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Carsten, Correction, US military subs previously
used Kingston valves. From personal experience have climbed into the aft
MBT of a Los Angeles-Class sub by lower the MBT grate on the bottom of
the sub underwater and climbing up a tunnel to access the towed array SONAR
cable reel that is housed within the tank. This was for a maintenance
operation while the boat was on the surface. Respectfully, Jay K. Jeffries Andros Is., Bahamas As scarce as the truth is, the supply has always been in excess of
the demand. -Josh Billings From: Jay K. Jeffries
[mailto:bottomgun@mindspring.com] Carsten, You have a
well thought out procedure (except for the coat hanger feature aboard the Kraka
J). US military subs do have Kingston valves. R/Jay Respectfully, Jay K. Jeffries Andros Is., Bahamas As scarce as the truth is, the supply has always been in excess of
the demand. -Josh Billings -----Original Message----- Hi Jay, for me riding the bubble means some air in the
soft tank - not in the hard tank. "Riding the Bubble" is possible in greater
dephts but no so easy near the surface. The high relative pressure difference per water deep near
the surface change the bubble size to quick to handle it. I did it many times on Peppers before we add the hard
tank. Its possible but not fun. We balance the boat with lead - open and flood the MBT to
dive and were not in perfect trim - just 1 - 4 kg to heavy. The rest was RtB..
Need a lot of attention. On Peppers we normaly surface just with the small hard
tank and than blow the big soft tank near the surface. To safe HP air is one
reason - but the most reason is that so sub run very fast and nearly out of
control to the surface if you blow the soft tank in the deep. Its a heart
beating adventure to run the boat on the surface with 20% positive bouancy.
Flying a solid fuel rocket must be simillar :-) Euronaut has ballvalves on top oft the soft tanks and on
top of the ballvalves is a tread which is close by a brass plug on longer
harbour resting times. During a surface transfer with Peters Kraka in Kopenhagen
one of my crew members inside the sub missunderstand one handle as jacket
holder. As result the aft ball vale was slightly open. The sub aft MBT flooded
partly, the sub with hatch open, full speed ahead and four peoples on the deck
and two under. We just realise what is happen with the aft ball vale under
water seeing the air bubbles out. In this case teh speed safe the sub. I will
not imagine what will be happen in case this will be done with the bow vale
instead. To have harbour/surface tread blind plugs on the top vales is maybe whise
for civil subs.. On Euronaut we also use this blind-plugs to check out the
mechanical drive system of the ballvale - means open and close the ballvales
for check without flooding the tanks. There are no Kingston vales at the bottom on US or
European bigger subs but I think russian and british have them. http://www.euronaut.org/content/upload/notes/Bug_3434.jpg http://www.euronaut.org/content/upload/notes/Bug_3437.jpg http://www.euronaut.org/content/upload/notes/Heck_3433.jpg vbr Carsten "Jay K. Jeffries"
<bottomgun@mindspring.com> schrieb: > As Vance has noted, mushroom valves provide a clean
hull solution for > venting the MBTs. Note that on larger subs a
cover flange is bolted over > the mushroom vent valve when on the surface for extended
periods of time > (i.e. at anchor or at the pier) to protect against
air leaks past the valve > or an inadvertent venting of the tank thus
preventing an unintended sinking > of the sub. While submerged, the vent valves
are left open to vent off any > air that might be leaking from the blow line thus
preventing unwanted > changes in buoyancy while submerged. When
submariners speak of "riding the > bubble", they are referring to the air in the
hard trim tank as the MBTs are > left completely flooded while submerged. Due to free
surface effect and the > larger size of the MBTs, rapid adverse changes to
trim can occur if an > attempt made to use the MBTs for trim control.
To conserve of HP air for > blowing the tanks, the sub is driven to the surface
and the MBTs blown while > at or near the surface. The Kingston valves at
the bottom of the MBTs may > also be closed when on the surface for extended
periods. > > R/Jay > > > > Respectfully, > > Jay K. Jeffries > > Andros Is., Bahamas > > > > As scarce as the truth is, the supply has always
been in excess of the > demand. > > -Josh Billings ************************************************************************ ************************************************************************ ************************************************************************ The personal submersibles mailing list complies with the
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