Whether you are relocating your dryer or installing a new one, there are a few safety precautions you should be sure to take upon doing so. It is important to be very cautious when disconnecting your dryer from the gas line because of potential fire hazards or gas explosions. If you feel at all hesitant about disconnecting your gas dryer yourself, make sure to contact a qualified technician to perform the task for you. However, taking the following steps during this process will ensure a safe disconnection:
- Put out all flames and pilot lights in your home because residual gas has the ability to escape when disconnecting the dryer from the gas line.
- Remove all lint from the lint screen and around the dryer.
- Switch the dryer’s control knob to off, and unplug the dryer from the electrical outlet.
- Turn off the dryer’s gas supply. You can do this by turning off the small valve on the dryer line or the main valve that supplies gas to the whole house.
- Disconnect the dryer from the gas line by unscrewing the flex hose from the line only.
- Seal the gas line using a gas line cap. Wrap Teflon tape around the connection to ensure a complete seal.
- Allow the room to air out for about five minutes. If the room still smells like gas after this time, make sure all of the gas lines are shut off in your home. Calling a professional may be necessary if the smell still lingers.
Congratulations! You have successfully disconnected your gas dryer. Doing this may not seem like a difficult task, but it is imperative that you take these steps in order to guarantee the safety of both you and your home.
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By: Katie Marinelli
1st Source Servall Blog 
There is some ambiguity in step 5. There is a gas supply line, a flexible gas line and the dryer. there are two large nuts at the gas supply-gas line connection and there are two large nuts at the gas line -dryer connection. You identify “gas line … flexible hose”. I would suggest “gas supply line …… flexible hose”. That leaves the disconnecting question: there are two nuts – which is loosened? – the one closer to the flex line or the one closest to the gas supply line? Do you need two wrenches or one (is one nut held in place while the other is loosened)?
I think we’ve turned off the valve and dryer line safely. Thanks for the information. I don’t know that we have a gas line cap. The room, however is free from gas smell. So we are proceeding with our laundry room floor installation.