Selection of the hook ring type for floating-head heat exchangers
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According to the heat exchanger standard GB151, floating-head heat exchangers come in two types of hook rings: Type A and Type B. Upon comparison, Type B has many advantages, while Type A has only the advantage of lower processing requirements. Questions: 1. How should one choose between the two types of hook rings? What are the selection principles? 2. If everyone chooses Type B due to its many advantages, then why is Type A still included in the standards? Moreover, why is the Type A structure still retained in the new version of GB/T151-2014? Could any expert provide a convincing explanation? Thank you. The attached figure shows a comparison of the two types of hook loops as defined in the GB/T151-2014 standard
Type B saves material and is easy to assemble; we use it all the time
Hehe, for small diameters, type A is still used more often
Why is small diameter used so often? What’s the reason? What general diameter is suitable for type A?