Text 5349, 38 rader
Skriven 2005-01-28 17:19:58 av Stewart Arnett (3:772/100)
   Kommentar till text 5325 av MIKE ROSS (1:167/133.0)
Ärende: Tire inflation
======================
Hello MIKE.

23 Jan 05 21:07, you wrote to Bob Seaborn:

 MR> "Bob Seaborn" bravely wrote to "Jack Yates" (23 Jan 05  15:58:00)
 MR>  --- on the heady topic of "Tire inflation"

 >>RB> But you don't run a filling station. If you did, you'd have
 >>RB> commercial equipment and that always has an oil and water trap.
 >>
 >> The norm in this part of the world is to not have them unless it's
 >> a compressor used in painting.  Most shops just drain the water out
 >> of the tank regularly.

 BS>> Except to fill breathing air tanks, such as scuba or scott.
 BS>> Then it's water, oil, and other contaminants that are filtered.

 MR> The pump probably uses a dry lubricated nylon sleeve in the piston
 MR> cylinder too.

Dive tanks and such require multi staging air compressors, normally three
stages on an air compressor with intercooling between each stage. Thus these
units are inhearently expensive, Bruan and Reavil (Compair) both use oil free
systems, I can't remember the Braun system but the Compair Reavil used Teflon
Carbon compound piston rings in an oil free cylinder separated from the sump by
crossheads and piston rod, the piston rods passed through a ceramic seal called
a gland mounted at the top of a glandbox. These were the low pressure jobs that
only went up to about 2000 psi, these are all single acting compressors.

Even with this they still (in NZ at least) us activated charcoal filters in the
lines to remove contaminants.

This may be out of date as it is twenty years since I left Compair, though I do
know their VHP compressors are still the same as they were then.
Stewart

--- GoldED/2 3.0.1
 * Origin: The RockBBS Auckland NZ 64-9-5799600 (3:772/100)