Late "pop" of flame when fireplace is turned off

[Firegood22]

I recently replaced the burner on my three sided LP gas fireplace. The install went fine and it starts and burns nicely; however, when I turn it off after several seconds there is a "pop" of flame in the back left corner near the air shutter (see video, wait for it, it takes a several seconds to appear). Is this anything to be concerned about? Ideas why it might be happening? I don't recall this happening with the burner I replaced. Thanks in advance.

 

[Whitenuckler]

I recently replaced the burner on my three sided LP gas fireplace. The install went fine and it starts and burns nicely; however, when I turn it off after several seconds there is a "pop" of flame in the back left corner near the air shutter (see video, wait for it, it takes a several seconds to appear). Is this anything to be concerned about? Ideas why it might be happening? I don't recall this happening with the burner I replaced. Thanks in advance.
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M

Thread 'Loud bang when stove turns off'

Nov 4, 2009

We have an Avalon Cedar LP gas stove -7yrs. This whole time eveytime it goes off there is a very loud bang. We were told a while back that it was normal and there was nothing they could do. I have tried adjusting flame and air and nothing works. We kind of gave up for a while. I am just wondering if anyone else has had this experience...it gets quite irritating-esp to guests who are not used to it!

• mmaile
• Replies: 7
• Forum: It's a Gas!

Here is a post. It looks like unburned gases going off one last time.

 

[Firegood22]

M

Thread 'Loud bang when stove turns off'

Nov 4, 2009

We have an Avalon Cedar LP gas stove -7yrs. This whole time eveytime it goes off there is a very loud bang. We were told a while back that it was normal and there was nothing they could do. I have tried adjusting flame and air and nothing works. We kind of gave up for a while. I am just wondering if anyone else has had this experience...it gets quite irritating-esp to guests who are not used to it!

• mmaile
• Replies: 7
• Forum: It's a Gas!

Here is a post. It looks like unburned gases going off one last time.

That does sound like a similar situation. I’ll keep looking into it but sounds like something to not be too concerned about. Thank you.

 

[gthomas785]

This is common with LP burners. LP is dense so a bit of residual (rich) fuel sits in the bottom of the burner, and after the flow stops it will gradually mix with enough air to diffuse out and hit the pilot and then pop.
Is the unit sitting perfectly level? Sometimes if the burner is sloped away from the pilot it can make the issue more noticeable. But still it's not really anything to be concerned about.

 

[FanMan]

Our Osburn has always done that.

 

[Tech Guru]

Relatively common on LP burners, I've always referred to them as "Extinguishing pops". LP is heavier than air, so when the valve closes the gas still in the system can pool up a bit and ignite when it hits the pilot flame or other ignition source. It may also be lessened once the burner media - Logs, coals, rockwool - is installed.