vents and drain for heat exchangers
vents and drain for heat exchangers
(OP)
I would like to seek help regarding requirement for vent and drain for heat exchangers. Kindly advise when this is necessary if the process data sheet did not show this nozzles on their documents.





RE: vents and drain for heat exchangers
You have to look at your design and insure that it can be vented / drained.
Regards,
Mike
RE: vents and drain for heat exchangers
Cheers,
gr2vessels
RE: vents and drain for heat exchangers
As "SnTMan" mentioned, all exchangers shall be capable of venting and draining for hydrotest purposes. If such can be achieved with other nozzles, nothing wrong with this. Again oreintation of such nozzles (vent to be at the highest point and drain to be at lowest point) during hydrotest is vry important. Other methods can also be used if nozzle used for venting purpose is not at the highest point.
Just my thoughts..
Strain2
RE: vents and drain for heat exchangers
RE: vents and drain for heat exchangers
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Fitter, happier, more productive
RE: vents and drain for heat exchangers
Regards,
Mike
RE: vents and drain for heat exchangers
--------------------------------
Fitter, happier, more productive
RE: vents and drain for heat exchangers
RE: vents and drain for heat exchangers
RE: vents and drain for heat exchangers
I've got a couple of Hx's that are made from slices of 12 to 18NPS pipe, but were spec'd by our ChemE's at low pressures, low temperatures, and without Full Vacuum. So if I need to use a c/s Hx above it's 300°F MAWP, we have to pay for an Alteration. If the idiot had asked for the "best temperature" he would've found out that the material doesn't derate until 600°F, but no, specify 300 and only get 300. Same for F/V - if he had asked for it, the Hx would've been rated at F/V - small Hx's inherently withstand F/V with no design changes. And our drain nozzle is set-in, and will require significant grinding to get it down to Free Draining.
If you're not experienced enough to see these problems, get somebody who is to help review the proposed dwg's.
RE: vents and drain for heat exchangers
Regards,
Mike
RE: vents and drain for heat exchangers
For horizontal exchangers, process connections can be used as vents and drains.
For vertical exchanges, there's usually a few centimetres between a tubesheet and a process nozzle which poses a problem to drain and vent. To get over this hurdle, the tubesheets are usually drilled vertically through half the thickness and then then drilled horizontally to atmosphere and connected to a nipple and valve for venting/drainage.
RE: vents and drain for heat exchangers