Non-metallic pump corrosion resistance

To avoid damage to the pump due to medium temperature rise caused by non-metallic pumps operating at low flow rates, typically the minimum continuous flow for non-metallic pumps is 30% of the rated flow, ie the pump is not allowed to operate at less than 30% of the rated flow. Non-metallic pumps have superior corrosion resistance compared to metals Pumps do not suffer from crevice corrosion, pitting, selective corrosion, and electrochemical corrosion in metals. However, the plastic is subject to stress cracking in some corrosive media, which is similar to the stress corrosion of metals. Plastics and rubbers swell or dissolve in some organic solvents and should be used with care. Table 1-67 lists common non-metallic corrosion resistance. Good non-metallic wear-resistant materials are industrial ceramics, wear-resistant rubber and a new high-performance engineering plastics (ultra-high molecular weight polyethylene, polyvinylidene fluoride, etc.). Industrial ceramics (corundum ceramics, silicon nitride ceramics, etc.) have the best wear resistance (a Mohs hardness of 9), but the disadvantage is that they are brittle and fissile. Rubber wear resistance is very good, lined rubber pump containing particles in the media used in the most widely used, the disadvantage is easy to aging and the use of low temperature, generally below 100 ℃. Ultra-high molecular weight polyethylene (UHMWPE) and polyvinylidene fluoride (PVDF) wear resistance is also good (kinetic friction coefficient of 0.1 to 0.22), especially high molecular weight polyethylene is known as the king of wear-resistant engineering plastics, Can be used as a wear-resistant wear-resistant pump material, but the processing and production requirements. Thermoplastic generally considered good wear resistance, thermosetting plastics (such as phenolic fiberglass) wear resistance is poor. However, it should be noted that as the temperature increases, the wear resistance of the plastic will be reduced. Non-metallic pumps generally can not adjust the running clearance, the pump used for a period of time, the operating gap will become larger, the pump efficiency. Therefore, the selection of non-metallic pump should be properly enlarged to improve the pump head, flow and motor power to avoid head flow insufficient or motor overload and so on. You may also be interested in Magnetic Pump, High Temperature Magnetic Pump, Stainless Steel Magnetic Pump, Pipeline Pump, Vertical Pipeline Pump, Horizontal Pipeline Pump, Pneumatic Diaphragm Pump, Electric Diaphragm Pump, etc. Welcome!

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