Suppose the nozzle in example 4.4.1 is connected to the pipe by flange bolts of 1-cm diame...

Suppose the nozzle in example 4.4.1 is connected to the pipe by flange bolts of 1-cm diameter. If the allowable tensile stress in the bolts is 330 N/cm2, how many bolts are required for a safe connection?

EXAMPLE 4.4.1

The nozzle has the dimensions shown in Figure 4.4.2. What is the force exerted on the flange bolts for a flow rate of 0.08 m3/s? The upstream pipe pressure is 75 kPa.

SOLUTION

Using equation (4.4.3) yields

where F1 = p1A1 and F2 = p2A2 = 0 (because this end of the nozzle is open to the atmosphere and p2 = 0):

where 1 Pa = 1 N/m2 and 1 kg/m3 = 1 N-s2/m4, so

Figure 4.4.2 Nozzle for example 4.4.1.