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  1. NeedAHoliday

    The public's view of our profession in the US

    Let's not confuse professionalism with personal views. One can be committed to working in a professional manner and one can be dedicated to their profession, which should in turn increase the perception and status of engineering. However one does not need to care about the public's opinion to...
  2. NeedAHoliday

    Pump Curves

    sailoday28, your right I was talking of dynamic head not static, I did state total discharge pressure in my example, not static pressure, which is as per you response . After re-reading my post I can see where confusion could arise. I assumed Homayun would have sufficient knowledge to...
  3. NeedAHoliday

    Pump Curves

    Homayun, The pump curves will show the total head a pump can generate with respect to the NPSHr, efficiency and power. So saying take the generated head from the pump curve for your conditions, add the suction line pressure (at inlet flange to pump), and you have the discharge pressure...
  4. NeedAHoliday

    The Entitlement Generation

    Okay, my basis: 1. These are my opinions, so feel free to disagree but do not attack. I like a debate, I'm not interested in pettiness. 2. I am in my "twentysomething's" 3. Entitlement is not a priviledge it is as the word suggest a legal term for the rights to benefits etc etc 4...
  5. NeedAHoliday

    Explosive VOC levels

    No the LEL's are not the same for all VOC's. For example Formaldehyde has a LEL of 7%vol in air while o-Xylene has a LEL of 1.9%vol in air. Both are volatile organic compounds. You need to know the composition of the the VOC's being emitted to determine it accurately or go to the supplier of...
  6. NeedAHoliday

    The public's view of our profession in the US

    Not sure of other parts of the world but within Australia there is a relatively high regard for the engineering profession I believe. The main issues I perceive within the profession are 3 fold: 1) I believe the quality of the qualifications has decreased since the advent of higher education...
  7. NeedAHoliday

    pressure regulators in series

    Have a look at thread798-125227 for a good discussion on the J-T coeeficient. Cheers, K.
  8. NeedAHoliday

    Caustic Service Material Selection

    Thank you for the response, most appreciated. K.
  9. NeedAHoliday

    Caustic Service Material Selection

    I have a solutiona at less than 65C and at pressure of 230kPaa. It will contain <4% NaOH but could see upto 48% in case of process upset/failure. I normally use PVC or PP or HDPE for this type of service but I have recently begun to think about steel for some of my applications. I don't...
  10. NeedAHoliday

    Catalytic Converter

    A catalytic converter can be designed for any flowrate you want, the question becomes whether it is feasible. Go to the following link as it descrubes catalytic convertors reasonably well: http://herkules.oulu.fi/isbn9514269543/html/c299.html Just keep clicking next to go through the relevant...
  11. NeedAHoliday

    Combustion Temperatures of BTEXs

    RRE, (This is a copy of my post from Heat: Combustion Engineering) We had a D&C project for destruction of BTEX. We have a operating combustion temperature of ~800C (1472F) to give 99.9%+ efficiency. Generally you need to be above a minimum of 650C (1200F) for any chance at a higher degree of...
  12. NeedAHoliday

    Combustion Temps of BTEXs

    RRE, We had a D&C project for destruction of BTEX. We have a operating combustion temperature of ~800C (1472F) to give 99.9%+ efficiency. Generally you need to be above a minimum of 650C (1200F) for any chance at a higher degree of destruction for BTEX, but this will depend on several other...
  13. NeedAHoliday

    ENERGY CONVERSION

    As stated, great link. K.
  14. NeedAHoliday

    Calorific value of FCC offgas

    Fair enough point. K.
  15. NeedAHoliday

    Calorific value of FCC offgas

    Brainstorming, Having just read this thread I feel I need to provide comment. An engineer that questions and extends himself and others through his/her queries/responses has the potential to be exceptional as you will always be seeking knowledge, understanding and improvement. An engineer that...
  16. NeedAHoliday

    Heat of combustion CNCG

    I though CNCG meant concentrated non condensable gas, as such we would need to know what you CNCG composition is to give a correct answer. Unless someone out there knows of a standard rough figure that is typical of some streams?? Cheers, [2thumbsup]
  17. NeedAHoliday

    pH vs % caustic solution

    brainstorming Would have thought this would be elementary for a chemical based professional to determine?? Or am I being to harsh?? Think you mean mol/L not mol/g. Anyway... Density of 2% NaOH at 50C is 1009.2 kg/m3. If we have 1L then we have 1.0092 kg of solution. m(NaOH) = 0.02 x...
  18. NeedAHoliday

    NaOCl+NaOH scrubber

    Re-read your post, I don't have to assume waste water as it is written. Should have read a little slower. Cheers.
  19. NeedAHoliday

    NaOCl+NaOH scrubber

    gncm, You state your chemical so this should be bread and butter for you. I will also assume this is for a waste water treatment facility as this would explain the breakdown. In any event the reactions you want are below: H2S + 4NaOCl + 2NaOH --> Na2SO4 + 4NaCl + 2H2O CH3-SH + NaOH + 3NaOCl...
  20. NeedAHoliday

    Caustic plus HCl---What happens?

    gladkenn, Heat of Neutralisation of HCl and NaOH is approx -57.1 kJ/gmol. Lets say you have equal quatities of HCl and NaOH and have 10m3 of 48% NaOH at 40degreesC and stoichiometric equivalent of HCl then you have 14,922 kg NaOH solution which contains 7,162.6kg NaOH = 179,064gmol...

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