operating head of a pump(a pump’s flow-rate at varying heights; the amount of water a pump will produce falls as the head increases; the higher the pump has to push the water, the lower the flow-rate at the outlet)
NPSHR(net positive suction head required – определяется поставщиком при проведении испытаний с использованием воды в качестве перекачиваемого агента Seregaboss)
