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  • Users: koshyeng
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  1. koshyeng

    Vapor phase concentration

    Is raoults law valid for very low concentration of solute in aqueous solutions? I have 9000 ppm (w) of Acetone in Water and I am trying to determine vapor phase concentration of Acetone at 120F and 760 mmHg. So I converted in to mole fractions ( Xac: 0.00046 and Xwater: 0.9996) With pure vapor...
  2. koshyeng

    Use of Composite materials to alter ASME pressure vessels

    Dear experts, ASME PCC-2 is a post construction code for vessel repairs and alterations using composite materials. I need to repair cracks in of our pressure vessel and composite materials using PCC-2 code will improve the vessel integrity with minimum risk. NBIC inspector, who will be...
  3. koshyeng

    Motor Stator failure

    A 700 Hp motor failed during running with smoke and burnt smell very apparent. Upon inspection, found the stator windings burnt in the slots going to ground. I am attaching couple of pictures here to help indentify possible cause of failure. This motor was in service for 8 years and the previous...
  4. koshyeng

    ASME Section 8 Div 1

    I need to fabricate a 25" long vessel with 14" Sch 10 pipe to use it a pilot plant for 2 - 4 months. Maximum operating pressure is 10psig. A elliptical head is welded to one end of the pipe and a flanged connection at the other end. IS this an ASME vessel or cane exempt from Section 8 Div 1...
  5. koshyeng

    Pin Hole leaks on jacketed pessure vessel

    All, We notice pin hole leak as shown in the attachment. This is a jacketed pressure vessel with 304 shell and 517 CS jacket with internal baffles for chilled water. Could you please shed some light on damage cause? Chilled water is DI water at 47 F which is treated with molybdate. pH of...
  6. koshyeng

    Stripping time

    I would like to know how to calculate time required to strip acetone from acetone-water solution by direct steam injection in an agitated vessel. I have a vessel filled with 300 gallons of water and polymer solution (polymer +solvent) is pumped at 10 gpm. Steam is injected directly to strip...
  7. koshyeng

    wetted area for column trays

    Sir, How do you calculate distillation column wetted perimeter for reflief valve sizing? Thank You
  8. koshyeng

    Pressure drop calculation

    I have a vacuum distillation column with vacuum of 15 inHG being pulled from overheads condensate receiver. There is a pressure equalization line from overheads condenser to this receiver. At increased vapor loads, condenser will not handle so I am installing a vent condenser on vacuum line...
  9. koshyeng

    Static Discharge

    Do you recommend to ground metal containers ( 5 gallon) when filling with acetone through a sample line which is downstream of pump? Unlike low conductive fluids such as toluene, relaxation time for acetone (0.00003 sec) is so less that it will dissipate faster. Please comment if we need to...
  10. koshyeng

    Fugitive emission rate calculations

    Please suggest me some references or articles to calculate fugitive emission rates. For example fugitive emission rates from pump packing emissions,valve packing emissions, flange emissions etc. Addition to my question above, If my emissions from pump packing is 12000 ppm(v) then how should...
  11. koshyeng

    Fugitive Emissions Rate calculations

    Please suggest me some references or articles to calculate fugitive emission rates. For example fugitive emission rates from pump packing emissions,valve packing emissions, flange emissions etc. Thank You
  12. koshyeng

    Acetone-Water Solubility Data

    Sir, I am looking Acetone-Water solubility data. I need to evaluate water flow requirements when increasing acetone concentration in packed bed absorber inlet gas. I do not have design data. This scrubber operates at atmospheric pressure and feed gas inlet temperature is 100 deg F. If I...
  13. koshyeng

    Fire Cause

    Sir, An organic compound with specific heat of 0.39 BTU/lb-deg F awith flash point of 245 F and auto ignition temperature of 850 deg F caught fire when it was trapped between a thermal insulator and an electric heater connected to a processing equipment with operating temperatures at 400 deg...
  14. koshyeng

    flow coefficient for braided stainless steel flex hose

    What would be the pressure loss or flow coefficient in a stainless steel flexible hose? I couldn't find any data online on flow coefficient for a 1" steel hose. Koshy
  15. koshyeng

    Cure in Place Pipe

    Is anyone familiar with CIPP liner for high temperature service? Service temperature is 170 deg F with less than 5% of ketones. Appreciate your advice.
  16. koshyeng

    Baseline monitoring reports

    Does an user required to have baseline monitoring report even though the site doesn't have applicable pretreatment standards (falls under specific industrial categeory which has no applicable pretreatment standards)
  17. koshyeng

    Partial pressure claculations

    Can someone please guide me on partial pressure calculation for this applicaion. I have a tank filled with acetone-polymer mixture(for simplicity I assume 100% acetone) and pressurized to 500 psig with hydrogen. What would be the partial pressure of hydrogen in the tank when the temperature is...
  18. koshyeng

    Motor windings failure

    We recently burnt motor windings. It is a 600HP motor with drive used for extruders. My vendor says it failed due to high temperatures while running at low speeds. I am a Chemical Eng. I always thought at high speeds, temperature in the windings will rise and if reaches above insulation...
  19. koshyeng

    Demineralized water tank coatings

    Does anyone has experience in dealing with phenolic epoxy coatings and BisPhenol with epichlorohydrin coatings? I would like to know which one is better coating for Demin tanks. Appreciate your comments
  20. koshyeng

    Solids minimum ignition energy for inerting

    Guys, I would like to know what standards/books talks about minimum ignition energy levels of solids reuired to provide inerting(inert blanketing)for bulk solid hoppers. Thank You Koshy

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