Orifice question

notjustair

Well-known Member
I have an OLD apartment size gas stove that I used to use to can before I moved to the farm. It is perfect for it as the pot sits closer to the flame than the new fangled ones.

I only have LP here. I'm not sure whether orifices are standard or whether I would be able to get one. Is LP larger? Friend said she thought it was and she had drilled out an orifice when it was obsolete.

I haven't turned it to see if it has information on the back. I wouldn't be surprised if it was an old General Motors or something. I was just hoping I could drill it and someone knew the size bit.

Funny story. When I was a kid grandma wanted a new stove. We went to Great Bend and bought one. The kid that installed it had the wrong orifices in it. Grandma put in a roast and came back an hour later to a house full of smoke. She grabbed the Dutch oven and dropped it out the back door where it promptly burned an oval hole right throught the door mat. I knew dinner was in jeopardy when I got to the door and saw that hole burned in the rug.
 
Everybody above is right. But some old stoves had
adjustable orifices. Our old Venice Skelgas does.
Just takes a crescent wrench.
 
OK here we go. LP is 16 to one as where nat gas is about 6 or 8 to one. That is gas to air mix ratio. BIG differance. When ovens and the top burners are shipped from factory the BURNERS are adjusted for LP. They are wide open. Nat. gas should be open about 1/4 of the way. This gives you the correct fuel air mix. The regulator on the suply line is what first must be changed. Then think about changing the orifices if they were replaced or drilled. One, the regulator you should see a little lable 4.5 - 6 inch per water columb. LP is in the 8 to 10 in water colum. You need to look at that first. The regulator is not that expensive. The little orifices must be measured with number finger drills. These little sets cost $135.00 per set! I have three sets from two different jobs. There is a conversion chart that tells you how to convert the Btu. rating on your ranges builder plate to NAT. or LP and what drill size you should need. Do the burners on top AND the oven orifice TOO. Get you LP supply guy in there and ask a couple of questions as he checks things out. Jeffcat
 

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