1. A gas pipework is supplying liquefied petroleum gas (LPG) to a kitchen appliance. Based on the following information, calculate the gas flow rate and pressure loss. If the pipe diameter is changed to 15 mm, determine the respective pressure loss and comment on whether this is acceptable or not.

 

Appliance heat output = 15 kW

Appliance efficiency = 75%

Gross calorific value of LPG = 116 MJ/m3

Specific gravity of LPG = 1.91

Pipe diameter = 22 mm

Actual length of the gas pipe = 10 m

Allowances for pipe fittings = 4 bends x 0.4 m each

Design tolerance for the pressure loss = 1 millibar