[Date Prev][Date Next]
[Chronological]
[Thread]
[Top]
Re: [PSUBS-MAILIST] Information Needed for HDPE
Alex
You could have a look at www.silent-submersion.com they use a heavy wall
HDPE pipe for DPV bodies
David
----- Original Message -----
From: "Alex Varouxis" <alex@associateddesign.com>
To: <personal_submersibles@psubs.org>
Sent: Tuesday, June 10, 2003 6:19 AM
Subject: RE: [PSUBS-MAILIST] Information Needed for HDPE
> Steve
> The wall thickness of the pipe comes to .63.
>
> There are several applications that I'm looking at. The 1st is a battery
> housing that will be on the outside of a two man submersible. I'm also
> looking at a diver propulsion vehicle.
>
> Alex
>
> -----Original Message-----
> From: owner-personal_submersibles@psubs.org
> [mailto:owner-personal_submersibles@psubs.org]On Behalf Of Steven Mills
> Sent: Monday, June 09, 2003 3:21 PM
> To: personal_submersibles@psubs.org
> Subject: Re: [PSUBS-MAILIST] Information Needed for HDPE
>
> >From: Alex Varouxis <alex@associateddesign.com>
> >
> > When I plug the numbers in to Row 24 column B (Cylinder Yielding [T/OD]
> > reads "NUM!" This happens when I put in the Yield stress of 0.10E6
> >
>
> Alex, I think the numbers are out of range for the scope of the cell.
> The spreadsheet needs to be tweaked a bit. I'm going to work on it.
> If you're familiar with Excel try working with the cell range. If you do,
I
> would
> setup a dummy sheet to rework it and keep the original intact.
>
> Which brings up a question.
>
> You have the pipe at 10.75 inches OD and I.D. of 9.49 inches which
> brings the thickness at 1.26 inches. Is this a stock pipe? Or 2 pipes,
> one fitted inside the other?
>
> Is this a containment vessel that will sit outside a hull? [ like a
thruster
> cowling, duct, sensor or camera case ? ]
>
> >
> > Thanks for all your help on this
> >
>
> No problem. This is helping me, too. I figured it was time for me to
> start thinking pSub and getting things on paper instead of just talking
> and wishing. I need to get my brain and hands working!
>
> Thanks, --Steve
>
>
> > -----Original Message-----
> > From: owner-personal_submersibles@psubs.org
> > [mailto:owner-personal_submersibles@psubs.org]On Behalf Of Steven Mills
> > Sent: Sunday, June 08, 2003 1:50 PM
> > To: personal_submersibles@psubs.org
> > Subject: Re: [PSUBS-MAILIST] Information Needed for HDPE
> >
> > >From: Alex Varouxis <alex@associateddesign.com>
> > >
> > > Below are the Mechanical properties of the pipe. I'm unclear what I
> should
> > > input into in your xls file. I have located the Posions Ratio which is
> .4.
> > >
> > > Alex
> >
> > First, don't take these values as gospel. I have a range for HDPE of
> > .40 to .46 Each manufacturer has a ratio determined by their own
> > labs and tests. So, consider these values as approximations. And
> > don't *completely trust* programs like this XLS calculator.
> >
> > However, my tables for Polyethylene HDPE is .40
> > Young's Modulus is 0.29E6 and the Shear Modulus is
> > 0.10E6 ( 0.71 GPa )
> >
> > *[ anyone...jump in and please correct this if you have
> > different values ! ]*
> >
> > For the "xls" calculator these are the values to input in
> > Row 24 ( the blue highlights ).
> >
> > However, I'm still looking for that other program which might be
> > better suited to your project.
> >
> > --Steve
> >
> >
> > > Mechanical Properties
> > >
> > >
> > > Hardness, Shore D 63 - 68 63 - 68 Average = 65.6; Grade Count =
> 12
> > > Tensile Strength, Ultimate 31 - 34 MPa 4500 - 4930 psi
Average
> =
> > > 32.5 MPa; Grade Count = 12
> > > Tensile Strength, Yield 19 - 23 MPa 2760 - 3340 psi Average =
21.6
> > MPa;
> > > Grade Count = 12
> > > Elongation at Break 400 - 800 % 400 - 800 % Average =
770%;
> > > Grade Count = 12
> > > Flexural Modulus 0.79 - 0.9 GPa 115 - 131 ksi Average =
0.85
> > GPa;
> > > Grade Count = 12
> > > Izod Impact, Notched 3.2 - 5.3 J/cm 5.99 - 9.93 ft-lb/in
Average
> =
> > > 3.9 J/cm; Grade Count =
> > >
> > >
> > > -----Original Message-----
> > > From: owner-personal_submersibles@psubs.org
> > > [mailto:owner-personal_submersibles@psubs.org]On Behalf Of Steven
Mills
> > > Sent: Saturday, June 07, 2003 10:46 PM
> > > To: personal_submersibles@psubs.org
> > > Subject: Re: [PSUBS-MAILIST] Information Needed for HDPE
> > >
> > > >From: Alex Varouxis <alex@associateddesign.com>
> > > >
> > > > > Thanks for the calculator it will be useful for future use.
> > > > > Unfortunately the web site
> > http://www.matweb.com/search/SearchSubcat.asp
> > > > > that you and Rodger directed me to does not contain the required
> data
> > > for
> > > > > Pipe Grade HDPE.
> > > > > Any suggestions?
> > > > >
> > > > > Alex
> > >
> > > First, I'm still looking for my data / tables. But !...go back to
> > "matweb"
> > >
> > > http://www.matweb.com/search/SearchSubcat.asp
> > >
> > >
> > > under the search for "Thermoplastic Polymers" go down to the
> > > "polyethylene" . HDPE is listed in this category. However, be
> > > ready for a long list ! Look on your HDPE pipe for any coding.
> > > This may give you a clue as to the type.
> > >
> > > --Steve
> > >
> >
> >
>