1. Steam erosion phenomenon

The phenomenon of steaming refers to partial vaporization due to the pressure of saturated steam pressure under the conveying temperature or lower than the pressure of the pump entrance (actually at the entrance of the blades), causing noise and vibration to cause pumps. In severe cases, the flow of the pump flow The significant decline in the pressure head and efficiency. Obviously, the phenomenon of steam erosion is not allowed to occur for the normal operation of the centrifugal pump. The key to avoiding the occurrence of auto erosion is that the installation height of the pump must be correct, especially when the volatile liquid with a high conveying temperature is high.

2. Installation height HG

Allowing the vacuum height HS refers to the maximum vacuum that the pressure P1 can be achieved at the entrance of the pump, and the actual allowing the vacuum height HS value is not the value calculated based on the type, but the value measured by the pump manufacturer experiment. This value is attached to the user to find it for users. The position should be noted that the HS value given in the pump sample is the value of the working medium with water. The operating conditions are 20 ° C and the pressure of 1.013 × 105Pa. When the operating conditions and the working medium are different, they need to be converted.

(1) Transfer water, but the operating conditions are different from the experimental conditions, you can convert HS1 = HS + (HA -10.33) - (Hυ -0.24) according to the following formula;

(2) Delivery of other liquid When the conditions of the transport liquid and villain are different from the experimental conditions, two steps need to be performed: the first step according to the HS1 of the pump sample;