Anyone familiar with EN 1591?

[EdClymer]

Greetings

I am designing a simple thermoplastic lined/GRP (aka FRP) reinforced, vertical, cylindrical, 30 m3 atmospheric tank to EN 13121-3 - which is a new (fifth attempt, very complicated - written by a subscript obsessive) standard - in response to the EU PED.

Tank has low level (on shell), 600 dia manway, full face flange, fully bolted, with soft gasket and cover-plate. Pressure at flange invert (from static head) is 0.56 bar.

EN 13121-3 calculation (to verify flange) requires 'effective gasket area using EN 1591'. (That is 'Flanges and their joints: design rules for gasketed circular flange connections).

It could mean - the mean diameter of gasket x Pi x gasket width; or it could mean a narrow area wholly within the bolt circle; or, something completely different.

Can anyone offer assistance?

Regards

Ed




Ed Clymer
Resinfab & Associates
England

 

[XL83NL]

I would encourage you to buy the standard. The price is fair what the standard offers. If understood and practizied well, it offers serious improvements to conventional flange & gasket design methods such as BPV VIII-1 appendix 2, and the likes. That being said, it's not an easy standard.

 

[EdClymer]

XL38NL

Many thanks for your descriptive reply.

So it was mean diameter x pi x width after all..

I have no objection to buying standards that will be in frequent use; but £228 for an answer to one question?

Do you have any experience of EN13121-3?

I am obliged to you.

Regards

Ed

Ed Clymer
Resinfab & Associates
England

 

[XL83NL]

No experience with EN 13121-3, except we buy most of our FRP/GRP vessels acc. that standard.

£228 may be much, but it could easily be little compared to an overall job investment. Not the metion the price it costs when making mistakes based on wrong assumptions (not saying you are, but hypothetically).

 

[EdClymer]

XL38NL

Thanks for your (quite correct) observation.

I am designing large GRP structures (not flanges).
I just needed clarification as to description of term 'effective gasket area'; as other codes use a narrow area inside bolting circle (as BS4994).

I decided that actual EN13121-3 calculation was complex (and with unknowns) best route was to use a standard tabulated flange.

I have now written (nearly) the verification.

I note with interest your comment on local tanks. Do you know of any internet forum(s) specific to EN13121-3? Or, anyone who may know of any? Or, anyone who may help to decipher the code (it is rather complicated)?

Again my thanks.

Regards

Ed


Ed Clymer
Resinfab & Associates
England

 

[XL83NL]

Do you know of any internet forum(s) specific to EN13121-3?

My best bet would be here @ eng-tips. Try a new topic maybe, but based on a Google search I think the code you work to is not that familar here.

Or, anyone who may help to decipher the code (it is rather complicated)?

You may want to try getting in touch with other companies who design similar items, or with engineerds working at those companies (e.g. via LinkedIn) - companies themselves will most likely not share their experiences if they cant make a profit out of it, especially not when youre their competitor.

 

[EdClymer]

XL83NL

Thanks for note.

I am not a competitor. I have worked two years on this project (after 44 years on BS4994) to write an exemplar MathCAD set of calculations for purposes of verification of EN13121-3. And, to produce a step-by-step guide to it's use. All pro-bono.
To best of available knowledge, nothing has ever been constructed to this standard, therefore knowledge of subject is in very short supply.

But thanks for your imput; another piece of the puzzle solved.

Regards

Ed

Ed Clymer
Resinfab & Associates
England