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Thread: copper or steel
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16-10-2009, 07:57 PM #1
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copper or steel
Why we use in CFC gas Copper pipe and we do not use steel pipe ?
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16-10-2009, 10:55 PM #2
Re: copper or steel
which is easier to work with and less likely to contaminate?
mmm to beer or not to beer...........lets drink breakfast
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17-10-2009, 01:55 AM #3
Re: copper or steel
Actually many larger systerms are piped in steel. It works very well where the strength of steel piping is required. It is of course more difficult to insure cleanliness.
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22-10-2009, 03:58 AM #4
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22-10-2009, 05:42 AM #5
Re: copper or steel
Hi Sledge.
Yep NH3LVR'S is correct.
Check out any large cold store if you get the chance.
Preferably the older ones on R22. (all Steel pipework ).
Although Copper seems to be the favourite nowadays. It used to be a cheaper option but with the price of copper now.
I am not so sure?
Cheers Grizzly.
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22-10-2009, 07:29 AM #6
Re: copper or steel
It depends on the end user also. Some of the bigger company now adays like some of the piping being stainless steel!
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22-10-2009, 04:46 PM #7
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22-10-2009, 08:28 PM #8
Re: copper or steel
Slightly off subject, I was watching a gas contractor fitting a 24" plastic pipe (or should I say man made material) The pipe came in a large radius coil. They unrolled ito the trench, when it came to the joining of the next piece, I ask how long to join (welding) the reply was to X ray standard a long time, how long I said?
"nearly an hour" They had this fancy machine, whipped around the pipe in no time.
So I decided to do a bit of research (I was at this time looking at a NH3 job with a really long "main") Got on to the design engineers, gave them some spec, temps, pressures, ammoina and hydros ammoinia.
They came back that they saw no problem using plastic pipe. I wonder if any body has used this before?
PS; Did not have the balls to even but in front of the client!
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23-10-2009, 12:55 AM #9
Re: copper or steel
mad fridgie,
probably a good call regarding plastic pipe, should be referred to SGS for clarification. They struggled with sched., 10 stainless to replace sched., 40 steel.
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23-10-2009, 01:05 AM #10
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23-10-2009, 03:55 AM #11
Re: copper or steel
Carbon or stainless steel works fine. Plastic is not recommended and not listed as acceptable refrigerant pipe here in the US.
I've used carbon or stainless on custom built packages to provide increased durability. Copper is essentially a weak material for some applications.If all else fails, ask for help.
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23-10-2009, 05:46 AM #12
Re: copper or steel
Aluminium clad tube, with copper outer flashing seems to be fairly popular in SE Asia, due to the copper price.
Engineering Specialist - Cuprobraze, Nocolok, CD Technology
Rarefied Technologies ( SE Asia )
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23-10-2009, 03:25 PM #13
Re: copper or steel
Hi, all
... they saw no problem
... I was using PE pipes for brine CaCl2 (calcium chloride) for ice cream machine .... too much contraction ... all hangers were movable ... night mare to install it in a proper way ... but regarding of nature of CaCl2 we had to use plastic pipes and iridium HE
.... plastic is maybe good for positive temperature ... but at -40C/F of liquid ammonia .... I'll keep with LTCS and with SS ...
of course maybe I'm not right ....
Best regards, Josip
It's impossible to make anything foolproof because fools are so ingenious...
Don't ever underestimate the power of stupid people when they are in large groups.
Please, don't teach me how to be stupid....
No job is as important as to jeopardize the safety of you or those that you work with.
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23-10-2009, 03:34 PM #14
Re: copper or steel
Originally Posted by Josip
No, I would say you are right. I would not use plastic for anything except low pressure water piping or gravity drain lines (PVC). Using plastic on ammonia piping would be a disaster IMO.
Calcium Chloride was used for years with carbon steel pipe. One of the issues I remember is that you have to check the pH of the brine. It can absorb oxygen from the atmosphere, which causes the pH to change. Then the brine becomes very aggressive in corroding the pipe. I saw this first hand on an old ice skating rink that used an atmospheric open tank for the brine system. It was not good, let me tell you....If all else fails, ask for help.
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