Hi George.
My father was a submariner for the U.S. navy
and after Japan surrendered he and the captain went aboard a captured
Japanese sub
and removed some items before they sunk it for
target practice. One of the items my father got is a japanese depth gauge
off the sub.
We still have it today and it appears to be
relatively simple in that it appears to screw to a pipe of some kind and
works off outside water
pressure. It is big as gauges go, about 8
inches in diameter. I don't know if you are using an ambient sub with a
variable internal atmosphere
or a 1 atm sub that the pressure never changes
internally in. This might make a difference in the gauge's reading depending
on what kind of
gauge you used and whether it was a gauge that
operated from pressure all around the gauge or just pressure going INSIDE
the gauge.
Why not just use a simple depth gauge like the
jap one that worked screwed to a pipe penetrating the hull interior that
allowed the water pressure to come
into the pipe and go inside the gauge to
actuate it? You could put a cutoff valve on the pipe before the gauge so if
the gauge ever failed or came
apart or leaked, you could shut off the water
pressure going to the gauge. I don't understand why you would want to have a
gauge outside the hull
when you could mount it inside the hull. Seems
simple to me. Buy a depth gauge that works from pressure applied to the
interior of the gauge instead
of a gauge that works from pressure all around
the outside of the gauge. Then mount that gauge inside the hull to a pipe
that penetrates the hull that allows
the water pressure to enter the gauge and
install a shutoff valve before the gauge on the pipe. Should this be more
complicated? Am I missing something guys?
Bill Akins.
-----
Original Message -----
Sent:
Thursday, February 23, 2006 9:47 AM
Subject:
[PSUBS-MAILIST] Preasure Gauge
I'm looking to make myself some sort of
preasure gauge so I can calculate depth, but the best Idea I can come up
with is to embed a Preasure sensor in a ball of silicon and mount it to
the outside of my preasure hull, I'm thinking that the silicon will
transfer preasure to the sensor evenly as well as protect it from water
damage. The biggest problem with that would be the wires coming out of the
silicon ball causing rippage if any stress was put on them, thus allowing
water in however minute amount to get to the sensor, so I'd have to make
some sort of cradle for it so it can't move... maybe epoxy it onto a
machine brass craddle that can be mounted to the preasure hull which I can
then run the wires through so I can connect the Preasure sensor to the MC
this way I can avoid loose wires. Another problem is would the silicon
transfer the preasure so I could get an accurate reading.
Am I over thinking this, is there some simple
solution I'm over looking?
Thanks
George H. Slaterpryce III