Date: Wed, 8 Apr 2009 15:47:32 -0400
Reply-To: "Lazarski, Peter M." <Peter.Lazarski**At_Symbol_Here**US.NGRID.COM>
Sender: DCHAS-L Discussion List <DCHAS-L**At_Symbol_Here**LIST.UVM.EDU>
From: "Lazarski, Peter M." <Peter.Lazarski**At_Symbol_Here**US.NGRID.COM>
Subject: Re: Mercaptan in Gas Suppy
In-Reply-To: A

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The chemicals used to odorize pipeline gas are usually technical grade mixtures of thiols (mercaptans). These are usually added to the gas st ream at an odorizing station at a rate of approximately 1 pound or less per 106 (million) cubic feet. These compounds will react to some degree with the piping, depending upon what it is made of. I kno w copper piping has been used for this purpose in domestic construction and, if this is relatively new, may explain the loss of smell at the b urner. Running the burner while cooking (or whatever) should ‘ref resh’ the smell.

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Another possibility is that for an unknown reason, the concentration at the me ter is lower than it has been in the past.

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From: DCHAS-L Discussion List [mailto:DCHAS-L**At_Symbol_Here**] On Behalf Of Jim Kaufman
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Wednesday, April 08, 200 9 2:27 PM
To: D CHAS-L**At_Symbol_Here**LIST.UVM.EDU
Subject: [DCHAS-L] Mercaptan in Gas Suppy

Has anyone encountered the situation where the odorant smell from the burner gas supply changed when the gas was no t used for several months?  If so, any explanation why?


The individual who posed this question t o me said that his "lost its rotten smell and now s mells slightly musty and is much less noticeable".


Thanks ... Jim


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James A. Kaufman, Ph.D.

The Laboratory Safety Institute (LSI)

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