On Wed, 18 Feb 2015, Scott wrote:
> I'd never recommend PVC lines, but I've spent a lot of time around them. The
> one time one blew, it didn't spray the room with lethal shards.
The last time I took a grinder to a piece of metal, a shard bounced
harmlessly off my cheek. Now I figure there's no reason to wear eye
protection.
It'd be one thing if it was just copper and steel pipe manufacturers
telling everyone not to use PVC, since they'd have an obvious ulterior
motive. But every single maker of PVC pipe tells everyone not to use
their product for compressed air ( in addition to OSHA and well, everybody
else ).
<http://www.harvel.com/piping-systems/gf-harvel-pvc-industrial-pipe/schedule-40-80/temperature-derating>
Just that chart alone should be enough to convince even the cheapest,
most-safety-averse person that PVC for compressed air is stupid. Average
compressor outlet temperature is around double the rating for the pipe...
and at half that temperature, the pipe strength is basically maxed out by
a typical compressor ( 600 psi * .22 de-rate for 140* = 132 psi when brand
new! ).
If you consider a safety margin of zero acceptable, then I guess I have
no further comment.
--
David Hillman
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