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georgeverghese, Thats a great suggestion on using the control valve for tank 2's pressure as well. I hadnt thought of that. One of my worries also was the slug of high pressure N2 following the liquid and how quickly the controller could adjust Tank 2 before tripping, or losing a RD. I...

EmmanuelTop, thanks for the insight. "I have problems understanding the function of the control valve between the two tanks during purging. Why do you need it in the first place?" The control valve between tank 1 and tank 2 is only used for the hazardous material move, as we control how...

Check valves are not allowed per our policy, assuming that is a non-return valve. We have trouble at all times with this nitrogen purge meeting the backflow policy no matter what status were in (initial purge, final purge), and i belive its because the combination between the orifice plate and...

In addition the piping is definitely a mess. It looks like it was piece mealed together with varying sizes, restrictions and excessive bends/90s etc.

The neutralizing tank (tank 2) is always vented with a controlled setpoint and pressure controller. The issue is during the pushover once the liquid line is pushed out (if we can get it to move before hitting the dP interlock, it can cause a high pressure rise (faster than the controller can...

Hello all, I am looking for some insight on more seasoned engineers in fluids on how we should tackle this problem. Today I have a distillation reciever (Tank 1) that we weekly will push over to a neutralizer (Tank 2). The fluid is dirty and will plug up lines if allowed to sit, so operations...

Hey all, I am working on a maintenance replacement of a graphite shell and tube heat exchanger. The primary use of this exchanger is to condense phosgene and methylene chloride. The issues im running into is the service life on the shells of the exchangers is poor on average 15 years, well...

Thanks TBP, What I ended up doing when I originally calculated this was I looked at our flow tag that trends live on the DCS, assuming its accurate it says we flow 10,000+ lbs/hr of steam. I took this times the hfg of 150 psi steam (857 BTU/lb) to get the 10MM BTU/hr figure. When I looked at...

Thanks for the replies. I did have a realization though, and likely had I provided more information it would make more sense, but this is a closed loop drier, and likely some water vapor or even liquid is en-trained in the air stream, so not only am I heating the air the large heat sink could...

Interesting thoughts. One adder to this is that I do see a resin (plastics) carryover into this heater box causing fouling on the heater coil. This could be part of the heat sink effect. Second I used the static pressure and fan curve to estimate the quantity CFM of air based on the fan...

Hey Folks, I'm interested in an open discussion for a phenomenon I'm seeing. Basically I am heating an incoming air stream on a drier with steam, I calculated the Q requirement to heat my air stream be on the order of 5MM BTU/hr, however the flow controller and steam pressure says im using 10MM...