Furnace Gas Line Drip Leg

Sediment traps are usually installed very close to the water heater or furnace valve.

Furnace gas line drip leg.

Drip legs or sediment traps the technical term are supposed to be installed as close as possible to the inlet of every appliance as required. The drip leg sediment trap called by either name is a gas line safety device required by the national fuel gas code ansi z223 1 nfpa 54 and by the irc international residential code the upc uniform plumbing code and the nfpa national fire protection agency along with most if not all manufacturers of large gas appliances including water heaters and furnaces boilers and gas pool heaters and is listed in the installation procedures of the appliance manual installation instructions. Sediment traps are intentionally. The outlet of the meter is one such location.

It s called a sediment trap. The outlet of the meter is one such location. Drip legs are basically for catching condensate and moisture in a gas line. This pipe extension usually is at least 3 inches long and is intended to catch any water or foreign material that may be in the gas before the material gets into the appliance itself.

Hi fellow inspectors i was inspecting an hvac forced air furnace the other day and i saw this drip leg which does not cause the gas line to change a 90 degree direction which i mark this as defective. Sediment trap dirt pocket or drip leg at the appliance connection point there usually is a sediment trap or dirt pocket sometimes called a drip leg that includes a nipple and a cap. A sediment trap usually is installed as close to the appliance as possible. A drip leg can be installed anywhere at the low point in the piping system if there is moisture in the gas to allow for the removal of the condensation.

A drip leg can be installed anywhere at the low point in the piping system if there is moisture in the gas to allow for the removal of the condensation. The general rule of thumb is any appliance that will fire while unattended water heater furnace pool heater etc needs to have one installed.