• Confirm that the appliance is rated and approved for the fuel type and pressure available at the installation site.

• Ensure gas supply is turned off prior to connecting or modifying gas piping.

• Visually inspect all connections, fittings, piping joints, and factory-mounted components for signs of damage, improper thread engagement, or cross-threading.

• Pressurize the System: After all piping and fittings are connected and the appliance is installed:

  1. Slowly open the gas shutoff valve to pressurize the system.

  2. Do not energize or light the appliance during the leak test.

• Check for Leaks Using Two Methods:

  1. Soap Bubble Solution Test

     • Apply a commercially available gas leak detection solution to all:

       • Piping joints

       • Fittings and unions

       • Valve connections

       • Appliance inlet connections

       • Factory gas component seams (gas valves, manifolds, etc.)

     • Look for bubbling or foaming, which indicates a gas leak.

     • If bubbles are detected:

       • Mark the location.

       • Shut off the gas supply.

       • Disassemble the leaking joint, inspect for cross-threading or damage, reapply approved pipe sealant or tape, and reconnect.

       • Retest after reassembly.

  2. Electronic Gas Leak Detector

     • Use a calibrated combustible gas detector approved for natural gas or propane.

     • Slowly scan all joints, connections, and appliance internal components.

     • A sustained audible or visual signal confirms a leak.

     • Verify any electronic detection by rechecking with the soap bubble solution.

• • Inspect the appliance for leaks beyond the field piping:

    • Test gas valve body seams, pressure regulators, burner manifolds, and internal tubing.

    • Use both soap solution and electronic detector.

    • If a leak is detected in a factory component:

      1. Do not attempt to repair the sealed component.

      2. Contact the appliance manufacturer immediately for guidance or initiate warranty replacement procedures.

      3. Tag the unit “Do Not Use” and isolate it from the gas supply.

• If the system continues to detect gas but the exact location is unclear:

  1. Shut off the gas supply immediately.

  2. Ventilate the area- open doors/windows to disperse gas accumulation.

  3. Use leak detection methods again in a controlled and systematic manner.

  4. Call a supervisor or qualified gas safety expert for further evaluation.

  5. If no external leak is found, consider:

     • Microscopic cracks in appliance castings or manifold

     • Leaks under fittings or bushings that appear sealed externally

• • Once all repairs are made and no leaks are detected:

    1. Retest the full gas piping system and all connections using both methods.

    2. Observe the system for a minimum of 5 minutes with no detection before proceeding.

    3. Proceed to lighting and operation only after final clearance.

    4. Monitor appliance startup for any unusual odors, sounds, or irregular flame behavior.

Scenario Overview:

During a recent installation, a technician detected a gas odor while completing a job. Upon investigating, he found a leak in an existing appliance, which he assumed was the only issue. However, he did not verify 100% leak-free conditions before completing the project. Gas was turned on despite lingering doubt.

This led to:

• A significant and undetected leak in the newly installed appliance

• Gas accumulation to hazardous levels

• Emergency shut-off by the gas utility

• Full building evacuation and shutdown of business operations

• Hours of re-inspection by external authorities

• Damage to the client’s trust and the company’s reputation

Key Takeaways & Corrective Procedure

1. Never Proceed Without 100% Leak-Free Confirmation

• If you smell gas or suspect a leak:

  • You must not proceed with startup or leave the job site without confirming:

    1. 1. All piping is sealed and passes bubble and electronic leak detection

       2. All appliance connections are secure and verified

       3. There is no lingering gas odor

• “Assuming the source is found” is not acceptable.

2. If You Can’t Isolate the Source or Eliminate the Odor

• Shut off the gas supply immediately.

• Ventilate the area.

• Contact your field supervisor or lead installer for escalation.

• Clearly tag the appliance and gas supply as "DO NOT USE" until the leak is found.

• Notify the property owner or manager that additional testing is required and that the unit must remain off until cleared.

3. Stop Work if Needed

• A delay in completing an install is always safer and more professional than risking a hazardous condition.

• Communicate to the office or dispatcher:

  • The need for extra time

  • The safety hold on gas connection

  • That a return visit may be needed after a full diagnosis

4. Company Policy Enforcement

• Technicians who bypass this safety protocol:

  1. May be subject to corrective action or retraining

  2. Must review this procedure with a supervisor before resuming gas appliance installations

A technician recently smelled gas during a rushed installation. He located one leak but wasn’t confident it was the only source. He turned on the gas anyway.

This led to a gas buildup, emergency utility intervention, a shutdown of an entire business, and serious reputational damage to our company. The leak was ultimately found in the newly installed appliance.

1. Stop Immediately

   • If a gas odor is detected or leak cannot be ruled out, halt all work.

   • Do not energize or light any appliance until complete testing is performed.
     
     

2. Use Proper Leak Detection

   • Apply bubble solution to all piping, fittings, and appliance connections.

   • Scan system and appliance with a calibrated electronic gas detector.

   • Test factory components, including valves and manifolds.
     
     

3. If Leak Source is Not Confirmed

   • Do not proceed with gas turn-on.

   • Tag the appliance and piping: “DO NOT USE – Leak Suspected”

   • Notify your supervisor and the customer.

   • Return only after complete resolution and clearance.