Selection suggestions for vertical suspended long axis submersible sump pumps in dredging

The selection of vertical suspended long axis submersible sump pumps in municipal dredging scenarios must focus on the core working conditions of high solid content sludge transportation, rapid deployment, and anti clogging and wear-resistant, and match parameters and configurations accordingly. Specific selection recommendations are as follows:
Selection of core performance parameters
·Flow selection: Based on the volume of the pipeline network/collection well at the dredging operation site and the required emptying time, a flow margin of more than 30% is reserved to significantly reduce the duration of sludge pumping operations and improve dredging efficiency.
·Head selection: Based on the comprehensive calculation of the depth of the inspection well, the distance of mud transportation, and the vertical lifting height, a 15% head margin is reserved to avoid the problem of insufficient power during the transportation of high concentration mud.
·Subsea depth selection: Customized according to the actual depth of the inspection well/collection well at the dredging operation site. The length of the underwater insertion is 300-500mm lower than the lowest liquid level at the bottom of the pool, ensuring that the entire process is submerged below the liquid level and can be started directly without the need for pumping.
Structural selection for adapting to working conditions
·Impeller selection: Priority should be given to large channel unobstructed impellers, which can smoothly pass through fiber debris with a diameter of 5 times the pump diameter and solid particles with a diameter of 50% of the pump diameter. There will be no jamming or blockage during sludge pumping.
·Material selection for overcurrent components: High chromium wear-resistant alloy material is preferred for high solid sediment dredging conditions, cast iron wear-resistant coating material can be used for ordinary municipal rainwater pipe network dredging, and 316L stainless steel material is selected for coastal dredging scenarios, greatly extending the service life of components.
·Customized function selection: For dredging scenarios with a large amount of compacted silt, priority should be given to selecting a bottom mixing impeller, which can stir the compacted silt deposited at the bottom into a suspended slurry, greatly improving the efficiency of silt extraction and reducing residual silt at the bottom.
Mobile homework matching selection
·Drive control selection: For mobile dredging operation scenarios, priority should be given to models that can be matched with diesel mobile chassis, without the need for external fixed power supply, and can quickly reach any dispersed dredging point for operation.
·Sealing and lubrication selection: For dredging conditions, it is necessary to use a guide bearing configuration with external cooling and lubrication water, matched with a self closing sealing system. After shutdown, it can prevent sewage from entering the guide bearing and prevent sediment from entering the bearing and causing rapid wear.
·Redundant configuration selection: For long-term normalized dredging operation scenarios, pump sets are configured with 2 in use and 1 backup. In the event of a single pump failure, other equipment can still complete dredging operations normally, avoiding interruption of dredging operations.
This vertical suspended long axis submersible sump pump selection scheme is fully suitable for the complex working conditions of municipal dredging scenarios, ensuring stable operation of the vertical long axis submersible sump pump equipment during long-term high load pumping and discharging of sludge, significantly reducing operation and maintenance costs, and improving dredging efficiency.