[PSUBS-MAILIST] Specifications when ordering shell

[James Frankland via Personal_Submersibles]

Hi Andre,

I was in this position some years ago.  Not knowing what to specify on the
order.

I believe the EN number is a certificate of the material quality.  Mine was
done to EN10204.3.1.B but i never specified it.  I just asked for the
material type.

So just ask for your dimensions of shell, material, percentage of round,
bevel, weld.


Example.

Shell.  P355 Steel.  10mm Thick.

OD 1000mm x 2000mm length.
Shell to be within +\- 3mm on diameter.
Welded seam.
35 degree external bevel with 2mm nose.


Something like that should do it.  They will send you a quote and should
tell you what material grade it what code they will be working to.


Make sure you specify clearly the tolerance of roundness you want and say
your not paying for it if its not right.  They will probably need to
re-roll the cylinder.

Ideally go to the factory with a wooden template and measure the cylinder
before you accept it.

Get the bevel put on, it will save you pain.  But. don't bother with grit
blasting, you need to paint it straight away after that or it will start to
oxidise again.  By the time you've finished your hull, it will be all rusty
again.  Grit blast when you've finished working on the hull.

Someone else may have some other suggestions.  Comments.

Hope this helps.

Kind Regards
James



On 21 March 2015 at 22:30, André Eriksen <personal_submersibles at psubs.org>
wrote:

> Hi,
>
> I`m in the process of ordering the shell and tower for my submarine.
> What specification should I ask for? (Europe)
>
>  I asked for EN10204 with 3.1 Sertificate (Not 100% sure of this, but
> this is what I got when I ordered the endcaps from another company. 3.2
> Sertificate was a bit too expensive)
> Told them I had no special requirements for the plates and needed no edge
> preperation.
>
> *They replied*: "this is not the normal enquiry type, but we will not ask
> any longer" (?)
> And said the plates was going to be EN10028-3 with certificate 3.2.
>
> I want to keep the cost down, but should I ask that they grit blast the
> shell after rolling?
> Also I didn`t ask for bevel on the edges. Again to keep cost down. But
> maybe I should, to spare me the extra work?
>
> May I ask what you tell your supplier when ordrering?
>
>
> -André
>
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