BS EN ISO 15614-1 vs BS EN ISO 15614-8 on Tube to Tubesheet of a Boiler

[Steenkoolman]

Good day All.

I need some help in clarification.

There is a retube of a boiler/Steam Generator. Tubes need to be welded to tubeplate. Manufacture standard of boiler is EN 12953
Question : Which BS EN ISO 15614-1 vs BS EN ISO 15614-8 to use to qualify the procedure? and if someone says BS EN ISO 15614-8 then why cant I use BS EN ISO 15614-1 to qualify the procedure to weld the tubes to tubeplate.

Thanks in advance.

 

[XL83NL]

Part 8 is specifically for tube to tube sheets. At first sight that makes most sense to me. What does the (original) design code have to say on this matter?

PS: Dutch?

Huub
- You never get what you expect, you only get what you inspect.

 

[Steenkoolman]

The Following was my findings.

BS EN ISO 15614-8 is for use of heat exchangers and tube bundles ( Presssure Vessel)
BS EN ISO 15614-1 Can be used for welding on steam generator tube to tubeplate. In BS EN 12953-4:2018 Paragraph 5.14.2.2 Welding Procedures Specification Refers to EN ISO 15609-1 and Paragraph 5.14.2.3 Procedure qualification records refers to EN ISO 15614-1. No where in BS EN 12953 does it mention BS EN ISO 15614-8 to be used.

 

[XL83NL]

Clear. Then how did EN ISO 15614-8 end up on your table?
PS: from a welding perspective, it doesnt really matter (that much) if the application is a boiler

BS EN ISO 15614-1 Can be used for welding on steam generator tube to tubeplate.

or a HEX

BS EN ISO 15614-8 is for use of heat exchangers and tube bundles

The joint detail is what matters, and the technique required to achieve a sound weld. Hence, from that reasoning, part 8 seems to make more sense. But if the design code has something to say on this, follow the code.

Huub
- You never get what you expect, you only get what you inspect.

 

[Vikko]

It is:
ISO 15614-1 general
ISO 15614-8 specifally for Tube-To-TubeSheet joint.

The ranges (on materials, diameters, thickness) are quite different , many concepts are different (in 15614-1 there is the deposited thickness for process 's' which is important, while in the 15614-8 is simpler, there is just the thickness 't' of the parts, in 15614-8 there is the tube pitch, etc), they are very different standards.

I think you could use 15614-1 for everything, but because it is much more complicated, it is better to use 15614-8 just for tube-to-tubesheet