A commercial laundry equipment running on liquefied petroleum gas $($LPG$)($with a calorific value of $116$ MJ$/$m$3)$ has a heat output of $40$ kW and an efficiency of $70\%.$ Determine the flow rate of LPG required for the appliance. Given the following data and information, calculate the pressure loss of the gas pipe. Also, describe the different methods for arranging a LPG supply system in buildings