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  • Users: fvincent
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  1. fvincent

    Klaraid IC1176L

    Dear friends, A company I have been working for is testing in the second stage of its wastewater treatment plant the use of Klaraid IC1176L (based on polyaluminium chloride) to obtain sulfate removal. The sulfate content of the influent is around 1200 ppm (mainly as calcium sulfate). Tests...
  2. fvincent

    large motor plus LCI for cracker compressors

    Dear colleagues, Some crackers in France employ electric driven compressors for charge gas, C3R. TOTAL plant in Gonfreville has a 35MW electric driven CGC. Why such practice is not so widespread (except in new LNG plants and compression stations))? CAPEX only? Reliability? It seems a very...
  3. fvincent

    pressure drop in seawater lines HDPE

    HDPE pipe manufacturers sustain that HDPE pipes maintain a very low rugosity even for seawater intakes and pipings (< 0.015 mm) That sounds non-realistic to me. I was wondering if you have a better figure of the effective rugosity of HDPE pipes after some months/years of use. The case I am...
  4. fvincent

    A 335 P23 vs P91 at 567oC

    Do you have any experience with comparing P23 and P91 for steam lines connecting boiler to turbine (400 t/h, 130 bar abs at 567oC)? Is P23 already used in certain extent? Any idea of their costs in USA or Europe or Japan($/kg)? Thanks a lot fabio vincent www.figener.com.br
  5. fvincent

    A335 for superheater coils

    Is it permitted to construct the superheater coils with SA-335 P22 instead of SA-213 T22, according to ASME Section 1? The reason for that is only availability. Thanks a lot regards fabio vincent www.figener.com.br
  6. fvincent

    choking flow in micromotion flow element

    Have you ever used the online software of micromotion (emerson) and detected that compressible flow is not taken into account? Or am I wrong? For a general gas there is no field for cp/cv and depending upon the mass flowrate given certain pressure, density and temperature , velocity higher than...
  7. fvincent

    hygroscopic properties of sodium phosphates

    I am concerned with the operation of a bag filter designed to remove dry sodium phosphates from dryer exhaust gases. Exit temperature is from 120 to 140oC and water dew point is 65oC. As far as I know the presence of sodium phosphates (specially NaH2PO4 and Na2HPO4) which are very hygroscopic...
  8. fvincent

    NFPA 85 and low BTU fuel gas

    Dear colleagues One of my clients intends to have their existing boilers complying with NFPA 85. The boilers operate firing blast furnace gas, coke oven gas, steel furnace gas and some sort of tar occasionally. I suppose NFPA does not apply to such fuels. Am I correct? Anyway, as a safety...
  9. fvincent

    Distillation - mechanical recompression

    I was wandering about the technical and economical feasability of using top vapours stream of a rectification column of isopropanol as heating agent of its own reboiler, after a mechanical compressor. I need some help in order to find out who supplies such equipment and who has already...
  10. fvincent

    recirculated flow for keeping solid suspension

    I wonder if the use of pulp recirculation from tank back to tank is not as efficient as rotary mixers/agitator My case is a homogeneization tank of nitrocellulose pulp. Tank volume is 100 m3 and the tank is fed with different batches in order to mix them and keeping solids in suspension prior...
  11. fvincent

    soda regeneration from sodium sulphate

    Can we expect that a solution of 20%w of Na2SO4 to which lime is added produces a precipitate of gypsum plus regenerated soda ? Or the reaction is in the other direction? The regenerated soda after filtration - if the reaction in the desired direction - would be contaminated with soluble...
  12. fvincent

    viscosity of Na2SO3 solution

    Can some one help me find the viscosity of a 20%weight Na2SO3 solution at 40oC? Thanks a lot fvincent
  13. fvincent

    turbine by pass valve: thermal shocks

    Some of my clients report problems in 120 bar, 538oC by-pass valves, mainly due to thermal shocks. Some say that such shocks are intrinsic for high temperature differences between inlet at 538oC and outlet at 18 bar, 485oC (isoenthalpic expansion). My main concerns are: - valve does not open...
  14. fvincent

    ecentricity of bearings

    I refer first to crank sliding bearings. What are the minimum clearance and the minimum eccentricity possible considering the best technology available for a let's say 100HP engine? (4 cylinders at 5000 rpm) In fact I have in mind some special applications - a kind of gear pump or rotary engine...
  15. fvincent

    eccentricity in bearings - rotary machines

    I refer first to crank sliding bearings. What are the minimum clearance and the minimum eccentricity possible considering the best technology available for a let's say 100HP engine? (4 cylinders at 5000 rpm) In fact I have in mind some special applications - a kind of gear pump or rotary engine...
  16. fvincent

    eccentricity in bearings - rotary machines

    I refer first to crank sliding bearings. What are the minimum clearance and the minimum eccentricity possible considering the best technology available for a let's say 100HP engine? (4 cylinders at 5000 rpm) In fact I have in mind some special applications - a kind of gear pump or rotary engine...
  17. fvincent

    torque detector application

    Besides the use of torque detectors for hydraullic wheel, do you know anything about its use for fuelling control? I learnt something about torque control for hybrid cars..Did you? What are the features of such torque detectors, that is, the way they are integrated to the control module, their...
  18. fvincent

    Veselovsky and Papp rotary engines

    Have you ever heard of these two models of rotary engines? How long do they exist? What is the current stage of development of them? regards fvincent
  19. fvincent

    Thermal waterhammer: steam sparger

    Have you ever experienced strong vibrations in water tanks provided with steam spargers? The sparger is made of several holed pipes forming an hexagon on the bottom of the tank. The holes are 6 mm and were drilled on the top of the pipes Low pressure waste steam from batch processes is used to...
  20. fvincent

    HCl in the stack

    What are the main sources of HCl in flue gases condensate downstream a wet FGD system? How can I calculate the concentration of HCl in the stack condensate given the Cl content of fuel, of process water (used for lime milk preparation) and of calcium sulfate (cake)and given the water...

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