The orifice meter is a device for measuring the rate of flow of liquid and gas through a pipe. Typically, it consists of a flat circular plate which has a circular sharp-edged hole called orifice, which is concentric with the pipe. In chemical process design, an orifice is usually sized for known flowrate and presure drop. For liquid flow, the commonly applied equations are:
where
d = orifice diameter, inch
CD = maximum allowable vapor velocity ≈ 0.62
D = pipe inner diameter, inch
Δp = pressure differential, psia
W = full-scale upstream mass flow rate, lb/s
ρ= upstream liquid density, lb/ft3
No comments:
Post a Comment