Do you have access to a copy of ASME B31.1 (Power Piping) or B31.3 (Process Plant Piping) and have you read the section on how to calculate for reinforcement?
Suggest that you consult the limitations and recommendation in both a piping code (such as ASME B31.1/B31.3) and the Piping Line Class document that you are using.
Piping "stub-ins" are not as strong as ANSI piping tees or weldolets. Thier design and reliability is far more subject to the whims and skill level of the installer than all other types of joints.
Under hydrostatic pressure stub-ins will fail at a lower pressure than tees or weldolets
If you are installing a piping system without any referenece Piping Line Class and deciding on components "on the fly"........watch out.
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Yes PennPiper, but this (paragraph 304.3 of ASME B31.3) illustrate how to calculate if the stub-in need to be reinforced or not, and my interest is to know when can I use a direct stub-in in lieu of fittings in specific applications.
the piping class indicate an equal or reduced tee to make a branches from header, but this is general, and if we don't have a severe service conditions I think there is a way to minimize the use of fittings , so is there any approved way that permits to take the right decision between the use of fittings or stub-in.
Local piping codes, project engineering specifications, or contract documents may dictate the use of weldolets or reduced tees. Be sure to check.
If the pressure involved is well within the pipe strength, an old rule of thumb said that if the branch pipe is at least two standard sizes smaller than the main, stub-ins were acceptable. Otherwise you had to real fittings.
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Branch Connections
Re: Branch Connections
