ASTM A789 txujspecification npog cov qib ntawm nominal phab ntsa thickness, stainless hlau tubing rau cov kev pab cuam uas yuav tsum tau ib tug dav corrosion kuj, tshwj xeeb tshaj yog tseem ceeb rau tsis kam mus rau kev nyuaj siab corrosion cracking. Cov hlau no muaj kev cuam tshuam rau embrittlement yog tias siv rau lub sijhawm ntev ntawm qhov kub siab.
ASME B36.19 Qhov ntau thiab tsawgthiab Dimensions Standard
| NPS nominal yeeb nkab loj | Sab nraud txoj kab uas hla | Cov Txheej Txheem Yeeb Nkab | ||||
| DN | NPS (hauv) | OD (mm) | Sch5S hauv (mm) |
Sch10S hauv (mm) |
Sch40 S hauv (mm) |
Sch80S hauv (mm) |
| 6 | 1/8 | 3.175 | … | 0.049(1.24) | 0.068(1.73) | 0.095(2.41) |
| 8 | 1/4 | 6.35 | … | 0.065(1.65) | 0.088(2.24) | 0.119(3.02) |
| 10 | 3/8 | 9.53 | … | 0.065(1.65) | 0.091(2.31) | 0.126(3.2) |
| 15 | 1/2 | 12.70 | 0.065(1.65) | 0.083(2.11) | 0.109(2.77) | 0.147(3.73) |
| 20 | 3/4 | 19.05 | 0.065(1.65) | 0.083(2.11) | 0.113(2.87) | 0.154(3.91) |
| 25 | 1 | 25.40 | 0.065(1.65) | 0.109(2.77) | 0.133(3.38) | 0.179(4.55) |
| 32 | 1 1/4 | 31.75 | 0.065(1.65) | 0.109(2.77) | 0.14(3.56) | 0.191(4.85) |
| 40 | 1 1/2 | 38.10 | 0.065(1.65) | 0.109(2.77) | 0.145(3.68) | 0.2(5.08) |
| 50 | 2 | 50.80 | 0.065(1.65) | 0.109(2.77) | 0.154(3.91) | 0.218(5.54) |
| 65 | 2 1/2 | 63.50 | 0.083(2.11) | 0.12(3.05) | 0.203(5.16) | 0.276(7.01) |
| 80 | 3 | 76.20 | 0.083(2.11) | 0.12(3.05) | 0.216(5.49) | 0.3(7.62) |
| 90 | 3 1/2 | 88.90 | 0.083(2.11) | 0.12(3.05) | 0.226(5.74) | 0.318(8.08) |
| 100 | 4 | 101.60 | 0.083(2.11) | 0.12(3.05) | 0.237(6.02) | 0.337(8.56) |
| 125 | 5 | 127.00 | 0.109(2.77) | 0.134(3.4) | 0.258(6.55) | 0.375(9.53) |
| 137.5 | 5 1/2 | 139.70 | 0.109(2.77) | 0.134(3.4) | 0.269(6.83) | 0.403(10.25) |
| 150 | 6 | 152.40 | 0.109(2.77) | 0.134(3.4) | 0.28(7.11) | 0.432(10.97) |
| 200 | 8 | 203.20 | 0.109(2.77) | 0.148(3.76) | 0.322(8.18) | 0.5(12.7) |
ASME SA789 Permissible Variations In Dimensions
| Pab pawg | Loj, sab nraud Txoj kab uas hla, hauv. |
Permissible Variations nyob rau hauv Sab nraud Dia, in. |
Tso cai Variations nyob rau hauv phab ntsa |
Permissible Variations in Cut Length, hauv.B [mm] |
- | |
| [mm] | [mm] | Thickness, A% | Tshaj | Hauv qab | Thin Walled TubesC | |
| 1 | Up to¹/₂ [12.7], exc | ±0.005 [0.13] | ±15 | ¹/8[3] | 0 | ... |
| 2 | ¹/₂ to 1¹/₂ [12.7 to 38.1], exc | ±0.005 [0.13] | ±10 | ¹/8 [3] | 0 | tsawg dua 0.065 hauv [1.6 mm] npe |
| 3 | l¹/₂ to 3¹/₂ [38.1 to 88.9], exc | ±0.010 [0.25] | ±10 | 3/₁₆ [5] | 0 | tsawg dua 0.095 hauv [2.4 mm] npe |
| 4 | 3¹/₂ to 5¹/₂ [88.9 to 139.7], exc | ±0.015 [0.38] | ±10 | 3/₁₆ [5] | 0 | tsawg dua 0.150 hauv [3.8 mm] npe |
| 5 | 5¹/₂ to 8[139.7 to 203.2], incl | ±0.030 [0.76] | ±10 | 3/₁₆ [5] | 0 | tsawg dua 0.150 hauv [3.8 mm] npe |
Nco tseg:
A Thaum cov raj raws li kev txiav txim yuav tsum muaj phab ntsa thicknesses 34 nyob rau hauv. [19 mm] los yog tshaj, los yog ib sab hauv txoj kab uas hla 60% los yog tsawg dua ntawm sab nraud txoj kab uas hla, yuav tsum tau ib tug dav variation ntawm phab ntsa thickness. Ntawm qhov ntau thiab tsawg qhov txawv ntawm phab ntsa thickness ntawm 12.5% tshaj lossis qis dua yuav tso cai. Fortubes tsawg dua nyob rau hauv.[12.7 mm] nyob rau hauv txoj kab uas hla uas tsis tuaj yeem ua tau zoo kos hla lub mandrel, phab ntsa thickness yuav txawv ± 15% ntawm qhov tau teev tseg.
B Cov kev kam rau siab no siv rau kev txiav ntev mus txog thiab suav nrog 24 ft [7.3 m]. Rau qhov ntev ntau dua 24 ft [7.3 m], qhov siab tshaj qhov siab yuav tsum tau nce los ntawm [3 mm] rau txhua 10 ft [3 m] lossis feem ntawm qhov siab tshaj 24 ft lossis hauv [13 mm], qhov twg yog qhov tsawg dua.
C Ovality cov kev cai ntawm 12.2 siv
FAQ
Q: Tus qauv phab ntsa thickness kam rau ua rau ASTM A789 yog dab tsi?
A: Rau feem ntau qhov ntau thiab tsawg (1/2 "rau 5" OD), phab ntsa thickness kam rau ua±10%. Rau me me - txoj kab uas hla tubing (hauv qab 1/2 "), qhov kam rau ua dav dav rau±15%.
Q: ASTM A789 Tubing puas tuaj yeem siv rau cov kav dej siab?
A: ASTM A789 tshwj xeeb yog atubing txheem, feem ntau yog siv rau cov cua kub exchangers thiab condensers. Yog tias koj qhov project xav tau qhov ntau thiab tsawg ntawm cov yeeb nkab nominal (NPS) rau cov txheej txheem piping, koj yuav tsum xa mus rauASTM A790 Cov Lus Qhia Tshwj Xeeb.
Q: Puas yog ASTM A789 npog cov qib Super Duplex?
A: Yog. Thaum S31803 thiab S32205 (Duplex 2205) yog qhov ntau tshaj, A789 tseem suav nrog Super Duplex qib zoo liS32750thiabS32760.
Q: Dab tsi yog qhov yuav tsum tau xeem rau ASTM A789 ua raws?
A: Txhua lub raj yuav tsum raug kuaj nruj, kev sim flaring (rau seamless), kev sim flattening (rau welded), thiab tsis yog -kev ntsuas hluav taws xob puas (Eddy Current) lossis hydrostatic test.
Q: Puas muaj kev txwv hardness rau A789 Duplex tubing?
A: Yog. Piv txwv li, S31803 muaj qhov siab tshaj plaws hardness ntawm30 HRC(Rockwell C) los yog290 HWB(Brinell). Tshaj cov kev txwv no tuaj yeem ua rau muaj kev pheej hmoo ntawm kev ntxhov siab corrosion cracking.
