Replacing a Pigtail

Today we will be going over a general procedure for replacing a high purity gas delivery system’s pigtail. However, keep in mind that specific systems may have variations in their design and components. Always follow the manufacturer's guidelines and adhere to safety regulations. Here is a basic procedure: 

Modified Procedure for Replacing a High Purity Gas Delivery System Pigtail: 

Materials and Tools:

1. Replacement pigtail

2. Wrenches or adjustable wrench

3. Safety gloves and goggles

Steps:

1. Safety Precautions:

   - Ensure that the gas supply is turned off at the source. 

   - Wear safety gloves and goggles to protect yourself during the replacement process. 

2. Identify the Gas Type: 

   - Confirm the type of gas being delivered through the pigtail. Different gases may have specific safety considerations and handling procedures. 

3. Turn Off Gas Supply: 

   - Close the main valve or shut-off valve on the gas supply line to isolate the system. This is crucial for safety during the replacement. 

4. Perform Purges 

   - Perform automated or manual purges. Generally, 40 dilution purges are sufficient. 

5. Disconnect Existing Pigtail: 

   - Use wrenches to loosen and disconnect the existing pigtail from both the cylinder/regulator and the system's inlet or distribution point. Be cautious of any residual gas. 

6. Inspect and Clean Connections: 

   - Inspect the threads and surfaces of the connections for any damage or contaminants. Clean if necessary. 

7. Connect the Replacement Pigtail: 

   - Attach the replacement pigtail to the cylinder/regulator and the system's inlet or distribution point. Use wrenches to tighten the connections securely. Avoid over-tightening. 

8. Check for Leaks: 

   - Turn on the purge gas supply and check for any leaks around the connections. Gross leak check is the recommended static. Generally, 80-85 psi for 6 hours. 

9. Purge and Stabilize: 

   - Purge the system of atmosphere by allowing a small amount of gas to flow through. Stabilize the system to ensure a consistent flow. 

10. Verify Pressure Settings: 

    - If applicable, verify that the pressure settings on the regulator match the requirements for the specific gas being delivered. 

11. Document the Replacement: 

    - Document the replacement date, serial number of the new pigtail, and any other relevant information for record-keeping purposes. 

12. Conduct System Checks: 

    - Perform any necessary system checks or calibrations to ensure proper functioning. 

13. Secure and Label: 

    - Secure the new pigtail in place and label it appropriately for easy identification. 

Always refer to the manufacturer's documentation for specific instructions related to your high purity gas delivery system. If in doubt or if you encounter issues, consult with a qualified technician or the system's manufacturer for assistance.