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VESDA Maximum Height
#1
Is there a maximum height at which horizontally arranged VESDA tubes can be installed

I have come across a 14m high installation in a very high value 4000m2 vehicle storage garage/warehouse. The VESDA tube inlets are around 12m above the cars and set flat on the underside of the slightly pitched roof

My concerns are 
  • the 12m gap may create an untenable time delay prior to discovery, not withstanding the air sampling nature of this kit
  • smoke stratification may prevent or delay the smoke reaching the VESDA air flow

Is this a problem or am I overthinking this issue?
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#2
(06-11-2019, 06:19 PM)Messy Wrote: Is there a maximum height at which horizontally arranged VESDA tubes can be installed

I have come across a 14m high installation in a very high value 4000m2 vehicle storage garage/warehouse. The VESDA tube inlets are around 12m above the cars and set flat on the underside of the slightly pitched roof

My concerns are 
  • the 12m gap may create an untenable time delay prior to discovery, not withstanding the air sampling nature of this kit
  • smoke stratification may prevent or delay the smoke reaching the VESDA air flow

Is this a problem or am I overthinking this issue?


I thought it was about 40m top of my head
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#3
   
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#4
Blimey

That was quick. Thank you so much for the info

Zenengineering - can you tell me where that table comes from please?
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#5
Sure its 22.7 of 5839-1 (Table 3)
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