TUBING DATA
TABLE 3: TEMPERATURE DERATING FACTORS
| Temperature | Tubing Materials | ||
| °F | °C | Stainless Steels | Copper |
| 100 | 38 | 1.00 | 1.00 |
| 200 | 93 | 1.00 | 0.80 |
| 300 | 149 | 1.00 | 0.78 |
| 400 | 204 | 0.96 | 0.50 |
| 500 | 260 | 0.90 | – |
| 600 | 315 | 0.85 | – |
| 700 | 371 | 0.82 | – |
| 800 | 426 | 0.79 | – |
| 900 | 482 | 0.78 | – |
| 1000 | 537 | 0.76 | – |
| 1100 | 593 | 0.62 | – |
| 1200 | 649 | 0.37 | – |
- To determine allowable pressure at higher temperature, multiply allowable working pressure from Table1, 2 by factors shown in Table
- For Example
- Stainless steel tubing 1/2″ D. X 0.049″ wall at 800°F(426°C)
- The elevated temperature factor for 800°F(426°C) is 79 (3,750psig X 0.79 = 2,962psig)
TABLE 4: GAS ALLOWABLE TUBING
| Stainless Steel Tubing | Copper Tubing | ||||||||
| Metric | Fractional | Metric | Fractional | ||||||
| Tube O.D. | Min. Nominal Wall Thickness | Tube O.D. | Min. Nominal Wall Thickness | Tube O.D. | Min. Nominal Wall Thickness | Tube O.D. | Min. Nominal Wall Thickness | ||
| Mm | INCH | mm | Mm | INCH | mm | ||||
| 3 | 0.8 | 1/8″ | 0.028 | 0.71 | 8 | 1.0 | 1/8″ | 0.028 | 0.71 |
| 6 | 0.8 | 3/16″ | 0.028 | 0.71 | 10 | 1.0 | 3/16″ | 0.028 | 0.71 |
| 8 | 1.0 | 1/4″ | 0.028 | 0.71 | 12 | 1.0 | 1/4″ | 0.028 | 0.71 |
| 10 | 1.0 | 5/16″ | 0.035 | 0.89 | 14 | 1.2 | 5/16″ | 0.035 | 0.89 |
| 12 | 1.0 | 3/8″ | 0.035 | 0.89 | 16 | 1.2 | 3/8″ | 0.035 | 0.89 |
| 14 | 1.2 | 1/2″ | 0.049 | 1.24 | 18 | 1.5 | 1/2″ | 0.049 | 1.24 |
| 16 | 1.5 | 5/8″ | 0.065 | 1.65 | 20 | 1.8 | 5/8″ | 0.065 | 1.65 |
| 18 | 1.5 | 3/4″ | 0.065 | 1.65 | 22 | 2.0 | 3/4″ | 0.065 | 1.65 |
| 20 | 1.8 | 7/8″ | 0.083 | 2.11 | 25 | 2.2 | 7/8″ | 0.083 | 2.11 |
| 22 | 2.0 | 1″ | 0.083 | 2.11 | 28 | 2.5 | 1″ | 0.083 | 2.11 |
| 25 | 2.2 | 1 1/4″ | 0.109 | 2.77 | |||||
| 28 | 2.5 | 1 1/2″ | 0.134 | 3.40 | |||||
| 32 | 3.0 | 2″ | 0.188 | 4.78 | |||||
| 38 | 3.5 | ||||||||
- For Gas applications, we recommend tubing with a greater wall
- Table 4 shows the recommended min
- Wall thicknesses for greater safety and efficiency
Note!
- The value of Table 1, Table 2 are maximum allowable working pressure calculated from the tube The maximum allowable working pressure of the fitting is limited from the value of this table according to the application regulations, and use it, please after considering the application regulations and the standard of used equipment.
- There is a possibility that the seal decreases remarkably, and consult separately, please when it is used for a long time exceeding 400°C.