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Back off the IP and you do not need sealed for cold. Stan Dilcher wrote: > > Thanks for the description David. Most who don't dive cold have recommended > the non-sealed. Why is this the case given the internals are so similar? > More compact? Fewer parts? Less failure prone? My diving will be mostly > saltwater, non-cold. At what water temp does freezing become a concern? > > Thanks again, > Stan Dilcher > > >From: "Shimell, David (shimell)" <shimell@se*.co*> > >To: Stan Dilcher <divewrecks@ho*.co*>, techdiver@aquanaut.com > >Subject: RE: Thanks for Apeks Info! > >Date: Tue, 30 May 2000 05:08:44 -0700 > > > >Stan > > > > >Can someone please comment on the advantages/disadvantages of sealed vs. > > >non-sealed first stages (as in the Apeks models)? I'm not sure I > >understand > > >the difference or if one has a higher potential for failure in certain > > >conditions. I don't plan on cold water diving at this point. > > > >The sealed version differs only in that it has a slightly longer first > >stage > >and what looks like a silicone environmental seal. In the event of the > >seal > >being damaged, water will ingress and you now have an unsealed first stage > >just like a US4. Thus, an environmental seal failure will not be a > >problem. > > > >To explain further. Inside the sealed compartment are the same innards as > >a > >US4 - A SS spring, screw thrust adjuster, pressure cap and diaphragm. It > >is > >the diaphragm that seals the remaining functional parts of the first stage > >innards from water. So if you lose the environmental seal the diaphragm > >provides a (second) water seal just like a US4. > > > >The environmental seal simply prevents water getting inside where the lack > >of > >water motion and well conducted cooling due to pressure drop could result > >in > >ice formation. I dive all year round in the UK with no problems when using > >sensible precautions. I have no experience in sub 4 deg C conditions so > >don't > >read anything into the suitability for this sort of diving. > > > >David Shimell > >shimell@se*.co* <mailto:shimell@se*.co*> > >DDI: 01932 814096 * Mobile: 07770 282 202 * Fax: 01932 814343 > >Project Manager, IBM UK Web Server Group, Sequent Computer Systems Ltd, > >Weybridge Business Park, Addlestone Road, Weybridge, Surrey, KT15 2UF, UK > >registered in England and Wales under company number: 1999363, registered > >office as above > > > >-----Original Message----- > >From: Stan Dilcher [SMTP:divewrecks@ho*.co*] > >Sent: Sunday, May 28, 2000 8:16 PM > >To: techdiver@aquanaut.com > >Subject: Thanks for Apeks Info! > > > >Thanks to the many people who have provided information in response to the > >Apeks regulator questions I posed. It looks like recommendations point to > >the the US4/TX40 combo. This will be for my first doubles rig that I am > >doing some advanced planning for. At present I am planning on a Scuba Pro > >R380 for a backup. My main diving interest is ocean/wreck diving. > > > >Can someone please comment on the advantages/disadvantages of sealed vs. > >non-sealed first stages (as in the Apeks models)? I'm not sure I understand > >the difference or if one has a higher potential for failure in certain > >conditions. I don't plan on cold water diving at this point. > > > >If anyone can provide any US dealer info with regards to a US4 DIN/TX40 > >combo I would appreciate it. > > > >Thanks again to everyone who responded, > >Stan Dilcher > > > > > >________________________________________________________________________ > >Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com > > > >-- > >Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. > >Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'. > >-- > >Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. > >Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'. > > ________________________________________________________________________ > Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com > > -- > Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. > Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'. -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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