Question

Fluid is flowing through the following 1 in fittings; 3 threaded sells, 6 tests, 7 globe valves, and 9 unions. If the head loss is 7.2 ft, what is the velocity of the liquid?

Answer 1

Fluid head loss through a fitting can be calculated by the following equation

where,

(ie, pressure loss in terms of fluid head)

K is the loss coefficient for various fittings

V is the average fluid velocity

g is the acceleration due to gravity ()

The fittings and their number are as given below

• Threaded ell - 3 Nos.
• Tee - 6 Nos.
• Globe valve = 7 Nos.
• Union = 9 Nos.

Standard loss coefficients are as given below

• Threaded ell = 1.5
• Tee = 0.8
• Globe valve = 8.5
• Union = 0.085

Therefore, total loss coefficients for various fittings is given by

Therefore from equation (1)