I used to have a WW II aircraft altimeter (out of an Aircobra) installed
in a Diesel LandRover when I first started pump work years ago. The
instrument took all the guesswork out of sizing pumps, and let me know
when the naturally aspirated Diesel was going to be making more smoke
than horsepower. An altimeter needs to be set every time you head out,
but they are accurate to within a few feet. Over the years, I have used
GPS, shot in elevations with transit and rod, used fine elevation topos
and guessed. :-) I agree that the only really accurate method, if
available, is to use a pressure gauge on existing plumbing, but an
altimeter is a close second and a GPS third.
Matt T
Jason Lombard wrote:
William,
Topographic maps are great if your familiar with them. A laser if you
can afford it or the best I have heard of is fill a tube or pipe with
water from the pump to your tank and measure the psi at the base of
it. The calculation is 2.31 feet of lift for every psi. Not everyone
has their piping rolled out or on site yet so this could be a
challenge and again is very accurate.
BTW - GPS units are inaccurate to the extent that they are 40 feet off
horizontally and 90 feet vertically. This means you could be up to 130
feet off. Big difference when your sizing for particular pump out put.
Good luck,
On Tue, Jan 27, 2009 at 2:34 PM, William Miller <wrmil...@charter.net
<mailto:wrmil...@charter.net>> wrote:
Does anyone have a foolproof tool to measure elevation? I have
researched GPS units recently. They are notoriously inaccurate
for elevation:
http://wiki.motionbased.com/mb/GPS_Unit_Elevation
Here are few more links with GPS fundamentals:
http://www.adventurenetwork.com/cgi-bin/adventurenetwork/GPS_101.html
http://www.gpsreview.net/electronic-compass/
I have a Suunto Observer watch with an altimeter. I think I can
get relatively accurate measurements of DIFFERENCE in elevation if
I measure the two elevations in quick succession. I will be
trying it.
William
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