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Proof test acc. to AD 2000

Proof test acc. to AD 2000

(OP)
Is it right to determine pressure test value acc. to AD 2000 Merkblatt last edition (to satisfy PED requirements) for heat exchangers type of AET or AES (and the others) taking into consideration not only shell and heads but also main flanges and their  bolts as pressure parts? This situation causes that PT is limited by bolts. Please see
Ad 2000 HP30 para. 4.17 third indent. Also please see PED guidelines numbers 7/6 and 7/8 (main bearing pressure parts).
Jack

RE: Proof test acc. to AD 2000

The main point about clause 7 of Annex 1 of the PED is that it is NOT mandatory as long as you can ensure a similar level of safety.

I would, and have, always argued that the minimum hyrostatic test pressure as prescribed by the design code must be honoured as this will ensure that all factors of safety are consisitent throughout the design analysis.

Without reading HP30 I would advise that all parts, including flanges and bolts, should be analysed and the rules of HP30 be honoured completely.

RE: Proof test acc. to AD 2000

In this case, formulas for minimum hydrostatic pressure in AD are the same as stated in PED. max(1,43;1,25*k20/k.
Smaller ratio should be consider, that implies less pressure
But, AD only states as main pressure bearing parts shell and ends.
If taking flanges and bolts causes a smaller pressure test, you may be complying PED but no AD.
If you are not sure if flanges and bolts would be consider as main bearing pressure parts, simply don`t consider them.
Except with hazardous or letal substances, there would always be doubt about main pressure parts definition.

Regards from Barcelona
G. García

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