[dd251] Re: Reply to Brian
- From: Dave Turnbull <dturnbul@xxxxxxxxxxx>
- To: "'dd251@xxxxxxxxxxxxx'" <dd251@xxxxxxxxxxxxx>
- Date: Fri, 24 Jan 2003 14:04:10 -0000
Members,
there appears to be two types of water mist pressure systems
available on the market at the present;
1) the high pressure type mentioned below
2) a low pressure mist system that operates at between 1.5 bar to 8 bar
pressure provided by companies such as "Aquamist Fire Technology" does
either comply to current standards
David
-----Original Message-----
From: William [mailto:william@xxxxxxxxxxxxxxxxxxx]
Sent: 22 January 2003 17:41
To: dd251@xxxxxxxxxxxxx
Subject: [dd251] Reply to Brian
Members
Thank you to Brian for his comments on my questions put forward.
I am still looking for answers but will address some of Brian,s comments
1) A water mist system works at higher pressure than a normal sprinkler
system. Again what pressure is it 200 bar?
2) My point is that there are certain requirements to pipework and fittings
to be listed within the standards. For example CPVC has a pressure rating
and would not comply with certain sytems.Are you saying that any pipe can be
used to link sprinklers? The standards are clear on this issue
3) Residential sprinkler heads are listed and within a standard example NFPA
13D, The NFPA 13D standard can be applied throughout the world even in
Barbados. As this is a international standard this can also be used with
possible relaxation to local building codes. I must ask the question again
is there any mist sprinkler head listed for RESIDENTIAL use.
4) It is a fact that mist systems can be prone to blockages as the aperture
is very small. In lab conditions the system is perfect but when filled with
standing water for years this then becomes quite the reverse.
5) Leaking diaphram seals are on the pressure cylinders and not on sprinkler
heads.Are fire extinguishers checked?
6) Normal sprinkler systems are a different fluid catogory on a water issue
than a mist or sprinkler system with additives. A single check valve is
required for cat 2 systems. Any other type of system has to gain water
approval (United Utilites North west water) if connected to towns main
7) Irrespective of what happens in the USA its what happens here. There are
systems that are linked to plumbing and used in USA and conform to NFPA 13D
but are cat 1 in water regs and at the moment they no water approval. so the
answer is in above at 6
The research you have done is good but you have to know systems and
standards to make things work throughout the world.
Sprinklers do have a major role in life safety and construction. but they
must comply with standards and when I am satisfied that a water mist system
complies to a standard that is for residential use then we can install
them.This is why I am looking for answers
Companies who install systems or products not complying to standards for
which they are deemed for leave themselves and clients open for litigation
and prosecution for negligence.
William
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