For the design of saddles for horizontal vessels with high operating temperatures
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The standards for saddles require that the design temperature not exceed 200°C; currently, there is a horizontal vessel whose design temperature reaches 400°C. What issues should be taken into consideration in the design of such saddles? Are there any relevant materials available on this topic?
If this device is insulated, the saddle can be divided into two parts: the part covered by the insulation layer can be made from the same material as the main body, while the part that is not covered can be made of ordinary carbon steel. If insulation is not provided, it is recommended that the saddle reinforcement plates be made of the same material as the main structure, following the standard design for saddles; as long as the calculations for the saddle are satisfactory, that will suffice ； You can also consult the equipment and process engineers to find out what the actual temperature of the saddle is; it is likely to be no more than 200°C, so normal design practices should suffice. I consulted an expert on this issue, and that’s what he replied.
The part covered by the insulation layer? The backing plate is definitely covered with insulation, as are parts of the gusset plates and web plates; only the bottom plate is not covered. Is everything except the base plate made of the same material as the device?
At high temperatures, for stress calculations, the allowable stress should decrease