From: ILPI Support <info**At_Symbol_Here**>
Subject: Re: [DCHAS-L] Heating tape for DMSO column
Date: Wed, 30 Sep 2015 18:03:55 -0400
Reply-To: DCHAS-L <DCHAS-L**At_Symbol_Here**MED.CORNELL.EDU>
Message-ID: 635BD1D1-3176-41C1-9359-23AD9243393A**At_Symbol_Here**

I don't see any issues.  We used to use heating tapes for a couple operations on high vacuum lines.  For example. one was a big supported metal oxide and molecular sieve column used for removing oxygen and water from gases - you would regenerate it by passing a forming gas mixture (about 5% H2 in N2) through it.  The whole thing was wrapped with a heating tape.   I see no more hazard than, say, a heating mantle (and this seems a lesser risk than that).

Forget the heat gun idea - that's more likely to cause an issue because of uneven heating/thawing, as well as user impatience causing them to cut corners etc.

If a runaway heating cord is your concern, there are secondary devices that you can plug your heating system into.   If the temperature rises about a preset limit. it will cut power to the main controller.   Probably overkill for the risk you're looking at here, but here's an example from our own lineup:

Rob Toreki
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On Sep 30, 2015, at 4:00 PM, "Debbie M. Decker" <dmdecker**At_Symbol_Here**UCDAVIS.EDU> wrote:

My newest researcher will be using a column purification system to purify his suite of solvents for organic synthesis.  One of those is DMSO.  It freezes at about room temperature.  He wishes to use a heating tape to keep it gooey enough to go through the column.  Here's what he's proposing to use:
I'm inclined to say go ahead, so long as he installs this column at the end of the rack and in proximity to the least flammable of the other solvents..  I'm also wondering if he should just have it on at low temperature all the time or wait until they have a problem and then thaw it using a heat gun.  I don't like the heat gun idea, particularly, but there are also risks associated with having something heating all the time.
What do ya'll think?
Debbie M. Decker, CCHO, ACS Fellow
Chair, Division of Chemical Health and Safety
University of California, Davis
Birkett's hypothesis: "Any chemical reaction
that proceeds smoothly under normal conditions,
can proceed violently in the presence of an idiot."

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