API TR 2578-2017 pdf download.Flow Conditioner Installation and Effects on Turbine Meters.
2 Discussion of Results Phase II testing was conducted with two liquids similar to light hydrocarbons. One liquid was 2 to 2.5 cSt and the other 13.5 to 15 cSt. Phase II testing replicated the results of Phase I testing on water. 2.1 Strainers If the basket changed position in the strainer body during operation (Figure 5), this affected the meter readings. We overcame the issue by bolting the basket to the basket ring in the body. 2.1.1 Strainer effects on flow profile and meter performance (performances and effects) are caused by: a) nozzle-to-body ratio, size (nozzle/body), exit nozzle velocity; b) basket movement during operation and consistent relocation on reinstallation after inspection; c) basket location in the strainer body (annular width between basket and body wall) with respect to outlet nozzle; d) debris on the basket wall; or e) exit nozzle fluid velocity.
2.1.2 The data from our testing shows that the larger the strainer inlet/outlet and body, the lower the variation in meter factor (MF) on proving runs. a) For the same nozzle size and configuration, a larger body/basket yielded slightly less variance in MF on the test runs. b) For the same body size, a larger outlet nozzle size gave noticeably less variance in MF on the test runs. c) The MF stability improves noticeably at strainer outlet nozzle velocities ≤ 15 fps, and is greatly improved ≤ 10 fps. d) Only conical or concentric reducers were used at the strainer nozzle outlet. e) The strainer basket being secured/fixed inside the body reduces the varying perturbations that the basket adds to the flow profile. 2.2 Flow Conditioners 2.2.1 Flow conditioner installation location has a considerable effect on performance. Users should always follow the OEM installation recommendations. 2.2.2 Tube bundles provided erratic flow conditioning performance. Water testing first demonstrated that tube bundles exhibited unacceptable results based on meter factor stability (Figures 6 and 7). 2.2.3 Similar meter deviations when testing with tube bundles were observed on the initial Phase II petroleum tests. Therefore, tube bundles were eliminated from all remaining petroleum testing that constituted the majority of the tests. 2.2.4 For all the remaining tests referenced in 2.2.3 (above), only high-performance flow conditioners were used. NOTE High-performance flow conditioners are defined as those that provide pseudo-fully developed flow in laboratory and field piping configurations.
3 Recommendations In all turbine meter applications, high-performance flow conditioners should be used to optimize meter performance. 3.1 Metering System Elements Strainer baskets should be as rigid as possible: 3.1.1 The strainer basket flange and perforated plate need to resist movement during operation. 3.1.2 Have a method to ensure exact placement in the strainer body when removed for cleaning and replacement. 3.1.3 For custody transfer measurement systems with turbine meters, straight pipe of 20D alone (or, for that matter, any length) did not demonstrate acceptable performance to be considered “flow conditioning.” 3.1.4 For custody transfer metering systems with turbine meters, tube bundles did not demonstrate acceptable performance and should not be considered high-performance flow conditioning. 3.1.5 Because position of the high-performance flow conditioner can affect the effectiveness, OEM recommendations for location of the flow conditioner should be followed. 3.1.6 Testing has indicated that additional API flow conditioning testing for other non-positive displacement meters should be considered. 3.2 Pipe Alignment and Flanges Correct-size gaskets, flange alignment, and pipe bore size should be used to ensure that there is no obstruction/restriction in the pipeline. -0.100% -0.080% -0.060% -0.040% -0.020% 0.000% 0.020% 0.040% 0.060% 0.080% 1 2 3 4 5 6 MF Variance with Obstruction Change Obstruction A through E + No Obstruction Meter Factor Variance at 80% of Meter Max Flow MF Variance with TB MF Variance with HP FC Linear (MF Variance with HP FC) 8