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:


#yiv4117383938 #yiv4117383938 -- _filtered #yiv4117383938 {panose-1:2 4 5 3 5 4 
6 3 2 4;} _filtered #yiv4117383938 {font-family:Calibri;panose-1:2 15 5 2 2 2 4 
3 2 4;} _filtered #yiv4117383938 {panose-1:2 15 3 2 2 2 4 3 2 4;} 
#yiv4117383938 #yiv4117383938 p.yiv4117383938MsoNormal, #yiv4117383938 
li.yiv4117383938MsoNormal, #yiv4117383938 div.yiv4117383938MsoNormal 
{margin:0in;margin-bottom:.0001pt;font-size:11.0pt;font-family:sans-serif;} 
#yiv4117383938 a:link, #yiv4117383938 span.yiv4117383938MsoHyperlink 
{color:blue;text-decoration:underline;} #yiv4117383938 a:visited, 
#yiv4117383938 span.yiv4117383938MsoHyperlinkFollowed 
{color:purple;text-decoration:underline;} #yiv4117383938 
p.yiv4117383938MsoListParagraph, #yiv4117383938 
li.yiv4117383938MsoListParagraph, #yiv4117383938 
div.yiv4117383938MsoListParagraph 
{margin-top:0in;margin-right:0in;margin-bottom:0in;margin-left:.5in;margin-bottom:.0001pt;font-size:11.0pt;font-family:sans-serif;}
 #yiv4117383938 p.yiv4117383938msonormal0, #yiv4117383938 
li.yiv4117383938msonormal0, #yiv4117383938 div.yiv4117383938msonormal0 
{margin-right:0in;margin-left:0in;font-size:11.0pt;font-family:sans-serif;} 
#yiv4117383938 span.yiv4117383938EmailStyle19 
{font-family:sans-serif;color:windowtext;} #yiv4117383938 
span.yiv4117383938EmailStyle21 {font-family:sans-serif;color:windowtext;} 
#yiv4117383938 .yiv4117383938MsoChpDefault {font-size:10.0pt;} _filtered 
#yiv4117383938 {margin:1.0in 1.0in 1.0in 1.0in;} #yiv4117383938 
div.yiv4117383938WordSection1 {} #yiv4117383938 _filtered #yiv4117383938 {} 
_filtered #yiv4117383938 {} _filtered #yiv4117383938 {} _filtered 
#yiv4117383938 {} _filtered #yiv4117383938 {} _filtered #yiv4117383938 {} 
_filtered #yiv4117383938 {} _filtered #yiv4117383938 {} _filtered 
#yiv4117383938 {} _filtered #yiv4117383938 {} #yiv4117383938 ol 
{margin-bottom:0in;} #yiv4117383938 ul {margin-bottom:0in;} #yiv4117383938 
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
 
  
 
  
 _______________________________________________Sprinklerforum mailing 
listSprinklerforum@lists.firesprinkler.orghttp://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org_______________________________________________
Sprinklerforum mailing list
Sprinklerforum@lists.firesprinkler.org
http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
_______________________________________________
Sprinklerforum mailing list
Sprinklerforum@lists.firesprinkler.org
http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org

Reply via email to