Correction and Rebuild of Shell and Tube Heat Exchangers: One time Service

The contractor shall furnish all labor, materials, supplies, tools, equipment, and qualified personnel to: (1) provide and install two new flanged hot water valves at designated line locations; (2) provide all required installation materials including gaskets, bolting, supports, and associated hardware; (3) confirm proper valve orientation, accessibility, and operability after installation; (4) perform leak testing or pressure testing of each affected piping section; (5) remove channel heads, bonnets, and associated covers to access the tube side; (6) inspect tube interiors for fouling, scale, sludge, debris, and visible signs of corrosion or damage; (7) clean tubes using high-pressure water cleaning or mechanical brushing/rodding; (8) remove and dispose of waste, debris, and cleaning residues; (9) visually inspect tubes after cleaning; (10) reassemble exchanger components with new gaskets and seals; and (11) perform pressure testing or leak testing prior to return to service. The work also includes adding isolation valves to six currently failing heat exchangers, including one flanged 150# 8" gate valve on 3-SWHX-2 steam line, two flanged 150# 6" hot water valves on 4-SWHX-3 and 4-SWHX-4, and one 6" butterfly valve on the hot water line between 03-HWHX-3 and 03-HWHX-4. System drain and fill, insulation removal and reinstallation, non-destructive examination, and electrical or controls modifications are excluded from the scope.