Water was being pumped through a long hose that extended up a hill. Two workers noticed the pump had stopped discharging water, so they increased the throttle. When this did not fix the problem, they shut off the pump. One of the workers then started to unhook the quick connect coupling when the water pressure forced the hose off the pump. Hot, stagnant water splashed from the pump and burned him.
It is very important to ensure pumps remain primed. If a pump does not keep its prime, water can stagnate inside. Friction will cause the water temperature in the pump cavity to increase and cause water pressure to build. Below are some of the causes and solutions to pumps losing their prime:
Overheated pumps can cause severe damage to equipment, as well as serious injury and burns.
If the pump casing overheats: