"Doyle and Roth Manufacturing Approx. 2200 square feet carbon steel shell and tube heat exchanger. 3ft10in diameter X 14ft5in face to face. Shell rated 250 PSI @ -20 to 438 degrees F. (691) 7/8in carbon steel tubes rated 20 PSI @ 18 to 825 degrees F. National Board# 17819, S/N J8419. 20in service nozzles, no heads. Built 1997. Repaired 2007. "
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