KESSEL AG

Catalogue EN 4.1

5.1 Grease separators 313

Connection to the drainage system

with a lifting station or a hybrid lifting station.

Separator outlet below sewer level – lifting station required

4

The wastewater must flow into the grease separator

system with gravity. Grease separator systems whose

water level is below the backwater level (see EN 752-1)

or sewer level should be connected to a properly sized

lifting station (shown as 1 in the illustration).

The wastewater pipes to the separator systems must

have a gradient of at least 2 % (1:50) to prevent

grease blockage. If this is not possible for construc-

tional or operational reasons, and/or if longer pipes

are necessary, suitable measures must be taken to

prevent grease blockages and deposits. The transition

from downpipes to horizontal pipes must be handled

with two 45° curved fittings with a large radius.

A wastewater calming section, the length of which

corresponds to at least the 10-fold of the inlet pipe's

nominal width in millimetres, must then be provided

immediately before the inlet of the separator.

Discharge points, such as floor drains, must be

equipped with odour traps and, if necessary, with

sludge buckets that can be removed for cleaning.

2

3

1 Properly sized lifting station

3 Wastewater calming section

1

2 Two 45° curved fittings

4 Connected drainage fixtures

Separator outlet above sewer level- hybrid lifting station required

4

2

3

1 Properly sized hybrid lifting station

3 Wastewater calming section

1

2 Two 45° curved fittings

4 Connected drainage fixtures

5.1

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