Strainers and filters.

DOE-STD-1161-2003

Volute

Lantern ring

Wearing rings (impeller and/or casing)

Discuss Bernoulli's Law as it applies to the design and operation of centrifugal pumps.

Discuss why centrifugal pumps should normally be started against a shut-off head and the

hazards associated with continuously running against a shut-off head.

Compare and contrast the principle of operation and typical pumped medium of the

following types of positive displacement pumps:

Reciprocating

Rotary-screw

Vane-axial

State the dangers to personnel and equipment associated with starting a positive

displacement pump against a shut-off head. Discuss the importance and methods of

providing over pressurization protection for positive displacement pumps.

Using the following list of system and/or pumped medium characteristics, identify which

type of pump (e.g., centrifugal, reciprocating positive displacement, rotary-screw positive

displacement) is best suited for the application.

Slurries

Fluids with high viscosities

Low volume, high head

Low head, high volume

Water

Oil

Discuss the concept of pump cavitation and describe its harmful effects.

12.

Mechanical systems personnel shall demonstrate a working level knowledge of strainers and

filters.

Supporting Knowledge and/or Skills

Compare and contrast the design, operating characteristics, and applications of filters and

strainers.

Describe the following types of strainers and filters, including an example of typical use

for each:

Electrostatic filters

Cartridge filters

Precoated filters

Bucket strainers

Deep-bed filters

High Efficiency Particulate Air (HEPA) filters

Duplex strainers