Design of Brazed Nozzle/Branch Connections

[Strook]

G'day guys,

Aussie here working with AS and ASME codes relating to vessels and pressure piping.

Looking to design a brazed nozzle connection for a vessel and piping branch connections and not finding many resources within or outside the codes as to how to:
a) specify brazing filler metal
b) assess strength of, or need for, reinforcement
c) assess strength of brazed connection

Does anyone have any suggestions on how to understand the strength/capacity/requirements for brazed connections?

My particulars to the problem at hand involves dealing with compressed nitrogen, 300 bar @ ambient temperature, with 304L tube/pipe.

Kind regards,
Tom

 

[XL83NL]

Im assuming ASME VIII-1. Refer to part UB on requirements for PV's fabricated by brazing.

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

 

[Strook]

XL83NL,

I've read through this section a few times and not really finding the information I need to satisfy my questions. I'm expecting to find typical UTS values for filler metals, methods to assess joint strength i.e. shear failure, tensile failure, acceptance criteria and reinforcement requirements. Section UB, from what I can tell, doesn't offer this.

I'm aware that there is a graph produced in the 1930's which describes joint clearance (in/mm) vs. joint strength (psi/MPa) however the basis of this study is not well documented.

Any other ideas?

Tom

 

[XL83NL]

I’m not familiar with UB so can’t really help you further. 300 barg ‘feels’ a bit high for a brazed connection but that’s just a gut feeling.
PS: no need to create a new topic as a follow up, the discussion can continue here.

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