I am currently working on a retro-fit of a calandria type evaporator. I am fast tracking the project and am wanting to get my preliminary design to fabricators for quotes. I have ordered a TEMA standards book to reference the information I need but want to send out prints before the book arrives and need some help.
I am looking for tube sheet hole tolerances and finishes to give the fabricator. The tubesheets are 1" thk SA-516-70. The tubes which are to be rolled into the tubesheets are 1 3/8" O.D. I have asked the fabricators for a 1.389" reamed hole (14 thousands over) with a tolerance of +000 and -.003. Is this to stringent? I could also use help with hole groove infomation and finish. The tube will be rolled into the tube sheets using standard tube expanding rollers.
As mentioned, I have ordered what I believe to be the necessary reference literature. I need help until that arrives. I can firm up the design if I decide to change something after I receive the standards. Its only preliminary pricing.
Thank you
DDS1
