Tightening Primary Packing
Always tighten the primary packing before fluid runs through the lines following the construction pressure test. This ensures a secure seal and prevents any leakage during operation. At the first sign of a leak during plant operations, immediately tighten the packing to prevent more significant issues down the line. Additionally, take advantage of the annual plant maintenance shutdown to tighten the packing, ensuring the valves remain in optimal condition and reducing the likelihood of failures during regular operation. By addressing these maintenance steps proactively, you can minimize downtime and ensure the system operates smoothly.
Pocedure for Applying Pressure to Primary PackingFor Gate Valves:
1. Open the Valve Fully: Turn the valve counterclockwise to the full open position.
2. Stop Turning: Once the wheel reaches its limit, stop turning.
3. Release the Lock Nut: Free the stopper by releasing the lock nut.
4. Clamp the Packing: Turn the step top lever clockwise by 30 to 45 degrees to clamp the packing.
5. Restore the Original Position: Tighten the lock nut and place the stopper back into its original position to maintain the valve’s initial state.
For Globe Valves and Forged Valves (1 1/2″ and Smaller):
1. Open the Valve Fully: Turn the valve counterclockwise until it’s fully open.
2. Stop Turning: Once the wheel stops turning, stop.
3. Clamp the Packing: Continue turning counterclockwise by 30 to 45 degrees to clamp the packing.