Pumping - Pressure Loss Calculations

Front 1

What factors affect pressure loss?

Back 1

1) Internal diameter of hose

2) out flow of water

3) height in metres above or below water source

4) length of hose line l

Front 2

Loss of pressure is governed by what laws?

Back 2

1) Pressure loss is directly proportional to the length of the hose through which water flows

2) the longer the hose lines, the greater the frictional loss

3) pressure loss is directly proportional to the square of the flow rate

4) if the flow rate through a line of hose is double, the pressure loss due to friction will increase by a factor of 4

5) Pressure loss is inversely proportional to the hose diameter

Front 3

Fill in the blanks

Frictional loss in 45mm hose is approximately (blank) times greater than 70mm hose and (blank) times greater than 90mm hose for the same flow rate

Back 3

1) 5

2) 32

Front 4

How much pressure, in bar, does a 45mm hose with a delta branch set at 400lpm lose?

Back 4

1 bar

Front 5

How much pressure loss does a 70mm hose lose per length when working at 400lpm?

Back 5

0.2 bar

Front 6

How much pressure is lost when a branch is working 10m above pump level?

Back 6

1 bar

Front 7

How much pressure is gained by the branch working 10m below pump level?

Back 7

1 bar

Front 8

How much pressure is lost by a 45mm hose when working at 130/230 lpm?

Back 8

0.3 bar per length

Front 9

How are fire ground calculations of pressure losses rounded up or down?

Back 9

Pressure losses of less than 0.5 bar can be ignored and losses of 0.5 bar and above are rounded up to 1 bar

Front 10

What happens to pressure loss of hose lines are twinned?

Back 10

The amount of pressure lost to friction is quartered