Cad is Sceideal Píopaí ann?
Toisc gurb é príomhfheidhm na bpíopaí sreabhán a iompar faoi bhrú, is é a dtrastomhas inmheánach an ghné chriticiúil atá acu. Tugtar an tolladh ainmniúil (NB) ar an ngné chriticiúil seo. Ar ndóigh, i gcás píopaí ina bhfuil sreabhán brúite tá tiús an bhalla, agus trí impleacht neart na píopa, tábhachtach. Cuirtear tiús bhalla in iúl i “sceidil“, Dá ngairtear sceidil píopaí. Giorraítear sceideal na bpíopaí marSCH. Maidir le méid agus sceideal ar leith, socraítear agus sainmhínítear tiús na píopa sa chaighdeán ASME is infheidhme. Seachas sceideal na bpíopaí, is féidir tiús na píopa a shonrú immnóorlachleis an luach a fhreagraíonn don luach a shonraítear sa chaighdeán ASME.
Cad iad Méideanna Píopaí a Rialaíonn Caighdeáin?
Is iad na caighdeáin is coitianta sna tionscail ola agus gáis agus tionscail ghaolmhara le sruth
- ASME / ANSI B 36. 10 Píopa Cruach Saoirsithe Táite agus Gan uaim, agus
- ASME / ANSI B 36. 19 Píopa Cruach Dhosmálta
An Athraíonn Sceideal na Píopaí de réir Méid na Píopaí?
Tá an trastomhas lasmuigh fós seasmhach i gcás gach méid píopa. Dá bhrí sin ní bhíonn tionchar ag aon sceideal athraithe ie tiús bhalla ach ar an trastomhas istigh. De réir mar a mhéadaíonn líon an sceidil, méadaíonn tiús an bhalla, agus laghdaítear an tolladh iarbhír.
STDcomhionann leSCH 40le haghaidh NPS 1 / 8 go NPS 1 0, go huile.XScomhionann leSCH 80le haghaidh NPS 1 / 8 go NPS 8, go huile.XXSballa níos tibhe náSCH 160ó NPS 1 / 8 ″ go NPS 6 ″ go huile, agusSCH 160níos tibhe náXXSballa do NPS 8 ″ agus níos mó.
Cairteacha Sceideal Píopaí
Braitheann tiús an bhalla a bhaineann le sceideal áirithe ar mhéid na píopa mar atá le feiceáil ó na cairteacha thíos le haghaidh cuid de na píopaí cruach carbóin meánmhéide is coitianta a bhíonn ann.
Is minic a bhíonn píopa cruach dhosmálta ar fáil i méideanna caighdeánacha meáchain (faoi deara san ainmniúchán “S”, mar shampla “NPS SCH 10 S”). Mar sin féin is féidir píopa cruach dhosmálta a bheith ar fáil i sceidil eile.
Giorrúcháin a úsáidtear:NPS- Méid na Píopa Ainmniúil,NB- Toll ainmniúil,STD- Caighdeán,XS- Breise láidir,XXS- Dúbailte Breise Láidir.
NPS | N.B. | O.D. | 10 | 20 | 30 | STD | 40 | 60 | XS | 80 | 100 | 120 | 140 | 160 | XXS |
1/8 | 6 | 10.3 | 1.24 | – | 1.45 | 1.73 | 1.73 | – | 2.41 | 2.41 | – | – | – | – | – |
1/4 | 8 | 13.7 | 1.65 | – | 1.85 | 2.24 | 2.24 | – | 3.02 | 3.02 | – | – | – | – | – |
3/8 | 10 | 17.1 | 1.65 | – | 1.85 | 2.31 | 2.31 | – | 3.2 | 3.2 | – | – | – | – | – |
1/2 | 15 | 21.34 | 2.11 | – | 2.41 | 2.77 | 2.77 | – | 3.73 | 3.73 | – | – | – | 4.77 | 7.47 |
3/4 | 20 | 26.67 | 2.11 | – | 2.41 | 2.87 | 2.87 | – | 3.91 | 3.91 | – | – | – | 5.56 | 7.82 |
1 | 25 | 33.4 | 2.77 | – | 2.90 | 3.38 | 3.38 | – | 4.55 | 4.55 | – | – | – | 6.35 | 9.09 |
1.1/4 | 32 | 42.16 | 2.77 | – | 2.97 | 3.56 | 3.56 | – | 4.85 | 4.85 | – | – | – | 6.35 | 9.7 |
1.1/2 | 40 | 48.26 | 2.77 | – | 3.18 | 3.68 | 3.68 | – | 5.08 | 5.08 | – | – | – | 7.14 | 10.16 |
2 | 50 | 60.32 | 2.77 | – | 3.18 | 3.91 | 3.91 | – | 5.54 | 5.54 | – | – | – | 8.74 | 11.07 |
2.1/2 | 65 | 73.02 | 3.05 | – | 4.78 | 5.16 | 5.16 | – | 7.01 | 7.01 | – | – | – | 9.52 | 14.02 |
3 | 80 | 88.9 | 3.05 | – | 4.78 | 5.49 | 5.49 | – | 7.62 | 7.62 | – | – | – | 11.12 | 15.24 |
3.1/2 | 90 | 101.6 | 3.05 | – | 4.78 | 5.74 | 5.74 | – | 8.08 | 8.08 | – | – | – | – | 16.15 |
4 | 100 | 114.3 | 3.05 | – | 4.78 | 6.02 | 6.02 | – | 8.56 | 8.56 | – | 11.12 | – | 13.49 | 17.12 |
5 | 125 | 141.3 | 3.40 | – | – | 6.55 | 6.55 | – | 9.52 | 9.52 | – | 12.7 | – | 15.87 | 19.05 |
6 | 150 | 168.3 | 3.40 | – | – | 7.11 | 7.11 | – | 10.97 | 10.97 | – | 14.27 | – | 18.26 | 21.95 |
8 | 200 | 219.1 | 3.76 | 6.35 | 7.04 | 8.18 | 8.18 | 10.31 | 12.7 | 12.7 | 15.08 | 18.26 | 20.63 | 23.01 | 22.22 |
10 | 250 | 273 | 4.19 | 6.35 | 7.80 | 9.27 | 9.27 | 12.7 | 12.7 | 15.08 | 18.26 | 21.44 | 25.4 | 28.57 | 25.4 |
12 | 300 | 323.9 | 4.57 | 6.35 | 8.38 | 9.52 | 10.31 | 14.27 | 12.7 | 17.47 | 21.44 | 25.4 | 28.57 | 33.32 | 25.4 |
14 | 350 | 355.6 | 6.35 | 7.92 | 9.53 | 9.52 | 11.12 | 15.09 | 12.7 | 19.05 | 23.82 | 27.79 | 31.75 | 35.71 | – |
16 | 400 | 406.4 | 6.35 | 7.92 | 9.53 | 9.52 | 12.7 | 16.66 | 12.7 | 21.44 | 26.19 | 30.96 | 36.52 | 40.49 | – |
18 | 450 | 457.2 | 6.35 | 7.92 | 11.13 | 9.52 | 14.27 | 19.05 | 12.7 | 23.82 | 29.36 | 34.92 | 39.67 | 45.24 | – |
20 | 500 | 508 | 6.35 | 9.53 | 12.70 | 9.52 | 15.08 | 20.62 | 12.7 | 26.19 | 32.54 | 38.1 | 44.45 | 50.01 | – |
22 | 550 | 558.8 | 6.35 | 9.53 | 12.70 | 9.52 | 15.87 | 22.22 | 12.7 | 28.57 | 34.92 | 41.27 | 47.62 | 53.97 | – |
24 | 600 | 609.6 | 6.35 | 9.53 | 12.70 | 9.52 | 17.47 | 24.61 | 12.7 | 30.96 | 38.89 | 46.02 | 52.37 | 59.54 | – |
26 | 650 | 660.4 | 7.92 | 12.70 | – | 9.52 | – | – | 12.7 | – | – | – | – | – | – |
28 | 700 | 711.2 | 7.92 | 12.70 | 15.88 | 9.52 | – | – | 12.7 | – | – | – | – | – | – |
30 | 750 | 762 | 7.92 | 12.70 | 15.88 | 9.52 | – | – | 12.7 | – | – | – | – | – | – |
32 | 800 | 812.8 | 7.92 | 12.70 | 15.88 | 9.52 | 17.47 | – | 12.7 | – | – | – | – | – | – |
34 | 850 | 863.6 | 7.92 | 12.70 | 15.88 | 9.52 | 17.47 | – | 12.7 | – | – | – | – | – | – |
36 | 900 | 914.4 | 7.92 | 12.70 | 15.88 | 9.52 | 19.05 | – | 12.7 | – | – | – | – | – | – |
40 | 1000 | 1016 | – | – | – | 9.53 | – | – | 12.7 | – | – | – | – | – | – |
