What’s the biggest challenge you’ve faced with metering skids in custody transfer?

In liquid and gas custody transfer, we often see issues with calibration, changing fluid properties, and compliance with OIML/API standards.
From your experience—what’s the toughest part about implementing/maintaining a custody transfer metering skid?
(I work with a team that designs turnkey metering systems: Eximp Measurement). Always curious to learn from engineers.
 
Very interesting question. I am also working on the extensive PM of the natural gas metering skid; condensate and carryover heavy hydrocarbons disturb the readings. Maintaining a sample fuel gas stream in term of the sampling is not that easy.
 
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