Page 34 - CorrugatedCatalog110913Rev8LR

Temperature Derating
33
To calculate a working pressure derated for elevated temperature, you must frst obtain the derat-
ing factors for all of the assembly components (i.e. hose, braid, fttings, etc.) from the following
chart. Multiply the hose working pressure shown in the catalog by the lowest rating obtained below
to determine the derated working pressure. Note: The working pressure of an assembly at elevated
temperatures may be affected by ftting type, material, and method of attachment.
Working Pressure Derating Factor
Temp. in
Degrees F
T304
T301* T304L T316 T316L T321 C276
Monel
400 &
C22
Inconel
600
Inconel
625
Carbon
Steel**
Alum.
3003
H14
Bronze Copper
70 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00
100 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 0.97 1.00
200 1.00 1.00 1.00 1.00 1.00 1.00 0.88 1.00 1.00 1.00 1.00 0.89 0.80
300 1.00 1.00 1.00 1.00 1.00 1.00 0.82 1.00 1.00 1.00 0.64 0.83 0.78
400 0.94 0.93 0.97 0.93 1.00 1.00 0.79 1.00 1.00 1.00 0.34 0.78 0.50
500 0.88 0.86 0.90 0.86 0.96 0.99 0.79 1.00 0.97 0.95 0.13
600 0.82 0.81 0.85 0.81 0.91 0.93 0.79 1.00 0.95 0.87
650 0.81 0.79 0.84 0.79 0.89 0.90 0.79 1.00 0.94 0.85
700 0.80 0.77 0.82 0.77 0.87 0.88 0.79 1.00 0.93 0.83
750 0.78 0.75 0.81 0.75 0.86 0.86 0.79 1.00 0.93 0.65
800 0.76 0.74 0.80 0.74 0.84 0.84 0.79 1.00 0.93 0.54
850 0.75 0.72 0.79 0.72 0.84 0.83 0.79 0.99 0.93 0.44
900 0.73 0.71 0.78 0.71 0.83 0.82 0.76 0.95 0.93 0.33
950 0.72 0.69 0.77 0.69 0.81 0.81 0.71 0.95 0.93 0.23
1000 0.69 0.67 0.77 0.67 0.81 0.80 0.48 0.42 0.93
1050 0.61 0.65 0.73 0.65 0.70 0.68 0.27 0.93
1100 0.49 0.62 0.62 0.61 0.55 0.55 0.20 0.69
1150 0.39 0.53 0.49 0.52 0.41 0.47 0.57
1200 0.30 0.38 0.37 0.38 0.32 0.36 0.36
1250 0.24 0.28 0.28 0.28 0.25 0.29
1300 0.21 0.21 0.21
When gas or liquid being conveyed in a corrugated metal hose exceeds certain limits, resonant
vibration can occur. Resonance may cause very rapid failure of the assembly. In those applications where
product velocities exceed the limits shown in the chart below, a revision of the assembly design might include:
1. Addition of an interlocked metal hose liner
2. An increase in the corrugated hose I.D.
3. A combination of the above
Velocity in Metal Hose
Installation
Confguration
Maximum Product Velocity (Feet/Second)
Unbraided Braided
Dry Gas Liquid Dry Gas Liquid
Straight Run 100 50 150 75
45 Degree Bend 75 40 115 60
90 Degree Bend 50 25 75 40
180 Degree Bend 25 12 38 19
Velocity
800 - 221 - 2319 • www. hosemas t e r. com
* T301 is not listed in B31.1, but its tensile and yields are identical to T304 per ASM Metals Reference book 3rd Ed. Page 364
**Do not use for temperatures lower than 32°F