Piping Branch Question

can we directly attach a fitting by stub in or out method .. the pipe size is 400nb ...



i know about supports & its uses .. i wan to know exact location & what type of supports to be used .. s there any good books which will guide me ..

We used to use stub ins and repads more in years past but most branch tables do not allow for their use now. The prefered method is an olet or tee size depending. It depends on the spec and service as some specs may call for sweepolets if it is 100% RT, laterals if there is flow shearing involved. They are rarely used in Oil & Gas now but I believe the mining industry still uses them. They can be time consuming as the stress department has to calculate the stress at the joint and design a re pad.