Question

Which one of the following conditions must NOT be satisfied in the Hardy-Cross analysis of pipe network?

• A. Continuity principle demands that flow into a network junction is equal to the flow out of it.
• B. Momentum equation must be satisfied so that the force in each loop is balanced.
• C. Darcy-Weisbach head loss equation is to be used in computing head loss in elementary circuits. The equation is of the form $h_L=K{Q}^n.$
• D. $\sum h_L=\sum k{Q}^n$ must be equated to zero. If not, a flow correction factor $△$Q is to be made for arriving at a solution.
  

Answer 1

The correct option is B Momentum equation must be satisfied so that the force in each loop is balanced.

It is necessary to satisfy continuity equation. The loss of head due to flow in clockwise direction must be equal to the loss of head due to flow in anticlockwise direction.

Darcy-Weisbach equation must be satisfied

$h_f=k{Q}^n$