By the way, how do you determine the design temperature for saddle supports?
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Case 1): Design temperature of the tank is 160°C, with a monthly average temperature of 5°C. Case 2): Design temperature of the tank is 360°C, with a monthly average temperature of 5°C. Case 3): Design temperature of the tank is 160°C, with a monthly average temperature of -5°C. I’m not sure how to determine these values, so I’d like to discuss it with everyone. How do people usually handle it? Is insulation material also added to the supports?
Previously, the design temperature for the saddle was set at the design temperature of the equipment; usually, no insulation is used, but there have been cases where customers requested that the saddle also be insulated. You can take a look at NB/T 47042; it contains calculations for saddles.
As a supplementary note, the standard saddle in 4712.1 is determined based on a design temperature of 200°C; when I was performing the ASME design, there was no option for a design temperature for the saddle.
NBT 47042-2014 \"Horizontal Vessels\" 5.4.1b) The design temperature of the saddle should be determined by taking into account both the design temperature of the vessel and the ambient temperature. The standards only set out principle-based requirements; as long as the designer can justify their approach, they can proceed in whatever way they choose. :Lol, the design temperature affects two main things: one is the allowable stress, and the other is the requirements regarding low-temperature impact. It is usually difficult to accurately calculate the metal wall temperature of the saddle, so a conservative approach has to be adopted. The high temperature of the saddle comes from the housing. In terms of strength calculation, determining the allowable stress of the saddle material based on the design temperature of the shell (the upper temperature limit) generally does not increase the cost of the equipment. The impact of ambient temperature mainly lies in whether low-temperature impact requirements need to be imposed on the saddle material. The design temperature for the low-temperature section of the tower skirt is generally taken as the lowest value of the local monthly average minimum temperature plus 20°C (this is an empirical value; I can’t recall where it comes from), and the same principle applies to skirts without insulation as well. If insulation is required for the saddle, there is no need to consider low-temperature shock.
Yes, so I think as long as the designed operating temperature of the equipment does not exceed 200 degrees Celsius, it should be safe. When designing a standard saddle, the temperature should be considered to be 200, in my opinion
If the design temperature of the housing exceeds 200°C, the bearing pad will also exceed 200°C. How should the allowable stress of the pad be determined? Is it allowed to use an allowable stress above 200°C? What criteria should be used to select the allowable stress? The standard is only below 200°C.
The tank should be insulated; in this way, the temperature at the junction between the saddle and the tank body will differ from the temperature of the saddle’s base plate. This can be calculated using finite element software, taking into account heat transfer by convection between the flat surface and the air； The connection to the cylinder can be considered based on the cylinder temperature.
Who will answer the question from floor 6? ? Thank you so much!