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  • Users: Ferex
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  1. Ferex

    Clarification on Brayton Cycle

    Many thanks, you gave me answers for my question. Sadly I understand that I have a big lack of knowledge, things studied and then forgotten... I will try to fill these voids.
  2. Ferex

    Clarification on Brayton Cycle

    Ok, I keep reasoning, fuel entrance and consequent burning give the fluid great energy: how this energy is stored? what parameter does this energy change? It's not pressure because it remains constant, is it velocity? I am not sure because the enlargement of the cross-section slows down the...
  3. Ferex

    Clarification on Brayton Cycle

    Thanks guys... so do you confirm that during combustion the chamber cross-section area increases? Link very interesting, I read brayton cycle on wikipedia but not the combustor... On that link cross-section area seems to reduce after burning.
  4. Ferex

    Clarification on Brayton Cycle

    Hi everybody, my question is very simple, I think but I can't have a point on it: in brayton cycle there's the isobar step, during the combustion process... everywhere I read that this step is isobar, but I am guessing how can it be isobar if temperature of the gas rises because of combustion...
  5. Ferex

    Pressure variation in a vent pipe

    I only need an answer to my final post, please tell me if I am right or not.
  6. Ferex

    Pressure variation in a vent pipe

    Many thanks for the answers, I need a comment on this sentence "then it arrives at the outlet section and it suddenly goes from 5 - (all the p.drops)to 1 atm. All the pressure energy transforms in velocity." that I wrote inmy post. Is it right??
  7. Ferex

    Pressure variation in a vent pipe

    Getting into the details of an example, let's say that I have after valve discharge a straight pipe, an elbow and than it goes up vertical to atmosphere. Let's say valve discharges at 500 KPa (5 ATM). If I understood well, pressure in the vent pipe goes from 5 atm to 1 atm. There's the elbow...
  8. Ferex

    Pressure variation in a vent pipe

    Hi everybody, how does pressure varies in the vent pipe connected to a PSV? I think it should go from the opening pressure of the valve to 1 ATM or 100 KPa (atmospheric pressure). If I am right is this variation linear during the lenght of the pipe? Does it happen suddenly at the open side of...
  9. Ferex

    Allowable changes in the presence of SIF (SUS case)

    Hi, I perform stress calculations using Coade Caesar II. I noticed that in sustained cases allowables undergo variations (they diminish) at the points with SIF (stress intensification factor). Though I can understand why I cannot find a B31.3 formula or paragraph that justifies this behaviour...
  10. Ferex

    materials for water lines

    Many thanks waterexpert...
  11. Ferex

    materials for water lines

    Hi, I have noticed that water lines in the oil plant I am surveying have valves and sometimes lines are made of various materials, above all bronze and cast iron, sometimes steel. Could you explain how to choose one or another material and the criterions? Lines are cooling water, raw water...
  12. Ferex

    Relief valves

    Great answers, many thanks
  13. Ferex

    Relief valves

    Hi everybody, I found that in most cases these kind of valves have an outlet with littler flange rating and bigger diameter than the inlet, I ask you why. Maybe the rating is for the pressure reduction but I really can't explain the bigger diameter. Many thanks
  14. Ferex

    What happens to a fluid going from one diameter to a littler one?

    If a fluid changes diameter passing through a reducer, let's say from 10" to 8" what happens in terms or pressure? Excuse me for the silly question but in the office someone made doubts arise.
  15. Ferex

    Why reducers in the by-passes systems

    Yes it's a technical reason strictly linked to economical reasons. I meant this... Bye and thanks again
  16. Ferex

    Why reducers in the by-passes systems

    This forum is marvellous, I had my answer in 7 minutes!!! Thank you BigInch, I thought there was some fluidodynamical reason
  17. Ferex

    Why reducers in the by-passes systems

    As I wrote in the subject I would like to know what's the function of reducers in a by-pass, I attach a little picture to clarify things, I hope you will answer me, many thanks.
  18. Ferex

    The art of Laser surveying

    Many thanks, I already took a reading on the article Gator suggested. BillBirch, I said it is an art because I have to represent reality, and many times it's difficult to represent it on a drawing, many times, after 30 years the plant is very different from how it was at the beginning, (luckily...
  19. Ferex

    The art of Laser surveying

    But what if I talk about structures... If I take the distance on the basements I think that temperature and load doesn't matter, I think it's a mistake during the construction phase, should I care about it or not?
  20. Ferex

    The art of Laser surveying

    Ok, thanks, in this case the problems arise when the steel is a little bit bent, usually I give the distance at the basements, I never surveyed off-shore but for pipe-rack steel columns I find distances are never the same as designed, I can find 4005, 4003, 4012, 3088, as an end user do you want...

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