Page 145 - Electrical Installation in Hazardous Area

Calculation of release rates and extents 11 1

Fig. 4.3 (Reynolds Number R0.* against pool area)

This gives a pool area as follows:

A = 5.65 x lo2 a [q(P - 105)]0.5 Ro.2 rp M m2 (Equation 4.23)

The equation for extent of the hazardous area is again empirical and is:

X = 1625 Q/LEL(mixture) x source length]'.'4 m (Equation 4.24)

From Equation 4.19 the volume release of gas is as follows:

AP
Q~ = 1.64 x ~o-~A T/RO.* m3 /s