Launching a pipeline pig:

  1. Verify that the kicker valve and isolation valves are closed.
  2. On a natural gas system, open the vent to allow it to reach atmospheric pressure. In a liquid system, open the drain valve and allow the liquid to be displaced by opening the vent valve. 
  3. Leaving the valves open, allow it to drain completely (0 psi), and then open the closure door. 
  4. Now, install the pipeline pig, allowing firm contact between the reducer, which is situated between the nominal bore section of the launcher and the barrel. 
  5. Clean all sealing surfaces and the closure seal. Apply lubricant if necessary, and secure the door. 
  6. Close the drain valve and slowly fill the trap by gradually opening the kicker valve, allowing venting through the vent valve.
  7. Once it is filled, close the vent valve and allow pressure to equalize across the isolation valve. 
  8. Once you open the isolation valve, your pig is ready to be launched.
  9. Partially close the main line valve to increase flow behind the pig and through the kicker valve. Continue closing the main line valve until the pig signal indicator shows that the pig has left the trap and made its way into the main line. 
  10. Once the pig has left the trap and entered into the main line, it is time to open the main line valve, and to close the kicker valve and isolation valve. 

 

Receiving a pipeline pig:

Verify whether there is any pressure inside the receiving trap before starting receiving procedures.

  1. Ensure that the receiver is pressurized. 
  2. Fully open the bypass valve.
  3. Fully open the isolation valve while partially closing the main valve.
  4.  Monitor the pig signaller to determine it’s arrival.
  5. Close the bypass and isolation valves.
  6. Open the vent valve and the drain valve.
  7. Check whether the trap is being depressured.
  8. Open the trap closure and remove the pipeline pig. 
  9. Clean and seal the pig closer and closure box, and remove it from your receiver 
  10. Clean the sealing surfaces as well as any other sealing surfaces. Lubricate as needed and secure the closure door.
  11. Return the pig receiver to its original condition. 

* Ensure all launchers are primed.
* Ensure all launchers are hydrostatically tested.
* Ensure valves on launchers and receivers are round.
* Ensure the full port has a 100% pipe size opening.

 

Operating Sequence for Launching and Receiving Pigs