Tech Note 10 - AGA Report No. 9 Now Allows Calibrating USMs with Laboratory Piping

Beginning with the 2007 version of AGA Report No. 9 (also known as AGA 9), flow calibration has been required for all fiscal applications when using gas ultrasonic meters (USMs). Traditionally the meter, along with the associated piping and flow conditioner (called the Metering Package in AGA 9), has been sent to the laboratory to be calibrated as a single unit. For small line sizes, the added cost of shipping all the piping components with the meter isn’t significant.

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