Stainless Metric Tube Connections

[eski1]

I'm hoping someone might be able to help me , we are planning to install some pipework at a clean water processing plant. The Tube is 500mm Dia x 3mm wall thickness in 316 st/st and we have several stabbings coming off of his main Tube as per this one of which is shown here

. I'm trying to figure out if the stabbing which is 200 mm O.d x 3mm wall in 316 st/st will require any additional support to prevent future cracks in operation. This picture

shows the dotted line that was originally modelled and alternative layout using a 22 Deg elbow that we are suggesting doing as this is easier for us to manufacture.

So my question is (albeit i'm fully expecting more information will be required first), is it good practice to use pipe saddles when you get up to the bigger pipe sizes or is there a way with software or otherwise to know when we should be doing something to stiffen up the branch.

Clean Water flows through the pipework at 4 Bar of pressure , although i don't know the flow rate at the moment but am trying to find out

Thanks in advance

 

[LittleInch]

Well first start with your design code - which is?

Usually you need to replace the metal lost in the hole with metal at the joint.

The Stress concentration factor is high and depends a lot on what sort of stress / movement you have at the tee.
A stress analysis will show whether you have a big issue.

At 3mm though you probably have very little to work with and I suspect you will have practical difficulty in welding that with any degree of consistency of weld depth, but maybe this is standard on Stl steel tubing.

Personally I would want all these to be reducing tees....

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[EdStainless]

I have never seen it done with tangential extensions but with other it isn't uncommon to form an extension of the main tube and then machining it flat and butt welding the side branch.

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P.E. Metallurgy, Plymouth Tube

 

[eski1]

Thanks For all your replies