Lifting From Open Water

Question 1

Examples from when lifting from open water may have to happen?

Answer 1

When hydrant supply is insufficient

When there is no hydrant supply

Question 2

What is the theoretical maximum hight water can be lifted?

And what is the maximum practical height it can be lifted?

Answer 2

10m

And

8m

Question 3

What factors effected the maximum lifting height of 10meters to be achieved?

Answer 3

OF PITA

Overcoming inertia (getting water moving initially)

Friction loss (in hard suction hose)

Pump entry loss (water reaching impeller)

Imperfect vacuum

Temperature. (Warmer the water, the harder to lift)

Atmospheric pressure. (Higher you are, the less atmospheric pressure pushing down on water forcing it up hose)

Question 4

Atmospheric pressure at sea level?

Answer 4

1 bar

Question 5

What is a primer, in a centralfugal pump?

Answer 5

A device that can pump air and gas.

Question 6

How far below the surface much a strainer be?

Answer 6

At least 300mm (3 times hose diameter)

Avoids sewing air into hose

Question 7

Safety considerations when pumping from open water?

Answer 7

All staff made aware of dangers

Personal floatation devices to be worn if any risk of falling in

Make sure appliance is on safe ground

Make allowances if pumping from tidal source

At night set up lighting

Open water can be source of disease.

Clean any contaminated equipment

Question 8

What does a reading of 0.3 bar on vacuum side of compound gauge indicate?

Answer 8

A lift of approx 3 meters.

0.1 bar for every meter on compound gauge

Mesured from eye of impeller inlet to surface water. (Not hose under water)

Question 9

Causes of compound gauge showing a decreased vacuum reading?

Answer 9

Level of supply raised. (Tidal)

Branches closing

Slight air leak on suction side of pump. (In hard suction hose)

Question 10

Causes of compound gauge showing increase in vacuum pressure?

Answer 10

Water source dropping. (Tidal, or supply used up)

Suction strainer blocked

Branches opening. (Pump working harder)

First delivery hose

Question 11

If the pump fails to achieve a lift, and NO reading on vacuum side of compound gauge, what should be considered the reasons why?

Answer 11

Suction strainer may not be submerged enough

Loose or faulty suction joints

Open drain plug on pump casing

Delivery valve not seating correctly

Air leak in suction hose

Defective seals

Serious leak in pipes or connections to gauges

Defective primer

Compound gauge damper closed. (Not working correctly)

Question 12

Pump fails to achieve lift and a very HIGH reading on compound gauge causes?

Answer 12

Blocked suction strainer

Faulty suction hose

Question 13

Which pumps can be used to lift from open water?

Answer 13

LLP light portable pump

Mercedes fire appliance. Godiva World Series

Question 14

What is a salvage sheet?

Answer 14

Placed between bank and had suction hose to prevent damage

Question 15

What type of primer does a Godiva World Series pump have?

Answer 15

Automatic positive displacement reciprocating piston pump

Question 16

OF PITA?

Answer 16

Over coming inertia. (Water going form station to moving)

Friction loss

Pump entry loss. (Water reaching impeller)

Imperfect vacuum. (Lots of components etc)

Temperature. (Hot water is harder lift, can out lift ice)

Atmospheric pressure. (Less atmospheric pressure at a higher height)

Question 17

Type of primer on Godiva World Series?

Answer 17

Automatic positive displacement reciprocating position primer

Question 18

How can engagement of the primer be easily recognised?

Answer 18

Chattering noise

Question 19

Describe the hard suction hose?

Answer 19

2.44 m long
100mm inner diameter

Connected using threaded couplings

Made to withstand external pressure.

Fitted with internal washer at female end

Question 20

What is the 140-100 adaptor?

Answer 20

Adaptor that allows the 100mm suction hose to connect to 140mm pump inlet

Question 21

What position should the tank to pump switch be in when lifting water?

Answer 21

Closed.

Other wise large amounts of water will flow out of pump inlet when cap is removed

Question 22

All deliverers and hosereel switches must be closed before lifting water.

Answer 22

.

Question 23

What is the most important factor in obtaining and keeping a lift?

Answer 23

Preventing air from getting into hose or pump.

Crackling jets can indicate a small amount of air that has gotten into hose then pump.

Question 24

What would a reading of -0.1 indicate on compound gauge?

Answer 24

Lift of one meter.

Max is 1.0 (10m lift)

Question 25

If more jets were opened and being used whilst lifting water, what would the compound gauge show?

Answer 25

An increased reading. -0.1 to -0.2 for example.

Pump is working harder

Question 26

What is priming?

Answer 26

Removing air from suction hose and pump, creating a vacuum to remove atmospheric pressure from hose, allowing water to be lifted.