Flowloc

600mm silt trap and Flowloc chamber base

The USW30 can be used as a 600mm silt trap, with or without the USW29 filter. It is also used as the housing for the range of Flowloc control units and orifice plates. The chamber base can be installed within a precast concrete manhole or with a riser piece (available as part of the Waterloc range.) Both installation methods require the base to be level and bedded into a 150mm concrete base and surround. The base has spigot connections suitable for either 110mm or 150mm pipe sizes at the inlet and outlet, with additional 110mm side connections for use in off-line installations. All pipe connections should be fitted with 600mm long rocker pipes to allow for ground movement.

Filter

Attach the end of the filter chain to the inside of the riser with the P clip and screw provided, then lower the filter into the base so that it locates against the inlet.

Flowloc vortex flow control unit

Using the solvent cement supplied with the kit, bond the 20mm pipe socket to the length of 20mm pipe, then bond the socket to the handle attachment on the Flowloc device. Allow the solvent to set before lowering the controller into the base and engaging the square flange into the coupling slot. The handle can be cut to length. To set the overflow level, fit the 50mm pipe into the socket in the chamber base aluminium coupling and mark the pipe at a point coinciding with the top, or just below the top of the storage tank. Cut the pipe at this point and bond into the socket with solvent cement, then secure the open end to the inside of the riser wall with the pipe clip and screws provided.

Chamber Riser

To fit the 600mm riser to the chamber base, fit the inlet ring seal into the first corrugation of the riser, lubricate the seal with silicone grease and insert fully into the socket of the base with firm pressure. Fit the clamp ring between the grooves of the base socket and locate the four clamps in the corrugations of the riser before tightening. Prior to backfilling with granular material, leak test the seal by capping the inlet and outlet connections and filling the riser with water to approximately 0.5m above the seal. The riser should be cut back to within approximately 200mm of finished ground level before casting a concrete collar with a bond breaker membrane around the riser to prevent load transfer to the shaft. A cast iron inspection cover and frame with a minimum clear opening of 750mm can then be set on engineering brickwork to complete the installation.