<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div>Hi jim,</div><div>here's a G.L. quote. "Normally compensating tanks are to be provided for a fine</div><div>adjustment of the wanted depth and for balancing of changes of buoyancy</div><div>because of consumption of provisions & supplies during the underwater voyage,</div><div>changes of the density of seawater, taking on or taking off of payloads as well </div><div>as effects of buoyancy/loss of buoyancy."</div><div> This section covers hard & soft tanks, internal & external, & calls them all</div><div>compensating tanks.</div><div>Alan</div><div><br>Sent from my iPad</div><div><br>On 12/01/2014, at 9:59 am, <a href="mailto:jimtoddpsub@aol.com">jimtoddpsub@aol.com</a> wrote:<br><br></div><blockquote type="cite"><div><font color="black" size="2" face="arial">
<div><font size="3">Hi Alan,</font></div>
<div><font size="3">Thanks for posting that. <font face="Arial, Helvetica, sans-serif">What</font> all does "compensating tanks" refer to? </font></div>
<div><font size="3">Best regards,</font></div>
<div><font size="3">Jim</font></div>
<div> </div>
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<div></div>
<div style="color: black; font-family: arial,helvetica; font-size: 10pt;">-----Original Message-----<br>
From: Alan James <<a href="mailto:alanlindsayjames@yahoo.com">alanlindsayjames@yahoo.com</a>><br>
To: <a href="http://psubs.org">psubs.org</a> <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br>
Sent: Fri, Jan 10, 2014 5:37 pm<br>
Subject: [PSUBS-MAILIST] G.L. rules Arrangement for Diving/Ballasting, Control/Compensating & Trimming<br>
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<div>Hi all,</div>
<div>This is my G.L. summary of Diving/Ballasting, Control/Compensating & Trimming.</div>
<div>It builds a little on a previous section "Stability & buoyancy".</div>
<div> All the ballasting controls & systems have to work under previously specified heel & trim <span style="font-size: 14pt;">requirements. Including when one main ballast tank is damaged.</span></div>
<div style="color: rgb(0, 0, 0); font-family: HelveticaNeue, "Helvetica Neue", Helvetica, Arial, "Lucida Grande", sans-serif; font-size: 14pt; font-style: normal; background-color: transparent;"><span style="font-size: 14pt;"> It has to be possible to check these systems prior to diving.</span></div>
<div style="color: rgb(0, 0, 0); font-family: HelveticaNeue, "Helvetica Neue", Helvetica, Arial, "Lucida Grande", sans-serif; font-size: 14pt; font-style: normal; background-color: transparent;"><span style="font-size: 14pt;"> The sub must be able to surface after the failure of a compensating tank.</span></div>
<div style="color: rgb(0, 0, 0); font-family: HelveticaNeue, "Helvetica Neue", Helvetica, Arial, "Lucida Grande", sans-serif; font-size: 14pt; font-style: normal; background-color: transparent;"><span style="font-size: 14pt;"> Flooding & bilge openings are to be protected with grids, filters or strum boxes to stop the entrance of foreign matter.</span></div>
<div style="color: rgb(0, 0, 0); font-family: HelveticaNeue, "Helvetica Neue", Helvetica, Arial, "Lucida Grande", sans-serif; font-size: 14pt; font-style: normal; background-color: transparent;"><span style="font-size: 14pt;"> All the operating units for controlling positive & negative buoyancy are to be
grouped </span><span style="font-size: 14pt; background-color: transparent;">together & clearly marked on the control consul. This control consul is to have indicating instruments showing depth & trim.</span></div>
<div style="color: rgb(0, 0, 0); font-family: HelveticaNeue, "Helvetica Neue", Helvetica, Arial, "Lucida Grande", sans-serif; font-size: 14pt; font-style: normal; background-color: transparent;"><span style="font-size: 14pt;"> Separate shut off valves are required for each ballast tank.</span></div>
<div style="color: rgb(0, 0, 0); font-family: HelveticaNeue, "Helvetica Neue", Helvetica, Arial, "Lucida Grande", sans-serif; font-size: 14pt; font-style: normal; background-color: transparent;"><span style="font-size: 14pt;"> The vent valves are to be designed in such a way as to prevent unintentional opening.</span></div>
<div style="color: rgb(0, 0, 0); font-family: HelveticaNeue, "Helvetica Neue", Helvetica, Arial, "Lucida Grande", sans-serif; font-size: 14pt; font-style: normal; background-color: transparent;"><span style="font-size: 14pt;"> Where diving tanks have flooding holes without means of closure, double shut-off</span></div>
<div style="color: rgb(0, 0, 0); font-family: HelveticaNeue, "Helvetica Neue", Helvetica, Arial, "Lucida Grande", sans-serif; font-size: 14pt; font-style: normal; background-color: transparent;"><span style="font-size: 14pt;">valves "May" be stipulated for the vent pipe.</span></div>
<div style="color: rgb(0, 0, 0); font-family: HelveticaNeue, "Helvetica Neue", Helvetica, Arial, "Lucida Grande", sans-serif; font-size: 14pt; font-style: normal; background-color: transparent;"><span style="font-size: 14pt;"> The blowing line for each tank has to have a separate shut off.</span></div>
<div style="color: rgb(0, 0, 0); font-family: HelveticaNeue, "Helvetica Neue", Helvetica, Arial, "Lucida Grande", sans-serif; font-size: 14pt; font-style: normal; background-color: transparent;"><span style="font-size: 14pt;"> Blowing the tanks cannot cause an excessive over-pressure.</span></div>
<div style="color: rgb(0, 0, 0); font-family: HelveticaNeue, "Helvetica Neue", Helvetica, Arial, "Lucida Grande", sans-serif; font-size: 14pt; font-style: normal; background-color: transparent;"><span style="font-size: 14pt;"> Where the diving tanks are pumped out there needs to be a closure valve & back up </span><span style="font-size: 14pt; background-color: transparent;">bilge pump. No excess under-pressure can be caused.</span></div>
<div style="color: rgb(0, 0, 0); font-family: HelveticaNeue, "Helvetica Neue", Helvetica, Arial, "Lucida Grande", sans-serif; font-size: 14pt; font-style: normal; background-color: transparent;"><span style="font-size: 14pt; background-color: transparent;"> Compensating tanks are to be designed big
enough for all the changes in</span></div>
<div style="color: rgb(0, 0, 0); font-family: HelveticaNeue, "Helvetica Neue", Helvetica, Arial, "Lucida Grande", sans-serif; font-size: 14pt; font-style: normal; background-color: transparent;"><span style="font-size: 14pt; background-color: transparent;">buoyancy plus 10%</span></div>
<div style="color: rgb(0, 0, 0); font-family: HelveticaNeue, "Helvetica Neue", Helvetica, Arial, "Lucida Grande", sans-serif; font-size: 14pt; font-style: normal; background-color: transparent;"><span style="font-size: 14pt; background-color: transparent;"> Compensating tanks need contents gauges to give continuous readings.</span></div>
<div style="color: rgb(0, 0, 0); font-family: HelveticaNeue, "Helvetica Neue", Helvetica, Arial, "Lucida Grande", sans-serif; font-size: 14pt; font-style: normal; background-color: transparent;"><span style="font-size: 14pt; background-color: transparent;"> The compensating
tank vent pipes need to be wide enough for maximum </span></div>
<div style="color: rgb(0, 0, 0); font-family: HelveticaNeue, "Helvetica Neue", Helvetica, Arial, "Lucida Grande", sans-serif; font-size: 14pt; font-style: normal; background-color: transparent;"><span style="font-size: 14pt; background-color: transparent;">inflow / outflow </span><span style="font-size: 14pt; background-color: transparent;">and designed so that water can't flow from them unnoticed in to the hull.</span></div>
<div style="color: rgb(0, 0, 0); font-family: HelveticaNeue, "Helvetica Neue", Helvetica, Arial, "Lucida Grande", sans-serif; font-size: 14pt; font-style: normal; background-color: transparent;"><span style="font-size: 14pt; background-color: transparent;"> 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.</span></div>
<div style="color: rgb(0, 0, 0); font-family: HelveticaNeue, "Helvetica Neue", Helvetica, Arial, "Lucida Grande", sans-serif; font-size: 14pt; font-style: normal; background-color: transparent;"><span style="font-size: 14pt; background-color: transparent;">Alan</span></div>
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