Delta Dual 800 Groundwater Series Installation Manual page 14

4. Installation guidelines
11. Allow time for the concrete to cure completely, then remove the ballast water.
12. Fit the access cover (not supplied) onto the top of the access shaft so that it is flush with finished floor level.
13. In a roadway application, the chamber should be installed with the top of the access shaft 300 mm below the finished
cover level ensuring that the slab is supported by consolidated backfill. A suitably rated access cover should be embedded
into the reinforced cover slab (to be specified at time of order). It should not bear on undisturbed ground around the
excavation nor directly onto the chamber, so that imposed loads are deflected away from the chamber. Design of the cover
slab is the responsibility of the installer/structural engineer.
14. Once the chamber has been installed and the ballast water has been drained, it is extremely important that all sand, silt,
rubble and general debris is removed from the chamber.
15. Partly refill the chamber with clean water for testing the system upon commissioning, and so that the discharge pipe can
be flushed through.
16. Install the pumps and high level alarm float switch and draw these cables through the cable duct.
17. Install the Delta HLA high level alarm. Please refer to the Delta HLA installation guide.
18. Provide suitable electrical connections (refer to wiring diagrams in Section 6).
19. Commission the pumping station. If you require a commissioning service please contact Delta Membranes on 01992 523 523
between 8am and 5pm, Monday to Friday or by email at info@deltamembranes.com..
11 Delta Dual 800 Groundwater Packaged Pumping Station
THE BALLAST WATER INSIDE THE CHAMBER SHOULD NOT BE REMOVED UNTIL THE BACKFILL
HAS FULLY SET.
FAILURE TO REMOVE SAND, SILT, RUBBLE AND ALL OTHER DEBRIS FROM THE CHAMBER WILL
INVALIDATE THE WARRANTY ON THE PUMPS.
A QUALIFIED ELECTRICIAN MUST CARRY OUT ALL ELECTRICAL CONNECTIONS.
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