<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META http-equiv=Content-Type content="text/html; = charset=iso-8859-1"> <META content="MSHTML 6.00.2800.1400" name=GENERATOR> <STYLE></STYLE> </HEAD> <BODY bgColor=#ffffff> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>Thanks for that, Rob.  I remember = a neighbor saying sometime ago that pvc was not to be used for air though it is = rated for 600 lbs pressure.</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>I've had it in my ceiling for = years.  I was oot and aboot today (little canydian lingo there.)  Home Depot has = red copper and blue copper but don't know the difference.  A plumbing = shop down the street, said that it was the thickness of the copper.  There is = green, blue and red.  He said that Green is made for air and is cleaned on = the inside (used in hospitals etc.)  Also expensive.  = </FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>The link said that ABS is okay, but = they don't make it in less than 1 1/2 inches.</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>Here's my beef!  I haven't been = able to get pressure rating anywhere.  I spent an hour on the net and looked at = McMaster Carr etc.  Lotsa rhetoric but no specs.  I'm sure the = rating depends on the diameter.</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>I give up.  Guess I'll just go = with 1/2 inch blue and hope it works.  </FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>BTW, I love air.  Except from politicians.</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>Carl Meyer Ptg assoc<BR>Santa Clara, Ca.</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <BLOCKQUOTE dir=ltr style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; = BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px"> <DIV style="FONT: 10pt arial">----- Original Message ----- </DIV> <DIV style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: = black"><B>From:</B> <A title=rrg@unlv.nevada.edu href="mailto:rrg@unlv.nevada.edu">Rob = Goodale</A> </DIV> <DIV style="FONT: 10pt arial"><B>To:</B> <A = title=pianotech@ptg.org href="mailto:pianotech@ptg.org">'Pianotech'</A> </DIV> <DIV style="FONT: 10pt arial"><B>Sent:</B> Thursday, March 18, 2004 = 8:24 AM</DIV> <DIV style="FONT: 10pt arial"><B>Subject:</B> Journal Artical - BAD IDEA!</DIV> <DIV><BR></DIV> <DIV><FONT face=Arial size=2>Journal Article - BAD = IDEA!</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>I was reading an article in he latest = PTG Journal, (March, 2004), when I identified a <U>major</U> hazardous no-no.  The article is on page 25, "Finishing Pianos:  = <U>The Jewels of the Furniture World, Part 6.</U></FONT></DIV> <DIV><FONT face=Arial size=2><U></U></FONT> </DIV> <DIV><FONT face=Arial size=2>In the article it recommends using = PVC pipe for plumbing your shop with compressed air to a stationary = compressor.  This is a subject that I had already been exploring, as I am intending on = plumbing my shop for compressed air with multiple tap points throughout the shop.</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>Here is the problem:  PVC is = designed for transporting non-flammable liquids, i.e. water, NOT compressed air or gasses.  Under pressure PVC becomes very rigid and non-flexible.  PVC plastic does not expand, it explodes!  In = such an event it shatters like glass sending flying shards in every = direction.  There have been mulitiple reports of serious injury resulting from = exploding PVC line being used for compressed air, including the relatively low, = (55-130 PSI) pressures generated by common shop compressors.  It is = tempting to use PVC because of it's cheapness, easy installation, and high = resistance to corrosion.  Unfortunately it is not a wise solution.  Use = copper or steel pipe only, <U>not</U> PVC!!!</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>The following links will take you to = credible data on why not to do this, (including OSHA data which forbids = PVC for compressed air).</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2><A = href="http://wolfstone.halloweenhost.com/LocalMirror/hib19880520.mht">h= ttp://wolfstone.halloweenhost.com/LocalMirror/hib19880520.mht</A></FONT><= /DIV> <DIV><FONT face=Arial size=2><A = href="http://www.lni.wa.gov/Safety/KeepSafe/HazAlerts/902.ahttp://wolfs= tone.halloweenhost.com/LocalMirror/hib19880520.mhtsp">http://www.lni.wa.g= ov/Safety/KeepSafe/HazAlerts/902.ahttp://wolfstone.halloweenhost.com/Loca= lMirror/hib19880520.mhtsp</A><A = href="http://wolfstone.halloweenhost.com/LocalMirror/hib19880520.mht"><= /A></FONT></DIV> <DIV><FONT face=Arial size=2><A = href="http://www.woodcentral.com/bparticles/airpiping.shtml">http://www= .woodcentral.com/bparticles/airpiping.shtml</A></FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>Rob Goodale, RPT</FONT></DIV> <DIV><FONT face=Arial size=2>Las Vegas, NV</FONT></DIV></BLOCKQUOTE></BODY></HTML>