[PSUBS-MAILIST] G.L. rules Arrangement for Diving/Ballasting, Control/Compensating & Trimming

[Alan]

Hi jim,
here's a G.L. quote. "Normally compensating tanks are to be provided for a fine
adjustment of the wanted depth and for balancing of changes of buoyancy
because of consumption of provisions & supplies during the underwater voyage,
changes of the density of seawater, taking on or taking off of payloads as well 
as effects of buoyancy/loss of buoyancy."
   This section covers hard & soft tanks, internal & external, & calls them all
compensating tanks.
Alan

Sent from my iPad

> On 12/01/2014, at 9:59 am, jimtoddpsub at aol.com wrote:
> 
> Hi Alan,
> Thanks for posting that.  What all does "compensating tanks" refer to?
> Best regards,
> Jim
>  
> -----Original Message-----
> From: Alan James <alanlindsayjames at yahoo.com>
> To: psubs.org <personal_submersibles at psubs.org>
> Sent: Fri, Jan 10, 2014 5:37 pm
> Subject: [PSUBS-MAILIST] G.L. rules Arrangement for Diving/Ballasting, Control/Compensating & Trimming
> 
> Hi all,
> This is my G.L. summary of Diving/Ballasting, Control/Compensating & Trimming.
> It builds a little on a previous section "Stability & buoyancy".
>    All the ballasting controls & systems have to work under previously specified heel & trim requirements. Including when one main ballast tank is damaged.
>    It has to be possible to check these systems prior to diving.
>    The sub must be able to surface after the failure of a compensating tank.
>    Flooding & bilge openings are to be protected with grids, filters or strum boxes to stop the entrance of foreign matter.
>    All the operating units for controlling positive & negative buoyancy are to be grouped together & clearly marked on the control consul. This control consul is to have indicating instruments showing depth & trim.
>    Separate shut off valves are required for each ballast tank.
>    The vent valves are to be designed in such a way as to prevent unintentional opening.
>    Where diving tanks have flooding holes without means of closure, double shut-off
> valves "May" be stipulated for the vent pipe.
>    The blowing line for each tank has to have a separate shut off.
>    Blowing the tanks cannot cause an excessive over-pressure.
>    Where the diving tanks are pumped out there needs to be a closure valve & back up bilge pump. No excess under-pressure can be caused.
>    Compensating tanks are to be designed big enough for all the changes in
> buoyancy plus 10%
>    Compensating tanks need contents gauges to give continuous readings.
>    The compensating tank vent pipes need to be wide enough for maximum 
> inflow / outflow and designed so that water can't flow from them unnoticed in to the hull.
>    The volume of the trimming tanks is designed in such a way that all planned trimming situations can be adjusted by combined filling & emptying of the various tanks.
> Alan
> 
> 
> 
> 
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