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BS PD:5500 vs. ASME Sec VIII Div 1
3

BS PD:5500 vs. ASME Sec VIII Div 1

BS PD:5500 vs. ASME Sec VIII Div 1

(OP)
Anybody know the major difference between these two codes?

RE: BS PD:5500 vs. ASME Sec VIII Div 1

2
Yes

rhg

RE: BS PD:5500 vs. ASME Sec VIII Div 1

(OP)
rhg,
Could you share a little with me?
Thanks in advance

RE: BS PD:5500 vs. ASME Sec VIII Div 1

It has been a number of years since I worked with BS-5500, but best recall is that it was more like ASME VIII Division 2 than Division 1.

Steve Braune
Tank Industry Consultants
www.tankindustry.com

RE: BS PD:5500 vs. ASME Sec VIII Div 1

(OP)
Thanks, SteveBraune.
Used to be a stress engineer dealing with Div 2 and Section III for years, so more interests in the design by analysis philosophy. According to your comment, BS5500 is equivalent to Div 2 or Section III of ASME, right?

RE: BS PD:5500 vs. ASME Sec VIII Div 1

zjliang,
I guess I was thinking more along the lines of allowable stresses and design results.  BS-5500 had much higher allowable stress values than Div 1... much more like Div 2.  But those observartions are from many years ago.  Sorry to have gotten you off track on this.

Steve Braune
Tank Industry Consultants
www.tankindustry.com

RE: BS PD:5500 vs. ASME Sec VIII Div 1

zjliang,

PD5500 is essentially EN 13445. As Steve pointed out it is similar to Div.2

To give the quick answer to your question the general differences between PD 5500 and Div 1 and similar to the differences between Div. 1 and Div. 2.

In some cases, PD 5500 allows higher stresses than Div. 2. Duplex stainless is a good example of this.  For example, 2205 can have an allowable tensile stress of greater than 31000 psi at 175C.  Vaccum is handled differently than ASME.

PD5500 has tighter tolerances than ASME. For example, maximum out-of-roundness for external pressure is 0,5% but it is not measured based on Dmax - Dmin. Vessels exceeding this can be analyzed to see if they are acceptale.  However, if the peaking values in PD5500 are exceeded additional engineering is not permitted to make the vessel acceptable.  I've just been through a case with a large (10 m diameter) pressure vessel where both of these issues had to be addressed.

PD5500 also has more fabication tolerances than the ASME codes. maximum deviations of nozzles from tangent lines are specified.

There can be greater NDT requirements.

I know this is slightly off what you are looking for but differences in design rules and allowables also have a price which often is not seen.

I hope this helps.

RE: BS PD:5500 vs. ASME Sec VIII Div 1

PD5500 is NOT EN13445, EN13445 is comprised of PD5500 and AD-Merkblatt mainly with a bit of Stoomwezen thrown in ,the product of commitee compromise, how wonderful:D

There are some other differences:

1. The calculations for cyclinders under internal pressure only are different.

2. PD5500 requires production test plates whenever welding duplex or super duplex.

3. The impact test requirements are different.

4. There are no provisions in PD5500 for thick walled vessels.

5. PD5500 generally has higher allowable stresses.

6. The ratio for calculating the minimum hydrostatic test pressure is different.

7. Enquiry cases are always provided with PD5500, code cases are seperate and must be researched sperately for ASME VIII Div.1.

8. The factors for flat heads are slightly different.

9. PD5500 specifically states that design paremeters must appear on the drawing given to the customer, although drawing can be transalated to document.

10. There is no joint efficiency factors in PD5500 but it does insist on NDE for category 1 items.

11. PD5500 produces less conservative designs than ASME VIII Div.1.

And then there is the biggy:

Producing in the UK: Easier to produce to PD5500, ASME inspectors are a lot tougher than in the US.

Producing in the US: Easier to produce to ASME VIII Div.1, PD5500 and PED inspectors a lot tougher than in the UK.

Can't wait until we get an ISO Boiler and Pressure Vessel Code but I think there's a snowball's change in hell of that happening, the various bodies make too much money and can introduce trade protection practices with the current system.

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