By which codes, the design and construction of Shell and Tube heat exchanger is governed?

Mechanical standards for shell-and-tube heat exchangers are set by TEMA (Tubular Exchangers Manufacturers Association) and these supplement the ASME code for such heat exchangers. API (American Petroleum Institute) Standard 660 supplements both of these standards, and chemical and petroleum companies also have their own internal standards in addition.

1. ASME Section8 Divission1 &2
2. TEMA (Tubular Exchanger Manufacturers Association)

TEMA and ASME Sec.VIII Div. I

The design and construction of shell and tube heat exchanger is governed by TEMA and ASME