8.

8.0 GREASETRAP LIDSETS

Havestock greasetrap lids are constructed by joining single gas-tight covers together. As a result, the greasetrap lids exhibit the same performance characteristics as the range of single access covers and frames.

These covers are mainly used on precast concrete grease interceptor traps. Greasetrap covers are available for the complete range of Everhard precast greasetraps.

Havestock greasetrap lids are available from all Everhard branches :

Havestock greasetrap lids are fully gas-tight and are also available with brass edges, inspection peep eyes and retaining bolts. Greasetrap lids are now available in the traditional and solid Litelift styles which do not require any infilling.

Installation of Greasetrap Lids

It is important to install greasetrap lids so that the unit is gas-tight when complete. This is achieved with the following recommended installation method.

Option 1 - Lid fitted directly to the top of the tank or riser.

This method can only be used with full width lids that sit on or past the precast walls of the trap.
Allow 50mm for grouting into the precast rebate.

Option 2 - Cast into a concrete collar which in turn sits on top of the tank or riser.

This method is used on covers with are less than the full width of the trap.
Concrete collar to be made to the following specifications :
Collar to 100mm all around larger than the lid.
Class A lids - collar must be 100mm deeper than the frame.

Class C lids - collar must be 150mm deeper than the frame and must have 12R deformed bar reinforcing at 150mm centres.

Installation Steps

All lids are manufactured in our Northgate factory and during production are fitted with installation bolts .
Installation bolts are identified by way of an attached white tag with the words "Remove bolt before filling lid".
These bolts hold the covers together and in line as well as holding the lid secure for transportation to site.

Important ~

1. Install the lid and/or collar to the tank, making sure the lid is laying flat and square to the tank
~ do not remove installation bolts or covers at this stage.

2. Ensure the frame is fully supported undeneath with concrete.

3. Concrete or grout the frame into position and allow to cure ~ do not fill the lids yet.

4. After curing, remove installation bolts and fill the covers with concrete.

5. At least 20 Mpa cement should be used for the lid to realise it's full strength potential.

Remember :

Lids must be installed flat and straight and should be full width or fitted with a concrete collar.

Installation bolts must not be removed until the frame has been concreted into position and the concrete cured. Installation bolts must be removed prior to filling the covers or else the lids will be permanently fixed to the frame.

Once the covers have been filled, all surfaces should be cleaned and heavy grease applied to the mating surfaces before returning the covers to their original position.