Usayizi Wepayipi Lokuqamba

Uyini Usayizi Wepayipi Lokuqamba?

Usayizi Wepayipi Lokuqamba(NPS)iyisethi yaseNyakatho Melika yosayizi abajwayelekile bamapayipi asetshenziselwa ukucindezela okuphezulu noma okuphansi kanye namazinga okushisa. Igama elithi NPS lisekelwe ohlelweni lwangaphambili “lwe-Iron Pipe size” (IPS).

Leyo sistimu ye-IPS yasungulwa ukuze ichaze usayizi wepayipi. Usayizi wawumelela isilinganiso esimaphakathi sangaphakathi sepayipi ngamayintshi. Ipayipi le-IPS 6″ ilelo ubukhulu balo bangaphakathi bungaba amayintshi angu-6. Abasebenzisi baqala ukubiza ipayipi ngokuthi 2inch, 4inch, 6inch pipe nokunye. Ukuqala, usayizi wepayipi ngalinye wakhiqizwa ukuze ube nogqinsi olulodwa, okwathi kamuva lwabizwa ngokuthi olujwayelekile (STD) noma isisindo esijwayelekile (STD.WT.). Ububanzi obungaphandle bepayipi bulinganiselwe.

Njengezidingo zezimboni eziphatha uketshezi olunomfutho ophakeme, amapayipi enziwe anezindonga eziwugqinsi, osekwaziwa ngokuthi anamandla ngokwengeziwe (XS) noma asindayo ngokwengeziwe (XH). Izimfuneko zengcindezi ephakeme zanda ngokuqhubekayo, ngamapayipi odonga aminyene. Ngokuvumelana nalokho, amapayipi enziwe anezindonga eziphindwe kabili ezinamandla (XXS) noma ezisindayo eziphindwe kabili (XXH), kuyilapho amadayamitha angaphandle ajwayelekile awashintshile. Qaphela ukuthi kule webhusayithi kuphela imigomoXS&XXSzisetshenziswa.

Ipayipi Isheduli

Ngakho-ke, ngesikhathi se-IPS kuphela ama-walltick amathathu ayesetshenziswa. Ngo-March 1927, i-American Standards Association yenza inhlolovo yemboni futhi yenza uhlelo oluqoke ukushuba kwezindonga ngokusekelwe ezinyathelweni ezincane phakathi kosayizi. Igama okwaziwa ngokuthi usayizi wepayipi okuzisholo lona lithathela indawo usayizi wepayipi lensimbi, kanye neshejuli yetemu (I-SCH) yasungulwa ukuze icacise ubukhulu bodonga lwepayipi. Ngokungeza izinombolo zeshejuli kumazinga e-IPS, namuhla sazi ububanzi bodonga oluhlukahlukene, okungukuthi:

SCH 5, 5S, 10, 10S, 20, 30, 40, 40S, 60, 80, 80S, 100, 120, 140, 160, STD, XS kanye ne-XXS.

Usayizi wepayipi lokuzisholo (I-NPS) ingumklami ongenasici wosayizi wepayipi. Ibonisa usayizi wepayipi ojwayelekile lapho ulandelwa inombolo yegama elithile ngaphandle kophawu lwamayintshi. Isibonelo, i-NPS 6 ikhombisa ipayipi ububanzi balo bangaphandle bungu-168.3 mm.

I-NPS ihlobene ngokukhululekile kakhulu nobubanzi bangaphakathi ngamayintshi, futhi i-NPS 12 nepayipi elincane linobubanzi obungaphandle obukhulu kunomklami wosayizi. Ku-NPS 14 nangaphezulu, i-NPS ilingana no-14inch.

Ku-NPS enikeziwe, ububanzi bangaphandle buhlala bunjalo futhi ukujiya kodonga kukhuphuka ngenombolo yeshejuli enkulu. Ububanzi bangaphakathi buzoncika ekugqinsileni kodonga lwepayipi olucaciswe inombolo yeshejuli.

Isifinyezo:
Usayizi wepayipi ucaciswe ngezinombolo ezimbili ezingena-dimensional,

• usayizi wepayipi ojwayelekile (NPS)
• inombolo yeshejuli (SCH)

futhi ubuhlobo phakathi kwalezi zinombolo bunquma ububanzi bangaphakathi bepayipi.

Ubukhulu bepayipi Lensimbi Engagqwali kunqunywa i-ASME B36.19 emboza ububanzi obungaphandle kanye nokujiya kodonga Lweshejuli. Qaphela ukuthi ukujiya kodonga olungenasici ku-ASME B36.19 konke kunesijobelelo esithi “S”. Osayizi abangenaso isijobelelo esithi “S” baku-ASME B36.10 ehloselwe amapayipi ensimbi ye-carbon.

I-International Standards Organisation (ISO) iphinde isebenzise uhlelo olunomklami ongenasici.
Ububanzi begama (DN) isetshenziswa kusistimu yeyunithi yemethrikhi. Ibonisa usayizi wepayipi ojwayelekile lapho ulandelwa inombolo yokuqokwa kosayizi othile ngaphandle kophawu lwemilimitha. Isibonelo, i-DN 80 igama elilinganayo le-NPS 3. Ngezansi kwetafula elinokulingana kwe-NPS nosayizi wamapayipi e-DN.

Qaphela: Ku-NPS ≥ 4, i-DN ehlobene = 25 iphindwe ngenombolo ye-NPS.

Ingabe manje uyini "ein zweihunderter Rohr"?. AmaJalimane asho ngaleyo payipi i-NPS 8 noma i-DN 200. Kulokhu, amaDashi akhuluma nge "8 duimer". Ngiyafisa ukwazi ukuthi abantu bakwamanye amazwe balikhombisa kanjani ipayipi.

Izibonelo ze-OD yangempela kanye ne-ID

Amadayamitha angempela angaphandle

• I-NPS 1 i-OD yangempela = 1.5/16″ (33.4 mm)
• I-NPS 2 i-OD yangempela = 2.3/8″ (60.3 mm)
• I-NPS 3 i-OD yangempela = 3½” (88.9 mm)
• I-NPS 4 i-OD yangempela = 4½” (114.3 mm)
• I-NPS 12 i-OD yangempela = 12¾” (323.9 mm)
• I-NPS 14 i-OD yangempela = 14″(355.6 mm)

Ububanzi bangempela bangaphakathi bepayipi eliyiyintshi elingu-1.

• I-NPS 1-SCH 40 = OD33,4 mm – WT. 3,38 mm – ID 26,64 mm
• I-NPS 1-SCH 80 = OD33,4 mm – WT. 4,55 mm – ID 24,30 mm
• I-NPS 1-SCH 160 = OD33,4 mm – WT. 6,35 mm – ID 20,70 mm

Njengoba kuchazwe ngenhla, abukho ububanzi bangaphakathi obuhambisana neqiniso elingu-1″ (25,4 mm).
Ububanzi bangaphakathi bunqunywa ubukhulu bodonga (WT).

Amaqiniso okudingeka ukwazi!

Isheduli 40 kanye ne-80 esondela ku-STD ne-XS futhi ezimweni eziningi ziyafana.
Kusukela ku-NPS 12 nangaphezulu kogqinsi lwezindonga phakathi kweshejuli 40 ne-STD zihlukile, kusukela ku-NPS 10 nangaphezulu kogqinsi lodonga phakathi kweshejuli 80 ne-XS zihlukile.

Isheduli 10, 40 kanye no-80 ezimweni eziningi ziyafana neshejuli 10S, 40S kanye no-80S.
Kodwa qaphela, kusukela ku-NPS 12 - NPS 22 ubukhulu bodonga kwezinye izimo buhlukile. Amapayipi anesijobelelo esithi “S” anophawu lodonga oluncane kulolo hlu.

I-ASME B36.19 ayibambi bonke osayizi bamapayipi. Ngakho-ke, izidingo zobukhulu be-ASME B36.10 zisebenza epayipini lensimbi engagqwali lamasayizi namashejuli angamboziwe i-ASME B36.19.