Flow Measurement Uncertainty

Flow measurement uncertainty is estimated using ASME PTC 19.1, and values are dependent on the test line. A generic statement of an uncertainty of 0.25% is used as a conservative guideline. When specific meters are calibrated, the test data may be used to estimate the actual uncertainty.  Best uncertainties are listed below for each weigh tank and the secondary standard.

Facility

Best Uncertainty

Allen 100,000# scale
Allen 10,000# scale
Allen 1,000# scale

Hooper 50,000# scale
Hooper 10,000# scale
Hooper 1,000# scale
Hooper Secondary Standard

0.10%

0.08%

0.08%

 

0.20%

0.20%

0.10%

0.50%