Hetrick Mfg., Inc. thermally rates, mechanically designs and fabricates custom shell & tube heat exchangers and ASME Code vessels. Our stamps are ASME U and R (Section VIII, Div. I) and all of our welders are Certified ASME Section IX. We have over 60 weld procedures and commonly re-tube, repair and replace heat exchangers. The materials we work with include carbon and stainless steel, Cr-Mo, Lo-Temp, Duplex, Super Duplex, Hastelloy, Inconel, Monel and other nickel alloys.