Road American
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Calibration typically includes verifying pump output versus control settings, checking spray bar nozzle flow rates, confirming transverse distribution uniformity, and validating application rate at different speeds. Contractors perform tray tests or paper tests under the spray bar to measure distribution and identify streaking. Nozzle wear, pressure stability, and bar height are checked because they affect fan overlap. The system’s rate controller is validated against measured volume sprayed over a known distance and width. Many QA plans require documentation of calibration before work and after nozzle changes or maintenance.
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