# N°6 – Maintaining water flow training – level 2

Maintaining water flow supposes to consider that water consists of molecules which move in a pipeline more or less in the same way as cars circulating on roads when congested.

#### Question

Determine, in [m³/h] the flow rates at points A, D and E.
Determine in [l/h] the flow rates requested by a “?”  #### Question

Working from right to left, determine in [l/h] the flow rates.  With current installation diagrams the pipelines are represented in a single line as below.

#### Question

Working from right to left determine in [m³/h] the flow rates in each section of the pipeline:
– Pipeline CA (returnBD) : together makes up the section CA – BD
– Pipeline EC (return DF): together makes up the section EC – D
– Pipeline GE (return FH): together makes up the section GE – FH – Pipeline CA (return BD): together makes up the section CA – BD
25 [m³/h] + 35 [m³/h] = 60 [m³/h]

– Pipeline EC (return DF): together makes up the section EC – DF
25 [m³/h] + 35 [m³/h] + 30 [m³/h] = 90 [m³/h]

– Pipeline GE (return FH): together makes up the section GE – FH
25 [m³/h] + 35 [m³/h] + 30 [m³/h] + 20 [m³/h] = 110 [m³/h]

#### Question

Determine in [m³/h] the flow rates in the sections.
– Section CA – BD
– Section direct CD
– Section EC – DF – The section CA – BD = 15 [m3/h] + 25 [m3/h] = 40 [m3/h]
– The section CD = 80 [m3/h] – (23 [m3/h] + 25 [m3/h] + 15 [m3/h]) = 17 [m3/h]
– The section EC – DF = 17 [m3/h] + 25 [m3/h] + 15 [m3/h] = 57 [m3/h]

#### Question

Determine in [m3/h] the flow rates in the sections.
– Section direct AB
– Section direct CD
– Section EC – DF – The flow rate in the direct section AB = 35 [m3/h]
– The flow rate in the direct section CD = 30 [m3/h]
– The flow rate in the section EC – DF= 90[m3/h]