ASTM B280 Copper Tube for Air Conditioning and Refrigeration (ACR) - Dimensions and Working Pressures
Standard specifications for seamless copper tube used in Air Conditioning and Refrigeration Field Services.
Seamless copper tube according ASTM B280 – Standard Specification for Seamless Copper Tube for Air Conditioning and Refrigeration Field Service - is intended for use in the connection, repairs, or alternations of air conditioning or refrigeration units in the field.
ACR Copper Tubes is used in the Air Conditioning and Refrigeration Field Service Industry and is produced in straight lengths or coils.
Copper tube for air-conditioning and refrigeration field service (ACR) is designated by actual outside diameter.
| Nominal Size (inches) | Annealed (A) or Drawn Temper (D) | Outside Diameter (inches) | Inside Diameter (inches) | Wall Thickness (inches) | Cross Sectional Area of Bore (square inches) |
|---|---|---|---|---|---|
| 1/8 | A | 0.125 | 0.065 | 0.030 | 0.0033 |
| 3/16 | A | 0.187 | 0.128 | 0.030 | 0.0129 |
| 1/4 | A | 0.250 | 0.190 | 0.030 | 0.0284 |
| 5/16 | A | 0.312 | 0.248 | 0.032 | 0.0483 |
| 3/8 | A | 0.375 | 0.311 | 0.032 | 0.076 |
| D | 0.375 | 0.315 | 0.030 | 0.078 | |
| 1/2 | A | 0.500 | 0.436 | 0.032 | 0.149 |
| D | 0.500 | 0.430 | 0.035 | 0.145 | |
| 5/8 | A | 0.625 | 0.555 | 0.035 | 0.242 |
| D | 0.625 | 0.545 | 0.040 | 0.233 | |
| 3/4 | A | 0.750 | 0.680 | 0.035 | 0.363 |
| A | 0.750 | 0.666 | 0.042 | 0.348 | |
| D | 0.750 | 0.666 | 0.042 | 0.348 | |
| 7/8 | A | 0.875 | 0.785 | 0.045 | 0.484 |
| D | 0.875 | 0.785 | 0.045 | 0.484 | |
| 1 1/8 | A | 1.125 | 1.025 | 0.050 | 0.825 |
| D | 1.125 | 1.025 | 0.050 | 0.825 | |
| 1 3/8 | A | 1.375 | 1.265 | 0.055 | 1.26 |
| D | 1.375 | 1.265 | 0.055 | 1.26 |
Temper describes the strength and hardness of the tube.
- drawn temper - also called "hard" or "rigid"
- annealed temper - also called "soft" or "flexible"
Working Pressures
| Nominal Size (inches) | Max. Working Pressure (psi) | ||
|---|---|---|---|
| Annealed Coils | Annealed Straight Lengths | Drawn Straight Lengths | |
| 1/8 | 2613 | ||
| 3/16 | 1645 | ||
| 1/4 | 1195 | ||
| 5/19 | 1017 | ||
| 3/8 | 836 | 777 | 1524 |
| 1/2 | 618 | 664 | 1302 |
| 5/8 | 525 | 615 | 1206 |
| 3/4 | 435 | 538 | 1055 |
| 7/8 | 495 | 496 | 972 |
| 1 1/8 | 420 | 421 | 825 |
| 1 3/8 | 373 | 374 | 733 |
| 1 5/8 | 347 | 348 | 682 |
| 2 1/8 | 309 | 607 | |
| 2 5/8 | 286 | 560 | |
| 3 1/8 | 270 | 529 | |
| 3 5/8 | 258 | 506 | |
| 4 1/8 | 249 | 489 | |
Ratings based on service temperature max. 150 oF (66 oC).
- yield strength S = 5100 psi (35 GPa) for annealed tube
- yield strength S = 10000 psi (69GPa) for drawn tube
