[dd251] Re: Flexible Pipe
- From: "Gill, Chris" <GillC@xxxxxxxxx>
- To: "'dd251@xxxxxxxxxxxxx'" <dd251@xxxxxxxxxxxxx>
- Date: Tue, 28 Jan 2003 11:38:44 -0000
Jeannette
You are correct in saying that pipework in these risks is a critical issue
but we are concerned that there are some in the industry out for a quick
fix. Our experience with new piping products for sprinkler systems has
shown that great care has to be taken to ensure that not only the products
are suitable but that the installation is carried out correctly. I'll
address these issues separately:
Product - given the issues surrounding whether to protect the entire
residential/domestic property or not, the matter of running sprinkler
pipework through unprotected areas needs consideration, approved CPVC
pipework for instance has limitations placed upon its use where it is
exposed (see TB32) and similar limitations would have to be placed on its
use in residential/domestic properties.
The flexible drop pipes that we have approved are also subject to
limitations, this time related to pressure loss. Given that many flexible
pipes are of a corrugated type and that with DD251 systems we are at the
already running with very low pressures this issue becomes very important.
How is the different hydraulic nature of flexile pipe to be taken account of
in design?
Other issues such as mechanical damage, supports and operating temperatures
also need to be considered.
I believe someone mentioned the use of lay flay hose for sprinkler systems;
this simply isn't an option here, lay flat hose is designed to run at much
greater flow and pressure which can deal with most kinks etc which may
occur. This wouldn't be the case in a residential/domestic property. Rigid
hose may be a possibility as this may in fact perform better hydraulically
than a rigid system, but the proper assessments need to be carried out.
Installation: We would all accept that the installation of sprinkler
systems requires a greater deal of care and understanding than a plumbing
system. Given that even in the relatively well supervised world of standard
sprinkler installations we hear of terrible incidents of lack of care (CPVC
systems only being dry fitted for instance) we cannot stress how important
it is that the proper training be given to designers and installers of these
systems, particularly if flexible pipework becomes prevalent.
We are totally in support of the development of residential/domestic
sprinkler protection but we must be careful not to compromise on performance
in order to fit the existing products into a new risk.
Regards,
Chris Gill
Technical Manager
For and on behalf of, LPCB
-----Original Message-----
From: Jeannette Baxter [mailto:j.baxter@xxxxxxxxxxxxxxxxxxxxx]
Sent: 28 January 2003 10:48
To: dd251@xxxxxxxxxxxxx
Subject: [dd251] Flexible Pipe
I'm not sure whether or not my mails have been posted to this site as it has
all gone very quiet on this issue.
Will somebody out there please, please, come up with the solution to this
real problem which will stop the progress of domestic and residential
sprinklers in new build.
Are there none of you out there who can answer the questions I raised
yesterday?
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