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N°4 – Pipe head loss chart training – A level

Pipe sizing (Closed circuits) N°4 – Pipe head loss chart training – A level

Please study the Pipe head loss chart below:

pipe head loss chart with unite head loss in abscissa and flow rate in ordinate

Question  

Study carefully the flow rate scale.
On the flow rate axis, identify the flow rate of 0.1 [m³/h] (0.44 USgpm).
Note on its right the number 2 which corresponds to 0.2 [m³/h] (0.88 US gpm).
On the flow rate axis, identify the flow of 10 [m³/h] (44 US gpm).
To what flow rate does the number 2 correspond, situated on the right of the flow of 10 [m³/h] (44 US gpm)?
It corresponds to 20 [m³/h] (88 US gpm)It is necessary to take into account the reference values which are powers of 10 (10-1 = 0,1 ; 100 = 1 ; 101 = 10 ; 102 = 100 ; …) ; the value obtained is thus: 2 x 10 = 20 [m³/h].

Question  

Study carefully the head loss chart
– what is the head loss unit?
– refer to the value of 10 [daPa/m]. What head loss (in [daPa/m]) corresponds to the value indicated 2, just below?
– Unit: [daPa/m] or [mmCE/m]
– 2 means 20 [daPa/m]It is necessary to take into account the reference values which are powers of 10 (10-1 = 0,1 ; 100 = 1 ; 101 = 10 ; 102 = 100 ; …) ; the value obtained is thus: 2 x 10 = 20 [daPa/m].

Question  

Using the head loss chart above, indicate the maximum flow that is reasonable to transmit through the pipes, according to their DN (for a maximum of 20 [daPa/m]).
By reading the chart, we obtain:
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