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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).

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  • $\begingroup$ You can weld it to 1/8” pipe then fill the gaps... but you may want to clarify your question... $\endgroup$ – Solar Mike Aug 17 at 4:59
  • $\begingroup$ 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. $\endgroup$ – ShadowMan Aug 17 at 5:00
  • $\begingroup$ 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) $\endgroup$ – ZenMaster Aug 17 at 5:50
  • $\begingroup$ 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 $\endgroup$ – ZenMaster Aug 17 at 5:56
  • $\begingroup$ If you are wondering the Main line size is too small for super heated steam - the flow rate is just 125 gm/min $\endgroup$ – ZenMaster Aug 17 at 5:57

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