ASME B31.9 pdf download Building Services Piping ASME Code for Pressure Piping, B31 900.1.3 Exclusions. This Code does not apply to econ-omizers,heaters, pumps, tanks, heat exchangers, andequipment covered by the ASME Boiler and Pressurevessel Code (BPVC). 900.1.4 Units of Measure. This Code states values inboth Usc and sl units. Within the text, the Sl units areshown in parentheses. The values...