Flow metering device for landfill gas extraction well

摘要

A coupling having an integral orifice plate engages upstream and downstream segments of a landfill piping system. Upstream and downstream ports are respectively formed through the walls of the coupling adjacent the orifice plate. The difference in pressure at the ports is correlated to a flow rate through the pipe. Sensor fittings are threadably engaged with the ports, and to support the threadable engagement, the wall of the coupling through which the ports are formed has a thickness of at least around one-half inch.