When designing metal hose assemblies the pressure rating of the assembly is directly affected by the temperature the hose will be subjected too. If the design pressure is working at a temperature above ambient then the following temperature correction factors should be applied to work out the true pressure rating the hose should be designed to withstand.
For example if a 316L hose works at 20 bar at 300 deg C the actual rating of the flex should be designed to withstand 37 bar. This is worked out by applying the following calculation DP / 0.54(correction factor from table below) = 37 bar.
The hose would need to be designed to withstand 37 bar and not the 20 bar indicated.
Source: EN10380: 2012 – Derating factors and limiting temperature for European materials | ||||||||||||||||
Temperature °C
Material |
20 | 50 | 100 | 150 | 200 | 250 | 300 | 350 | 400 | 450 | 500 | 550 | 600 | 650 | ||
1.4306-304L | 1 | 0.87 | 0.72 | 0.65 | 0.59 | 0.55 | 0.51 | 0.48 | 0.46 | 0.45 | 0.44 | 0.43 | / | / | ||
1.4301-304 | 1 | 0.88 | 0.73 | 0.66 | 0.60 | 0.56 | 0.52 | 0.50 | 0.48 | 0.47 | 0.46 | 0.42 | / | / | ||
1.4541-321 | 1 | 0.92 | 0.83 | 0.78 | 0.74 | 0.71 | 0.67 | 0.64 | 0.62 | 0.61 | 0.60 | 0.59 | / | / | ||
1.4404-316L | 1 | 0.88 | 0.74 | 0.67 | 0.62 | 0.58 | 0.54 | 0.52 | 0.50 | 0.48 | 0.47 | 0.47 | / | / | ||
1.4401-316 | 1 | 0.90 | 0.78 | 0.71 | 0.66 | 0.62 | 0.58 | 0.56 | 0.53 | 0.52 | 0.51 | 0.51 | / | / | ||
1.4571-316Ti | 1 | 0.90 | 0.81 | 0.76 | 0.73 | 0.69 | 0.65 | 0.63 | 0.61 | 0.59 | 0.59 | 0.58 | / | / | ||
2.4856-Inconel 625 |
1 | 0.95 | 0.88 | 0.84 | 0.80 | 0.78 | 0.75 | 0.73 | 0.70 | 0.68 | 0.65 | 0.64 | 0.63 | 0.50 | ||
Note 1: The derating factor to be applied to low temperatures for some of the austenitic materials listed is higher than 1. For further information, contact the manufacturer. | ||||||||||||||||
Note 2: Stainless steel designations and values are specified in EN 10028-7 for 1% proof strength (C product form); carbon steel designations and values are specified in EN 10028-2 and nickel alloy designations are specified in EN 10095. | ||||||||||||||||