On Fri, 17 Jun 2005 19:33:31 +0000 (UTC), Christopher Tidy
wrote:
Just another quick question. On the Bristol compressor I spotted on eBay
I see a pipe leading from the crankcase to the cylinder.
http://cgi.ebay.co.uk/ws/eBayISAPI.d...tem=7980508669
Anyone know what this is for? Is it for pressure lubrication or does it
mean the compressor is double-acting? Just curious.
No, that looks like a single-stage compressor. The line might be a
simple gear pump to squirt oil up under the piston skirt, or it might
be for a centrifugal unloader. When the motor gets up to speed and
the oil pressure comes up in the compressor, the oil pressure allows
the intake valve to close and then it starts pumping.
One post up in the thread, Christopher wrote:
I think unfortunately 7 hp is pushing it from our single phase supply.
At the absolute maximum we can get 230 V 45 A. I know this is about 10
kW but I suspect the motor will overload the supply when starting. My 5
kW welding set makes the lights go dim in the house.
A 240V single-phase 45A service in the UK would translate to a bit
smaller than the USA small residence service for a old house, where
you get 120/240V at 50 to 70 amps or so. Definitely NOT enough to run
any sort of home shop equipment from at the same time there are
residence-type loads being run.
Let the Missus ;-) start doing a few loads of laundry (washer,
dryer, iron), start lunch (toaster) and run the air conditioning, and
when the 5-HP motor for the air compressor kicks on out in the garage
you are going to pop the Main.
You might have to break down and do a service upgrade on your house,
or if you are renting you might have to find a new house with a more
modern service. Or talk the landlord of your existing rental house
into doing the service upgrade, and you figure out an equitable split
of the electrician's bill with him - you get the extra power to use
while you are living there, and it is an improvement that will raise
the property value.
(I'd make sure the lease has enough time to run that you get your
investment back through usage, or agree on a pro-rated buy-out of your
part of the investment if he wants to terminate a lease or a
month-to-month rental agreement before three to five years pass.)
-- Bruce --
--
Bruce L. Bergman, Woodland Hills (Los Angeles) CA - Desktop
Electrician for Westend Electric - CA726700
5737 Kanan Rd. #359, Agoura CA 91301 (818) 889-9545
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