Q

tan e/2

where Q' = liquid flow, m3/s per serration 8 = angle of serration, deg

where q = liquid flow, m3/s dw = weir diameter, mm

For most sieve and valve trays, the hydraulic gradient is small and can be dropped from Eq. (14-108). Some calculation methods are

TABLE 14-11 Rvw Values for Eq. (14-104)

Valve type

Sharp

Venturi

Three-leg Four-leg Cages (no legs)

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