Ngā paipa rinoka whakarōpūtia kia rite ki te āhua whakawhiti-wāhanga ki ngā paipa porowhita, tapawhā, tapawhā hāngai, me te āhua motuhake; kia rite ki ngā rauemi ki ngā paipa maitai hanganga waro, ngā paipa maitai hanganga iti-koranu, ngā paipa maitai koranu, me ngā paipa hiato; ā, kia rite ki te whakamahinga ki ngā paipa mō ngā paipa kawe, ngā hanganga hangarau, ngā taputapu wera, ngā ahumahi hinu matū, te hanga mīhini, te keri whenua, me ngā taputapu pēhanga teitei. Kia rite ki te tukanga whakaputa, ka wehea ēnei ki ngā paipa maitai kore hononga me ngā paipa maitai whakarewa. Ka whakarōpūtia anō ngā paipa maitai kore hononga ki ngā momo hurihuri wera me ngā momo hurihuri matao (tōia), ko ngā paipa maitai whakarewa ka wehea ki ngā paipa whakarewa hononga tika me ngā paipa whakarewa hononga porowhita.
He maha ngā tikanga hei whakaatu i ngā tawhā āhuahanga o te paipa. Kei raro nei ngā whakamārama mō ngā āhuahanga paipa e whakamahia whānuitia ana: NPS, DN, OD me te Schedule.
(1) NPS (Rahi Paipa Ingoa)
Ko te NPS te paerewa o Amerika Te Raki mō ngā paipa pēhanga teitei/iti me te pāmahana teitei/iti. He tau kore-rahi e whakamahia ana hei tohu i te rahi o ngā paipa. Ko te tau i muri i te NPS e tohu ana i te rahi paipa paerewa.
Ko te NPS e ahu mai ana i te pūnaha IPS (Iron Pipe Size) o mua. I whakatūria te pūnaha IPS hei wehewehe i ngā rahi paipa, me ngā inenga e whakaatuhia ana i roto i ngā inihi e tohu ana i te diameter o roto tata. Hei tauira, ko te paipa IPS 6" e tohu ana i te diameter o roto e tata ana ki te 6 inihi. I tīmata ngā kaiwhakamahi ki te kī i ngā paipa he paipa 2-inihi, 4-inihi, 6-inihi rānei.
(2) Diameter Ingoa DN (Diameter Ingoa)
Diameter Ingoa DN: He tohu rerekē mō te diameter ingoa (pore). Whakamahia ana i roto i ngā pūnaha paipa hei tohu huinga reta-tau, kei roto ko ngā reta DN e whai ake nei ko te tauoti kore-ahu. Me mōhio ko te pore ingoa DN he tauoti porowhita watea mō ngā kaupapa tohutoro, he hononga korekore noa iho ki ngā rahinga hanga tuturu. Ko te tau i muri i te DN ka inehia i roto i ngā mirimita (mm). I roto i ngā paerewa Hainamana, he maha ngā wā ka tohua ngā diameter paipa ko DNXX, pērā i te DN50.
Kei roto i ngā diameter paipa te diameter o waho (OD), te diameter o roto (ID), me te diameter ingoa (DN/NPS). Kāore te diameter ingoa (DN/NPS) e ōrite ki te diameter o waho, o roto rānei o te paipa. I te wā e hangaia ana, e tāutahia ana hoki, me whakatau te diameter o waho me te matotoru o te pakitara e ai ki ngā whakaritenga paerewa hei tatau i te diameter o roto o te paipa.
(3) Te Diameter o Waho (OD)
Diameter o Waho (OD): Ko te tohu mō te diameter o waho ko Φ, ā, ka taea te tohu ko OD. I te ao whānui, ko ngā paipa maitai e whakamahia ana mō te kawe wai ka whakarōpūtia kia rua ngā raupapa diameter o waho: Raupapa A (ngā diameter o waho nui ake, imperial) me Raupapa B (ngā diameter o waho iti ake, ine).
He maha ngā raupapa paipa rino whānui-waho e wātea ana puta noa i te ao, pērā i te ISO (International Organization for Standardization), JIS (Hapani), DIN (Tiamana), me BS (UK).
(4) Te Matotoru o te Pakitara Paipa
I te marama o Poutū-te-rangi 1927, i whakahaerehia e te Komiti Paerewa o Amerika tētahi rangahau ahumahi, ā, i whakauruhia he pikinga iti ake i waenga i ngā taumata matotoru pakitara paipa matua e rua. Ka whakamahia e tēnei pūnaha te SCH hei tohu i te matotoru ingoa o ngā paipa.
EHONG STEEL -- ngā rahinga o te paipa maitai
Wā tuku: 22 o Ākuhata-2025
