Pumps and primers

Question 1

What are the characteristics of a centrifugal pumps?

Answer 1

• At any given speed, when there is no flow the pressure is at a maximum; it decreases as the delivery valves are gradually opened and the flow increases.
• When pump speed increases both pressure and flow increase.
• When suction lift increases both pressure and flow decrease.

Question 2

What are the types of primer used on both a major and light pump?

Answer 2

• Water ring - used on vehicle mounted pumps.
• Reciprocating primer - used on vehicle mounter pumps.
• Exhaust gas ejector - used on portable pumps

Question 3

What are the TWO main gauges used within the service?

Answer 3

• Pressure gauge

- Compound gauge