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PP: Pumps And Pumping > PP 009: Lifting From Open Water > Flashcards

PP 009: Lifting From Open Water Flashcards

1
Q

How many BAR is atmospheric pressure?

A

1 BAR

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2
Q

What is the maximum theorirectal lift of water, in perfect conditions?

A

10m

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3
Q

Practically, what is the maximum lift of water that can be achieved?

A

8m due to the factors of OFPITA

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4
Q

What is OFPITA?

A

Overcoming inertia

Frictional loss

Pump entry loss

Imperfect vacuum

Temperature

Atmospheric pressure

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5
Q

What does overcoming inertia mean?

A

Getting the water moving by adding kinetic energy

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6
Q

Why does pump entry loss occur?

A

Due to the 90° angle at which the water enters the eye of the pump

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7
Q

How does temperature affect the maximum lift of water?

A

The higher the temperature, the more difficult it will be to lift the water. Due to water starting to evaporate

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8
Q

What is the name of the primer on all Mercedes appliances?

A

Automatic positive displacement reciprocating piston primer

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9
Q

What equipment is used when lifting from open water?

Seven answers

A 
Hard suction hose
Suction strainers
Strainer basket
Two suction wrenches
140-100mm adaptor
Short line
Salvage sheet
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10
Q

What is the length and diameter of the hard suction hose?

A

2.44m

100mm diameter

Capable of withstanding external pressure

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11
Q

What must be worn when working near water?

A

Full PPE and a personal flotation device (PFD)

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12
Q

Should the tank to pump switch be open or closed when lifting from open water?

A

Closed

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13
Q

What knots are used to secure the hard suction hose?

A

Clove hitch at the end with the strainer

Half hitches along the middle keeping it bent

Round turn and two half hitches at the appliance

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14
Q

How deep should the strainer be to avoid a vortex forming?

A

300mm

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15
Q

What does each -0.1 BAR represent on the compound guage?

A

1m of lift from open water

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16
Q

What does an increase in the vacuum reading on the compound guage indicate?
Four answers

A

Level of supply dropped (if tidal)

Suction strainer blocked

Branches open

Burst delivery hose

17
Q

What would a decrease in the vacuum reading on the compound guage indicate?
Three answers

A

Level of supply raised (tidal)

Branches being shut down

Slight air leak in suction side of pump

18
Q

If the pump fails to achieve a lift, and there is a very high reading on the vacuum side of the compound guage, what could this indicate?
Two answers

A

Blocked suction strainer

Faulty suction hose

PP: Pumps And Pumping (8 decks)

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