UV/IR detectors?
-----Original Message-----
From: Fpdcdesign via Sprinklerforum <sprinklerforum@lists.firesprinkler.org>
To: Sprinklerforum <sprinklerforum@lists.firesprinkler.org>
Cc: Fpdcdesign <fpdcdes...@gmail.com>; Matt Grise <m...@afpsprink.com>
Sent: Tue, Sep 3, 2019 7:47 am
Subject: Re: Ice Build-up on Linear Heat Detection for Double Interlock
Pre-Action Sprinkler System
Could the LHD be moved away from the door?#yiv4117383938
#yiv4117383938edo-signature img {max-width:90%;}
Todd G Williams, PEFire Protection Design/ConsultingStonington, CT860-535-2080
(ofc)860-553-3553 (fax)860-608-4559 (cell)
On Sep 3, 2019 at 7:25 AM, <Matt Grise via Sprinklerforum> wrote:
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Could you use a different type of detector near the doors that would be easier
to de-ice or more tolerant of ice buildup? Maybe a pilot detector head? It
could be changed out more easily as ice builds up.
Matt
From: Sprinklerforum <sprinklerforum-boun...@lists.firesprinkler.org>On Behalf
Of Russell Gregory via Sprinklerforum
Sent: Tuesday, September 03, 2019 4:44 AM
To: sprinklerforum@lists.firesprinkler.org
Cc: Russell Gregory <rcgreg...@snap.net.nz>
Subject: Ice Build-up on Linear Heat Detection for Double Interlock Pre-Action
Sprinkler System
We have a problem with ice forming on LHD cable inside a Coldstore at the
access doors. The LHD is “Protectowire” and is used as the first detection for
a Double Interlock Pre Action system. The Coldstore temperature is -10⁰C.
- Is there any way to reduce or prevent this condensing water vapour from
freezing on to the LHD? Would spraying the cable with silicone spray be helpful?
- Is there a practical method of removing the ice at say 1 – 3 monthly
intervals? Spraying de-icing fluid comes to mind but as it is in a frozen food
warehouse that may have a contamination problem although all products are
cartoned and wrapped.
I have checked FM and Manufacturers Data sheets but have not found reference to
external ice loading.
VESDA recommend the application of silicone spray so wonder if this would help.
Any thoughts would be appreciated.
Regards,
Russell
Russell A Gregory
Special Projects Engineer
Johnson Controls
Wormald Christchurch
New Zealand
Ph xx64 3 338 4853
e-mail; rcgreg...@snap.net.nz
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