HOW TO WELD THIS? 1

[imagineers]

SO i am welding some sanitary ends to a piece of stainless tube to create a manifold. currently the od of the tube is 0.75inches (19.05mm) and so is the mating part on the triclamp end. Now my question is is it possible to cut an arc on the triclamp end and weld it to the manifold tube ? or should I cut a large hole (same OD as the pipe) into the long tube then insert the triclamp piece inside the long tube and weld. I could not find a weldolet triclamp fitting off the shelf.

 

[MintJulep]

What you drew is the "usual way".

 

[TVP]

Your image shows a typical arrangement for welding thin wall tubes together (fishmouth to the end of one of the members). Seems like that design would be preferable to inserting the triclamp fitting into the long tube.

 

[metengr]

Yes, the preferred approach for bioprocessing would be to insert the triclamp into the manifold flush and weld using a full penetration weld from the OD.

 

[DekDee]

There are basically 3 ways you can do it.
1 Install equal tees
2 Use the "Pulled Tee" method
3 Or as metengr has stated - fishmouth with a full penetration weld.

1 Probably the quickest and easiest.

2 Have previously used the "pulled tee" method and it works quite well.
A hole is cut in the run pipe and a steel ball (larger than the hole) is mechanically pulled through the hole forming a "tee" in the run pipe.The ball is the same size as the ID of the branch pipe.

3 The last is the hardest as due to it being a sanitary application zero internal defects are allowed and you only get one chance.
Try doing additional repairs on thin tubing and distortion will ruin the manifold.

Here is a link I found

http://hollandaptblog.com/2014/02/1...-to-build-sanitary-stainless-steel-manifolds/

Hope that helps,
Cheers,
DD

 

[imagineers]

what about using the same OD on the run pipe as the mating fitting OD?