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DOE-STD-1176-2004
b.
Discuss the following with respect to probability and statistics:
Standard Deviation
Mean/median/mode
Variance
Sample size/frequency
Error analysis
11.
Chemical Processing Personnel shall demonstrate a working level knowledge of
pump theory and operation.
Supporting Knowledge and/or Skills
a.
Define the following terms as they relate to pumps:
Head
Net positive suction head
Shut-off head
Run-out
Centrifugal pump
Positive displacement pump
b.
Describe the general principle of operation for centrifugal pumps.
c.
Describe the general principle of operation for positive displacement pumps.
d.
Using a cutaway drawing of a centrifugal pump, identify the following
components and discuss their purpose:
Impeller
Packing or mechanical seal
Volute
Lantern ring
Wearing rings (impeller and/or casing)
e.
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.
f.
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.
12


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