The American Petroleum Institute has published a correlation for determining the hydrocarbon emissions from fixed-roof storage tanks
Ly = (24/1000) * (p/(14.7-p))^0.68 * D^1.73 * H^0.51 * T^0.5 * Fp * C
where: Ly is breathing emissions, bbl/yr; p is the true vapor pressure at the bulk temperature, psia; D is the tank diameter, ft; H is the height in ft; T is the average tank outage corrected for roof volume, ft; Fp is the dimensionless paint factor; and C is the dimensionless adjustment factor.
Is this equation dimensionally consistent?
The Attempt at a Solution
I have a doubt with the (p/(14.7-p))^0.68 term. I think it should be dimensionless, but I am not totally sure as there is a 14.7 with no units minus a pressure in psia...