UFC 3-460-03.pdf

UFC 3-460-03

10 November 2017

3-7.1.1 Inspection and Maintenance – Positive Displacement Meters

Component wear and accumulation of solids make periodic calibration necessary.

Certified master meters or volumetric prover tanks are used for calibration. Master meters must have been certified within a year of calibration operations. Master meters are tested at a predetermined flow rate. Master meters must be calibrated within ±10% of the normal operating flow rate through the inline positive displacement meter.

Volumetric prover tanks must have been certified within the last five (5) years of calibration operations.

A. Inspect counter head for unusual noises and smooth operation.

Frequency: Monthly

B. Positive displacement meters must be inspected and calibrated semi-annually or when improper performance is suspected; when unusual sounds or register actions develop; or after repairs have been made which may affect performance. Positive displacement meters are satisfactory when the measurement error in the normal flow direction is within ±0.3% of actual quantity delivered (e.g., ±1.8 gallons for a 600-gallon test (±6.8 liters for a 2275-liter test)). Adjustment of the meter’s register will be in accordance with manufacturer’s instructions. Identify the next calibration date on meters (example: Mar 14 for March 2014). Use weather resistant label that will remain legible and affixed for at least one year.

Frequency: Semi-annually or as required

C. Inspect temperature element operation of meters equipped with temperature compensation feature per manufacturer’s operation and maintenance manual.

Frequency: Semi-annually

3-7.2 Turbine Flow Meters

Turbine flow meters that meet the requirements of UFGS 33 52 43.11, Aviation Fuel Mechanical Equipment utilize an axially aligned rotor to measure fluid flow. Clearances between the rotor and housing allow some slippage which can reduce the accuracy of the flow meter.

Figure 3.4: Turbine Flow Meter