Its true that in order to prevent thermal degradation of hot oil there has to be some min flow through heating coil in fired heater. Maybe this TSHH should be removed in order to, as you say, enable this min flow.
There is also a question of SDVs closing sequence during ESD and PSD. If all...
@georgeverghese
"This is a typical case where design temp for the shellside must be made equal to that for tubeside to account for the case when hot oil flows through the HX with little or no crude flow, which will happen when the hot oil SDV is nominally closed by action of the TSHH or by PSD...
Its clear that due to some operator error or trip failure "cold side" can see higher than normal operating temperatures, but does that mean that HEx "cold side" outlet line should be designed for this scenario?
I apologize if I went a little bit off-topic, but I think that this is also...
Than one should also consider updating connecting lines design temperature in accordance with design temperature of the HEx?
There is no sense to have e.g. design temperature for tube side 200C and for IN/OUT lines 100C.
thread124-390770
Hi all,
As far as I have seen on this forum there are different opinions regarding design temperature for shell and tube HEx. Some say that it is ok to have same design temperature for shell and tube side, some say that it should be different. Main concern are the tubes whose...
rakuday ,
thank for information. It turned out that on my existing tubesheet expanded joints can't be applied due to tubesheet thickness. Once again thank you for the post.
Hi everybody!
I have a task to calculate expanded tube and tubesheet joint. In ASME VII div 1 App A there is calculation for maximal axial loading in which there is Po and Pt as interface pressures for which is stated that they can be obtained analytically or experimentally. I havent been able...
