Shop Floor Talk  

Go Back   Shop Floor Talk > Welding and Metalworking Forums > Shop & Safety

SFT Search:   
Reply
 
Thread Tools Display Modes
  #91  
Old 03-08-2006, 11:54 AM
cutter's Avatar
cutter cutter is offline

12-29-1943 to 1-17-2020
Curmudgeon emeritus
 
Join Date: Jun 2004
Location: Lubbock,Texas
Posts: 33,110
Default

Well gagiii, since no one else seems to be biting - as best I recall - the answer is something like this:
while pvc may be rated to handle the pressure you intend to run, it can degrade over time & become brittle & when it does blow, there tends to be a situation with sharp plastic shards flying all over the place.
When iron pipe gives, it generally just splits & whistles.
I don't have any personal experience with plastic air lines but I danged sure have encountered old pvc that would shatter like egg shells & that was enough to convince me. I guess I've reached the age where I prefer the drama in my life to be tamer.
I do know we've had a few brave guys report that they've been using pvc air lines for years with no problems but it generally is regarded as a needless danger.
__________________
cutter
Housekeeping Staff: the Gatekeeper
Director of Policy, Syntax and Grammar (by appointment)

"Dr. Chandran, will I dream?"

Just Keep Walking

"I am not a body, I am free.
For I am still as God created me."
Reply With Quote
  #92  
Old 03-08-2006, 12:03 PM
X-ray's Avatar
X-ray X-ray is offline
Elite Member
 
Join Date: Jun 2004
Location: Northern Nevada
Posts: 1,419
Default

Quote:
Originally Posted by gagiii
I know that it has probably been answered here before but Why do you guys recomend using metal pipe for your air supply instead of PVC?
just wondering and thanks
Once at work we went the pvc route to pipe air outside to blow out saws at multiple workstations...worked fine for a summer or two, but the sun had its way (unpainted) with the plastic...it was actually pretty funny when the crap came apart...I was younger then and thought flying **** and people cringing with fear was quite hilarious :evil:

I think another reason metal is consider premo, is in conducting temperature differences between compressed air and the atmosphere-think drain valves and such condensation type phenom I think
__________________
Does anything happen to me? I take what comes... -Marcus Aurelius
Reply With Quote
  #93  
Old 03-08-2006, 12:07 PM
gagiii
Guest
 
Posts: n/a
Default

Quote:
Originally Posted by cutter
Well gagiii, since no one else seems to be biting - as best I recall - the answer is something like this:
while pvc may be rated to handle the pressure you intend to run, it can degrade over time & become brittle & when it does blow, there tends to be a situation with sharp plastic shards flying all over the place.
When iron pipe gives, it generally just splits & whistles.
I don't have any personal experience with plastic air lines but I danged sure have encountered old pvc that would shatter like egg shells & that was enough to convince me. I guess I've reached the age where I prefer the drama in my life to be tamer.
I do know we've had a few brave guys report that they've been using pvc air lines for years with no problems but it generally is regarded as a needless danger.
thanks cutter, so other than a line rupture there is no other problem? I was thinking that maybe it had something to do with moisture build up or maybe more trash in the lines. I'll have to think about the fragmentational bomb problem. I've had my old shop pipedwith PVC for about 7 years and had no trouble, (yet). Sure is easier and cheaper

thanks again
Reply With Quote
  #94  
Old 03-08-2006, 12:45 PM
Big Al
Guest
 
Posts: n/a
Default

Quote:
Originally Posted by gagiii
I know that it has probably been answered here before but Why do you guys recomend using metal pipe for your air supply instead of PVC?
just wondering and thanks
Another reason is that when the air hose gets tripped over or pulled unexpectedlly it is harder to damage the line. If you use pvc run it into a brass elbow that has ears to secure end. Also heat & vibabration is a problem on some large compressors expecially with high flow rates. I have seen several kinds of plastic pipe melt, expand from excessive heat with pressure added. Not good
Reply With Quote
  #95  
Old 03-08-2006, 08:11 PM
RED caddy's Avatar
RED caddy RED caddy is offline

10-28-1951 to 4-19-2021
Da Chief
 
Join Date: Aug 2004
Location: Venice, Florida
Posts: 5,556
Default The air supply dance

GAGiii, I've had several shops piped with PVC and CPVC and never had a problem. That said, I have seen 2 other guy's that wern't as lucky, one failure was on an outside supply line to a 2 post lift, cut an employee pretty bad with a flying piece of plastic with a brass valve attached. the other was a 2 in. line running along the wall in a leanto shed that took out several hanging lights and a cabinet door,along with the back glass in a customer car.
I'm going with a hard drawn brass tubing system in my new shop, (type L) a perimiter loop with top tap drops every 10 feet and an outside connection by each door, compressor on one end and a 60 gal. volume tank on the other with a "Franzinator" style dryer rig. I guess, like some of the other "Old Dogs" I don't need the drama PVC provides. check out this thread about shop air, http://www.garagejunkies.net/showthr...ight=air+lines That forum has a ton of good info about shop air install's, some of it is mine. well worth the read time before you start building yours. RED
__________________
A 160 MPH drive, down a 2 lane blacktop, all by yourself, is NOT anti-social behaviour... I drag race because football, baseball, and golf only need ONE ball. Paul.


What I really need to know is, WHEN DOES THE SHOOTING START?

Last edited by RED caddy; 03-08-2006 at 08:14 PM. Reason: I dont spell gud.
Reply With Quote
  #96  
Old 03-09-2006, 07:55 AM
gagiii
Guest
 
Posts: n/a
Default

thanks everybody, Ya'll have given me a lot to think about.
Reply With Quote
  #97  
Old 03-13-2006, 08:55 AM
gagiii
Guest
 
Posts: n/a
Default Freebies

Thought I'd start out with a few pics of some of the free stuff that I've accumulated for the shop.
first is a roll up door
second is the use of this lift
third is the underground wire to go from the meter base to the shop
Attached Thumbnails
Click image for larger version

Name:	shop pics 021206 002.jpg
Views:	237
Size:	92.0 KB
ID:	10739   Click image for larger version

Name:	shop pics 031206 011.jpg
Views:	247
Size:	93.0 KB
ID:	10740   Click image for larger version

Name:	shop pics 031206 012.jpg
Views:	240
Size:	89.0 KB
ID:	10741   Click image for larger version

Name:	shop pics 031206 014.jpg
Views:	243
Size:	89.0 KB
ID:	10742  
Reply With Quote
  #98  
Old 03-13-2006, 09:10 AM
gagiii
Guest
 
Posts: n/a
Default Now let the work begin!!

We went thursday afternoon and picked up the lift. Started work friday morning. My neighbor, Dale, my brother, Clay, and my self. We managed to get things lined out and set 9 trusses the first day.
Attached Thumbnails
Click image for larger version

Name:	shop pics 021206 012.jpg
Views:	221
Size:	95.0 KB
ID:	10743   Click image for larger version

Name:	shop pics 021206 018.jpg
Views:	209
Size:	94.0 KB
ID:	10744   Click image for larger version

Name:	shop pics 021206 028.jpg
Views:	203
Size:	87.0 KB
ID:	10745   Click image for larger version

Name:	shop pics 021206 037.jpg
Views:	202
Size:	85.0 KB
ID:	10746   Click image for larger version

Name:	shop pics 021206 049.jpg
Views:	209
Size:	88.0 KB
ID:	10747  

Reply With Quote
  #99  
Old 03-13-2006, 09:16 AM
gagiii
Guest
 
Posts: n/a
Default saturday

on saturday we got the last six trusses up and about half the lathe on.
Attached Thumbnails
Click image for larger version

Name:	shop pics 021206 004.jpg
Views:	205
Size:	88.0 KB
ID:	10748   Click image for larger version

Name:	shop pics 021206 009.jpg
Views:	205
Size:	92.0 KB
ID:	10749   Click image for larger version

Name:	shop pics 021206 010.jpg
Views:	214
Size:	91.0 KB
ID:	10750  
Reply With Quote
  #100  
Old 03-13-2006, 09:19 AM
gagiii
Guest
 
Posts: n/a
Default sunday

well we finished up the lathing sunday. First pic is my homemade truss brackets
Attached Thumbnails
Click image for larger version

Name:	shop pics 031206 001.jpg
Views:	231
Size:	89.0 KB
ID:	10751   Click image for larger version

Name:	shop pics 031206 006.jpg
Views:	227
Size:	89.0 KB
ID:	10752   Click image for larger version

Name:	shop pics 031206 007.jpg
Views:	241
Size:	87.0 KB
ID:	10753  
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Web Search:

All times are GMT -5. The time now is 08:04 PM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2022, vBulletin Solutions Inc.