Grease Traps GT Range

Grease traps should be used to support the drainage system and help prevent grease and liquefied fats solidifying and blocking the drainage pipes.

Grease traps are particularly necessary in catering and small processing establishments and small commercial kitchens where more than 30 meals per day are served regularly or grease and fats are used in a catering process and waste by products are readily discharged via the foul drainage system.

Typical applications are cafe's and small hotel restaurants sandwich shops, takeaways and fast food outlets, small bakeries and confectioners.  As show our small grease traps feature 3 models in the GT standard grease trap range which are designed for high levels of grease and fat bi products, for example takeaways and burger restaurants.

GT1 - Up to 300 covers per day £300.00 + VAT		GT2 - Up to 600 covers per day £391.00 + VAT		GT3 - 600+ covers per day £430.00 + VAT
Nominal Size	1.5	Nominal Size	3.0	Nominal Size	4.5
Storage capacity	150 ltrs	Storage capacity	300 trs	Storage capacity	450 ltrs
Standard pipe invert	110	Standard pipe invert	110	Standard pipe invert	110
Overall Height	595	Overall Height	595	Overall Height	610
Length	750	Length	1530	Length	1670
Width	600	Width	600	Width	690
All dimensions above in millimeters

Sizing a Grease Trap / Separator

The new European design standard for Grease Separators EN 1825 states that to calculate the correct size or NS (Nominal Size) of grease trap or separator then four major factors are required.

• Maximum flow rate of water.
• Maximum temperature of water.
• Density of grease/oils to be separated or trapped.
• Influence of cleaning and rinsing agents used. 

If we assume that parts 2, 3 and 4 all have a denomination of 1.5 when multiplied together, then a simple calculation can be used to ascertain the size of unit required. This is the maximum flow rate x 1.5.
Flow rates can be calculated from the water usage per day from your facility, which in kitchens and restaurants as a rule of thumb is 70% of the metered water passes into the drainage system and through the grease trap.

For Example
So if you use 1000 litres per day take 70% of this then divide this by the number of hours the facilities are in use, then divide by 60 to minutes then divide by 60 to seconds.

As an example a small cafe serving hot food running 8 hours and using 1000 litres per day of water (70%) metre reading will only generate a flow of 0.03 litres per second, multiply this by 1.5 and the nominal size required is only 0.05. It is recommended that a product just above the calculated nominal size is used.

The standard also requires that the unit has then to have a minimum volume for sludge (solids, vegetable matter) of 100 times the nominal size for all installations, other than abattoirs and similar establishments which require it to be 200 times. So for the above application of 1000 litres of water per day then the trap would have a sludge/solids retention of around 5 litres. So you would use our base model the GT1 with or without filter which would give you 30 times this amount.

Installation & Maintenance

The GT range are manufactured from robust polyethylene and can be installed either over-ground or underground. They should be installed in a minimum of 100 to 200mm of concrete. Set them into a wet concrete base as shown and then fill the units with water. Then pour concrete in a single lift in the GT & GFT range and 3 lifts in the GS range. If you want to extend the units invert then 250mm extensions are available at extra cost as shown below left.  Please note that units should not be installed with these extensions below a 600mm invert as access may be required to the filters we recommend concrete rings or brick built access shown below centre. If unsure please ask for more details

As there is no way of calculating the levels of solids and grease that enter the system grease traps and separators should be inspected and maintained regularly. We recommend an inspection at least once a week and maintenance as required. If you use our Hydra Grease Eater system this will greatly reduce the annual cost of your maintenance programme.

Grease-Eater

Hydra Grease Eater is a liquid grease and fat treatment which consumes all grease and most processed fats within the grease trap and drainage system.
Used daily your grease trap and drainage systems will be free of the grease and fats which cause 99% of the problems caused in the drains outside most busy kitchens.
The product comes in 5 litre or 20 litre containers and can be dosed by automatic pump or manually poured into the sink or grease trap using a manual dispenser.