Recent content by jcat4

Your input is greatly appreciated rmw. Thanks, Jennifer

Thank you very much for your quick response SnTMan. Considering a temperature of 15°C for comparison, the lubricating oil has a higher dynamic viscosity than water. So, the lubricating oil is thicker than water. As per your reply, I guess this indicates that it would be more difficult to pass a...

Hi All, What is your opinion on the use of water versus lubricating oil when performing a shell side hydrostatic test on a tube bundle (according to ASME BPVC Section VIII - Division 1)? We are mostly concerned with discovering leaks at the tube-to-tubesheet joints. The fabrication of our tube...

Thanks again everyone for all for all of the great feedback. Now just for my own curiosity... It seems that there is no correlation between percent wall reduction and joint shear load strength. Or percent wall reduction and leak tightness. (Or so it seems through some quick research). If this...

Thank you for your input Duwe6. We will not be revising the spec for welded tubes. It was just an option to be considered for the future. That is an interesting point about tubes tightening up during working temperature and pressure. Thanks again.

Sounds good rmw. I only joined the project when the tube bundle was already completed and shipped to site. So I don't really know what happened with the specification or the tendering process. Again, thank you very much everyone for all of your help!

Mike... sounds good. Thanks again. rmw... yes, this tube bundle will go into a shell that can be pressurized. It is not a condenser bundle.

chicopee, the tube ends were rolled. They are not surface welded. The tube bundle is already sitting at our station. (Note: to avoid confusion from my OP, we still have the opportunity to reject this tube bundle even if it has already left the manufacturer's shop.) So, it would be difficult to...

Again, thank you very much for your advice Mike.

Thanks for the quick response Mike. We are more concerned with leak tightness (sorry I forgot to address this in my initial post). Our shell and tube heat exchanger has oil on the shell side and water on the tube side. The water pressure is greater than the oil pressure. Therefore, if a leak...

Hi All, The history docket for a tube bundle we received from our manufacturer demonstrates that several tubes fall outside of the manufacturer's specified percent wall reduction range. We are now concerned that the tube-to-tubesheet joint strength is not adequate for these tubes and we may...