[PSUBS-MAILIST] strain relief fittings

[Alan via Personal_Submersibles]

Rick,
have attached a screen shot of the blueglobe page where it says they are rated 
up to 15 bar. That's 217 psi or round about 440ft.
As said before Emile tested them to something like 3000ft. But still he & Carsten 
doubled up on them.
I am not sure what safety margin sealcon uses. Sometimes it's 4x with plastics, &
it does have a plastic sealing insert. So maybe the cable would start extruding through 
at 1200ft. Possibly more if they factor in ageing. The reps have to cover their butt in
case you lose your life & sub using their product. I presume they sell the plastic
sealing inserts that Blueglobe advises you change every time you untighten the
fitting. You could change the inserts out every couple of years so that aging isn't
a factor.
What is the worst case scenario if one fails at 350 ft? The metal housing of the gland
isn't going to fail, just the insert; & if the cable is running through it then water is not
going to flow through the gap left by the torn insert in a great volume! 
You could calculate the water flow through the maximum hole size in the fitting
if the gland & cable weren't there, & work out how much time you would have
before the flooding was critical.
Have heard of people putting their cables through valves so they can pull the
wires out of connectors & close the valve off.
That's my thoughts anyway. 
Cheers Alan






> On 16/06/2020, at 4:20 AM, Rick Patton via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> 
> Barbara Rainone <SalesRegion2 at sealconusa.com>
> to me
> 
> This is the response I got after discussing my delima with Sealcon. I have half a grand now in useless fittings unless they will take them back but I bought them about 4 years ago. guess I should have done my research a little better!
> 
> 
> 
> Rick
> 
> 
> 
> Hello Rick,
> 
>  
> 
> I was discussing this with my team mate Randy and he agreed you will not be able to use that fitting (CD09NA-6S) any deeper than 300 feet.  We have fittings with clamps but those are just going to give you more security on the pull out.  I do not think we can help you with your application due to the depth of the water.
> 
>  
> 
>  
> 
> ---
> 
> 
> 
> Barbra Rainone
> 
> Sr. Customer Service Specialist – Region 2
> 
> Sealcon
> 
> Connect with me on LinkedIn
> 
> Phone 800-456-9012 / 303-699-1135 Ext 5029
> 
> Email  SalesRegion2 at SealconUSA.com
> 
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