Do these pumps take suction through dedicated lines direct from the source expansion drum ? Could there be gas carry under through that first pump's feedline?
You should have dedicated upper and lower sumps, each with its own level control and liquid exit to the downstream collection header. Can we see the PID for this ?
PSV inlet line : Standard practice would be to include the control valve exit into the inlet line dp calcs.
PSV exit line : Standard practice is to keep exit line velocity at <0.7Mach for brownfield applications, preferably <0.5Mach for greenfield, even if your exit line dp < 10% of PSV set...
Have you checked with the field instrumentation engineer whether you have the right impulse tubing line arrangement to the dp cell for measuring DP in dewpoint gas service ?
Apart from liftgas injection, GOR is higher for lighter crudes and less for heavier crudes. It is obviously directly related to the chemical composition of the reservoir fluid.
I dont have direct experience working with or in the design of activated carbon adsorption units in gasoline tank VRU service. There doesnt seem to be a grade of mole sieves that would enable this adsorption of heavy hydrocarbons ( paraffins + naphthenes + some aromatics) from an air stream at...
Okay, thanks for reminding me-the rundown tank is only meant for emergency cooling of bearings during a total stop.
Drawing shows no check valve or trip valve on the rundown line leading into the main oil supply, so what stops oil from reversing into this rundown tank in normal operation ...
Strange, are those "N2 bottles" these bladder accumulators ?
And your rundown tank appears to be on gravity based feed into the lube oil circuit - the ones I've seen are pressurised rundown tanks.
If the rundown tank level is low in this gravity setup, then the feed pressure at the lube oil...
Is combustion flue gas on the shellside ? If so, there may be contaminants in the fuel oil that are not compatible with the shellside material. It may be due to H2S, resulting from incomplete combustion of traces of sulphur in cheaper grades of fuel oil. Condensation of the flue gas on the shell...
Its a buddy racket with the Engineering Council UK / I Chem E / I Mech E / I E E/.... and this a much larger operation. Heaven knows where all this money goes....
For starters, take a look at differences in vapor pressure, density and viscosity between these 2. Presume this is a re run storage tank that may be used for storing cold start hydrocracker product also, so there may be a wide range in these physical properties to be considered. What is normal...
Are you injecting some kind of ammonia solution upstream of electrostatic precipitator for corrosion control ? Some months ago, there was a posting on E tips about problems related to amm sulphide caking up in the ESP. Could these whitish fumes be amm sulphide / amm sulfite? Ammonia reacting...
Apologies, my earlier response is incorrect. For liquid thermal expansion case only, Q, U and LMTD will be considerably different, since flow will be much less than design case. Flow may well be laminar inside the tubes ( or may be natural convection depending on limiting case Reynolds number)...
U and Q will be much lower with PSV on tubeside inlet, since the flow path to the PSV almost completely does not pass through HX. As you said, flow in HX will be almost stagnant - it will be in natural convection mode.
