Rotary gas meter with flange connection
AssigneeRomet Limited
InventorsAndrew Smich, Xinmin Wang, Bong Joo Lee
Life of this patent
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Abstract
A gas meter with a rated maximum flow capacity of greater than 3,000 CFH (Cubic Feet per Hour)—for example, between 3,500 CFH and 7,000 CFH—is provided with 2-inch flange connectors. One or more undercuts are provided in the meter body to promote satisfactory performance in terms of, for example, differential pressures at the meter inlet and outlet.
Claims17
A method to replace a first rotary gas flow meter having a first flow rating in cubic feet per hour, the first rotary gas flow meter having respective ports to connect to inlet and outlet flange connections that have a diameter associated with the first flow rating, the method comprising:
- providing a second rotary gas flow meter for direct connection to the inlet and outlet flange connections in place of the first rotary gas flow meter, the second rotary gas flow meter comprising:
- a meter body having a main chamber,
- an inlet port in communication with the main chamber via an inlet antechamber, the inlet port having a cylindrical profile,
- an opposing outlet port in communication with the main chamber via an outlet antechamber, the outlet port having a cylindrical profile, and
- wherein:
- the inlet port and the opposing outlet port connect respectively with the inlet and outlet flange connections without resizing or adapting the diameter;
- and
- each of the inlet antechamber and outlet antechamber having a pair of opposing undercuts extending longitudinally with the cylindrical profiles of the inlet and outlet ports, each undercut having a parabolic profile transverse to the cylindrical profile of its respective inlet or outlet port, the undercuts providing increased flow area through the meter body, the second rotary gas flow meter having a second flow rating that exceeds the first flow rating.
A rotary gas flow meter system, comprising:
- a rotary gas flow meter having a flow rating in cubic feet per hour, the meter comprising:
- a meter body having a main chamber;
- an inlet port in communication with the main chamber via an inlet antechamber, the inlet port having a cylindrical profile;
- an opposed outlet port in communication with the main chamber via an outlet antechamber, the outlet port having a cylindrical profile;
- and
- each of the inlet antechamber and outlet antechamber having a pair of opposed undercuts extending longitudinally with the cylindrical profiles of the inlet and outlet ports, each undercut having a parabolic profile transverse to the cylindrical profile of its respective inlet or outlet port, the undercuts providing increased flow area through the meter body;
- and
- an inlet flange connection and an outlet flange connection for directly connecting with the inlet port and outlet port respectively,
- wherein the flange connections have a diameter smaller than a diameter associated with the flow rating of the meter.
Dependencies are inferred from the claim text.