Looking for a replacement for bronze sil-brazed unions

[JoeBobJenkins]

I'm working on a project where what was used before for 3000lb and 1500lb valve end was a navy drawing for silbrazed unions (DWG 1385943 and 1385946). We're looking to go away from sil-brazing and I was hoping to see if there were another option in terms of a spec I can call out. I was looking at ASME B16.11 but that doesn't really cover what I'm hoping to find (unless I'm reading it wrong). I'm relatively new to this and I've learned they no longer like to use sil-brazing. But I need some sort of standard to make the customer happy.

 

[MintJulep]

Sorry, but the problem that you're trying to solve really isn't clear.

When I ask my wife what she wants for dinner and the answer is "not Italian" I still don't know what she wants to eat.

In general, fittings can be attached to pipes or tubes by:

1. Threads
2. Welding
3. Brazing/soldering
4. Compression

Seems like "they" don't like option 3.

What is "their" opinion about 1, 2 and 4?