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Inlet piping

Wastewater entering a grease separator from the kitchen must do so in a calm manner in order to not agitate the sludge and grease layers inside the separator. Down pipes from the kitchen should be connected to the horizontal pipe with two 45 degree fittings (1) with at least 250 mm between the two fittings (2) (no 90 degree fittings should be used). No downward pipes should be connected to the main separator inlet pipe immediately prior to entering the separator.

For a separator with a Ø 110 inlet, no downward connection should be made within 1 meter of the inlet to the grease separator - for a Ø 160 inlet a 1.5 meter distance should be observed (3) - for a Ø 200 inlet a 2.0 meter distance should be observed. Separator inlet pipes should be laid with at least a 2% (1:50) slope to the separator. In the case that the main inlet pipe is laid through cold rooms or underground, equipping this pipe with insulation or a heating system equipped with a thermostat should be considered.

Ventilation

Inlet and outlet pipes from grease separators must be properly vented. The main pipe to a grease separator should be vented to the open atmosphere (normally to the roof of a building). Any additional inlet pipe 5 meters or longer which is connected to the main pipe should also be separately vented. According to EN 12050-1 all sewage pumps / lifting stations must be ventilated to the open atmosphere (roof of building). The ventilation pipe of a pump / lifting station is not to be connected to a grease separator's vent pipe.

 

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