Sediment Trap Gas Furnace

Most water heaters do not have a sediment trap in them.

Sediment trap gas furnace.

Sediment traps are intentionally installed to help prevent sediment in the gas piping from getting into the gas valve or burner area of an appliance and fouling things up. Sediment traps sometimes mistakenly referred to as drip legs are designed to catch sediment in natural gas before it enters into the water heater or furnace gas valve. A sediment trap is just a t fitting in the gas pipe with a capped pipe nipple at the bottom of the t. The sediment trap needs to be installed downstream of the appliance s shutoff valve and as close to the appliance as practical.

The furnace permit is not available on lineif you. The inlet gas line must have a minimum length of three 3 inches 7 6 cm drip leg sediment trap installed as close to the water heater s gas valve as possible. The photo below shows 18. A ground joint union must be installed as close to the water heater as possible in the gas supply line feeding the water heater to permit servicing of the water heater.

It s required at a furnace boiler and water heater but not at a clothes dryer a kitchen range or a fireplace. The sediment trap shall be either a tee fitting with a capped nipple in the bottom opening of the run of the tee or other device approved as an effective sediment trap this means that all gas furnaces water heaters boilers unit heaters and gas packs are required by code to have a sediment trap in the gas line ahead of the equipment. Different areas have different contaminants in the gas and the traps help catch these. 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.