Suitable installation location
Lifting stations installed in the floor slab are often situated in utility rooms, bicycle storage rooms, cellars or ancillary rooms. Sometimes they are also installed directly in underground car parks. In such cases, it is important to ensure that the manhole cover can withstand vehicle traffic (see also load classes for drainage systems).
The chamber must not be within the influence zone of adjacent foundations, i.e. minimum distance a = distance between the lower edge of the chamber and the lower edge of the foundation:
a = ΔH x 1.73
installation depth
The exact installation depth must be determined during the planning stage. This is usually determined by the main drainage pipe, which is laid beneath the floor slab with a gradient towards the lifting station. The total depth from the top of the floor slab (OKFFB) to the bottom of the main drainage pipe at the inlet of the lifting station must be measured. This measurement determines the exact product configuration.
KESSEL Aqualift M underfloor lifting stations, whose chamber is not accessible due to its compact size (LW 400), must be installed to a maximum depth of 80 cm for maintenance purposes (measured from OKFFB to the bottom of the main drainage pipe at the inlet).
Groundwater
For pumping stations installed in the floor slab, the depth to which the chamber is submerged in the groundwater must be taken into account and verified with the selected product. Most KESSEL pumping stations and lifting stations may be submerged in groundwater to a depth of up to 3 m without the need for additional measures to prevent buoyancy.
a. Supply pipe (main drainage pipe)
- The supply pipe to the lifting station must be designed and installed in accordance with the applicable standards. All pipes must be laid in such a way that they can drain naturally.
- The pipes must not be constricted in the direction of flow.
- Changes in direction of main or collection pipes must only be made using bends of ≤ 45°.
- Transitions to larger nominal sizes must be made using transition fittings or other suitable connections (e.g. transition seals). In collector connection pipes, eccentric transition fittings should be installed with the centres aligned. To facilitate inspection, installation in main drainage pipes must be flush with the pipe bed.
The pressure pipe connection is in the PE DN 80 (OD=90 mm) version.
KESSEL recommends using standard PE-HD electrofusion sockets.
Alternatively, the pressure pipe can also be connected using standard Clamp connectors
(see KESSEL accessories, item nos. 28090/28091/28092).
b. Pressure pipe
- The pressure pipe for lifting stations installed in the floor slab must be routed from the lifting station to the nearest reference point in the room. This is usually done beneath the floor slab up to the nearest wall, where the pressure pipe is routed through the floor slab.
- In the case of a waterproof floor slab, the passage through the floor slab must be waterproofed. This can be achieved using a liner pipe with a sealing insert or a wall collar.
- Pressure pipes beneath the floor slab are exposed to the ground and must be suitable for this purpose. Pressure pipes made of PE-HD or PVC are used here.
- For smaller pressure pipe dimensions (up to DN40/DA50), the KESSEL pressure pipe set (accessories) can be used. For larger pressure pipe dimensions (from DN40/DA50), KESSEL recommends connecting a standard HD-PE pipe.
c. Ventilation pipe
- In the case of lifting stations, the ventilation pipe is connected directly to the tank in the floor slab. Depending on the type of station, either direct connections or drilling surfaces are provided for this purpose.
- The ventilation pipe must be routed from the lifting station to the nearest reference point in the room. This is usually done beneath the floor slab to the nearest wall. There, the ventilation pipe is routed through the floor slab.
- In the case of a waterproof floor slab, the passage through the floor slab must be waterproofed. This can be achieved using a liner pipe with a sealing insert or a wall collar.
- Ventilation pipes beneath the floor slab are exposed to the ground and must be suitable for this purpose. Therefore, a standard KG or KG2000 pipe is used here. The smallest size available is DN 100. Consequently, the ventilation pipe is laid beneath the floor slab in DN 100. Later, inside the building, the ventilation pipe can be continued using a HT pipe (or similar) in a minimum size of DN 70.
d. Cable duct
- In the case of lifting stations, the empty cable duct is connected directly to the tank in the floor slab. Depending on the type of system, either direct connections or drilling surfaces are provided for this purpose.
- It should be laid with a slight gradient (we recommend 1–2%) towards the lifting station so that any condensation can drain away and the cables do not remain permanently submerged in water.
- In the case of a waterproof floor slab, the passage through the floor slab must be waterproofed. This can be achieved using a liner pipe with a sealing insert or a wall collar.
- DN is the abbreviation for "diameter in millimeters".
