Meintiau a Dimensiynau Pibell ASTM A312
Maint Pibell ASTM A312yn seiliedig ar y Safon Genedlaethol Americanaidd ar gyfer pibell ddur di-staen (ANSI B36.19). Mae ASTM A312 yn cwmpasu meintiau sy'n amrywio o 1/8" i 30" a thrwch wal o STD i XXS. Mae hefyd yn cynnwys dimensiynau safonol ar gyfer pibellau weldio a di-dor, sy'n bwysig ar gyfer cyfnewidioldeb hawdd a chydnawsedd.
| Dynodwr yr NPS | Diamedr y tu allan | Trwch Wal Enwol | ||||||||
| Atodlen 5SA | Atodlen 10SA | Atodlen 40S | Atodlen 80S | |||||||
| mewn. | Mm | mewn. | Mm | mewn. | Mm | mewn. | Mm | mewn. | Mm | |
| 1/8 | 0.405 | 10.29 | … | … | 0.049 | 1.24 | 0.068 | 1.73 | 0.095 | 2.41 |
| 1/4 | 0.540 | 13.72 | … | … | 0.065 | 1.65 | 0.088 | 2.24 | 0.119 | 3.02 |
| 3/8 | 0.675 | 17.15 | … | … | 0.065 | 1.65 | 0.091 | 2.31 | 0.126 | 3.20 |
| 1/2 | 0.840 | 21.34 | 0.065 | 1.65 | 0.083 | 2.11 | 0.109 | 2.77 | 0.147 | 3.73 |
| 3/4 | 1.050 | 26.67 | 0.065 | 1.65 | 0.083 | 2.11 | 0.113 | 2.87 | 0.514 | 3.91 |
| 1 | 1.315 | 33.40 | 0.065 | 1.65 | 0.109 | 2.77 | 0.133 | 3.38 | 0.179 | 4.55 |
| 1 1/4 | 1.660 | 42.16 | 0.065 | 1.65 | 0.109 | 2.77 | 0.140 | 3.56 | 0.191 | 4.85 |
| 1 1/2 | 1.900 | 48.26 | 0.065 | 1.65 | 0.109 | 2.77 | 0.145 | 3.68 | 0.200 | 5.08 |
| 2 | 2.375 | 60.33 | 0.065 | 1.65 | 0.109 | 2.77 | 0.154 | 3.91 | 0.218 | 5.54 |
| 2 1/2 | 2.875 | 73.03 | 0.083 | 2.11 | 0.120 | 3.05 | 0.203 | 5.16 | 0.276 | 7.01 |
| 3 | 3.500 | 88.90 | 0.083 | 2.11 | 0.120 | 3.05 | 0.216 | 5.49 | 0.300 | 7.62 |
| 3 1/2 | 4.000 | 101.60 | 0.083 | 2.11 | 0.120 | 3.05 | 0.226 | 5.74 | 0.318 | 8.08 |
| 4 | 4.500 | 114.30 | 0.083 | 2.11 | 0.120 | 3.05 | 0.237 | 6.02 | 0.337 | 8.56 |
| 5 | 5.563 | 141.30 | 0.109 | 2.77 | 0.134 | 3.40 | 0.258 | 6.55 | 0.375 | 9.52 |
| 6 | 6.625 | 168.28 | 0.109 | 2.77 | 0.134 | 3.40 | 0.280 | 7.11 | 0.432 | 10.97 |
| 8 | 8.625 | 219.08 | 0.109 | 2.77 | 0.148 | 3.76 | 0.322 | 8.18 | 0.500 | 12.70 |
| 10 | 10.750 | 273.05 | 0.134 | 3.40 | 0.165 | 4.19 | 0.365 | 9.27 | 0.500B | 12.70B |
| 12 | 12.750 | 323.85 | 0.156 | 3.96 | 0.180 | 4.57 | 0.375B | 9.52B | 0.500B | 12.70B |
| 14 | 14.000 | 355.60 | 0.156 | 3.96 | 0.188B | 4.78B | … | … | … | … |
| 16 | 16.000 | 406.40 | 0.165 | 4.19 | 0.188B | 4.78B | … | … | … | … |
| 18 | 18.000 | 457.20 | 0.165 | 4.19 | 0.188B | 4.78B | … | … | … | … |
| 20 | 20.000 | 508.00 | 0.188 | 4.78 | 0.218B | 5.54B | … | … | … | … |
| 22 | 22.000 | 558.80 | 0.188 | 4.78 | 0.218B | 5.54B | … | … | … | … |
| 24 | 24.000 | 609.60 | 0.218 | 5.54 | 0.250 | 6.35 | … | … | … | … |
| 30 | 30.000 | 762.00 | 0.250 | 6.35 | 0.312 | 7.92 | … | … | … | … |
Pibell Dur Di-staen ASTM A312Amrywiadau a Ganiateir mewn Trwch Waliau
ASTM A312aASME SA312darparu rheoliadau ar faint safonol a goddefiannau pibellau dur di-staen di-dor a weldio ar gyfer gwasanaethau cyrydol tymheredd uchel a chyffredinol.
Yn ychwanegol at y cyfyngiad ymhlyg ar drwch wal neu bibell ddi-dor a osodir gan y cyfyngiad ar bwysau ym manyleb A 999/A 999M. Rhaid i drwch y wal ar gyfer pibell di-dor a weldio ar unrhyw adeg fod o fewn y goddefiannau a nodir yn y Tabl canlynol, ac eithrio ar gyfer pibell weldio ni fydd yr ardal weldio yn cael ei chyfyngu gan y goddefgarwch "Gor". Dangosir trwch y wal a'r diamedr allanol i'w harchwilio ar gyfer cydymffurfio â'r gofyniad hwn am bibell a archebir gan NPS a rhif atodlen ynANSI B36.19.
| Dynodwr yr NPS | Goddefgarwch, % o Enwol | |
| Drosodd | Dan | |
| 1/8 i 21/2 gan gynnwys, pob cymarebau t/D | 20.0 | 12.5 |
| 3 i 18 gan gynnwys, t/D hyd at 5% gan gynnwys. | 22.5 | 12.5 |
| 3 i 18 gan gynnwys, t/D > 5 % | 15.0 | 12.5 |
| 20 a mwy, wedi'u weldio, pob cymarebau t/D | 17.5 | 12.5 |
| 20 a mwy, di-dor, t/D hyd at 5% gan gynnwys. | 22.5 | 12.5 |
| 20 a mwy, di-dor, t/D > 5 % | 15.0 | 12.5 |
t=Trwch Wal Enwol
D=Archebwyd y Tu Allan i'r Diamedr
