ASTM A269 ke tekanyetso e tloaelehileng bakeng sa li-tubing tsa tšepe tse se nang moroallo le tse cheselitsoeng bakeng sa lits'ebeletso tse thibelang kutu le tse tlase kapa tsa mocheso o phahameng. boiler, superheater, le li-tubes tsa ho fapanyetsana mocheso.Phapang pakeng tsa A269, A249, le A213 e itšetlehile ka litekanyetso tse khethehileng tseo li li emelang bakeng sa li-tubing tsa tšepe e sa hloekang.
MAEMO A ASTMA249 ASTM A269 ASTMA270 ASTM213
| Standard | Mamello ea Kantle Diameter (mm) | Botenya ba lebota (%) | Mamello ea Bolelele(mm) | ||
| ASTM A249 | <25.0 | +0,10 -0,11 | ±10% | ||
| ≥25.0-≤40.0 | ±0.15 | ||||
| >40.0-<50.0 | ±0.20 | OD <50.8 | +3.0-0.0 | ||
| ≥50.0~<65.0 | ±0.25 | ||||
| ≥65.0-<75.0 | ±0.30 | ||||
| ≥75.0~<100.0 | ±0.38 | OD≥50.8 | +5.0-0.0 | ||
| ≥100~≤200.0 | +0,38 -0,64 | ||||
| >200.0-≤225.0 | +0,38 -1,14 | ||||
| ASTM A269 | <38.1 | ±0.13 | |||
| ≥38.1~<88.9 | ±0.25 | ||||
| ≥88.9-<139.7 | ±0.38 | ±15.0% | OD <38.1 | +3.2-0.0 | |
| ≥139.7~<203.2 | ± 0.76 | ±10.0% | 0D ≥38.1 | +4.0-0.0 | |
| ≥203.2-<304.8 | ±1.01 | ||||
| ≥304.8-<355.6 | ± 1.26 | ||||
| ASTMA270 | ≤25.4 | ±0.13 | ±10% | +10-0.0 | |
| >25.4-≤50.8 | ±0.20 | ||||
| >50.8~≤62 | ±0.25 | ||||
| > 76.2- ≤101.6 | ±0.38 | ||||
| >101.6~<139.7 | ±0.38 | ||||
| ≥139.7–203.2 | ± 0.76 | ||||
| ≥203 2~≤304.8 | ±1.27 | ||||
| ASTM213 | D＜25.4 | ± 0.10 | +20/0 | +3.0/0 | |
| 25.4~38.1 | ±0.15 | ||||
| 38.1~50.8 | ±0.20 | ||||
| 50.8~63.5 | ±0.25 | +22/0 | +5.0/0 | ||
| 63.5~76.2 | ±0.30 | ||||
| 76.2~101.6 | ±0.38 | ||||
| 101.6~190.5 | +0,38/-0,64 | ||||
| 190.5 ~ 228.6 | +0.38/-1.14 | ||||
Nako ea poso: Jun-27-2023