Category: Hydraulic Institute
-
NPSH: Know the Consequences of Disregarding Facts
Process pumps are machines that take liquid from a suction condition to a discharge condition. In its typical form, there usually is a shaft-mounted impeller (or impellers) that, together, make up a rotor. Impellers impart velocity to the fluid as it passes from pump suction to pump discharge. Whereas in the pump casing’s internal passageways,…
-
Valves’ Effect on Flow Rate & Water Hammer
Not all valves are well suited for controlling system flow rate. Overall, the performance and characteristics of each valve will affect the magnitude of any transients developed by valve closures and openings. It is important to consider rate of flow change versus valve position and control the closure rate of the valve such that the…
-
How Centrifugal Pumps Work
A centrifugal pump is a type of rotodynamic pump that uses bladed impellers with essentially a radial outlet to transfer rotational mechanical energy to the fluid primarily by increasing the fluid kinetic energy (angular momentum) and increasing potential energy (static pressure).
-
How will pump efficiency be affected with variable speed drives?
By Hydraulic Institute Q How much will pump efficiency be affected with the addition of a variable speed drive? A It is a misconception that adding a variable speed drive (VSD) to a pump will increase its efficiency. When considering the wire-to-water efficiency of the pump, motor and VSD, each component that is added lowers…
-
Standards for Fossil Power Plant Pumps
Q What standards are applied to fossil power plant pumps? A Specifications for power plant pumps will invoke many standards and requirements that will vary based on the specifier. A specific design standard is not applied.
-
Flexible Couplings Alignment & Pumps in Explosive Atmospheres
HI Pump FAQs® is produced by the Hydraulic Institute as a service to pump users, contractors, distributors, reps and OEMs.
-
What is a centrifugal pump?
A centrifugal pump is a type rotodynamic pump, and not all rotodynamic pumps are centrifugal pumps.
-
Pump Bearings & Housing Seal Lubrication – By Hydraulic Institute
Horizontal & vertical centrifugal pump seals