[SEL] air lines in shop?

Mon Nov 1 09:53:02 PDT 2010

Hi All,
  As a side note: You can greatly increase the life of your single 
stage compressor sold to you as capable of 150 by setting the cut off 
down to 125.  Years ago single stage compressors were originally 
intended for 100 psi max. Then 40-50 years ago they started cheating 
them up to 125.  In the 60s and 70s a major chain store started to 
sell them set up for 135-145. Now companies are cheating them again 
up to the 150 range. Hell they will pump up to 200 if you force them. 
They will do it in the short run but it does take life off of the 
pump in the long run to take the air from 14.5psi (depending on your 
altitude), up to 150 all in one step. If you can work with the lesser 
pressure you will gain a lot in the long run.  You the user will 
never know what you loose by using the higher pressure.  And very few 
of the sales people at the big box stores know much more then what 
the manufacturers sales propaganda states. So asking them about this 
subject will gain you little to none.
Yes manufacturers have done some (and thats being generous to say 
that.) improvements to valves to increase durability at the higher 
pressures but the fact remains you can gain a lot by making do with 
less.  Most air tools are designed for operation at 90 psi on 
average. And to use them on pressures up in the triple digits is hard 
on them too.
Its a game of numbers, you claim larger numbers of delivery or 
pressure then your competition you sell more.

As an added benefit lesser pressure means cooler air thus less water 
in your air as the separators can do a better job.          Mark

At 07:40 AM 11/1/2010, you wrote:
>Yes, my compressor is set to a cutoff of about 150 as well. It's a
>single-stage 5 hp.
>So I need to be safe to over 150 - I'd feel better with 180-200 psi range
>just in case......
>
>Bill
>
>
> >
> >
> >  For what its worth;
> > I Piped a shop where I was Port Engineer, at the very least,
> > 25+ years ago with PVC. What I used was the hot water,
> > Schedule 80 , 1" pipe.  All joints were properlly cleaned,
> > glued, let stand for several days prior to use.
> > All lines were well up on the walls, with drop pipes & traps
> > to drain off water, all pipes were well supported.
> > The Compressor cut off setting was 150 PSI.
> >
> > This system is still in use daily with no leaks & never a problem.
> >
> > And it seemed that the plastic produced less water in the air than
> > metal piping.
> >
> > I seem to remember asking the supplier what to use for the App.
> > and the Hot Water Sch. 80 PVC was recommended {Then}.
> >
> > { Just my experience}
> >
> >
> >                   Best Regards
> >
> >            Franklin S. Skinner
> >       Marine Surveyor & Consultant
> > 3428 Talon Court Wilmington NC 28409
> >        34'10.9 North 74'52.4 West
> > PH 910-791-8870  Cell 910-612-7470
> >
> >
> >
> >
> >
> >
> >> From: plowe at exemail.com.au
> >> To: sel at lists.stationary-engine.com
> >> Date: Mon, 1 Nov 2010 20:27:42 +1100
> >> Subject: [SEL] air lines in shop?
> >>
> >> There are typical designs for shop air supplies, depends how technical
> >> you
> >> want to go.
> >> http://www.ch601.org/tools/Neil/pipe-layout-1.pdf
> >> If it is for blow down only then straight compressed air is fine, if you
> >> want to paint and need dry air then you need good filters and water
> >> traps.
> >> If you are really rich you can add a refrigerant dryer.
> >> It can get very humid where I live and that can be a problem when spray
> >> painting, I use an automatic blow-down water trap that sometimes works
> >> overtime.
> >>
> >> I have used polyurethane tubing for over 30 years in heavy industry in
> >> Industrial Instrumentation and have run 1000's of kilometres of the
> >> stuff,
> >> never had a blow-out using the black UV stabilized stuff. The coloured
> >> and
> >> clear does not like the sun too much. Polyurethane good for 115 psi or
> >> if
> >> you want higher pressures go to Nylon for 225 psi, but it is not as
> >> flexible.
> >> I use SMC Pneumatics, an international company.
> >> SMC use "One Touch" Fittings, look here and at the left hand menu:
> >> http://www.smcpneumatics.com/products/fittings/instantfittings/index.php
> >>
> >> I am an Electgrical contractor and Industrial Instrument Technician
> >> (Flow,
> >> Pressure, Level and Temp controls), the latter has been my main trade
> >> for
> >> over 30 years. I would not be bothered cutting and screwing gal or black
> >> pipe or even copper when this tubing is available. I would say used in
> >> all
> >> industries in Australia.
> >> My $0.02 worth and experience.
> >>
> >> Regards
> >> Peter Lowe
> >> R&V Engine Registrar
> >> Australia
> >> http://www.oldengine.org/members/plowe/rv-engines/rvpage.htm
> >> Skype name: ozengines
> >>
> >>
> >> _______________________________________________
> >> SEL mailing list
> >> SEL at lists.stationary-engine.com
> >> http://www.stationary-engine.com/mailman/listinfo/sel
> >
> > _______________________________________________
> > SEL mailing list
> > SEL at lists.stationary-engine.com
> > http://www.stationary-engine.com/mailman/listinfo/sel
> >
>
>
>_______________________________________________
>SEL mailing list
>SEL at lists.stationary-engine.com
>http://www.stationary-engine.com/mailman/listinfo/sel

Mark Shulaw
454 County Road 33
Bluffton, OH. 45817
USA

Frappi at wcoil.com / 419.358.5206  Home / 419.516.2996 Ver. Cell.
Hobby Collector and Dealer in Maytag Multi-Motor Engine parts.
VISIT the Maytag Collectors Club at  www.Maytagclub.com  