Balancing Pressures

It is equally as important to balance pressures in a water system when attempting to identify losses, as the system pressure plays a large part in water loss especially leakage as discussed later in this manual.

Usually, when we want to balance pressures we work out hydraulic grade lines (HGLs). Hydraulic grade is a sum of the ground level plus the static pressure at that particular point and the lines are the chosen points connected up. Most often in water loss control situations we will need to know

• The supply or inlet pressure

• Average zone pressure

• Critical point pressure

• Minimum service pressure required

• The number of hours the system is pressurized in cases where there is intermittent supply

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