Welded Pipes Vs Seamless Pipes ( fire fighting)

If you are an Architect as your title suggests then you should know a engineer that designs these systems for the area you are working in. Fire control is regulated like everything else in this business. So why not ask them?

And that s why I was asking here if someone can help.

So if you know which procedures we should follow, Ill be grateful.

I dont know where you are located, but I'll assume the US. Reguardless...I suggest this is not the place to get this specific very important life saving information. I would ask you to get this information from the National Fire Code. You should also consult your local and/or State Fire Codes. There you will find what you MUST use for pipe not what someone thinks is ok. You will also find all the other requirements you Must comply to when installing such a system. Also If your trying to save costs by doing this yourself and your installation is not to code , Insurance companies won't cover you. I understand that this type of Fire Protecting Equipment is very expensive but If your system is for protecting human life and/or something valuable then its worth do right and to Code. ............................Rescue

You are kindly requested to specify the pipe material specification in accordance with ASTM, in turn we can find its specifications such as allowable tensile strength S, ... etc. it. And by knowing the pipe diameter NPS, we can proceed a pipe wall thickness calculation. Please refer to the following example (just example) : High Pressure Steam Pipe

The difference between welded pipe and seamless pipe is the joint efficiency of the pipe E, where in seamless pipes E = 1 and for welded pipe E < 1.0

t_m = P D_o / 2(SE + y P) + C

For simplicity, you can use the equation : t_m = P D_o / 2 SE + C

Without knowledge of your location the proper building codes can not be used to give you a correct answer.

Also is this a dry or wet system?

Hey I didn't make the rules but in the US you can over build it and a building inspector or fire inspector can make you tear it all out and redo it.

Brad

it s a wet system.

And I believe that these welded pipes should be in compliance with ASTM A795, no ?

Not my area of expertise. I did install some in my youth and later took a collage coarse on building maintenance and repair. I do know the codes differ for wet and dry here.

sorry I'm not more help

Brad