Compressed air distibution in garage

Discussion in 'UK DIY' started by Alan, Dec 1, 2003.

  1. Alan

    Alan Guest

    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?

    Regards,

    Alan.
     
    Alan, Dec 1, 2003
    #1
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  2. Alan

    S P O N I X Guest

    On Mon, 1 Dec 2003 15:35:54 -0000, "Alan"
    <alz_deane@no_spam.ntlworld.com> 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 garages I have seen use galvanised steel tubing and quick release
    joints.

    I suspect copper tubing will be too fragile.

    sPoNiX
     
    S P O N I X, Dec 1, 2003
    #2
    1. Advertising

  3. Alan

    Grunff Guest

    Alan wrote:

    > 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.


    You'll think I'm crazy, but I've successfuly used 25mm MDPE for
    air distribution. It's cheap, easy to work with, and rated at
    12bar (~180psi).

    --
    Grunff
     
    Grunff, Dec 1, 2003
    #3
  4. Alan

    Ed Sirett Guest

    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.

    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".
    --
    Ed Sirett - Property maintainer and registered gas fitter.
    The FAQ for uk.diy is at www.diyfaq.org.uk
    Gas fitting FAQ http://www.makewrite.demon.co.uk/GasFitting.html
    Sealed CH FAQ http://www.makewrite.demon.co.uk/SealedCH.html
     
    Ed Sirett, Dec 1, 2003
    #4
  5. "Grunff" <> wrote in message
    news:...
    > Alan wrote:
    >
    > > 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.

    >
    > You'll think I'm crazy, but I've successfuly used 25mm MDPE for
    > air distribution. It's cheap, easy to work with, and rated at
    > 12bar (~180psi).
    >
    > --
    > Grunff
    >


    I second Grunff's vote for 25mm mdpe. I run it around two workshops and an
    underground run of 120' to my foundry at the bottom of the garden, and have
    had no problems whatsoever with it over 15 years.

    In the US on various metal working use groups they get very excited that
    pvc shouldn't be used as it fractures and shards fly everywhere, by I think
    their pvc 'water line' is much more brittle than our mdpe.

    Andrew Mawson
     
    Andrew Mawson, Dec 1, 2003
    #5
  6. Alan

    Grunff Guest

    Andrew Mawson wrote:

    > In the US on various metal working use groups they get very excited that
    > pvc shouldn't be used as it fractures and shards fly everywhere, by I think
    > their pvc 'water line' is much more brittle than our mdpe.


    PVC is a very different beast - it's completely dependant on
    it's plasticiser content for flexibility. Lose that plasticiser
    over time and you have very brittle pipes.

    MDPE OTOH is very soft and ductile - I'd much rather experience
    a burst MDPE pipe than just about any other material.

    --
    Grunff
     
    Grunff, Dec 1, 2003
    #6
  7. Alan

    Andy Hall Guest

    On Mon, 01 Dec 2003 18:31:46 +0000, "Ed Sirett"
    <> 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

    To email, substitute .nospam with .gl
     
    Andy Hall, Dec 1, 2003
    #7
  8. Alan

    geoff Guest

    In message <NhJyb.2961$>, Alan
    <alz_deane@no_spam.ntlworld.com> writes
    >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.
    >

    15mm copper pipe isn't spec'd to take the sort of pressures generated by
    a compressor.

    You're better off using flexible compressor hosing and suitable
    fittings. I can take some photos of how I realised a compressed air
    distribution system if you like
    --
    geoff
     
    geoff, Dec 1, 2003
    #8
  9. Alan

    Andy Wade Guest

    "geoff" wrote in message news:HX5DQmR0Q8y$...

    > 15mm copper pipe isn't spec'd to take the sort of pressures
    > generated by a compressor.


    Really? I've got a (not particularly recent) IMI Yorkshire Tube data sheet
    in front of me. For BS 2871 Table X tube in 15mm size it says that the max.
    working pressure is 58 bar (when used in conjunction with Yorkshire
    fittings). What sort of air compressor did you have in mind...?

    This subject has come up before, at least twice, IIRC. Go Google.

    --
    Andy
     
    Andy Wade, Dec 2, 2003
    #9
  10. Alan

    nightjar Guest

    "Alan" <alz_deane@no_spam.ntlworld.com> wrote in message
    news:NhJyb.2961$...
    > 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?


    Bundy tube (thin wall galvanised steel) is the usual stuff for airlines
    under about 1/2" or so. Not only will it take the fittings without needing
    to adapt them, but it should be cheaper than copper. Look for any airline
    supplier in yellow pages or a trade directory. When copper is used for
    airlines, it is normal to use fully annealed copper, but that may be because
    copper tends to be used only where there are difficult shapes to make.

    Colin Bignell
     
    nightjar, Dec 2, 2003
    #10
  11. Alan

    Alan Guest

    Andy,

    Thanks, this is very helpful.

    Alan.

    "Andy Hall" <> wrote in message
    news:...
    > On Mon, 01 Dec 2003 18:31:46 +0000, "Ed Sirett"
    > <> 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
    >
    > To email, substitute .nospam with .gl
     
    Alan, Dec 2, 2003
    #11
  12. Alan

    nightjar Guest

    "Andy Wade" <> wrote in message
    news:...
    > "geoff" wrote in message news:HX5DQmR0Q8y$...
    >
    > > 15mm copper pipe isn't spec'd to take the sort of pressures
    > > generated by a compressor.

    >
    > Really? I've got a (not particularly recent) IMI Yorkshire Tube data

    sheet
    > in front of me. For BS 2871 Table X tube in 15mm size it says that the

    max.
    > working pressure is 58 bar (when used in conjunction with Yorkshire
    > fittings). What sort of air compressor did you have in mind...?


    Data I have for galvanised steel pipe specifies a maximum working pressure
    for water that is double that for compressed air. The safe working pressure
    is also rated at 1/3 of the maximum working pressure. That would give 15mm
    copper tube a safe working pressure with compressed air of a little under 10
    bar. However, my recollection is that compressed air is not one of the uses
    the manufacturer specifies for this tube.

    Colin Bignell
     
    nightjar, Dec 2, 2003
    #12
  13. Alan

    Andy Wade Guest

    "nightjar .uk.com>" wrote in message
    news:3fccd858$0$27471$...
    >
    > Data I have for galvanised steel pipe specifies a maximum working
    > pressure for water that is double that for compressed air. The safe
    > working pressure is also rated at 1/3 of the maximum working
    > pressure. That would give 15mm copper tube a safe working pressure
    > with compressed air of a little under 10 bar.


    Your comments are noted. The WP given isn't for any specific fluid though.

    > However, my recollection is that compressed air is not one of the
    > uses the manufacturer specifies for this tube.


    The data sheet refers to "gases" without being any more specific.

    --
    Andy
     
    Andy Wade, Dec 3, 2003
    #13
  14. Alan

    nightjar Guest

    "Andy Wade" <> wrote in message
    news:...
    > "nightjar .uk.com>" wrote in message
    > news:3fccd858$0$27471$...
    > >
    > > Data I have for galvanised steel pipe specifies a maximum working
    > > pressure for water that is double that for compressed air. The safe
    > > working pressure is also rated at 1/3 of the maximum working
    > > pressure. That would give 15mm copper tube a safe working pressure
    > > with compressed air of a little under 10 bar.

    >
    > Your comments are noted. The WP given isn't for any specific fluid

    though.

    I would presume it would be for any approved use. The pipes I have data for
    are approved for water, steam, compressed air and non-corrosive gasses,
    hence they have data for those.

    >
    > > However, my recollection is that compressed air is not one of the
    > > uses the manufacturer specifies for this tube.

    >
    > The data sheet refers to "gases" without being any more specific.


    I thought it was specifically 'gas', which I have always taken to mean town
    or natural gas, the pressure of which is measured in inches of water.

    Colin Bignell
     
    nightjar, Dec 3, 2003
    #14
  15. Alan

    Andy Wade Guest

    "nightjar .uk.com>" wrote in message
    news:3fcd59f8$0$14882$...

    >> The data sheet refers to "gases" without being any more specific.

    >
    > I thought it was specifically 'gas', which I have always taken to
    > mean town or natural gas, the pressure of which is measured in
    > Inches of water.


    There's a publication on the CDA web site called "copper tube in buildings"
    which states, amongst many other things, that "copper tubes and fittings are
    also suitable and widely used for [...] chilled water & refrigeration, fire
    sprinkler systems, air conditioning, steam, medical gases, pneumatics,
    hydraulics and waste water.

    I'm still inclined to suspect that the use of steel for air-lines is more to
    do with tradition than anything else. But ICBW.

    --
    Andy
     
    Andy Wade, Dec 3, 2003
    #15
  16. "Andy Wade" <> wrote in message
    news:...
    > "nightjar .uk.com>" wrote in message
    > news:3fcd59f8$0$14882$...
    >
    > >> The data sheet refers to "gases" without being any more specific.

    > >
    > > I thought it was specifically 'gas', which I have always taken to
    > > mean town or natural gas, the pressure of which is measured in
    > > Inches of water.

    >
    > There's a publication on the CDA web site called "copper tube in

    buildings"
    > which states, amongst many other things, that "copper tubes and fittings

    are
    > also suitable and widely used for [...] chilled water & refrigeration,

    fire
    > sprinkler systems, air conditioning, steam, medical gases, pneumatics,
    > hydraulics and waste water.
    >
    > I'm still inclined to suspect that the use of steel for air-lines is more

    to
    > do with tradition than anything else. But ICBW.
    >
    > --
    > Andy
    >
    >


    And really imho iron / steel pipes should be avoided if only because they
    WILL eventually rust inside from the condensation in the compressed air.
    Instructions for running galv or black iron air services always used to
    include a 'dead vertical stub' where a vertical run meets a horizontal one,
    comprising a Tee with a dead stub pointing downwards to catch the rust
    flakes in a place they could relatively easily be removed.

    Andrew Mawson
     
    Andrew Mawson, Dec 3, 2003
    #16
  17. Alan

    Steve Firth Guest

    "nightjar" <nightjar@<insert_my_surname_here> wrote:

    > > The data sheet refers to "gases" without being any more specific.

    >
    > I thought it was specifically 'gas', which I have always taken to mean town
    > or natural gas, the pressure of which is measured in inches of water.


    15 mm copper tube is approved for the distribution of gases in
    laboratories and hospitals. Oxygen is commonly provided to the bedside
    via 15 mm tube with soldered fittings.

    --
    Having problems understanding usenet? Or do you simply need help but
    are getting unhelpful answers? Subscribe to: uk.net.beginners for
    friendly advice in a flame-free environment.
     
    Steve Firth, Dec 3, 2003
    #17
  18. Alan

    Andy Hall Guest

    On Wed, 3 Dec 2003 08:16:23 -0000, "Andy Wade"
    <> wrote:

    >"nightjar .uk.com>" wrote in message
    >news:3fcd59f8$0$14882$...
    >
    >>> The data sheet refers to "gases" without being any more specific.

    >>
    >> I thought it was specifically 'gas', which I have always taken to
    >> mean town or natural gas, the pressure of which is measured in
    >> Inches of water.

    >
    >There's a publication on the CDA web site called "copper tube in buildings"
    >which states, amongst many other things, that "copper tubes and fittings are
    >also suitable and widely used for [...] chilled water & refrigeration, fire
    >sprinkler systems, air conditioning, steam, medical gases, pneumatics,
    >hydraulics and waste water.
    >
    >I'm still inclined to suspect that the use of steel for air-lines is more to
    >do with tradition than anything else. But ICBW.


    I spoke with Thomas Wright Ltd (mentioned earlier) on this.

    They sell and install systems as well as the components and told me
    that various pipe materials are used, including steel, copper
    (standard table X), nylon and more recently aluminium (also with push
    fittings - apparently this is popular in continental Europe.

    I asked them to contrast the different methods, and they did comment
    that this is an industry with conservative habits.

    Steel is popular through tradition and cheapness, but is hard work to
    install. One needs to have the ability to thread the pipes and
    installations have to be done in a specific order so that the pieces
    screw together in order.

    Copper is also widely used and generally they recommend compression
    fittings for ease of installation - again it was what is commonly used
    - although apparently there is not an issue with using solder fittings
    if preferred.

    Nylon is used for speed and ease of installation, but not recommended
    where there is a risk of mechanical damage. Overall, the material
    costs including fittings are similar to copper if compression fittings
    are used with copper.

    In all of the cases, it is recommended to design the system as a loop
    run high up around the workshop with a drop to take the feed from the
    compressor. A drip leg with an automatic drain is recommended for at
    least one corner and the pipework should be arranged to slope to this
    point. At each drop point to an outlet on the wall, there should be
    a tee pointing upwards and then two elbows to take the pipe down the
    wall. This avoids water running down the outlet drops.
    Regulator/filter/lubricators can be fitted as required.



    ..andy

    To email, substitute .nospam with .gl
     
    Andy Hall, Dec 3, 2003
    #18
  19. Alan

    Dave Guest

    "Andy Wade" <> wrote in message news:<>...
    > "geoff" wrote in message news:HX5DQmR0Q8y$...
    >
    > > 15mm copper pipe isn't spec'd to take the sort of pressures
    > > generated by a compressor.

    >
    > Really? I've got a (not particularly recent) IMI Yorkshire Tube data sheet
    > in front of me. For BS 2871 Table X tube in 15mm size it says that the max.
    > working pressure is 58 bar (when used in conjunction with Yorkshire
    > fittings). What sort of air compressor did you have in mind...?


    Copper will be fine, you just have to make sure you use either
    compression fittings or HARD soldered (brazed) joints. That's how all
    the medical gases in your local hospital are piped (working pressure
    max 7 bar).

    Dave
     
    Dave, Dec 3, 2003
    #19
  20. "Dave" <> wrote in message
    news:...
    > "Andy Wade" <> wrote in message

    news:<>...
    > > "geoff" wrote in message news:HX5DQmR0Q8y$...
    > >
    > > > 15mm copper pipe isn't spec'd to take the sort of pressures
    > > > generated by a compressor.

    > >
    > > Really? I've got a (not particularly recent) IMI Yorkshire Tube data

    sheet
    > > in front of me. For BS 2871 Table X tube in 15mm size it says that the

    max.
    > > working pressure is 58 bar (when used in conjunction with Yorkshire
    > > fittings). What sort of air compressor did you have in mind...?

    >
    > Copper will be fine, you just have to make sure you use either
    > compression fittings or HARD soldered (brazed) joints. That's how all
    > the medical gases in your local hospital are piped (working pressure
    > max 7 bar).
    >
    > Dave


    A properly made soft soldered joint should be fine for compressed air up to
    100 psi.

    You would have no qualms in using soft soldered joints for a rising main,
    and the pressure there could easily be more.

    I would however avoid soft soldered joints where there might be compressor
    vibrations.

    Andrew Mawson
     
    Andrew Mawson, Dec 3, 2003
    #20
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