One: pump cooling purpose
① Reduce the temperature of the bearing of the oil pump.
(2) Take away a small amount of liquid leaking from the shaft seal, and export the friction heat.
③ Reduce the temperature of the sealing chamber, improve the working conditions of the sealing, prolong its service life.
(4) insulation pump support seat (for high temperature medium pump), in order to prevent the displacement of concentricity caused by thermal expansion of the pump and the motor.
(5) such as the delivery of high steam pressure liquid (such as liquefied gas, liquid ammonia, etc.), can be passed into the mechanical seal static ring back or jacket of the cooling water to 40 degrees Celsius hot water, to prevent liquefied gas or liquid ammonia due to pressure evaporation and icing, and prevent rubber or ptfe sealing ring hardening brittle, lose sealing effect.
Two: cooling water quality
The oil pump of petrochemical plant generally needs cooling water to cool the relevant parts of the pump. Circulating water or fresh water can be used for cooling water. Circulating water is generally used. If the circulating water contains more impurities and suspended matter and is easy to scale, it will affect the sealing effect and the normal operation of the pump, you can choose fresh water.
When the fouling coefficient of circulating water or fresh water is greater than 0. 35 Km2·K) /kW and the temperature of conveying liquid is above 70'C. Softened water can be selected and recycled, but should be used as far as possible not softened water and recycled water.
