Lined Concrete Domes
DRY CREEK WASTEWATER TREATMENT PLANT
Davidson County, Nashville, Tennessee
ABSTRACT: Brown and Caldwell have produced their own thermophilic digester design for over a decade. The two digesters added to the Dry Creek WWTP were constructed with Corr-Tite Concrete Protective Membrane System (CPMS) to protect the top of the walls and the entire dome surface from corrosion by gases generated by the digestion process. The material used was 3mm (120 mil) HDPE.
Corr-Tite® CPMS has been used in wastewater applications for over 20 years.
The first application of the material in digesters was the thermophilic digester at the Western Lake Superior Sanitation District(WLSSD) plant outside of Duluth, Minnesota, in 1998. Since that time, Corr-Tite® CPMS has been
used in many digesters, both flat roofed and domed.
This application was similar to the Duluth project,
and Clark Gunness, currently of Gaussan Inc., was involved early on to lend his expertise to the design process. Once the project was bid, Gaussan personnel were called in to fabricate the Corr-Tite® CPMS system.
The technicians first fabricated the wall and dome linings, then atechnician went to the site when all of the pipes which were to penetrate the lining in the digester were delivered to the general contractor.Each pipe received a specially onsite fabricated boot so that the lining would fit the pipe or sleeve exactly and not allow any leakage.
Technicians were back on site when the dome walls and roof lining were applied, as a good portion of the welding from the wall to the roof would be performed from the top of the dome. The pipes and sleeves which were booted during the prior trip had to be placed in the lining and welded.
another style digester - Denver CO After the dome was completed, technicians made a final trip to weld over all tie holes and to finish seams not accessible during the concrete construction phase. All seams and surfaces were also tested using a high voltage continuity unit which produced 30,000 volts.
Davidson County, Nashville, Tennessee
ABSTRACT: Brown and Caldwell have produced their own thermophilic digester design for over a decade. The two digesters added to the Dry Creek WWTP were constructed with Corr-Tite Concrete Protective Membrane System (CPMS) to protect the top of the walls and the entire dome surface from corrosion by gases generated by the digestion process. The material used was 3mm (120 mil) HDPE.
Corr-Tite® CPMS has been used in wastewater applications for over 20 years.
The first application of the material in digesters was the thermophilic digester at the Western Lake Superior Sanitation District(WLSSD) plant outside of Duluth, Minnesota, in 1998. Since that time, Corr-Tite® CPMS has been
used in many digesters, both flat roofed and domed.
This application was similar to the Duluth project,
and Clark Gunness, currently of Gaussan Inc., was involved early on to lend his expertise to the design process. Once the project was bid, Gaussan personnel were called in to fabricate the Corr-Tite® CPMS system.
The technicians first fabricated the wall and dome linings, then atechnician went to the site when all of the pipes which were to penetrate the lining in the digester were delivered to the general contractor.Each pipe received a specially onsite fabricated boot so that the lining would fit the pipe or sleeve exactly and not allow any leakage.Technicians were back on site when the dome walls and roof lining were applied, as a good portion of the welding from the wall to the roof would be performed from the top of the dome. The pipes and sleeves which were booted during the prior trip had to be placed in the lining and welded.
another style digester - Denver CO After the dome was completed, technicians made a final trip to weld over all tie holes and to finish seams not accessible during the concrete construction phase. All seams and surfaces were also tested using a high voltage continuity unit which produced 30,000 volts.