Thanks! We have also a flat weld
in ring and a conical machined dome seat for construction and emg. escape
reason Fact is that sealing is
not easy with a much sliding. Can you post (offlist) a
sketch of the Perry sealing?? Regards, Emile Van:
owner-personal_submersibles@psubs.org
[mailto:owner-personal_submersibles@psubs.org] Namens Hugh Fulton Hi Emile, With temperature and
pressure there is definitely sliding required on the surface. One
reported distance of sliding was over 10mm but that was over 750 meters
deep. This is why rubber / neoprene is not used. I tried to see how
much mine moved but it was not easily obvious. You should calculate
the thermal expansion from 0 to 38 degrees (design limits may vary) for the
diameter you are using and then if it is a 90 degree by 1.414 for the amount
sliding by temperature. If you have the FEA then you can see what
pressure will reduce the diameter by and can estimate the minimum seat diameter
for the cone. I have a separate cone seat which is then bolted to the
steel hull so later when machining the hull seat it can be just face and bore
rather than angle seat which is much harder for portable boring / facing
machines. The seat is also greased with vacuum grease. Any comments
Vance?? I used a similar
seat arrangement to the Perry subs but mine is 90degree whereas Perry is 113
degrees I believe. Hope that helps. Regards, Hugh From:
owner-personal_submersibles@psubs.org
[mailto:owner-personal_submersibles@psubs.org] On Behalf Of Emile van Essen Hi, For the new bigger bowdome of eurosub we use a
conical seat In my opinion is it a good idea to have a flat rubber
gasket between the acrylic and the metal .This for sealing and avoid stresses
in case of an imperfect surface . In the “handbook of acrylics” this is
never mentioned. Why is this not done; too high surface pressure, sliding?? Hope you can help. Regards, Emile
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