Flow conditioning is one of the most critical aspects dealing with any type of volumetric flow metering. Flow
conditioning is the final buffer between the flow meter and the upstream piping layout and is responsible for eliminating
swirl, restoring flow symmetry and generating a repeatable, fully developed velocity flow profile. Even though modern
advancements have resulted in low uncertainty, high repeatability devices that are effective across a range of flow rates,
proper utilization of flow conditioner is still required to maximize the meters’ performance, diagnostics and ensure the most
stable long term flow measurement. All flow conditioner technologies are not made equal, as commonly used designs such
as AGA tube bundles and straightening vanes can actually cause more measurement problems than they resolve. This paper
will focus on two main types of flow conditioners; perforated plate systems and tube bundles.