Sound Engineering Practice (SEP) - does this or an equivalent exist in ASME

[Johnbysea]

I am designing a new laboratory scale equipment which will be sold worldwide. It contains a small pressure vessel. With PED I determine that the equipment is a vessel and that my liquid is in Group 2. This takes me to a particular chart of pressure versus volume. The product of my vessel volume and pressure is low so that my design falls under SEP. I would like to know if there is an equivalent straightforward route with ASME?

Also, does anyone know of a sensible guide to help navigate ASME pressure vessel documentation?

Thanks,

John

 

[XL83NL]

No, there's not. The reason is that the PED 20148/68/EU (which youre referring to) is a Directive, whereas ASME BPV Sec VIII Div 1 is a design code. The 2 are not the same. To simplify things grossly, PED tells you (when the ESR's apply, thus for PED cat I and greater) a design calculatio needs to made. It doesnt say how a vessel needs to be calculated. ASME tells you how you have to calculate the applicable parts on your pressure vessel, but it doesnt really tell you when the design code applies. Local jurisdiction may dictate the application of ASME, e.g. by stamp, but ASME itself doesnt.

I dont have a sensible guide on the required pressure vessel documentation, a search through this site will however help you.

IU think your real question should however be; what minimum documentation do I need to provide with me equipment? Furthermore, whats the reason to choose ASME? If PED applies, EN 13445 may make more sense.

What equipment are you dealing with? We buy a lot of laboratory scale equipment and I have often dealt with this question about design code, PED, and what applies for documentation under 'SEP'.

 

[JStephen]

A "small pressure vessel" may fall under the exemptions in ASME, depending on the size. Also note the exemptions for piping equipment, etc.

 

[Johnbysea]

Thank you both for your replies. The system contains a vessel of 4L volume which at times is pressures up to 4 bar. It contains a water-like liquid and a headspace of either pressurised air or CO2. It is a carbonation system for research purposes. There are various headspace gas connections of minimal volume and a liquid recirculation loop, again of small volume. Total volume of vessel and all pipework will not exceed 6L.

My question is what documentation is required in order to sell into the USA.

 

[XL83NL]

A couple of things I noticed.

- In your OP you talk about fluid groups, whereas in your last reply you mentioned to sell it in the USA. Which applies? I assume you dont need both, i.e. seeling to US with CE
- Having a pressurized cushion of CO2 or air means the PED fluid group should be 'non-dangeorus' gas rather than fluid. Your assessment is incorrect. This still keeps it SEP though @ 6barg, 4 ltr.
- Volume of the vessel determines vessel category. Lineisze of the pipework determines piping category. Dont mix up. Together, theyre an assembly. The PSV is always cat IV (highest)
- What you should do is check with the local jurisdiction (of the state youre selling equipment to) which rules apply and if stamping is required.

http://info.lr.org/l/12702/2017-02-15/3m1nr6#

https://www.nationalboard.org/ViewAllSynopses.aspx

PS: details for retention of records are found in ASME VIII-1:2017 appendix 10, para 10-13, page 4279