Selective Repairs of Digesters 2 & 3 at Humber Treatment Plant

Cleaning of the interior existing sludge piping within each Digester and within the Digester Gallery, including high pressure washing.

Refurbishment of sludge heat exchangers with gaskets and insulation replacement and cleaning and high pressure washing of associated sludge piping.

Cleaning of interior of existing scum piping at the South Primary Clarifiers, Scum Pumping Stations, Access Tunnels, and Digester Gallery, including high pressure washing.

Decommissioning, selective demolition and removal of existing systems associated with the Digesters, digester gas mixing and conveyance piping, gas handling equipment, and associated electrical and instrumentation equipment.

Removal of existing waterproofing and gas proofing inside the Digesters and Digester Overflow Boxes

Decommissioning, selective demolition and removal of existing sludge and scum valves, gas valves, hot water pumps and valves, instrumentation, piping and appurtenances in the existing Digesters and Digester Gallery.

Demolition of existing overflow box covers, telescoping valves, and instrumentation and appurtenances.

Decommissioning, selective demolition and removal of portions of the digester hot water heating system, including three-way control valves, hot water recirculation pumps, piping, instrumentation, and appurtenances in the existing Digester Gallery.

Removal and replacement of all waterproofing, gas proofing, insulation, and protective coating systems on two existing Digesters and Digester Overflow Boxes.

Structural and architectural repairs to interior and exterior concrete at two existing Digesters and associated digester overflow boxes.

Replacement with new of digester gas mixing equipment for two existing digesters including packaged bubbler equipment, instrumentation, and piping modifications.

Replacement with new of digester gas safety equipment for two existing digesters, including two counterweight pressure relief hatches on each digester, and one 3-way selector valve.

Refurbishment of roof mounted access hatches and viewing ports, including gasket replacement, on two existing digesters.

Refurbishment of digester overflow boxes including replacement of access hatches, and replacement of telescoping valves and level instrumentation.

Replacement with new of two hot water recirculation pump sets (2 pumps per set), associated 3-way hot water control valves, and associated high pressure switches, for two digester sludge heat exchangers in the Digester Gallery, including associated wiring and pump control panel modifications.

Replacement of sludge valves in the Digester Gallery.

Inspection and pressure testing of exterior gas piping on two existing digesters, including removal and replacement with new of gas piping insulation.

Pressure and leakage testing of two existing digesters.

Inert gas purging of two existing digesters and associated gas piping.

RPU and SCADA system modifications. Integration of the new and upgraded system into the existing Humber Treatment Plant RPU and SCADA systems.