Propane Regulator Connection – Pigtail

propane regulator connection

The connection between the propane tank and regulator is commonly called the pigtail or hogtail. It connects to the service valve of the propane tank and the inlet connection of the regulator. This connection is also relatively small in diameter which initially restricts gas flow from the tank to the regulator. When the replacing the regulator, you must replace the pigtail as well. Therefore, we will discuss the propane regulator connection.

Propane Regulator Connection

Propane Regulators and Flexible Connectors

According to the NFPA, the regulator connection (pigtail) between the tank and regulator is a flexible connector. Flexible connectors must be 36 inches or less. This means the regulator installation will be no more than 36 inches away from the service valve. The main reason for this 36 inch maximum length is protection against tank pressure being delivered to the downstream piping in the event of a leak. If a leak occurs in the system, the regulator acts as a protective device and will not allow the full LP Gas vapor pressure of the tank to reach downstream.

In addition, pigtails function as protective measures against movement in the gas line.  They are “flexible” and will absorb the shock of sudden movement or jarring of the gas service line if it’s accidentally bumped or moved out of place. If there was not a flexible regulator connection, the piping would be rigid and more susceptible to leaks forming in the event of the piping, tank, or services line moves, either gradually or suddenly.

Propane Regulator Connection Lengths

Propane regulator connections are available in varying lengths and bends. Many of the pigtail installations are straight to begin with. However, your installing gas technician bends the connector to ensure that the regulator easily fits underneath the tank dome.

Additionally, pigtails that are bent during fabrication are common where space (lack of) is an issue, such as an underground tank installation. Pigtails can catch or trap debris from the propane tank over time. Therefore, they require replacement any time there’s a replacement of the regulator.

These are just the basics of propane regulator connections. Contact us with the link below for more information or to schedule your next propane delivery with us!

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