Like Neil, I don't let the cleaners in and the lab is indeed filthy. The cleaners seem quite happy about this as it's a large room they don't have to clean and they view the magnet as some extension of Beelzebub especially when I'm doing a nitrogen fill. I think I have our in-house maintenance people sufficiently aware of the implications (my wrath - lots of ££ wasted), but outside contractors eg smoke alarms, fire extinguishers tend to come and go as if they owned the place.
When the system was installed I had lines painted on the floor at the 5 and 50G distances. Someone managed to ignore the warning notices and step on the 5G line while the paint was still wet, so I put a plastic chain around at 5G which seems reasonably effective at getting the message across.
I suspect that, in the event of a quench, the instinct of the uninitiated as well as the more informed response of those in the know, would be to get out fast.
Our local Fire Brigade were more concernd that we didn't have a "Panic Button" which would de-energise the magnet, so that they could safely approach wearing oxygen cylinders.
Sheila Glidewell
Dr S M Glidewell
Scottish Crop Research Institute
Invergowrie
DD2 5DA
UK
Tel: +(0)1382 562731
Fax: +(0)1382 568516
Web: http://wwwexternal.scri.sari.ac.uk/SCRI/Web/Site/home/SpecialTopics/NMR/NMRHome.asp
-----Original Message-----
> From: Neil Jacobsen [mailto:neil_at_u.arizona.edu]
> Sent: Thursday, May 27, 2004 9:03 PM
> To: ammrl_at_ammrl.org
> Subject: Re: Warning notice
I think it would be worth saying something about cleaning people. We don't
allow any cleaning people in any of our NMR rooms. Of course that means we
have to empty the garbage ourselves, and the rooms are filthy, but I think
it's worth it. I think this policy started when I was trying to explain
the magnet situation to a new custodial staffer who was deaf, and after
awhile it dawned on me that maybe we didn't really need to have the rooms
cleaned. Of course, this policy has to be explained to the supervisors
since staff changes regularly and all of these people have master
keys. We've also had problems with maintenance people coming into the
rooms to turn valves, shut off power, etc., and you just have to be
vigilant. I try to get to know the maintenance people and have them always
go into these rooms with a "chaperone".
Neil
At 05:13 AM 5/27/2004, you wrote:
>Hi,
>I had someone get a metal chair stuck to the base of a 500 mhz magnet
>last
>year. It took 3 people and a few 2x4's to break it away slowly. No quench.
>Lucky. Field came back and is stable.
>We did have some notices posted on the doors and the magnet. However the
>cleaning person couldnt speak English nor able to read much of it let
>alone technical terms.
>Since then I have warnings posted in several languages. ie; JAK MAGNET!,etc/
>
>JIm
>
>Alan Boyd wrote:
>
>>Dear AMMRLers,
>>
>>We had a safety inspection this morning, and it was pointed out that
>>in our rather small open-access lab there was no warning notice about
>>magnet quenches. I said that this was a low probability occurrence,
>>and it usually happened when someone knowledgeable was fiddling about
>>with the magnet anyway.
>>
>>We were just about to agree to put up a plain text warning to say 'get
>>out fast if there's a quench', when someone remarked that it was quite
>>possible for an enthusiastic cleaner's floor-polishing machine to get
>>sucked into the magnet, and then the probability of a quench was quite
>>high... as is, unfortunately, the probability of the cleaner being
>>unable to read.
>>
>>So, has anyone devised or designed a graphical or cartoon warning sign
>>that tries to say 'get out fast if there's a quench'?
>>
>>Just trying to avoid re-inventing the wheel...
>>
>>Alan
>>
Neil E. Jacobsen, Ph.D.
NMR Facility Manager
Department of Chemistry
119 Old Chemistry
1306 E. University
University of Arizona
Tucson, AZ 85721
520-621-8146
FAX 520-621-8407 setup from
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Received on Fri May 28 2004 - 11:04:41 MST