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  • Users: Leclerc
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  1. Leclerc

    Design Pressure and Design Temperature

    [I have posted this in the API Codes Forum a few days ago, but no bites, yet] As I understand, within the vessel Codes there is an allowable accumulation ( say 10%) which may be applied to design pressure/ MAWP. Also, where relief valve set pressure is set at this design pressure/ MAWP and...
  2. Leclerc

    Design temperature and relieving temperature

    As I understand, within the vessel Codes there is an allowable accumulation ( say 10%) which may be applied to design pressure/ MAWP. Also, where relief valve set pressure is set at this design pressure/ MAWP and there is overpressure of, say, 110% of set pressure, the valve relieving pressure...
  3. Leclerc

    locomotive steam injector: does it work?

    On a steam locomotive, how does the boiler feed water injector work, when the only motive steam available is that from the boiler itself, which is at the same pressure to which the injector must raise BFW? And how show on a Mollier diagram? I understood that, using steam ejector reasoning...
  4. Leclerc

    roughly estimate mechanical seal flow requirement

    I need to estimate mechanical seal flow requirements for a project's worth of centrifugal pumps, so that, with an applied margin, I can specify seal water circulation pumps, pumping tanks, line sizes, etc., etc.. I have some estimates from a previous plant plant design, but that plant is about...
  5. Leclerc

    Kettle Boiler: shellside velocity criterion

    Dear All, There is a process condenser which generates steam in a kettle-type boiler. What should the (average)vertical velocity of generated steam be so that a normally accepted level of disentrainment is achieved? What should the velocity be for flowsheet, and what should be the maximum...
  6. Leclerc

    Flammability limits: acids which associate in the vapour phase.

    When flammability limits for, for example, acetic acid, are published, they are, as usual, quoted as % v/v. I assume that the v/v approach is used because it is dilution which limits flammability by failing to sustain burning, rather than something based upon stoichiometric considerations. I...
  7. Leclerc

    Large Pipe: When to change to two smaller ones.

    Current plant design is a single 60"NB inert offgas line (mainly nitrogen and water vapour as a result of desuperheating to an operating pressure/temperature of 1.1 bara/ 50 deg.C) to a single branch inlet to the final offgas scrubber (caustic solution) before discharge to atmosphere. Design...
  8. Leclerc

    Depressuring Valves to avoid BLEVE during a Fire

    What should be the air fail action for depressuring valves installed, or nominated, to avoid a BLEVE when fire surrounds a pressure vessel? If air fail closed, and if fire also causes damage to air system then depressuring will not happen and BLEVE possible. If air fail open, then vessel...
  9. Leclerc

    conditional formatting of autoshapes

    Is it possible to change the colour of an autoshape or fill of an autoshape, depending upon the value in another cell?
  10. Leclerc

    how high is high impedance

    Ignoramus is setting out to dabble in electronics. Comes up against a requirement that headphones (for a certain application) need to be "high impedance". Has no idea what constitutes high impedance. Can anyone help?
  11. Leclerc

    hydraulic head of a bubbly mixture

    This is not homework. A. would argue that the hydraulic head at a point in a bubbly mixture is equivalent to the average density x g x height of liquid surface above the point. Period. B.(Leclerc)would respond that he is not so sure. He would argue the hydraulic head at a point in a bubbly...
  12. Leclerc

    Acid-Base Heat of Neutralization

    I know that the heat of neutralization of a strong acid and strong base is -57.7 kJ/gmole. What I need is a good web reference to back this up. I think the essential equation is H+ + OH- = H2O + heat of neutralization. I can find deltaHfo(H2O, liquid, 20 deg.C) =-68.315 kcal/mole, and...
  13. Leclerc

    basic circuit convention

    Hi! No circuit engineer, me - as you will discover. I need to understand some basic circuit conventions upon which I may build, and I would be grateful if someone could answer the following questions. 1. Is it convention to draw circuits with the V0 (-ve) connector at the bottom of the...
  14. Leclerc

    location of add-in basis moved

    I am not experienced in excel. Please bear with me whilst I describe problem in my own idiosyncratic way. I have a number of excel files which have had the add-in for properties of water and steam, www.cheresources.com/iapwsif97.shtml. Unfortunately, the source file for this add-in...
  15. Leclerc

    Diesel Storage Tank: Vaporisation rate and Fire Relief

    API 2000 enables one to calculate heat input to an atmospheric storage tank. If one has the boiling point at atmospheric pressure and the latent heat of the tank contents at that temperature, then one could calculate the vapour released and size the emergency vent. This is fine for liquids of...
  16. Leclerc

    diesel stoarge tank needs inert gas?

    I don't think that No2 diesel,of a specification fine enough for an emergency electrical generator, requires an inert blanket when stored at ambient temperature. However, I would like other peoples views on this, and some information on custom and practice. My reasoning: From typical data...
  17. Leclerc

    Compressed Hydrogen Receiver

    Our process reaction uses a continuous stream of hydrogen, compressed to 90 barg from an OSBL source. We need to install a 20 m3 compressed hydrogen receiver between the compressor and the reactor. In the first instance, where should I go to obtain a list of design points/ issues concerned with...
  18. Leclerc

    Reduce Gas Spikes to Flare when Pigging

    We are investigating installing an isolation device in Flareheader to aid gas recovery. Isolation device is likely to be an in-line buckling pin, with a pressure control valve in a by-pass for upstream pressure control. The control valve would be sized for the "normal abnormal" flows...
  19. Leclerc

    2-phase flow thro' orifice: any comments?

    I would appreciate any polite comments on what I am doing. My scratch-built method for calculating 2-phase flow through a given orifice brought about by a given differential pressure consists of the following steps: 1. Determine the flash of a multicomponent system.Calculate the ratio of gas...
  20. Leclerc

    Meaning of "pptb"

    In the context of sand in Oil, what does the abbreviation "pptb" mean? thanks

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