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Safety -- Make sure you are safe! |
2007-01-02, 5:47am
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Safety ALWAYS
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Join Date: Jun 10, 2005
Location: Sauk Rapids, Minnesota
Posts: 2,401
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Code (NFPA) dictates that no more than 20 PSI of fuel gas be allowed to "penetrate" a structural wall. This minimizes the amount of fuel gas that could leak and cause an explosion.
It's the same reason a 20 pound bbq tank is not allowed in a residence.
Full tank pressure is around 100 PSI (depending on the temperature). If there was a leak, a 20 pound tank would empty itself in a fairly short time, filling the room with an explosive mixture of gas. If I remember correctly, the explosive percentage of propane is in the 3-4% range (meaning that only 3-4% of the "air" in a room needs to be propane to reach explosive content), and remember that propane is heavier than air and displaces air, so it puddles in the lowest place, where, it will be close to 100%.
At a maximum of 20 PSI through the wall, and honestly, the most you should ever run is about 10 PSI, it will take much longer to reach explosive content.
My run is fairly short, about 15 feet total and I keep my regulator on the tank, and set to 5 PSI.
If you have fluctuation issues, I'd put a 10 PSI regulator on the tank and another regulator on the line right at the final valve before it transitions to the "T" grade rubber hose.
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2007-01-02, 7:04am
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Nah, not really...;)
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Join Date: Aug 30, 2005
Location: NW of Asheville, NC
Posts: 2,817
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I skimmed over this thread quickly, so forgive me if the answer is already here, and I didn't want to start a new thread, eek.
My propane reg has locked up before so, can you recommend a 'brand' regulator for outside even if the temp gets to freezing? Maybe a link?
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2007-01-02, 8:21am
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Safety ALWAYS
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Join Date: Jun 10, 2005
Location: Sauk Rapids, Minnesota
Posts: 2,401
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There are many brand regulators. Talk to your local welding shop. You need an acetylene/propane regulator with a max pressure of no more than 15 PSI.
Don't let them sell you a fuel gas regulator with more than 15 PSI of usable pressure. Typically, we use a max of about 5 PSI, and 5 PSI on a 15 PSI regulator is in the 1/3 range, and you should get good adjustability from that. I've seen regs sold by some supply companies that have a range of 0-60 PSI, and you just can't set an accurate pressure on those.
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2007-01-02, 10:11am
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Gentleman of Leisure
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Join Date: Jun 10, 2005
Location: A Little Bit West of Yosemite Valley
Posts: 5,200
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Quote:
Originally Posted by MikeAurelius
Code (NFPA) dictates that no more than 20 PSI of fuel gas be allowed to "penetrate" a structural wall. This minimizes the amount of fuel gas that could leak and cause an explosion.
It's the same reason a 20 pound bbq tank is not allowed in a residence.
Full tank pressure is around 100 PSI (depending on the temperature). If there was a leak, a 20 pound tank would empty itself in a fairly short time, filling the room with an explosive mixture of gas. If I remember correctly, the explosive percentage of propane is in the 3-4% range (meaning that only 3-4% of the "air" in a room needs to be propane to reach explosive content), and remember that propane is heavier than air and displaces air, so it puddles in the lowest place, where, it will be close to 100%.
At a maximum of 20 PSI through the wall, and honestly, the most you should ever run is about 10 PSI, it will take much longer to reach explosive content.
My run is fairly short, about 15 feet total and I keep my regulator on the tank, and set to 5 PSI.
If you have fluctuation issues, I'd put a 10 PSI regulator on the tank and another regulator on the line right at the final valve before it transitions to the "T" grade rubber hose.
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Yah!..
Dale
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San Francisco - A Few Toys Short of a Happy Meal
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2007-01-02, 10:19am
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Gentleman of Leisure
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Join Date: Jun 10, 2005
Location: A Little Bit West of Yosemite Valley
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About Regulators.... You may not even need an adjustable regulator... An low cost appliance regulator (similar to BBQ regulator also called "pancake" regulator) with a set pressure of 2psi may be all you need.... Check with propane supplier (not just tank fill place-gas station) to see if a "set pressure" regulator may be available....
This is what I used with borrowed National torch, it is set at 1/4 psi (7 IW) and works great. I got it at RV supply place.
Dale
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San Francisco - A Few Toys Short of a Happy Meal
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2007-01-02, 1:46pm
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Nah, not really...;)
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Join Date: Aug 30, 2005
Location: NW of Asheville, NC
Posts: 2,817
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Thank you!!!
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2007-01-02, 6:07pm
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Formerly SirWatson
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Join Date: Aug 29, 2005
Location: St. Louis, MO
Posts: 1,985
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Ah! Makes sense! Thank you Mike!
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Karla Repperger
Studio Solana
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