Well, as another thread has reflected, I finally finished my PVC
outflow installation on the forward head.

This is a Raritan PHII, recently rebuilt and, just before installation,
regreased with teflon grease, so I have excellent confidence in the
pump.

It also has a recently serviced air intake valve, which I tested in the
course of the test below. It performs properly.

Because I haven't yet obtained (later today) the intake hoses, I just
filled the bowl from the shower hose. Moving the selector to "dry" I
pumped it out.

Everything went just fine. Until, after I quit more than a dozen
strokes after the noise indicated the last of the water had been
removed from the pipe under the stool (the flapper opening on intake,
then closing on pump), I heard the water cascade back down into the
area of the joker.

Based on several threads, both recent and long ago, I had *thought*
(after an annoyingly high number of confirmation questions in a
long-ago thread, because my [limited] physics understanding refused to
believe it) that you could dry pump all the liquid out of the standing
part of the vented loop. That thrilled my engineer-ish nature because I
could leave everything except the waterline level of seawater dry each
time, if I just took the time to dry pump each flush. Despite my
having, now, PVC, which should never smell, I like the thought that my
lines would remain dry and un-encumbered by scale. Back to the dry-out
process...

Evidently I'm doing something wrong, because it doesn't. Trying it
"wet" (not wet because I don't have the lines, and I'm not in the water
if I had) didn't make any difference. Pumping wildlly (perhaps 2-300
strokes per minute rate) didn't change matters.

I still assume I'll be able to push everything out of the pipe below,
as, once the fall has occurred, and the anti-syphon has let in the air
to take up the space, the next stroke should pressurize it, leading to
the air bubble going all the way to the through hull. Our marker for
success will be to have the t/h bubble (I'm sure there is a quantified
number of strokes that this will take, and we'll have to wait until
we're in the water to determine that number), and will become our
standard for final flushes.

However, I can't get rid of the standing water. What am I doing wrong
(or, is there an equipment problem?) such that I can't pump the
standing water out?


L8R

Skip

Morgan 461 #2
SV Flying Pig KI4MPC
http://tinyurl.com/p7rb4 - NOTE:new URL! The vessel as Tehamana, as we
bought her

"Believe me, my young friend, there is *nothing*-absolutely
nothing-half so much worth doing as simply messing,
messing-about-in-boats; messing about in boats-or *with* boats.
In or out of 'em, it doesn't matter. Nothing seems really to matter,
that's the charm of it.
Whether you get away, or whether you don't; whether you arrive at your
destination or whether you reach somewhere else, or whether you never
get anywhere at all, you're always busy, and you never do anything in
particular; and when you've done it there's always something else to
do, and you can do it if you like, but you'd much better not."