What is the smallest size of pipe to which I can Weld a 1 inch pipe Perpendicular to the Axis?

I would to know what is (or how to calculate) the size (dia) if the smallest pipe to which I can weld a 1 inch pipe from the side of the bigger pipe perpendicular to its axis (like a tee).

• You can weld it to 1/8” pipe then fill the gaps... but you may want to clarify your question... Aug 17, 2019 at 4:59
• Like Solar Mike is saying It seems that you can weld whatever size you want. I think your question might be more to what is appropriate to achieve a certain level of strength in the connection?? You should clarify. Aug 17, 2019 at 5:00
• This is for a steam manifold that will have steam at max 20 Bar. So, I would like it to be strong enough to handle the stress. The outlets from the manifold will be 1 inch. There will be 8 such outlet lines. The 1 inch outlet will also have a heavy steam valve on it (which will be provided support) Aug 17, 2019 at 5:50
• This is for a steam manifold that will have steam at max 20 Bar at around 400Degree Celsius. So, I would like it to be strong enough to handle the stresses. The outlets from the manifold will be 1 inch. There will be 8 such outlet lines. Also, each 1 inch outlet will have a heavy steam valve on it (which will be provided support). | My main doubt is, if the main line is too small a larger portion of the surface will have to be removed for each outlet, reducing its overall strength Aug 17, 2019 at 5:56
• If you are wondering the Main line size is too small for super heated steam - the flow rate is just 125 gm/min Aug 17, 2019 at 5:57