11echo, Thanks for sharing educative conversation along with your own opinion. Such efforts of senior members are highly appreciated....

Thanks JOP @11echo, These transformers are installed in open area with three side firewalls and one side gates. Requirement of firewater deluge sy...

I think 1 M clearance between two above ground pipelines is more than enough. Keep closer..... 300mm cleareance is enough

Take a REAL close look at the drawing of the header piping and the answer will be clear! The subjected concept is still not clear, please educate me....

As per my own experience, ATM Vent shell not be less than 3M from highest operating platfrom / grading in nearby area. But it may vary project to proj...

Thanks all of you for sharing your knowledge n experiece. Unfortunately I couldn't get complete answer.

I haven't seen such thing in codes. In some sizes we need pup piece between Tee & High rating Flange (flange for valve installation) for bolt remo...

Well explained by Mr.JOP. I remember you are same question in same manner couple of months ago and that time it became clear for me. Thanks a lot.