Application of centrifugal Chemical pump in Chemical production

Chemical centrifugal pump is generally suitable for chemical plants and chemical industry, the commonly used chemical centrifugal pump materials are stainless steel, fluoroplastic material or carbon steel and so on. The use of each kind of chemical centrifugal pump is different, which should be decided according to the actual conveying medium. Because the medium conveyed by the chemical pump is often toxic, harmful, corrosive and has high or low temperature, the chemical centrifugal pump is required to meet the needs of the chemical process, with no leakage or less leakage, corrosion resistance, wear resistance, high temperature or low temperature resistance. can transport critical liquid, reliable operation.

Cause analysis and treatment of common faults:

The failure of centrifugal pump is caused by a variety of reasons, including unreasonable selection and inherent faults of equipment, installation, start-up and operation. For example, pump overpower due to unreasonable selection; pump cavitation and insufficient flow (unit: cubic meters per second) caused by design and manufacturing defects; vibration and noise of pump caused by installation failure (generally refers to noisy, harsh sound. Seriously exceeded the standard; due to pump start-up and operation failure, the pump can not start normally and the water output is gradually reduced, packing heating, bearing overheating and so on.
When the pump is running with abnormal sound or excessive vibration, the small unit composed of pump and motor should be stable and the sound should be normal. If this small unit has noise or abnormal vibration, it is often a harbinger of pump failure and should be stopped immediately to eliminate hidden dangers.

The causes of failure may be: unbalanced rotation of the rotor of the pump or motor, misalignment between the pump and the motor, aging of the wheel apron, uncorrected impeller balance, insufficient stiffness of the pump foundation, loose anchor bolts, excessive wear of bearings or seals, resulting in rotor eccentricity, gas in the pump, no pumping vacuum, improper bearing and packing lubrication. Excessive wear, bearing wear or damage, too much or too little lubricating oil (grease), too much suction, cavitation occurs at the inlet of the impeller, bubbles appear in the low-pressure area when the liquid passes through the impeller, bubble collapses in the high-pressure area, resulting in vibration caused by impact, at this time, the installation height of the pump should be reduced, the pump inhaled foreign body, blockage or damage to the impeller, the machine should be stopped to clean up the foreign body or replace the damaged impeller, vibration caused by resonance. The main reason is that the natural frequency of the rotor is the same as the speed of the pump, resulting in resonance and so on.