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VALVE FUNCTIONS AND BASIC PARTS

7 Jun

Valves are the most common single piece of equipment found in DOE facilities. Although there are many types, shapes, and sizes of valves, they all have the same basic parts.  This chapter will review the common parts and functions of a valve.

Introduction
A valve is a mechanical device that controls the flow of fluid and pressure [...]

POSITIVE DISPLACEMENT PUMPS

7 Jun

Positive displacement pumps operate on a different principle than centrifugal pumps.  Positive displacement pumps physically entrap a quantity of liquid at the suction of the pump and push that quantity out the discharge of the pump.

Introduction
A positive displacement pump is one in which a definite volume of liquid is delivered for each cycle of pump [...]

Preventing Cavitation

7 Jun

If a centrifugal pump is cavitating, several changes in the system design or operation may be necessary to increase the NPSHA  above the NPSHR  and stop the cavitation.   One method for increasing the NPSHA  is to increase the pressure at the suction of the pump.  For example, if a pump is taking suction from an [...]

CENTRIFUGAL PUMPS

6 Jun

Centrifugal pumps are the most common type of pumps found in DOE facilities. Centrifugal pumps enjoy widespread application partly due to their ability to operate over a wide range of flow rates and pump heads.

Introduction
Centrifugal pumps basically consist of a stationary pump casing and an impeller mounted on a rotating shaft.  The pump casing provides  [...]

HEAT EXCHANGER APPLICATIONS

6 Jun

Introduction
Heat exchangers are found in most chemical or mechanical systems.  They serve as the system’s means of gaining or rejecting heat.Some of the more common applications  are found in heating, ventilation and air conditioning (HVAC) systems, radiators  on internal combustion engines, boilers, condensers, and as preheaters or coolers in fluid systems.   This chapter will review [...]