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Key CSI Projects using Waterproofing Systems

Deer Island Hypochlorite Tanks-Relining

Owner:       MWRA (Mass Water Resource Auth.)

Location:   Winthrop, MA

Engineer/Architect:  Corrosion Probe

CSI was contracted by the MWRA to provide stripping and relining services for Hypochlorite tanks No. 1 and 3 at the Deer Island water treatment facility located in Boston, MA.

The enclosed tanks are located within a secondary containment area each measuring 35-ft high by 40'ft in diameter.

All work within the tanks was classified as permitted confined space access and all CSI employees were required to be trained for confined space access and emergency rescue.


Disconnect all piping to each tank and implement all lock out and tag out procedures.

Erect a systems scaffold in each tank with full planking at the top and a level of full planking around the perimeter at every 7-foot height interval.

Remove the existing adhered rubber system utilizing hydro demolition equipment with water pressures exceeding 40,000 psi.

Sandblast all interior surfaces to white metal prior to priming.

Apply new 1/4-inch rubber by polycorp to all interior surfaces.

Steam cure each tank for 60 hours at 212 F  temperatures being monitored by thermostats located at all levels of the tank.

Reconnect all piping and install new insulation as required.

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