How to select sand pump shaft seal
How to select sand pump shaft seal? Sand pump is also named as dredge pump, slurry pump, gravel pump as a dredging equipment. How to select sand pump, sand pump includes on board dredge pump, submerged dredge pump, double casing dredge pump, single casing dredge pump, hydraulic submersible dredge pump, electric submersible dredge pump etc.
How to select sand pump shaft seal? China Do Pump is a manufacturer of electric submersible sand pump, electric submersible dredge pump, electric submersible slurry pump, hydraulic submersible pump, dredge pump, ladder pump, booster pump, cutter suction dredger and dredging equipment.
In this article, dredge pump for sale China Do Pump is going to share with you the tips of how to select sand pump shaft seal.
1. the definition and type of sand pump shaft seal
There is a pressure difference between the fluid in the pump and the atmospheric pressure outside the pump. The liquid leaks outward along the gap between the shaft and the housing. For this purpose, a sealing device is required, which is called a shaft seal.
At present, there are three types of shaft seals commonly used in sand pumping, namely, the power supply of the expeller seal, the packing seal and the mechanical seal.
2. the specific selection conditions of the shaft seal of the sand pump
When the on-site water volume and water pressure can meet the requirements of the slurry pump shaft sealing water, it is recommended to select the auxiliary impeller power seal.
This type of shaft seal is widely used in coal washing systems due to its low cost and ease of maintenance.
When the on-site water supply is short or the water pressure is unstable and the slurry pump shaft sealing water is not required, the grease can be used to lubricate the auxiliary impeller dynamic seal.
At this time, it is necessary to add grease once or twice a day during the operation to ensure that the filler is in a good lubrication state. In order to improve the reliability of the operation, the filler may be selected from carbon fiber immersed tetrafluoroethylene filler.
The packing seal form is mainly used in the second stage and above of the series pump.
In the dredging industry, the pumping line of the sand pump is short, and the head is generally not more than 80m.
A single-stage pump can meet the actual needs.
There is no form of shaft seal that is in series and therefore generally does not use a slurry pump packing seal.
Mechanical seals are preferred in dredging industries such as in-cabin pumps that do not allow dilution of the slurry (or addition of water).
In order to improve the quality of the on-site environment, the operation cycle is long and there is no leakage at the site.
In the above several cases (sufficient water supply, shortage, no water to dilute the slurry), mechanical seals can be selected, and the appropriate mechanical seal structure and friction pair materials can be selected according to the concentration, temperature and feed pressure of the slurry.
The only drawback to using mechanical seals is the increased investment in equipment.
For more sand dredging pump solutions, contact dredge pump for sale, China Do Pump at info@dopumpgroup.com or call us at +8615031104888.
