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  • Users: c2sco
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  1. c2sco

    Flash points in NFPA Haz-01

    Please can anyone tell me if the flash points quoted in this document (previously NFPA 325) relate to closed cup values or open cup ones? Thanks.
  2. c2sco

    Redundancy / discrete systems in modern DCS systems

    I'm a chemical engineer in England, involved with safety integrity assessments for chemical plants. I'm struggling with understanding the meaning of multiplicity, or redundancy, inside modern DCS systems, which is often relevent to these assessments. We work to BS EN 61511 / BS EN 61508, where...
  3. c2sco

    Evaporator design criteria

    Hi, I'm designing a new evaporator as part of a plant modification in the UK. It will replace an existing evaporator that will be too small for the modified process. The evaporator removes water from organics. It has forced circulation, the external pump pushing a high flowrate of liquid...
  4. c2sco

    Low temperature refrigeration

    Hi, I need to design a heating / cooling system for a small batch process. Its duty will be to supply alternately heating and cooling to any one of four jacketed vessels, either about 5 kW heat load cooling at -100°C (-148°F), or 10 kW heating at +100°C (212°F), as the batch process progresses...
  5. c2sco

    Motor inertia information

    Please can you point me to information on how to estimate the inertia of a motor from its power, speed, etc, and to tables of data for the same? Thanks
  6. c2sco

    Typical water treatment regime

    Hi, I'm doing a very preliminary specification of a plant that will include a large evaporative closed circuit cooling system. Typically these are treated for corrosion inhibition and legionella prevention with eg phosphates and hypochlorite. I dare say there are lots of proprietary systems, but...
  7. c2sco

    Methanol flammability in depleted air

    I'm looking at explosion hazards in a formalin plant which burns methanol in oxygen-depleted air. I can't find a flammability diagram between oxygen, nitrogen and methanol. Can anyone point me to one please? Thanks, c2sco
  8. c2sco

    Doing HAZOPs remotely

    Hi, I work for a small company of chem eng consultants in the UK. We are sometimes approached to chair and scribe HAZOP meetings from companies abroad, especially in the Far East. Travelling to places like that isn't really our area of work, but I've been wondering if it's possible to do the...
  9. c2sco

    How do I calculate the dew point of undried, compressed air?

    I'm compressing ambient, undried air so that I can sparge it into a tank to aerate the contents. Hence the air could have any RH at inlet conditions, even 100%. I'm also installing a cooler as the compressed air is too hot for my process. At what temperature will my air start to form dew as it...
  10. c2sco

    Definition of conditions STP, N, Rbar

    Now I realise thast volume conversions is a topic discussed at great length in other threads here, but none seem to bump into all of this question. I realise that there are various definitions of "standard" gas conditions around in different industries, especially in the USA (and I suspect that...
  11. c2sco

    Inertia of inductrial motors

    Can anyone point me to data on the inertia of motors in the 1kW to 100kW range? Thanks Stuart
  12. c2sco

    Force generated by liquid meeting a restrictor

    Hi folks, I'm looking at a pipe filling with liquid that has a restrictor orifice in it, part way along but some distance from the pump. The line is initially empty and a pump is started at its inlet end, so the liquid runs along the line, filling it. Just before the liquid meets the RO, it is...
  13. c2sco

    Efficiency of air sparger to remove CO2 from brine

    Can anyone offer any practical experience or test data on the likely performance I'll get if I sparge air into a tank containing brine that has dissolved CO2 in it? ::-)

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