PED certified vessel head

[Wecos]

I am trying to locate a 2:1 elliptical head for a pressure vessel that needs to be PED certified. I'm having trouble tracking down a manufacturer that has PED capebilities or even knows what PED is. The other issue with this piece is that it needs to be about 7/8" thick (16" OD) which is pretty demanding of many head formeres before I even get to ask about PED.

One company said they are able to form the heads but didn't seem to understand what I meant by PED. Does EN104 mean anything related to this certification?

If anyone knows of possible certified suppliers of vessel heads, I would greatly appreciate the information.

 

[Wecos]

Fawkes, thanks you for your reply. The requirements we follw for our PED vessel components are:

1) The mill must hold ISO 9000 certification issued by a registrar resident in the European Community.

2) In addition to the material specification, the requirements of a. or b. must be met:

a. Original Manufacturer’s Material certs must show conformance to EN10204-3.1B and the ISO Certification, or

b. The manufacturer must supply a copy of the ISO 9000 Certificate with the original manufacturer’s material certs.

3) Original Manufacturers material certs must contain (or be accompanied by a document that contains) a statement that the material is in compliance with the material specification.

We assume the 'mill' to be the last process performed to the material involving heat application. In the case of a 7/8" thick head, I would assume Hot Forming would be required and the the head manufacturer would then become the 'mill'. Am I still going in the wrong direction with this?

 

[Wecos]

Thanks again for all the help. I have sent that information to a few suppliers I know of. Hopefully we can work it out. So glad thats been clarified!

 

[PVinspector]

Wecos,

If they are hot-formning the heads then you have to address the question of whether they changed the mechanical properties. If so, then the head manufacturer rather than the mill becomes Material Manufacturer and they may have to retest after forming. It all depends on if mechanical properties are changed, and the PED does not give a lot of guidance here.