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margojean

Jun 12, 2011, 2:36 PM

Post #1 of 17 (4431 views)

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propane leak

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We have a propane leak somewhere under our floors. It is bad enough that all gas appliances are off, the propane tank valve is off, and we can still smell it seeping up. Any suggestions of who to call to find the source of the leak under the tile floor?
margojean



johanson


Jun 12, 2011, 6:03 PM

Post #2 of 17 (4402 views)

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Re: [margojean] propane leak

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Boy; that's scary. It could mean that you are going to most likely have to dig up portions of the floor to find the pipe, and once at that point, cutting the gas line off (you know cutting the pipe and blocking it at that point), turning the gas back on and then checking (smelling) which side the leak is on.

I wish you the best of luck and wish I could give you a simpler solution to your serious problem.

Good luck

Pete


margojean

Jun 12, 2011, 6:37 PM

Post #3 of 17 (4390 views)

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Re: [johanson] propane leak

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Yes. and not the first time. Gas pipes under an old marble floor can be a nightmare.
margojean


robt65

Jun 12, 2011, 8:43 PM

Post #4 of 17 (4366 views)

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Re: [margojean] propane leak

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Hi there,

As Pete says that's a scary proposition for sure. Usually a leak of that kind has been going on a while and underground or concrete cavities can hold a little gas that can be explosive. It goes without saying, be very, very careful. One safe way that you yourself can find the leak, is to drain your tank. Have your normal gas supplier do this as they are usually capable of transferring gas in both directions from and to their trucks and have the gas supplier give you credit for your gas. Get some red leak dye (plumbers dye) at some store such as a Home Depot or Lowes, etc. Introduce that dye to your tank (about a half a cup should do). Add compressed air to your tank to the max pressure the tank allows (depending upon the size of your tank) IT SHOULD BE LABLED “MAX PRESSURE”. Use a bypass at your regulator, so as not to damage the gas regulator with red dye and water. Turn on the pressure and look for any leaks to start showing a red substance. That will only give you an approximate starting point. Who ever does your digging, is going to have to be very careful not to cause any sparks, from any chisels hitting small pieces of concrete. One way to avoid this, is to wrap your chisel blade tip in a 3M Teflon scrubbing pad (the green kind) double or triple the thickness every few hits. Remember some small gas pockets can get trapped during the process, as gas is different from the air you will be using to blow the dye. Follow that red dye trail until you reach your problem area. Once you think you have found your problem area, then make a 25% dish detergent soap and 75% water mixture (a small amount should do the trick), and liberally coat the direct area around your gas pipe you think maybe the problem. You should start to see a bubbling effect.

I would give strong consideration to laying all new gas supply lines outside your home and through the wall to your outlets.
I wish you well.

Robt65



johanson


Jun 12, 2011, 8:52 PM

Post #5 of 17 (4359 views)

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Re: [margojean] propane leak

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I would strongly advise you follow Robt65's suggestion rather than mine. I'm no expert. His seems to make a lot more sense than mine.


YucaLandia


Jun 13, 2011, 6:16 AM

Post #6 of 17 (4334 views)

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Re: [margojean] propane leak

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Your subsequent comments make it sound like this is not the first leak you have had. If the line has leaked previously under the marble floor, and it is leaking now, then it would seem that the existing line will likely continue to develop new leaks in the future, (unless it is a single union that has failed). This points to installation of a new line as the best long-term solution.

A recent explosion at a Cancun restaurant due to gas build-up under the floor also points to the advisability of installing a new line.
steve
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Read-on MacDuff
E-visit at http://yucalandia.wordpress.com/


simpsca

Jun 13, 2011, 8:50 AM

Post #7 of 17 (4294 views)

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Re: [margojean] propane leak

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Another way to do it is run another gas line up over the roof, cut off the old gas line under the floor and come down through the roof and into the walls with a new line. I lived in a rental house for a year, the floor cracked (fault line) and the water pipe under the floor opened up and sprayed water. The land lord repaired that. But the gas pipe was under the same area of floor. We asked the land lord to run a new line from the stove up over the roof to the gas tank and he refused. We moved immediately.


margojean

Jun 13, 2011, 1:00 PM

Post #8 of 17 (4259 views)

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Re: [simpsca] propane leak

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Yes, new outside lines are definitely a possibility.
margojean


robt65

Jun 14, 2011, 8:51 AM

Post #9 of 17 (4211 views)

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Re: [margojean] propane leak

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Hello Margojean,

There is no question, I would opt for outside lines as an end result. This still doesn't fix your present problem. There is undoubtedly gas trapped in one or more spaces under the floor or in a wall. This IS A MAJOR SAFETY PROBLEM that needs to be rectified as soon as possible. Gas can stay trapped for a long time and have a profound effect at some later date. It is not something to ait around on.

Good Luck,

robt65



margojean

Jun 14, 2011, 9:24 AM

Post #10 of 17 (4207 views)

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Re: [robt65] propane leak

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Good advice. It is still venting noticeably into the kitchen. We are waiting for Fugatech to help us with eliminating or at least pinpointing the source. Meanwhile, am I living on a bomb?
margojean


robt65

Jun 14, 2011, 9:56 AM

Post #11 of 17 (4201 views)

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Re: [margojean] propane leak

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Hello Margojean,

I do not wish to alarm you unnecessarily but the direct answer to your last question is yes, most probably yes. Concrete itself is porous, but it can have many non porous areas where gas can be indeed trapped for some period of time. Similar to little small caves if you will, if you put a bunch of this small little "caves" together it can have a significant result. Especially considering how irregular concrete mixture for slabs is usually mixed here in México. I would certainly not be using any open flames, or allow persons to smoke in your home until it gets straightened out. The only sure way to insure that all those "little caves" or gas traps are out from under the house is to dig out the entire line and replace any all gas lines to come directly into the house from outside the house. Many times during extremely dry weather, the earthen subsurface beneath the concrete to slab expand or shrink (depending upon many different factors and cause a floor or wall made of concrete to have cracks. The movement of the concrete (during this expansion or shrinking of the subsurface) with the line set into the concrete or directly below results in the lie itself moving as well causing line or joint in the line to separate a little, causing gas to escape.

robt65



margojean

Jun 14, 2011, 10:12 AM

Post #12 of 17 (4197 views)

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Re: [robt65] propane leak

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Yuk.
margojean


robt65

Jun 21, 2011, 7:58 AM

Post #13 of 17 (4060 views)

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Re: [margojean] propane leak

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Hi margojean,

I was interested in what the outcome on your gas line situation might have been. Did your specialists ever come and find the leak for you?

Robt65


(This post was edited by robt65 on Jun 21, 2011, 7:58 AM)


margojean

Jun 21, 2011, 8:24 AM

Post #14 of 17 (4046 views)

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Re: [robt65] propane leak

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No - we are going for plan B. As I write, pipes are being installed outside and brought inside to the gas appliances by the shortest possible routes through the roof and walls.
I appreciate your advice.
margojean


robt65

Jun 22, 2011, 6:28 AM

Post #15 of 17 (4009 views)

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Re: [margojean] propane leak

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hi margojean

I believe that you have made a wise decision. I would also make sure those other lines that will not be used anymore remain open to the outside air for about six months or so before trying to "cap" or close them off, as it will give a sufficient amount of time to "air out" the old lines and any pockets of gas that may or may not have accumulated.

robt65


margojean

Jun 22, 2011, 7:10 AM

Post #16 of 17 (3996 views)

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Re: [robt65] propane leak

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Ok - will do.
margojean


sparks


Jun 22, 2011, 7:46 AM

Post #17 of 17 (3987 views)

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Re: [robt65] propane leak

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If you just mean 'outside' .... watch for copper thieves

Sparks Mexico - Sparks Costalegre
 
 
 
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