Last month, we discussed how a constant volume heating, ventilation and air conditioning (HVAC) system would continually pump the same flow rate of chilled water through the entire system regardless of the cooling load.
A recent question I received from an engineer in the Middle East had to do with a “double control” of boiler feed pumps (BFPs) at his power plant. The system was controlled both by set position of the valves as well as variable speed drives. I was intrigued.
Entrained air is typically measured by volume at atmospheric pressure and not by weight. While not a totally inclusive list, the following are the most common reasons for air entrainment in pump systems:
I always start my columns saying every element found in a piping system falls into one of three categories: pump, process and control. The secret to understanding any piping system is to have detailed knowledge of the various pieces of equipment and how they work together.
Seal failures are the number one headache for many operators when it comes to pump reliability concerns. However, these failures are usually indicators of an underlying issue. Seal failure is rarely caused by a problem with the seal’s design or a fault during seal or bearing production.