KAM Simple Precision
 
Whitepaper: Laboratory testing for KAM LRW Low Range Watercut Meter for custody transfer / BS&W

Introduction

KAM LRW Low Range Watercut Meter

KAM LRW Low Range Watercut Meter

This paper summarizes analysis of the results of multiple laboratory tests for the KAM LRW Low Range Watercut Meter. The meter uses a microwave resonance technology, new to the KAM product line up. Tests were conducted both as a part of in-house product development and live customer demonstrations. The chief goal was to understand the accuracy of the technology at different water percentages and across different calibrated ranges for the unit.

Test method

Tests were conducted at the KAM factory using a flow loop with an LRW placed vertically in line. Mixing was generated via the circulation pump and mixing elements incorporated into liquid vessel. Tests were conducted with dry motor oil (5w-30) and diesel. Known quantities of water, measured with a graduated cylinder, were added sequentially to accumulate desired percentages of water within sample fluid at predetermined levels. Results were recorded at each test point once the fluid became well mixed within the flow loop. Results were presented as absolute error (calculated water percentage vs LRW reading) and total error (calculated water percentage plus uncertainty associated with manual volumetric measurement of the water vs LRW reading).

Factory test data

Conclusion

In all cases, the LRW performed better than stated accuracy with a maximum differentiation off total error of 0.043% on 0-5% models and 0.027% on 0-3% models. Meter sensitivity to water change was nearly instantaneous and readings were extremely stable once fluid achieved homogeneity.
The high accuracy and consistency of LRW provides a better solution for BS&W measurement, in particular in custody transfer situations, including automatic ticketing where it is key to minimize overall system uncertainty.
Morever, the microwave technology used has a linear relationship to changes associated with density, allowing for a straightforward correction to any change in density when density readings are fed to the LRW, generally from a mass flow meter. This is key factor in truck unloading stations seeing large changes in density from batch to batch. These differences can be as great as batches in the low 20s to batches in the 60s API gravity.

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