Please have the experts discuss the design for the minimum backflow rate of the pump
Thread Content
I would like the experts to discuss what value is typically used to determine the minimum backflow rate of a pump, before the pump manufacturer provides that value; are there any relevant standards in this regard? Thank you.
The design of the minimum backflow flow rate for a pump depends on specific circumstances, and factors such as the pump model, operating conditions, properties of the liquid, and piping layout need to be taken into account. If the pump manufacturer does not provide data on the minimum backflow rate, it can be estimated based on relevant industry standards or empirical values. Some common specifications or empirical values are as follows: 1. According to the international standard API 610, when the pump is in operation, the minimum return flow rate should be no less than 5% of the rated flow rate. 2. Based on engineering practice experience, the minimum backflow rate of a pump is typically set at 10-20% of its rated flow rate. 3. If the viscosity of the liquid is high, the minimum reflux flow rate can be increased appropriately. It should be noted that the design of the minimum return flow rate must ensure the proper operation of the pump, and prevent issues such as liquid accumulation inside the pump, gas dissolution, and excessive temperature due to an excessively low return flow rate. .
It is generally 25% to 30% of the rated flow rate.