[Public-List] Standpipe exhaust and dripless bearings

[mahseer at kos.net]

Thanks Jim
This is the one I am considering.

John Boor
MAHSEER #380

> John
>
> I am assuming you are using a PSS shaft seal.  I have one on Isa Lei and
> am totally satisfied with it.  Mine is an older version without the vent,
> so I have to "burp" it from time to time.  The current production
> supposedly does not require "burping".  Below I took the liberty of
> copying from the PSS installation instructions concerning the proper
> venting.
>
> 15A. Low speed boats:(Under 12 knots of boat speed under power).
> Note:Sailboats or displacement powerboats with a powering speed below 12
> knots can use either method A or B.
> Using a 3/8 " ((8 or 9 mm)ID "underwater rated " hose ((not provided with
> the PSS), connect the hose to the hose barb fitting installed on the
> carbon and secure the hose with two (2)hose clamps.Run the hose to a point
> in the boat at least two (2)feet above the waterline,making sure that the
> hose does not apply any load on the carbon part of the seal.Keep the hose
> as close as possible to the centerline of the vessel so the top of the
> vent hose is never below the waterline,even if the boat heels.Secure the
> hose in place with the necessary fittings that insure it will not pull
> free and drop.This hose is now a venting hose that will help ensure that
> no air is trapped in the seal.
>
> WARNINGS: Do not run a loop at the top end of the vent hose as it could
> start a siphon action in some extreme conditions.Also,make sure the vent
> hose is properly secured from falling below the waterline.If the vent hose
> were to fall down below the waterline, water would come in the
> boat.Also,do not plug or block the end of the vent hose,as this would
> prevent the line from venting.
>
> http://www.shaftseal.com/about/installation_instructions
>
> Jim Davis
> S/V Isa Lei
> CT 35
>
> Freedom is never more than one generation away from extinction. We didn't
> pass it to our children in the bloodstream. It must be fought for,
> protected, and handed on for them to do the same, or one day we will spend
> our sunset years telling our children and our children's children what it
> was once like in the United States where men were free.
>
> Ronald Reagan - 40th United States President (1911 - 2004)
>
>
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