I put a PYI Packless Shaft Seal on Corsair in 2001. It was a ventless
model and it was important to burp it in the spring during launch. It
was still pristine when Corsair was scrapped last year. There is
nothing wrong with the traditional stuffing box but those who are
concerned of the bellows failing need to consider that their stuffing
box uses a very similar piece of hose that can fail as well.
We used similar shaft seals in the Aerospace Hydraulic Pumps that I
designed for a lot of years (after I no longer designed things that went
boom). We used bronze nose pieces in lieu of the carbon and tungsten
carbide but designed for 30,000 hours. Our designs were from 8,000 rpm
for electric motor pumps to 12,000 rpm for hydraulic motor driven
generators. Our low speed diesels really don't need the vent line.
Grace came with a standard stuffing box that was repacked in 2016. One
of my projects this spring will be to replace with a PYI packless shaft
seal (with vent, I'm getting too old to stuff myself in lockers to burp
seals!).
Both designs rely on a rubber hose to keep the majority of the water on
the outside of the boat. I'll go with the lower maintenance design.
Just one engineer's opinion.
Neil Schiller
Old: 1970 Redwing 35 (C&C 35-1), #007, "Corsair"
New: 1983 C&C 35-3, #028, "Grace"
White Lake Michigan
WLYC
On 2/17/2018 1:45 PM, Josh Muckley via CnC-List wrote:
I forgot but someone else has mentioned in the past that the vent
isn't even really necessary. Just burp the seal after each relaunch.
You can eliminate the vent by plugging the hole with a small brass
pipe plug.
Josh
On Feb 16, 2018 9:06 PM, "Brien Sadler via CnC-List"
<cnc-list@cnc-list.com <mailto:cnc-list@cnc-list.com>> wrote:
Has anyone changed to a PSS dripless stuffing box? I’m sold on the
switch I just haven’t figured out how I’m going to run the vent
line yet. Any suggestions would be great. Preliminary plan is to
run it to a very small through hull at the top of the transom.
Thanks,
Brien
Sent from my iPad
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