On Mon, 01 Dec 2003 18:31:46 +0000, "Ed Sirett"
<(E-Mail Removed)> wrote:
>On Mon, 01 Dec 2003 15:35:54 +0000, Alan wrote:
>
>> Hello all,
>>
>> I'd like to distribute the output of my compressor to various outlets around
>> the (large) garage to minimise hoses everywhere when using air tools. I can
>> easily buy 1/4" BSP quick-release air fittings, however, can I adapt these
>> to fit onto 15mm copper pipe, and will "standard" copper pipe be OK for the
>> 100PSI (max) pressure invoved?
>> I'd solder the copper joints and presumibly have a compression fitting to
>> adapt to the 1/4" BSP fitting.
>>
>> The connection to the compressor would be by a short flexible hose to the
>> wall mounted distribution system.
>>
>> Can anyone recommend a source of the adaptors? Is copper pipe up to the job
>> or should I consider something else?
>>
>There may be some regulation against the use of copper for this application.
>All garages/factories I have seen use glavanized steel pipes.
I looked into this a couple of months ago for this application but
have not implemented anything as yet.
I did some web searching and specific information seems to be scarce.
The best resource that I found was the web site and literature from a
company called Thomas Wright Ltd., with branches in Lancashire and
Yorkshire.
www.thorite.co.uk
They sell everything needed and more for compressed air systems,
pneumatic controls etc. etc.
There is a publication called "Pipe Up" orderable from their web site
which describes how to build a workshop airline using either Table X
copper tube and compression fittings or a push fit nylon system.
It gives some typical designs including the arrangements required to
prevent water being carried to the outlets, how to hook up the
compressor and controls such as filters/regulators/oilers.
The plastic system is rated up to 10 bar @ 23 degrees and 7 bar @ 70
degrees, whereas the copper is rated to 10 bar @ 30 degrees. Both are
said to be suitable for use with compressors up to 15HP.
There are comments to the effect that plastic should not be used where
there is a risk of mechanical damage.
For the copper, it does specify that compression fittings should be
used. Not in this leaflet, but I remember reading somewhere else that
soft soldered fittings should not be used for compressed air services,
but I can't find it.
Finally, in the booklet it does mention that some users and owners of
compressed air systems are responsible for complying with the Pressure
Systems and Transportable Gas Container Regulations and that Thomas
Wright company is a "competent person" for these purposes.
Further digging revealed that this regulation has been replaced by the
Pressure Systems Safety Regulations, 2000.
http://www.hmso.gov.uk/si/si2000/20000128.htm
There is very familiar terminology in this SI referring to "competent
persons" etc.; but I could find no such definition.
I read through the SI fairly quickly and it appears that the
requirement is that a "written scheme of examination" must be drawn up
and executed by a competent person.
However, like quite a lot of HSE related legislation, it appears that
this applies to installations in places of work. However it does
include installations used by the self-employed as part of their work.
There is a paragraph in Thomas Wright's booklet to the effect that
they can advise regarding the requirements.
They do also sell steel pipe and fittings, but this is not covered in
the design guide.
>
>It may just be conservatism on the part of the installers but the penalty
>for using steel is so big on the install that I'm inclinded to think that
>there may be a safety reason. The stroed energy in even a small compressor
>tank is large.
>
>There is no problem converting from 15mm to 1/2" and from there using
>bushes and nipplesto 1/4".
..andy
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