What Causes the Mechanical Overheating of the Slurry Pump?

As a Slurry Pump Manufacturers, share with you.

The main reasons for the failure of the mechanical seal of the slurry pump are:

The slurry pump machinery is out of tolerance. The correct assembly tolerances are necessary for the installation of mechanical seals. The shaft must have the proper surface roughness and the correct dimensions. However, the manufacturer rarely provides tolerance data, which are critical to the installation. The dimensional accuracy and form and position tolerances of mechanical seals must meet the requirements of the drawings, and excessive tolerance will cause premature seal failure.

Submersible Pump

The mechanical sealing surface of the slurry pump is open. When the sealing surface is opened, the solid particles in the medium enter the sealing surface under the action of the liquid pressure. After the sealing surface is closed, these solid particles are embedded in the surface of the soft ring, which actually becomes a "grinding wheel" which will damage the surface of the hard ring. When repairing mechanical seals, 85% of seal failures are not caused by wear, but have leaked before wear. Because the moving ring or rubber ring is fastened to the shaft, when the shaft moves in series, the moving ring cannot fit in time, so that the sealing surface opens, and the sealing surface is closed with hysteresis, allowing solid particles to enter the sealing surface. At the same time, there are solid particles between the shaft and the sliding parts, which affect the sliding of the rubber ring or the moving ring. In addition, the medium will also produce crystals at the friction between the rubber ring and the shaft, and there will also be solid substances in the spring, which will cause the sealing surface to open.

The slurry pump machinery is overheated. Since heat is generated on the sealing surface, the operating temperature of the rubber ring should be lower than the design specification. The service temperature of fluorine rubber and polytetrafluoroethylene is 216℃, and the service temperature of nitrile rubber is 162℃. Although they can withstand higher temperatures, the heat generated by the sealing surface is higher, so the rubber ring continues to vulcanize In the end, it will lose its elasticity and leak.

The heat between the sealing surfaces will also cause the crystallization of the medium, such as carbon formation, causing the sliding parts to be stuck and the sealing surface to be condensed. Moreover, some polymers are coked due to overheating, and some fluids lose lubrication due to overheating, and even flash fire.

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