Lifting From Open Water

Question 1

List open water sources (6)

Answer 1

Rivers.
Canals.
Lakes.
Docks.
Swimming pools.
Wells.

Question 2

What is the maximum theoretical and practical lift

Answer 2

10m

8m

Question 3

Why can a theoretical lift not be achieved

Answer 3

Overcoming Inertia.
Frictional loss.
Pump entry loss.
Imperfect vacuum.
Temperature.
Atmospheric pressure.

Question 4

What does the primer do

Answer 4

Removes air from the pump

Question 5

What primer is used on Mercedes appliances

Answer 5

Automatic positive displacement reciprocating piston primer

Question 6

What equipment is used for lifting from open water

Answer 6

Hard suction hose.
Salvage sheet.
Suction wrenches.
Basket & strainer.
Short line.
140-100mm adaptor.

Question 7

How deep should the strainer be submerged.

Answer 7

3x the width of the diameter of the suction hose. 300mm

Question 8

Where is the lift measured from

Answer 8

Eye of the pump to the water level.

Question 9

What would be the height of lift if the reading on the compound gauge was -0,4

Answer 9

4m

Question 10

What would it suggest if the compound gauge went from -0,4 to -0,1.

Answer 10

Supply level raised.
Branches shut down.
Alight air leak on suction side of pump.

Question 11

What would it suggest if the compound gauge went from -0,1 to -0,4.

Answer 11

Level of supply dropped.
Suction strainer blocked.
Branches opened.
Burst delivery hose.

Question 12

What should you consider if the pump fails to prime.

Answer 12

Strainer not fully submerged.
Loose suction joints.
Open drain cock.
Delivery valve not seating correctly.
Air leak in suction hose.
Defective seal.
Serious leak in gauge pipes.
Defective primer.
Compound gauge damper closed.