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  #1   Report Post  
CampinGazz
 
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Default plastic air pipe

i remember from here a year or so ago that there was great debates over the
use of plastic pipe for workshop air compressor piping, i think in american
they use scedule 40 pipe??

anyway, i know plastic pipe shouldent be used for this use, as if the pipe
ever fractures, it does so explosively when it's got 150 psi of air pressure
inside it,
and i have a habit of sending things flying in my workshop every now and
then, broke a few fluorescent lights, and even cut a power cable once when a
piece of wood flew from a tool.. i know i should be more carefull, but
everyone gets kick back sometime, mine tend to fly upwards.. where the air
pipes will be ran.

Anyway, i was going to use copper pipe, but got the new axminster review
magazine through the door today, and they have in it a plastic air pipe
system,

ok, their pipe is sold as nylon pipe, is this different to the usual pvc
pipe used in america (i'm in the UK if your still guessing i.e is the
nylon pipe safe if it ever ruptures, i'd imagine it'll be resistiant to
rupturing if it gets hit, as nylon pipe shouldent be as brittle as pvc pipe,
but before i look into getting some 15mm nylon pipe from a local supplier,
i'd like to know if this is a good idea?

i know most people say pvc pipe for air systems is not a good idea, but it's
still sold and people use it, most without incidnet,

Is nylon pipe a good idea? it's sure make my pipework a lot easier, as i'd
like to run the pipes on the top of the celing joists, and can't do that
with copper pipe unless i cut it into 2 foot sections and thread it between
the rafters/joists.

So nylon pipe would be perfect,
i imagine it needs to be a certian type of nylon pipe? i'm using some nylon
water pipe in my motorhome i'm building, this stuff is the same diamiter as
the axminster stuff..15mm, not sure about hte thickness, but my pipe costs
78 pence per meter, whereas axminster want about a tenner for 1.5 meters,


  #2   Report Post  
KYHighlander
 
Posts: n/a
Default plastic air pipe

I believe I'd try the stuff you are using on your motor home. PVC might
through plastic shrapnel is what I guess would be the danger in it, but the
nylon would hold together rather than splinter.If the cheap stuff didn't
work then it would be an inexpensive lesson.

--

http://users.adelphia.net/~kyhighland


"CampinGazz" wrote in message
...
i remember from here a year or so ago that there was great debates over

the
use of plastic pipe for workshop air compressor piping, i think in

american
they use scedule 40 pipe??

anyway, i know plastic pipe shouldent be used for this use, as if the pipe
ever fractures, it does so explosively when it's got 150 psi of air

pressure
inside it,
and i have a habit of sending things flying in my workshop every now and
then, broke a few fluorescent lights, and even cut a power cable once when

a
piece of wood flew from a tool.. i know i should be more carefull, but
everyone gets kick back sometime, mine tend to fly upwards.. where the air
pipes will be ran.

Anyway, i was going to use copper pipe, but got the new axminster review
magazine through the door today, and they have in it a plastic air pipe
system,

ok, their pipe is sold as nylon pipe, is this different to the usual pvc
pipe used in america (i'm in the UK if your still guessing i.e is the
nylon pipe safe if it ever ruptures, i'd imagine it'll be resistiant to
rupturing if it gets hit, as nylon pipe shouldent be as brittle as pvc

pipe,
but before i look into getting some 15mm nylon pipe from a local supplier,
i'd like to know if this is a good idea?

i know most people say pvc pipe for air systems is not a good idea, but

it's
still sold and people use it, most without incidnet,

Is nylon pipe a good idea? it's sure make my pipework a lot easier, as i'd
like to run the pipes on the top of the celing joists, and can't do that
with copper pipe unless i cut it into 2 foot sections and thread it

between
the rafters/joists.

So nylon pipe would be perfect,
i imagine it needs to be a certian type of nylon pipe? i'm using some

nylon
water pipe in my motorhome i'm building, this stuff is the same diamiter

as
the axminster stuff..15mm, not sure about hte thickness, but my pipe costs
78 pence per meter, whereas axminster want about a tenner for 1.5 meters,




  #3   Report Post  
Mark Jerde
 
Posts: n/a
Default plastic air pipe

Please also post this message in rec.crafts.metalworking

There have been many discussions about compressed air piping, and there are
many people with hands-on experience.

-- Mark



  #4   Report Post  
Young_carpenter
 
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Default plastic air pipe

I'll bite and jump in
PVC an Nylon are a world away in terms of their chemistry. PVC is more like
Vinyl siding and Nylon more like what your wife wears on her legs. Nylon
probably won't splinter the same as PVC. I would think "Nylon" pipe would
be a flexible pipe. And I definitely would have a grounding system on the
pipe, Nylon is extremely easy to charge.
As for "is my water pipe different than my air pipe?" Yes almost always.
Air is a different property than water and most water pipes won't build up
150-200 psi (if it did it would hurt like anything when you ran the shower).
Ok that is my deduction.

--


"CampinGazz" wrote in message
...
i remember from here a year or so ago that there was great debates over

the
use of plastic pipe for workshop air compressor piping, i think in

american
they use scedule 40 pipe??

anyway, i know plastic pipe shouldent be used for this use, as if the pipe
ever fractures, it does so explosively when it's got 150 psi of air

pressure
inside it,
and i have a habit of sending things flying in my workshop every now and
then, broke a few fluorescent lights, and even cut a power cable once when

a
piece of wood flew from a tool.. i know i should be more carefull, but
everyone gets kick back sometime, mine tend to fly upwards.. where the air
pipes will be ran.

Anyway, i was going to use copper pipe, but got the new axminster review
magazine through the door today, and they have in it a plastic air pipe
system,

ok, their pipe is sold as nylon pipe, is this different to the usual pvc
pipe used in america (i'm in the UK if your still guessing i.e is the
nylon pipe safe if it ever ruptures, i'd imagine it'll be resistiant to
rupturing if it gets hit, as nylon pipe shouldent be as brittle as pvc

pipe,
but before i look into getting some 15mm nylon pipe from a local supplier,
i'd like to know if this is a good idea?

i know most people say pvc pipe for air systems is not a good idea, but

it's
still sold and people use it, most without incidnet,

Is nylon pipe a good idea? it's sure make my pipework a lot easier, as i'd
like to run the pipes on the top of the celing joists, and can't do that
with copper pipe unless i cut it into 2 foot sections and thread it

between
the rafters/joists.

So nylon pipe would be perfect,
i imagine it needs to be a certian type of nylon pipe? i'm using some

nylon
water pipe in my motorhome i'm building, this stuff is the same diamiter

as
the axminster stuff..15mm, not sure about hte thickness, but my pipe costs
78 pence per meter, whereas axminster want about a tenner for 1.5 meters,





  #5   Report Post  
Steve Dunbar
 
Posts: n/a
Default plastic air pipe

There is a plastic pipe sold in the US specifically for compressed air use.
It is _not_ PVC pipe, which is dangerous and illegal to use for compressed
air. This stuff is usually colored green and is made from ABS. Chem-Aire is
one brand name. It is much more expensive than PVC pipe. It is not
compatible with some synthetic compressor oils. I don't know if this pipe
is available in England.

A forklift driver at work broke one of these green plastic air lines a while
back. It did not throw shrapnel like a PVC pipe would have.


--
--
Steve


  #6   Report Post  
Frank Campbell
 
Posts: n/a
Default plastic air pipe

In article , Steve Dunbar
wrote:

There is a plastic pipe sold in the US specifically for compressed air use.
It is _not_ PVC pipe, which is dangerous and illegal to use for compressed
air. This stuff is usually colored green and is made from ABS. Chem-Aire is
one brand name. It is much more expensive than PVC pipe. It is not
compatible with some synthetic compressor oils. I don't know if this pipe
is available in England.

A forklift driver at work broke one of these green plastic air lines a while
back. It did not throw shrapnel like a PVC pipe would have.


We use a type of plastic pipe on the printing presses in our plant,
this is 1/4" ID and up to 90 PSI, it is usually black and semi rigid,
depending on the supplier, when it blows it is usually just a pin hole
that you can hear hissing.

--
http://sawdustmaking.com
  #7   Report Post  
Jim Wilson
 
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Default plastic air pipe

Young_carpenter wrote...

(BTW, I really don't know, but I'd be surprised if the plastic pipe
that's suitable for compressed air is nylon. It might be a polyethylene
or polypropylene, though.)


Air is a different property than water and most water pipes won't build up
150-200 psi (if it did it would hurt like anything when you ran the shower).


The key is in the differences in volume under pressure and under no
pressure. Under even 120 psi, water compresses very, very little. So,
when water expands due to a breach in PVC pipe, it doesn't move far
before all the pressure is released. OTOH, when gas is compressed to 120
psi, it occupies only a fraction of its zero-pressure volume. When the
pipe fails, the gas rapidly expands back to its original volume, taking
shards of PVC along for the ride.

Jim
  #8   Report Post  
mike
 
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Default plastic air pipe

Use rubber hose where you need flexibile pipe, probably cheaper than nylon.

mike
  #9   Report Post  
Thomas Bunetta
 
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Default plastic air pipe

I had a hydraulic hose made up with std. pipe thread ends to act as a
flexible coupling from compressor to galvanized plumbing.
Tom
"mike" wrote in message
om...
Use rubber hose where you need flexibile pipe, probably cheaper than

nylon.

mike



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