Hetrick Mfg. is a Pittsburgh PA. located custom shell & tube heat exchanger shop that thermally rates, mechanically designs & fabricates custom shell & tube heat exchangers and ASME code pressure vessels. In business since 1974. We have over 60 weld procedures and all our welders are ASME Section IX certified. Hetrick Mfg., Inc. is ASME Section VIII Div. I certified with NB, U & R Stamps.