Verticle Sump Pumps are best used for sump where submersible Pumps may not be applicable to high cost , if it is stainless steel material and submerisble cannot be used for HOT PIT , as the motor need cooling VSP Pump advantage is that the motor is mounted on top , visible for inspection and bearing failures noise can be observed. Unllike Submersible Pump, maintenance team dont take action unless the pump is not running , by the time it is too late. Mechanical seal will be damaged by then, water gets into the motor and complete overhaul , rewinding is needed which proved costly VSP has no mechanical seal installed ,designed with minimum maintenance in mind.
Semi Open or Fully Open Impeller Pumps for Sollid Handling up to 80 mm and als0 high visocisty fluids can also be used as Mixing application
Over the years , we usually come across User /Customer telling us give them a pump at X M3/hr at 6 bar or 8 bar, which sometime overestimated or guesswork without actual calculation. This resulted in over rated motor KW or oversized pump , which is wasteful in term of energy and pump size
Even , the working head is only 2.5 bar , customer specifiy much higher thinking it is better or as a safety factor
Not all engineers are fluid dynamics people , therefore it would be best a simple sketch showing piping diameter in the system and let pump suppliers work out the System Head closest to the requirement
user may consider Energy Efficient Drives / Motor , IE 2 or IE 3 , where many countries are phasing out IE 1 , with about 200 pumps in a palm oil refineries ,definitely much saving on energy cost
Operating with Frequency Invertors will also help a lot , that is supply as per demand .Not necessary for the Pumps to operate full load , especially in HVAC application ,There are hours where building is empty and coooling capacity can be reduced
Due to the frequent failures of Bearings, we had modify the single bearing to double bearing for better lifespan operation