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  1. finechem

    Convestion coefficient in a jacketed vessel

    I am trying to calculate the convection coefficient for the heat transfer surface in a jacketed reactor. I have completed water tests and have determined overall ht trans coef, but I would like to get an idea for what is happening in the jacket when I change heat transfer fluid properties...
  2. finechem

    Charging prill BPA - dust/fines explosivity

    Looking to eliminate manway charge of Bisphenol A prill charge operation (BPA - low ignition energy, low conductivity, high explosion constant, high peak pressure - note particle size dist 35% less than 400 micron). I receive BPA in 50 lb bags - charge ~30 bags/batch to a grounded/inert...
  3. finechem

    Methanol Storage, venting

    Methanol does not have a high vapor pressure and will therefore not present a significant loss in a nitrogen vapor space at amb temp. Best way to pad this tank is N2 regulator @ 4"w.c. and a conservation vent (weighted, or spring opposed, would recommend with vacuum breaker at 0 "w.c.) set to...
  4. finechem

    Solvent Loss - N2 Purge

    Thanks - you are correct that the volumetric flow will be high at times - to elaborate I will have a small control valve for fine control and a larger valve for higher volume operating on a split range pressure controller. I have included a dead band, although I can set to zero only I believe...
  5. finechem

    Solvent Loss - N2 Purge

    I have a 10,000 gal batch distillation pot with 4 receivers operating 24/7. Currently I have an N2 purge on pot and all receivers. When fractionating (THF @ atmospheric pressure) our solvent losses are enormous (condenser discharge 65F) - no secondary. All vent lines tie into a vent header...
  6. finechem

    Hydraulic pump unloading valve

    Sorry for confusion - see thread378-159514 in Piping & fluid mechanics engineering. The discussion has become a good one with equipment and operating condition recommendations.
  7. finechem

    Hydraulic pump unloading valve

    Thanks for all the good information - I will read up on PVB (and swash plate swivels - interesting that my pumps should run static with little or no flow on relief valve ) - I will check relief valve operation and adjust if necessary. Also I overlooked filtration during low flow conditions -...
  8. finechem

    Hydraulic pump unloading valve

    No - not very common but often goes unnoticed for various reasons. Schematic is very simple, pump, relief valve, one side to reservoir, one side to supply to header, several branch lines to point of use (Vickers FG03 flow control valve - no bypass), with point of use return going to return...
  9. finechem

    Hydraulic pump unloading valve

    Still learning terminology - It is a Vickers CG10F30 remote pressure compensator (pump is Vickers PVB90) - and as you said is really just a really a relief valve to reservior - the temperature rise would then be from the recirculating fluid continuing to move across the hydraulic pump. So I can...
  10. finechem

    Hydraulic pump unloading valve

    new to hydraulics - I have a bank of 4 hydraulic pumps @ nominal 90 gpm each powering various hydraulic equipment (reactor agitators, etc.). The pumps each deliver to an unloading valve and then to system or reservoir. As the fluid is returned (from plant) it goes through a cooling heat...
  11. finechem

    Hydraulic pump unloading valve

    new to hydraulics - I have a bank of 4 hydraulic pumps @ nominal 90 gpm each powering various hydraulic equipment (reactor agitators, etc.). The pumps each deliver to an unloading valve and then to system or reservoir. As the fluid is returned (from plant) it goes through a cooling heat...
  12. finechem

    secondary condenser

    Thank you all for your comments - this is exactly the direction I wanted to take, however I must apologize as I have been in a PHA almost non-stop since posting and only now can reply - I hope that I still have your interest. To start, this is my first post on an engineering forum so I was not...
  13. finechem

    secondary condenser

    e.g., high vapor pressure solvent distillation, primary and secondary condenser - how can the vapor flow from each condenser be calculated @ respective discharge temperatures(no non-condensable flow). For instance, 10,000#/hr THF boil-up rate @ atmospheric pressure (T=150F), what happens when I...

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