā te hinga wai e whakarōpū ana i ngā tāwhai tāwhai e rua: Tāwhai A (tāwhai whānui, tāwhai rahi ake) me Tāwhai B (tāwhai irirangi, tāwhai iti ake).
Ko ngā tāwhai tāwhai e whakarārangitia ana e ngā tāwhai whakaaetanga ao, tae atu ki te ISO (Whakaaetanga Ao Whakaaetanga), JIS (Whakaaetanga Ahumoni Hapani), DIN (Institutu Whakaaetanga Tiamani), me BS (Whakaaetanga Peretania).

(4) Hoahoa Papa Papa
I Poutū 1927, i whakaurua e te Komiti Whakaaetanga o Amerika tētahi punaha e whakarārangi ana i ngā uara tōke tāwhai waenganui i waenganui i ngā kōtaha matua e rua i muri i te uiui ake i te ao hokohoko. Kei te whakamahi tēnei punaha i te kupu "Hoahoa" (poto noa ki te SCH) hei tohu i te tōke tāwhai papai o ngā papa.

EHONG STEEL--āhua papa toto