Regarding the issue of the support height for floating-head heat exchangers
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According to the standard height of floating-head heat exchanger supports, this height is usually about 5 mm shorter than the distance between the sealing surfaces of the lower pipe flanges on the shell and the tube sheet. As a result, the heat exchanger support cannot come into direct contact with the ground; instead, it is the pipe sealing surfaces that make contact with the ground, which is very inconvenient. During transportation and storage, shims must be used to raise the bottom plate of the support, otherwise the flange sealing surfaces are likely to get damaged. It is proposed to modify the standard by increasing the distance between the support base plate and the lower part of the housing by approximately 10–20 mm.
The dimensions specified in the standards take extreme overlap situations into account, and individual floating-head heat exchangers are not required to follow them. Except for the models specified by the user, as the manufacturer is likely to be unaware whether they are intended for overlap.
It sometimes happens that the flange surface is higher than the saddle surface; in such cases, we usually place something under the saddle. We generally follow the customer’s requirements
:o Why is the support height of floating-head heat exchangers a standard value?
The connection of overlapping heat exchangers is the main consideration
It is quite common for the flange height to be higher than that of the saddle, especially in high-heat-exchange heaters; during transportation, the saddle can be raised.