An orifice assembly is described that has an orifice plate arranged in a non-vertical pipe section. The non-vertical pipe-section has a flow conduit having an inner wall defining a circular cross section around a longitudinal central axis, with an internal cross sectional area through which a fluid can flow in a flow direction along the flow conduit. The orifice plate is transversely disposed in the flow conduit. The orifice plate is provided with a single orifice arranged eccentrically within the circular cross section of the flow conduit.
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