| 主权项 |
1. A method for confirming the volumetric accuracy of a custody transfer meter using a 4-way valve to alternate a direction of the fluid flow through a bidirectional sphere prover comprising the following steps:
pushing a resilient single sphere through a first launch tube, through a first elbow, through a first U-tube in response to pressure from a first fluid flow from the 4-way valve; pushing the resilient single sphere from the first U-tube through a straight calibrated section of pipe having a first detector switch proximate a first end and a second detector switch proximate a second end, said straight calibrated section of pipe being free of flanges, lateral openings and elbows between the first detector switch and the second detector switch, said straight calibrated section of pipe having a first flange at the first end and a second flange at the second end; pushing the resilient single sphere from the straight calibrated section of pipe through a second U-tube, through a second elbow to a second launch tube; actuating the 4-way valve to reverse the direction of the first fluid flow through the bidirectional sphere prover; pushing the resilient single sphere from the second launch tube through the second elbow and through the second U-tube in response to pressure from a reverse fluid flow from the 4-way valve; pushing the resilient single sphere from the second U-tube through the straight calibrated section of pipe and past the second and the first detector switches; pushing the resilient single sphere from the straight calibrated section of pipe through the first U-tube, the first elbow back to the first launch tube to accomplish a first round trip of the resilient single sphere through the bidirectional sphere prover; and continuing to actuate the 4-way valve to alternate the direction of fluid flow through the bidirectional sphere prover to complete at least five round trips of the resilient single sphere which completes a prover run. |
