I don't really believe you since I have a lot of experience in the industry.
TEMA - Tubular Exchanger Manufacturers Association
It's a Association, not a manufacturer. You have to source from established companies.
What make were the pumps ?
Check TEMA India Ltd in Mumbai. It is an ASME VIII certified body, but I sent some engineers there and they said it was like a countryside workshop in Vietnam. Worshop looks dirty and chaotic.
I don't see India can reach China quality in next 1000 years. You have to change your culture. It is not a matter of applying some useless ISO certificate or TQM.