Anyone familiar with EN 1591?
Anyone familiar with EN 1591?
(OP)
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





RE: Anyone familiar with EN 1591?
RE: Anyone familiar with EN 1591?
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
RE: Anyone familiar with EN 1591?
£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).
RE: Anyone familiar with EN 1591?
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
RE: Anyone familiar with EN 1591?
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.
RE: Anyone familiar with EN 1591?
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