Final answer:
The difference between the supply pressure and back pressure at the stated condensate load is called the pressure drop. During times of heavy use, there can be a significant pressure drop in the water main. This pressure drop can be calculated using the equation P2 - P1 = RQ.
Step-by-step explanation:
The difference between the supply pressure and back pressure at the stated condensate load is called the pressure drop.
When there is a heavy use of water, such as during peak demand, there can be a significant pressure drop in the water main. The pressure supplied to users (P1) is significantly less than the pressure created at the water works (P2).
This pressure drop can be calculated using the equation P2 - P1 = RQ, where P2 is the supply pressure, P1 is the back pressure, R is the resistance, and Q is the flow rate.