how to determine Submersible sewage pump pool size

Determine the volume of the sump The size of the sump of the sewage pumping station should be based on the changes in the flow into the flow, the type of sewage pump selected, the number of units, work system, pump operation and start time and so on. The pool volume is too large will cause a large pool of sedimentation and increase the project cost; volume is too small and can not be full of water halo conditioning requirements. Therefore, according to the above conditions should be reasonable to determine the catchment volume.
Set the volume of the pool to meet the hydraulic layout, grille and sewage pump suction pipe installation requirements, in a timely manner in the future water pumping and avoid frequent pump starting and shutting down on the basis of the pool to minimize the capacity to reduce costs and reduce the dirt Pool deposition and corruption. Cistern volume includes dead volume and effective volume in two parts. Dead volume refers to the volume below the lowest water level, effective volume is the maximum water level in the pool and the lowest water level between the volume. According to drainage regulations, the effective volume of catch basin should meet the following requirements:
1) For the large-scale sewage pumping station which is running all day and night, the effective volume of the catchment shall be calculated by not less than the largest one pump in the pumping station. If the pump unit is automatic control, the large flow submerged pump shall not be operated every hour. More than 6 times; when the artificial management, the pump should not be more than 3 times per hour.
2) For small-sized sewage pumping stations, since nocturnal sewage flow is likely to stop operation at night, in this case, the sump volume must be able to store inflows during the night stop operation period.
3) for the factory sewage pumping station sump, but also should be based on a short period of time to review the volume of the shower drain.
4) Sewage pump The capacity of the pump pool shall be calculated according to the volume of sludge discharged once and the pumping capacity of the mud pump. The volume of the sludge pool of the activated sludge pump house shall be determined according to the volume of the returned sludge, the amount of surplus sludge and the capacity of pumping of the sludge pump.
5) With the pump control cabinet according to the pool level automatic control pump stops pumping station, you can use the catchment to the amount of water and pumping time for each pump to calculate the effective volume, the formula
Vm1n = TminQ / 4
Where Vmin - the minimum effective volume of cisterns (m3);
Tmin - pump minimum operating period (s);
Q - pump flow (m3 / s).
The maximum designed water level of the sewage pump station shall be calculated according to the filling degree of the inlet pipe. Design average water level should be used when the design of the average flow into the water level. The minimum designed water level of the sump shall meet the requirements of the suction head of the selected pump. Self-irrigation pump room should also meet the requirements of pump impeller immersion depth.