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Main Causes of Failure of High Pressure Mud Pump in Petroleum Machinery?


The main reasons for the failure of the matching seal of the high-pressure mud pump of petroleum machinery are as follows:
1. Sealing surface open
In the repair of petroleum machinery high pressure seal, 85% of the seal failure is not caused by wear, but has been leaked before wear. When the sealing surface of the mud pump fittings is opened, the solid particles in the medium enter the sealing surface under the action of 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" and will damage the surface of the hard ring. Since the moving ring or rubber ring is fastened on the shaft, when the shaft moves in series, the moving ring cannot fit in time, so that the sealing surface is opened, and the sealing surface is closed with hysteresis, so that solid particles 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 in the rubber ring and the shaft friction part, and there will be solid substances in the spring, which will open the sealing surface.
2. Overheating
Due to the heat generated on the sealing surface, the rubber ring should be used at a temperature lower than the design specification. The use temperature of fluorine rubber and polytetrafluoroethylene is 216 degrees, and the use temperature of Ding Qing Yu rubber is 162 degrees. Although they can withstand higher temperatures, the heat generated by the sealing surface is higher, so the rafter rubber ring There is a danger of continued vulcanization and eventual loss of elasticity and leakage.
The sealing surface will also cause the crystallization of the medium due to heat, such as carbon, causing the sliding parts to be stuck and the sealing surface to be condensed. And some polymers due to overheating and coking, some fluids due to overheating and loss of lubrication and even flash fire.
In addition to changing the condition of the medium, overheating will increase its corrosion rate. Caused by deformation of metal parts, alloy surface cracking, and some coating cracks, the design should use balanced mechanical seal to reduce the specific pressure to prevent overheating.
3. out of tolerance
The correct assembly tolerance, for the installation of petroleum machinery high pressure seal is very necessary, the shaft must have the right surface roughness and the correct size, but the manufacturer rarely provides tolerance data, these data are critical to the installation.

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Main Causes of Failure of High Pressure Mud Pump in Petroleum Machinery?

There are three main reasons for the failure of the seal of the high-pressure mud pump of petroleum machinery: 1. When the sealing surface is opened to repair the high-pressure seal of petroleum machinery, 85% of the seal failure is not caused by wear, but has leaked before wear. When the sealing surface of the mud pump fittings is opened, the solid particles in the medium enter the sealing surface under the action of 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" and will damage the surface of the hard ring. Since the moving ring or rubber ring is fastened to the shaft, when the shaft moves in tandem, the moving ring cannot fit in time, so that the sealing surface is opened, and the sealing surface is closed with hysteresis.


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