A needle pressure gauge is used to measure the actual pressure at the nozzle of a blast hose by inserting the needle into the blast hose at a specific angle and location.
Step-by-step guide for using a needle pressure gauge:
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Position the Needle: Insert the needle into the blast hose at a 45° angle, approximately six inches (150mm) behind the nozzle holder.
- Ensure the tip of the needle is pointing toward the nozzle.
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Depth of Insertion: Push the needle far enough into the blast hose so that the tip is positioned directly in the center of the air stream.
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Read the Gauge: Once the needle is correctly positioned, the gauge will display the actual pressure at the nozzle.
Important Notes:
- Accuracy: This method provides a more accurate reading of the working pressure at the nozzle, which is crucial for optimizing blasting efficiency.
- Safety: Always handle the gauge and blast hose with care, ensuring proper safety procedures are followed.
Using a needle pressure gauge correctly allows for precise measurement of nozzle pressure, which is essential for effective abrasive blasting operations.
