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Pumps use the liquid they’re pumping as a coolant, dissipating heat generated during operation. To ensure proper pump function, it’s crucial it remains in contact with the liquid it’s moving. Therefore, it’s recommended to manually rotate the pump initially to check for obstructions and ensure all parts are moistened. Also, verify that the parts are at the liquid’s temperature to prevent thermal shock.
Operating in a low suction level (dry run) occurs when a pump isn’t in contact with the liquid it should pump. This situation causes excessive heating, damaging the pump due to the absence of coolant to carry away generated heat.
Problems caused by low suction level (dry run):
- Damage to the mechanical seal.
- Leakage during operation due to seal damage.
- Breakage in the system’s shaft.
- Motor overheating, leading to insulation short-circuit and motor burnout.
Implementing protection systems that prevent pump operation without liquid is crucial. Solutions include float switches, level sensors, and electronic overload/underload relays, each with its advantages based on application requirements.
- Float Switches: When the liquid tank is empty, the float switch opens its internal contact, preventing the pump from operating.
- Level Sensors: These electrodes in the liquid tank are configured to halt pump operation when the liquid drops below a certain level and allow operation when the level increases. This prevents continuous starting and stopping, known as rapid cycling, which leads to overheating and motor burnout.
- Electronic Overload/Underload Relays: These devices measure the pump’s electrical power, inferring dry run situations without the need for electrodes or float switches. They offer additional protection against various common faults.
Nassar Electronics provides a range of equipment to prevent dry runs in pumps (low suction levels).
Explore our products:
- Overload/Underload Relays: Click here.
- Level Sensors: Click here.
- Float Switches: Click here.