| 摘要 |
A metering pipe for a landfill well includes an upstream segment and a downstream segment. A coupling having an orifice plate positioned therein surroundingly engages both segments. Specifically, the segments are advanced into the coupling toward each other, on opposite sides of the orifice plate from each other. Upstream and downstream pressure ports are respectively formed through the walls of the upstream and downstream segments and the coupling adjacent the orifice plate. The difference in pressure at the ports is correlated to a flow rate through the pipe. To ensure that all gas flowing through the well also flows through the metering pipe, a compression coupling is disposed between the metering pipe and well. The compression coupling joins the metering pipe to the well and blocks gas flow past the outside of the metering pipe, while permitting the metering pipe to be selectively reciprocated relative to the well.
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