Abstract: During a water draw test, horizontal type bidirectional sphere provers with a straight calibrated section of pipe between the detector switches sometimes suffer from sphere launch failure which typically results in a failed water draw test. These types of provers, especially in larger pipe diameters will benefit from an elongate concentric fabricated reducer attached to the outlet of each launch tube. These elongate concentric fabricated reducers result in a successful sphere launch on the first attempt. Assuming all the other components of the prover are properly designed and assembled, a successful sphere launch will result in a successful water draw test on the first attempt saving time, money and reputation.

Abstract: During a water draw test, horizontal type bidirectional sphere provers with a straight calibrated section of pipe between the detector switches sometimes suffer from sphere launch failure which typically results in a failed water draw test. These types of provers, especially in larger pipe diameters will benefit from an elongate concentric fabricated reducer attached to the outlet of each launch tube. These elongate concentric fabricated reducers result in a successful sphere launch on the first attempt. Assuming all the other components of the prover are properly designed and assembled, a successful sphere launch will result in a successful water draw test on the first attempt saving time, money and reputation.

Abstract: A bidirectional sphere prover is used to check the accuracy of a custody transfer meter when fluids, such as crude oil or gasoline are bought and sold. The bidirectional sphere prover of the present invention uses a straight calibrated section of pipe between the detection switches, the straight calibrated section of pipe being free of welds, flanges and elbows.

Abstract: During a water draw test, horizontal type bidirectional sphere provers with a straight calibrated section of pipe between the detector switches sometimes suffer from sphere launch failure which typically results in a failed water draw test. These types of provers, especially in larger pipe diameters will benefit from an elongate concentric fabricated reducer attached to the outlet of each launch tube. These elongate concentric fabricated reducers result in a successful sphere launch on the first attempt. Assuming all the other components of the prover are properly designed and assembled, a successful sphere launch will result in a successful water draw test on the first attempt saving time, money and reputation.