Hi Peggy,
Thanks for the reply.

The boat is a PC or "Performance Cruiser." It is quite capable of high speed
running, but rarely do we open her up. My "first mate" perfers a slow ride
down the river. say 25 knots or so. The boat is not banged about at all.

We do have a macerator discharge pump, but rarely use the thing as most of
our travels are in no-discharge zones, and pump out stations are readily
available.

This brings up another question. Could the pump out vacuum be causing the
tank to crack. It does "flex" when the unit is pumped out.

The pump in question is a diaphram type vacuum pump. I was seking a new
diaphram and duckbill valve set.

I would appreciate any recommendations for heavier walled tanks then the
Todd units. I am getting a little thin on scrubbing sewage out of the engine
room.

Would re-piping the system with PVC pipe, eliminating the hoses, be any
advantage other then making the engine room a little neater? The hoses take
up an inordinate amount of room. The fellow who installed the vac-u-flush
system was not real slick as far as a clean installation.

I will exaimne the mount for the tank this weekend.

Thanks again,

Capt. Frank

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03-14
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"Peggie Hall" wrote in message
...
Capt Frank Hopkins wrote:

I have a Formula 26PC with a vac-u-flush. The problem(s) is, the
holding tanks crack and leak on the rear bottom seam. I am on my
third holding tank in 2 years. The tanks are standard TODD units. I
am wondering if I need a special "heavy duty" tank to handle the
"kawoosh" of the vacuum flush?

Todd tanks are pretty flimsy, but the toilet isn't the source of your
problem....'cuz the V/Flush "kawoosh" doesn't go any further than the
vacuum pump, which then pushes the waste the rest of the way to the tank
as it pulls the air of the system between the bowl and the tank. So a
V/Flush puts no more pressure on the holding tank than any other toilet.

Here's what I suspect: If your Formula is a "go fast" model, a
thin-walled tank can't take the kind of pounding that everything in your
boat takes when you run for extended periods at WOT...you're literally
beating the tank to death. So not only do I agree that you need a
thicker walled tank, but that you also need to examine how the tank is
secured and provide some shock absorption/cushioning for it.


Also, my waste pump needs an overhaul. Any suggestions for a place to
buy spare parts? Our local dealer no longer handles vacuflush systems
or parts.

Waste pump? Do you mean the vacuum pump for the toilet...or the
overboard discharge pump to dump the tank? Also explain
"overhaul"--just new duckbill valves, or more serious work?

Peggie
----------
Peggie Hall
Specializing in marine sanitation since 1987
Author "Get Rid of Boat Odors - A Guide To Marine Sanitation Systems and
Other Sources of Aggravation and Odor"
http://www.seaworthy.com/html/get_ri...oat_odors.html