Characteristics of casing-type expander coating

Characteristics of casing-type expander coating
In actual operation, if the operating parameters (inlet pressure and outlet pressure) fluctuate greatly, the hydraulic balance of the rotor of the casing-type expander is destroyed, so that the sliding casing-type expander is subjected to large radial and axial forces; in order to verify whether the backup pipeline is intact and ensure that the backup pipeline can be activated at any time, the process is usually carried out once every half month to reverse the pipeline (i.e., the opening and backup pipeline takes turns to open and stop).
And every time the casing type expander opens or stops, the pressure of the liquid medium on both sides of the sealing rubber ring has a short time high and low exchange process, resulting in a short time thrust reverse switching, at this time the thrust casing type expander bearing the thrust is impelled. Due to these characteristics of axial force during the actual operation of casing type expander, it is required that the thrust casing type expander not only has good wear resistance, hardness, etc., but also must have high compressive strength, toughness, extrusion resistance and mechanical shock resistance. The compressive strength and toughness of hard graphite is poor, thus easy to break and rupture when the casing type expander is running, the broken piece is carried away by the medium liquid, under the action of the vortex of the liquid, the casing type expander tampering displacement increases, the radial vibration increases, the radial graphite casing type expander is broken by the extrusion and impact of the shaft.
The casing type expander inner parts are damaged by mutual friction, the noise is enhanced and the pipeline output is reduced until it is unable to run. All frictional subsets of the casing type expander parts are made of high quality silicon carbide. The purity of high quality silicon carbide is very high, and the content of silicon carbide is more than 99%, which is resistant to corrosion of ammonia and has high strength, elasticity, toughness and wear resistance, so that the extrusion and impact resistance of the casing type expander is greatly improved, and the service life is more than 10 times that of other sliding casing type expander (such as graphite).