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CAN AN ASME DESIGNED PRESSURE VESSEL BE USED IN EUROPEAN STATES (PED)

CAN AN ASME DESIGNED PRESSURE VESSEL BE USED IN EUROPEAN STATES (PED)

(OP)
http://eng-tips.com/viewthread.cfm?qid=204615&page=1

This conversation is in continuation to the above link-apologies for any discomfort.

From the discussion earlier,
We have designed a vessel as per ASME standard and cutomer wants the vessel to be also designed as per PED. MATERIALS HAVE ALREADY BEEN PURCHASED AS PER ASME

As per Annex 1, theseare the safety precautions I have taken,
1. Hydrostatic pressure as per Annex 7.4
2. Final Assessment will be carried out as per Annex 3.1 and same goes on marking and labelling.
3. Vessel falls under Module H so it has to third party inpection

MY ONLY WORRY IS CAN I USE ASME STAMP MATERIAL AND CAN STILL HAVE VESSEL CERTIIFED TO P.E.D

Any views greatly appreciated

RE: CAN AN ASME DESIGNED PRESSURE VESSEL BE USED IN EUROPEAN STATES (PED)

You have to perform a Particular Material Appraisal (PMA) for the materials used.

You should contact the Notified Body you want to use for help with this as they will have to appraise it, but it is a simple process where you consider the mechanical, environmental and joining issues of a material in relation to Essential safety requirements.

You have to do this for any material you use for the PED and there are no harmonised standards and no european approved materials yet, so using ASME is the same as using materials from any other code.

Module H requires that you have your quality system approved and is a continuous system, similar to having a U-Stamp. For a one-off module B1 + F for design appraisal and inspection is better.

We have just completed a vessel that has both a U Stamp and certified to PED, the main issue is that ASME  dictates stamping in one format while the PED dictates another and so we have added two nameplates.

You must stamp PED vessels correctly, e.g. design pressures must be labelled PS, design temparture PT, etc.

Your issues as I see them know are:

1. If you going to produce lots of PED vessels then module H is OK if not consider another module.

2. Find a notified body and develop the PMAs.

RE: CAN AN ASME DESIGNED PRESSURE VESSEL BE USED IN EUROPEAN STATES (PED)

As a pointer, shop around for notified bodies, there was one notified body that was telling manufacturers that they had to have material from a manufacturer approved by a notified body, this is rubbish, material should come from a supplier with a quality system approved by a body who has a presence in the EU (see the PED for a more precise definition).

I'm not going to name the NB (they know who they are...;P).

We use Lloyd's but I'm sure others can help.

I would advise choosing an NB who has exposure in as many member states of the EU as possible, there is some agreement on how the PED is implemented but there have been issues with Germany (although I think these are now resolved) and I'm sure others have a slant of interpretation that protect their own manufacturers.

RE: CAN AN ASME DESIGNED PRESSURE VESSEL BE USED IN EUROPEAN STATES (PED)

David97,
Fawkes makes some very good points. Although every Notified Body reads the same PED, they sometimes enforce or accept differently, for material approval, welding, etc. I have worked with TUV Rheinland and HSB Global Standards and both have their strengths and weaknesses.

If you have already purchased materials by ASME standards you may have problems or have to do extra testing to get acceptance. Choose your NoBo carefully and ask how they handle welding, material approval, travel costs of auditors, etc.

RE: CAN AN ASME DESIGNED PRESSURE VESSEL BE USED IN EUROPEAN STATES (PED)

(OP)
Thanks Fawkes and PVinpector on your time and views.

Apologies- went out for holidays and christams is coming soon..:)

I fully agree with your points as nameplate will be done as per PED becuase the vessel is going in Europe.
Materials, I can't comment as I will be waiting on NB comments, luckily our NB is Lylods as well.

But as Fawkes said that the vessel certifying both PED and ASME are acceptable in certain situation, Material selection might all depends on the design condition the vessel might be used.

What if the design conditon are not too extreme. I mean if the deign temp is between -1 to 120 (degree) celcius and
design pressure is just 10 bar.
Seismic and other design factor are normal as well, than I beleive ASME material should be accpeted for PED vessels.

RE: CAN AN ASME DESIGNED PRESSURE VESSEL BE USED IN EUROPEAN STATES (PED)

David97,

In your PMA you have to document your material has appropriate properties, is sufficiently tough and ductile, not affected by ageing and suitable for the intended processing.
Most of these requirements are covered by the material specifiation.

Regards,
swig

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