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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 t

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.

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1. A pipe coupling, comprising: a hollow body defining a fluid entrance segment and a fluid exit segment; one and only one orifice plate disposed in the body between the segments and defining an orifice; a threaded upstream port between the plate and the fluid entrance segment; and a threaded

1. A pipe coupling, comprising: a hollow body defining a fluid entrance segment and a fluid exit segment; one and only one orifice plate disposed in the body between the segments and defining an orifice; a threaded upstream port between the plate and the fluid entrance segment; and a threaded downstream port between the plate and the fluid exit segment, the ports being configured for engaging respective flow rate metering connectors, wherein the coupling defines a longitudinal axis and the orifice defines a center distanced from the axis. 2. The coupling of claim 1, wherein the ports are formed in the body opposite the orifice relative to the axis. 3. The coupling of claim 1, wherein the ports are at least partially threaded. 4. The coupling of claim 3, wherein the segments are butt attachment segments. 5. The coupling of claim 4, wherein the butt attachment segments define a first wall thickness, and the body includes a port section defining a second wall thickness greater than the first wall thickness, the orifice being disposed in the port section, the ports being formed in the port section. 6. The coupling of claim 1, further comprising: an upstream flow rate metering connector threadably engaged with the upstream port; and a downstream flow rate metering connector threadably engaged with the downstream port. 7. The coupling of claim 6, further comprising a flow rate meter connected to the metering connectors. 8. The coupling of claim 1, wherein the body defines an outer surface and an inner surface, and each port defines a respective radially outer threaded segment extending to the outer surface and a radially inner smooth segment extending to the inner surface, the inner and outer segments of each port being coaxial with each other to establish the respective port. 9. A fluid flow rate metering device, comprising: one and only one orifice plate defining a center and an orifice offset from the center; a plastic pipe body holding the orifice plate, the body having opposed open ends and a cylindrical sidewall extending therebetween; threaded upstream and downstream sensor ports formed in the sidewall of the body upstream and downstream, respectively, of the orifice plate; at least one connector engaged with at least one port, wherein the ports are formed in the body opposite the orifice relative to the axis. 10. The device of claim 9, comprising a fluid flow rate sensor coupled to the at least one connector. 11. The device of claim 9, wherein the body defines a fluid entrance segment upstream of the orifice plate and a fluid exit segment downstream of the orifice plate. 12. The device of claim 11, wherein the ports are formed in the body opposite the orifice relative to the axis. 13. The device of claim 11, wherein the segments are butt attachment segments. 14. The device of claim 13, wherein the butt attachment segments define a first wall thickness and a first outer diameter, and the body includes a port section defining a second wall thickness greater than the first wall thickness and a second outer diameter greater than the first outer diameter, the orifice being disposed in the port section, the ports being formed in the port section. 15. The device of claim 9, wherein the body defines an outer surface and an inner surface, and each port defines a respective radially outer threaded segment extending to the outer surface and a radially inner smooth segment extending to the inner surface, the inner and outer segments of each port being coaxial with each other to establish the respective port.