Why Does The Fire Fighring Pump Leak

May 24, 2025

1, Analysis of Leakage Phenomenon of Fire Pump
A fire pump is a machine used to transmit fire water. However, due to the easy occurrence of some malfunctions under different working conditions, one of them is the leakage of the fire pump.
Fire water pump leakage can be divided into two types of faults: internal leakage and external leakage, but neither of them will affect the normal flow rate and head of the fire water pump.
Firstly, let's talk about the relatively easy to understand external leakage. External leakage refers to the clear visible leakage of clean water from the body of the fire pump from the outside. The location of the leakage is not fixed, but mostly occurs in mechanical seals, shaft seals, and motor connectors, and even on the surface of the body.
The phenomenon of internal water leakage cannot be manifested on the fire pump, but its flow rate and head are significantly reduced at the outlet position.
However, whether it is internal or external leakage, it is a type of fire pump failure that requires careful identification and timely handling to prevent larger malfunctions from occurring.
2, Reasons and treatment methods for leakage of fire water pumps
There are various reasons for external leakage of fire pumps, including damage and unevenness of the sealing surface, failure to tighten bolts during pump installation, and sand holes or cracks in the pump body.
Check the location of the fire pump leakage to determine if there is a possibility of damage to nearby areas. For example, if there is more leakage near the mechanical seal, the problem with the mechanical seal can be identified first. If there is water leakage on the pump body, it may be due to cracks in the body.
After determining the cause of the water leakage, the fire pump will be disassembled for further confirmation. If it is a sealing problem, it needs to be resealed and the sealing gasket replaced.
When it is confirmed that there are cracks in the pump body, it should be replaced directly and continued use is prohibited.
The main cause of internal leakage often comes from the damage of check valves. To determine whether internal cracking or leakage has occurred, simply run the fire pump for a period of time, stop it, and observe whether the pointer of the pressure gauge installed on the outlet pipe of the fire pump changes. This can accurately determine whether the pump has internal leakage.
If internal water leakage is found, the seal of the check valve needs to be repaired or replaced with a new check valve.
That's all for the introduction about the problem of fire pump leakage. If friends from all over the world have any needs for products, prices, and technologies such as fire hydrant pumps and fire sprinkler pumps, they can consult for free. The fire pump manufacturer looks forward to cooperating with you.