Vmax = K1 + K2HT
Where:
Vmax = Maximum permitted velocity, m/sec (ft/sec).
HT = Net heating value of the gas being combusted, MJ/scm (Btu/scf).
K1 = 8.706 m/sec (metric units) = 28.56 ft/sec (English units).
K2 = 0.7084 m4/(MJ-sec) (metric units) = 0.087 ft4/(Btu-sec) (English units).
Where:
K = Conversion constant, 1.740 * 10-7 (g-mole)(MJ)/(ppm-scm-kcal) (metric units) = 4.674 * 10-6 [(g-mole)(Btu)/(ppm-scf-kcal)] (English units).
Ci = Concentration of sample component "i," ppm
Hi = net heat of combustion of sample component "i" at 25 °C and 760 mm Hg (77 °F and 14.7 psi), kcal/g-mole.
%VL = (VL / VT) * 100
Where:
%VL = Percent leaking valves.
VL = Number of valves found leaking.
VT = The sum of the total number of valves monitored.
40 C.F.R. §60.485a