waterpump

  1. Dry Running Dry running is where a pump is operated without fluid. This means internal parts which often rely on the pumped liquid for cooling and lubrication are subject to high amounts of friction and heat leading to prompt failure. Failure can happen in seconds and so it is always import to ensure the pump is completely filled with fluid prior to operation. 2.   Chemical Attack Every material has its Kryptonite. If a liquid is incompatible with a fluid it can cause internal parts such as rubber seals, gaskets, impellers, pump casings and diffusers to crack, swell, contract or deteriorate. Chemical compatibility tables outline which materials are compatible with which fluids rating them from Good to Poor. Whenever frequent pump wear occurs, or should pump failure occur after a short amount of time- this is one of the first items which should be checked.  3.   Cavitation Pumps are controlled by the system they operate in. If not restrained they ca...

It is important to review how a pump mechanical seal works. First, its main components are the rotating and stationary face rings that form the primary seal (Image 1). The face rings have flat, precision-smooth contact surfaces that are held in tension against each other by mechanical springs. The rotating face ring and its assembly have to be sealed to the shaft. The stationary face ring has to be sealed to the housing. These two sealing points are called secondary seals and typically use elastomer O-rings or boots . Pump Seal Materials Selecting the proper materials for the primary and secondary seal components is important. For common water pumping applications, carbon-ceramic face material and Buna-N secondary seals are standard and work well. Alternate materials work better for pumping sewage or strong chemicals, so many technicians seek outside help on these applications.   Precautions Ensure Success By following a few precautions, it is not difficult to install pump ...