The value of M=25.8 (65%CH4 and 35%CO2), universal
gas constant(R) =8.314J/mole K, temperature (T) =298K
(250C) density of biogas (r) =1.15Kg/m3, hence P=1.1bar
Piping: The piping system connects the biogas plant
with the gas appliances or users. It should be safe,
effectively gas-tight and allow the required gas flow to the
appliances during the life span of biogas plant. In this paper,
it is recommended to use polyvinyl chloride (PVC) pipe
that are economical.