<html><head></head><body><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px"><div id="yui_3_16_0_1_1453502939423_3179"><span>Brian,</span></div><div id="yui_3_16_0_1_1453502939423_3179"><span>just looked up the G.L. rules Section 9 piping systems, pumps & compressors.</span></div><div id="yui_3_16_0_1_1453502939423_3179"><span id="yui_3_16_0_1_1453502939423_3471">It says 1.2 Pipes which are led thriught the pressure hull are to be fitted with 2 shut off valves.</span></div><div id="yui_3_16_0_1_1453502939423_3179"><span>One of which is to be fitted immediately at the hull wall.</span></div><div id="yui_3_16_0_1_1453502939423_3179"><span id="yui_3_16_0_1_1453502939423_3441"> In 3.3 it says " The compressed air supply is to be carried in at least 2 separate banks of receivers with the</span></div><div id="yui_3_16_0_1_1453502939423_3179"><span>same total volume."</span></div><div id="yui_3_16_0_1_1453502939423_3179"><span>Alan</span></div><br> <div class="qtdSeparateBR" id="yui_3_16_0_1_1453502939423_3184"><br><br></div><div class="yahoo_quoted" id="yui_3_16_0_1_1453502939423_3190" style="display: block;"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;" id="yui_3_16_0_1_1453502939423_3189"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;" id="yui_3_16_0_1_1453502939423_3188"> <div dir="ltr" id="yui_3_16_0_1_1453502939423_3187"> <font size="2" face="Arial" id="yui_3_16_0_1_1453502939423_3186"> <hr size="1" id="yui_3_16_0_1_1453502939423_3185"> <b><span style="font-weight:bold;">From:</span></b> Alan James via Personal_Submersibles <personal_submersibles@psubs.org><br> <b><span style="font-weight: bold;">To:</span></b> Personal Submersibles General Discussion <personal_submersibles@psubs.org> <br> <b><span style="font-weight: bold;">Sent:</span></b> Saturday, January 23, 2016 11:31 AM<br> <b><span style="font-weight: bold;">Subject:</span></b> Re: [PSUBS-MAILIST] Hp valves<br> </font> </div> <div class="y_msg_container" id="yui_3_16_0_1_1453502939423_3472"><br><div id="yiv1920852551"><div id="yui_3_16_0_1_1453502939423_3474"><div style="color:#000;background-color:#fff;font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px;" id="yui_3_16_0_1_1453502939423_3473"><div id="yiv1920852551yui_3_16_0_1_1453501134000_2740"><span id="yiv1920852551yui_3_16_0_1_1453501134000_2958">Brian,</span></div><div dir="ltr" id="yiv1920852551yui_3_16_0_1_1453501134000_2740"><span id="yiv1920852551yui_3_16_0_1_1453501134000_2770">can you split the HP air in to two lines so you have two HP lines coming in.</span></div><div dir="ltr" id="yiv1920852551yui_3_16_0_1_1453501134000_2740"><span id="yiv1920852551yui_3_16_0_1_1453501134000_2932">That way if one line failed you would have a back up. Also if a HP line ruptured</span></div><div dir="ltr" id="yiv1920852551yui_3_16_0_1_1453501134000_2740"><span id="yiv1920852551yui_3_16_0_1_1453501134000_2933">or connection broke, then you would only have half the pressure in the hull.</span></div><div dir="ltr" id="yiv1920852551yui_3_16_0_1_1453501134000_2740"><span id="yiv1920852551yui_3_16_0_1_1453501134000_2955">Inside my ambient I never see HP air, but I have two separate air systems</span></div><div dir="ltr" id="yiv1920852551yui_3_16_0_1_1453501134000_2740"><span id="yiv1920852551yui_3_16_0_1_1453501134000_3013">& valves to use both simultaneously or separately.</span></div><div dir="ltr" id="yiv1920852551yui_3_16_0_1_1453501134000_2740"><span id="yiv1920852551yui_3_16_0_1_1453501134000_3097">I am not sure what other psubbers do. This is bound to be covered in the Busby book.</span></div><div dir="ltr" id="yiv1920852551yui_3_16_0_1_1453501134000_2740"><span id="yiv1920852551yui_3_16_0_1_1453501134000_3104"> I have heard reference to subs being stuck in the mud through sitting on the bottom</span></div><div dir="ltr" id="yiv1920852551yui_3_16_0_1_1453501134000_2740"><span id="yiv1920852551yui_3_16_0_1_1453501134000_3187">& coming up carrying a load of extra weight in the form of mud. I noticed in Carsten's</span></div><div dir="ltr" id="yiv1920852551yui_3_16_0_1_1453501134000_2740"><span id="yiv1920852551yui_3_16_0_1_1453501134000_3186">video that he sat on the bottom & pivoted. I am guessing to let the divers out, but</span></div><div dir="ltr" id="yiv1920852551yui_3_16_0_1_1453501134000_2740"><span id="yiv1920852551yui_3_16_0_1_1453501134000_3251">sounds like a good practice on a muddy sea bed.</span></div><div dir="ltr" id="yiv1920852551yui_3_16_0_1_1453501134000_2740"><span>Alan</span></div><br clear="none"> <div class="yiv1920852551qtdSeparateBR" id="yiv1920852551yui_3_16_0_1_1453501134000_2934"><br clear="none"><br clear="none"></div><div class="yiv1920852551yahoo_quoted" id="yiv1920852551yui_3_16_0_1_1453501134000_3017" style="display:block;"> <div id="yiv1920852551yui_3_16_0_1_1453501134000_3016" style="font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px;"> <div id="yiv1920852551yui_3_16_0_1_1453501134000_3015" style="font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px;"> <div class="yiv1920852551yqt5039344678" id="yiv1920852551yqt62216"><div dir="ltr" id="yiv1920852551yui_3_16_0_1_1453501134000_3014"> <font id="yiv1920852551yui_3_16_0_1_1453501134000_3044" size="2" face="Arial"> </font><hr id="yiv1920852551yui_3_16_0_1_1453501134000_3208" size="1"> <b id="yui_3_16_0_1_1453502939423_3478"><span style="font-weight:bold;" id="yui_3_16_0_1_1453502939423_3477">From:</span></b> Brian Cox via Personal_Submersibles <personal_submersibles@psubs.org><br clear="none"> <b id="yui_3_16_0_1_1453502939423_3480"><span style="font-weight:bold;" id="yui_3_16_0_1_1453502939423_3479">To:</span></b> Personal Submersibles General Discussion <personal_submersibles@psubs.org> <br clear="none"> <b><span style="font-weight:bold;">Sent:</span></b> Saturday, January 23, 2016 10:23 AM<br clear="none"> <b id="yui_3_16_0_1_1453502939423_3476"><span style="font-weight:bold;" id="yui_3_16_0_1_1453502939423_3475">Subject:</span></b> Re: [PSUBS-MAILIST] Hp valves<br clear="none"> </div> <div class="yiv1920852551y_msg_container" id="yiv1920852551yui_3_16_0_1_1453501134000_3021"><br clear="none"><div id="yiv1920852551"><div id="yiv1920852551yui_3_16_0_1_1453501134000_3020"><div id="yiv1920852551yui_3_16_0_1_1453501134000_3019" style="font-family:Arial, sans-serif;font-size:10pt;"><div id="yiv1920852551yui_3_16_0_1_1453501134000_3018">Alan, The air would most likely vent thru the hatch and then I'd be at whatever pressure the ambient water pressure would be . If there was no air to surface I guess I'd have to bail. I will have an additional tank outside the hull for filling the ballast however. That will be for raising and lowering the sub with scuba while out side the sub. I was thinking it would be kind of neat to set it on the bottom in about 30' water. That way I wouldn't have to anchor it !</div><div id="yiv1920852551yui_3_16_0_1_1453501134000_3022"> </div><div id="yiv1920852551yui_3_16_0_1_1453501134000_3043">Brian<br clear="none"><br clear="none">--- personal_submersibles@psubs.org wrote:<br clear="none"><br clear="none">From: Alan James via Personal_Submersibles <personal_submersibles@psubs.org><br clear="none">To: Personal Submersibles General Discussion <personal_submersibles@psubs.org><br clear="none">Subject: Re: [PSUBS-MAILIST] Hp valves<br clear="none">Date: Fri, 22 Jan 2016 17:51:26 +0000 (UTC)<br clear="none"><br clear="none"></div><div class="yiv1920852551yqt6182735065" id="yiv1920852551yqt64167"><div id="yiv1920852551yui_3_16_0_1_1453501134000_3286" style="color:rgb(0, 0, 0);font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px;background-color:rgb(255, 255, 255);"><div id="yiv1920852551yui_3_16_0_1_1453501134000_3285"><span>Hi Brian,</span></div><div id="yiv1920852551yui_3_16_0_1_1453501134000_3288"><span id="yiv1920852551yui_3_16_0_1_1453501134000_3287">I questioned G.L. on a number of items in thier rules for submarines</span></div><div dir="ltr" id="yiv1920852551yui_3_16_0_1_1453501134000_3290"><span id="yiv1920852551yui_3_16_0_1_1453501134000_3289">& there are some grey areas that you would have to argue the point over</span></div><div dir="ltr" id="yiv1920852551yui_3_16_0_1_1453501134000_3291"><span>with an inspector.</span></div><div dir="ltr" id="yiv1920852551yui_3_16_0_1_1453501134000_3293"><span id="yiv1920852551yui_3_16_0_1_1453501134000_3292">One general rule is that no one failure can cause a major event.</span></div><div dir="ltr" id="yiv1920852551yui_3_16_0_1_1453501134000_3295"><span id="yiv1920852551yui_3_16_0_1_1453501134000_3294">If the pipe failed at that elbow & you couldn't stop the flow of HP air,</span></div><div dir="ltr" id="yiv1920852551yui_3_16_0_1_1453501134000_3297"><span id="yiv1920852551yui_3_16_0_1_1453501134000_3296">what sort of pressure could you be left with in the hull?</span></div><div dir="ltr" id="yiv1920852551yui_3_16_0_1_1453501134000_3299"><span id="yiv1920852551yui_3_16_0_1_1453501134000_3298">Would you be able to blow the ballast tanks if you lost your air</span></div><div dir="ltr" id="yiv1920852551yui_3_16_0_1_1453501134000_3301"><span id="yiv1920852551yui_3_16_0_1_1453501134000_3300">from that failure or do you have a redundant air supply?</span></div><div dir="ltr" id="yiv1920852551yui_3_16_0_1_1453501134000_3303"><span id="yiv1920852551yui_3_16_0_1_1453501134000_3302">Cheers Alan</span></div><div dir="ltr" id="yiv1920852551yui_3_16_0_1_1453501134000_3304"><span><br clear="none"></span></div><div dir="ltr"><span><br clear="none"></span></div><br clear="none"> <div><br clear="none"><br clear="none"></div><div style="display:block;"> <div style="font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px;"> <div style="font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px;"> <div dir="ltr"> <font face="Arial" size="2"> </font><hr size="1"> <b><span style="font-weight:bold;">From:</span></b> Brian Cox via Personal_Submersibles <personal_submersibles@psubs.org><br clear="none"> <b><span style="font-weight:bold;">To:</span></b> Personal Submersibles General Discussion <personal_submersibles@psubs.org> <br clear="none"> <b><span style="font-weight:bold;">Sent:</span></b> Saturday, January 23, 2016 6:34 AM<br clear="none"> <b><span style="font-weight:bold;">Subject:</span></b> Re: [PSUBS-MAILIST] Hp valves<br clear="none"> </div> <div><br clear="none"><div><div><div style="font-family:Arial, sans-serif;font-size:10pt;"><div>ABS says " as close as possible" I guess I'm ok with a short nipple coming off a elbow.</div><div> </div><div>Brian<br clear="none"><br clear="none">--- personal_submersibles@psubs.org wrote:<br clear="none"><br clear="none">From: Brian Cox via Personal_Submersibles <personal_submersibles@psubs.org><br clear="none">To: "PSubs " <personal_submersibles@psubs.org><br clear="none">Subject: [PSUBS-MAILIST] Hp valves<br clear="none">Date: Wed, 20 Jan 2016 08:34:43 -0800<br clear="none"><br clear="none"></div><div><div style="font-family:Arial, sans-serif;font-size:10pt;"><div>Is there any distinction as to how close a HP shut off valve or check valve has to be to the hull penetration so as to meet ABS requirements? Can there be a short nipple between an elbow and the valve for instance?</div><div> </div><div>Brian Cox</div></div></div>
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