Problem of the diameter of the tube layout constraint circle for HTRI Xhpe clip-on heat exchangers
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Hello everyone! I would like to ask: when using the HTRI Xhpe module to calculate clip-type heat exchangers, if the \"Bundle-to-shell\" value is not specified by default, the diameter of the pipe layout constraint turns out to be very small. For example, when the Shell ID is 1000, the Actual OTL is 882.7; when it is 600, it is 531.5. These values differ significantly from those specified in GB 151. What could be the reason? Is it due to the special structure of the clip-type heat exchanger? If the tail elbow is in the form of a non-removable U-shaped elbow, can this gap be adjusted to the standard value?
There is no standard for clip-type national standards. For extractable clips, the thickness of the fixed-end tube box needs to be taken into account, so OTL will be slightly smaller ； For fixed, non-bendable elbow types, the values specified in national standards can be used as a reference; it is advisable to account for an additional 5 mm or so to protect the U-tube with welding gaskets during fabrication.
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