Note that the difference between the boiler feed pump head-flow curve and the system resistance curve (Figure 1) provides the basis for the pressure drop available for the drum level control valve.

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Simply put, pump net positive suction head (NPSH) is the excess head (or pressure) exerted on the pump’s suction that keeps the liquid from boiling.

The actual pressure at pump suction then corresponds to deaerator pressure of 59.45 psi + 34 psi (where 34 psi equals the static head minus friction loss) = 93.45 psi.

In heat mode, a dirty air filter causes low airflow across the condenser. This can cause extremely high head pressure. In heat mode, a dirty outdoor coil can cause a low suction pressure. As an ...

Some advice when choosing the most suitable dewatering pump is not to confuse the concepts of head and pressure, according to Steve du Toit, rental development manager at pump and dredging ...

Read about Diesel Power Magazine's close up look at how the Stanadyne DB2 Injection Pump works (previously known as the Roosa Master).

BEYOND BACK-TO-BASICS: PROCESS PRINCIPLES AND CONCEPTS-3: Maintaining seal-flush pressure in centrifugal pumps Centrifugal pumps are the most common pumps in a process plant.