Flare fittings are used to provide gas stoves with a tight seal around pipe connections to prevent gas leaks and fire hazards. Gas supply lines come with flare fittings that are easy to install. If the installation is made on a new stove, the installation is pretty easy. However, more time is required when replacing a damaged gas supply line with a new one.
Step 1 – Disconnect the Gas Supply
Before removing any of the fittings from the stove, be sure to disconnect the gas supply line. Turn on the stove for a few seconds to burn excess gas left on the system. Move the stove away from the wall.
Step 2 – Remove the Damaged Gas Supply Pipe
Locate the gas valve where one end of the pipe is connected. Notice that a flare fitting connects the pipe to the gas valve. Use an adjustable wrench to loosen the connection. The direction should always be counterclockwise when loosening and clockwise when tightening. Disconnect the pipe.
To access the connection between the stove and the flare fitting on the supply line, remove the cover plates and burner covers on top of the stove. Remove any screws if any. Locate where the gas supply line is connected. Loosen the flare fitting with an adjustable wrench.
Step 3 – Preparations before Installing the Flare Fittings
Clean the male threads on both the gas valve and the stove with a lint free cloth. When installing a new supply pipe on an old stove, buy a new flexible gas supply line or flexible flare pipe. Check the fittings and the entire pipe for any sign of damage. Check the male threads on the stove and gas valve as well. If there are any scratches which may cause gas to leak, replace the valve.
Don't try to patch the leak with teflon tape to ensure a tight seal. Teflon tape is not used on the flared end of flare fittings. When you purchase a flexible appliance line, it comes with new fittings. If an old one leaks, you should change it. The replacement fitting will require gas approved Teflon tape on the valve side.
Step 4 – Connect the Fittings
Start by connecting the flare pipe to the gas stove. Align the threads and hand-tighten the connection clockwise. Do not tighten the connection completely yet. This allows the other end of the tubing to be maneuvered easily. Next, connect the other fitting to the gas valve. Tighten the connection clockwise as well.
When both fittings are in position, tighten both fittings clockwise with an adjustable wrench. Do not over tighten the connection to avoid breaking the fittings. Be careful when handling the tubing. Check to make sure it does not get twisted or bent.
Step 5 – Test for Leaks
Put back the cover plates and burner covers. Push the stove back to its position flush with the wall. Turn on the stove to check for leaks. If there are leaks even after installing new flare tubing, remove the cover plates and burner covers and detach the gas supply tubing. Check the male threads. If there are minor scratches or damages, wrap them with Teflon tape before installing the fittings. Re-place the covers and retest the connection for any signs of leaks.