In article , jim rozen wrote:
In article tF2Ib.683809$HS4.4843991@attbi_s01, Loren Coe says...

well, it's not a dramatic increase in amps as pressure rises, not enough
to contradict Gary or Richard. my Sears 2hp (35+yrs old) starts on
an empty tank (0 pressure) at 11a and is at 12.7 amps at shutoff, 130 lbs.
that's about a 15% variation.

If you are just measuring this with an amp-clamp
meter, you may be fooled by the phase angle of
the current. At start much of that 11 amps
may be reactive power, at finish it may be mostly real.
Jim

gak! another ugly variable raised. yes, just an amp-clamp,
from RShack. maybe you do need a phd to argue in this thread(!).
in real power terms, what variation would be the most expected ?
--Loren

ps. just fyi, the start current was significantly higher at
35psi vs 0. just guessing, 20-25a vs 17-20. the branch
is on a 30a breaker. this comports w/my earlier experience
w/a similar vintage 1hp 120/240v Sears, it absolutely would
not start at 90psi when on a drop cord, but did just fine on
230v.

================================================= =
please reply to:
JRR(zero) at yktvmv (dot) vnet (dot) ibm (dot) com
================================================= =