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  1. CloudNine1

    Pressure relief valve calculations

    Thanks.
  2. CloudNine1

    Pressure relief valve calculations

    @RVAmeche, Thanks for the elaborated answer. Unfortunately I don't think I fully understand 2. and 3. :( Regarding 2: The backpressure you mentioned, is the "pressure downstream of the relief device, that includes the constant superimposed backpressure and the built-up backpressure due to the...
  3. CloudNine1

    Pressure relief valve calculations

    Hi folks, I'm trying to calculate the required size of a pressure relief valve I will use on a theoretical double pipe heat exchanger. I've came across these formulas: But there are a few things I don't really understand there: 1. First and foremost, I'm having a hard time understanding...
  4. CloudNine1

    Sensitivity check for heat exchanger

    @IRstuff, thanks for the answer. The water's temperature is rising from 25C to 340C. The water is flowing extremely slow (like 0.001 m/s - it is an external demand given in the exercise) and the oil is flowing quite fast - I guess it is also what makes the system so sensitive.
  5. CloudNine1

    Sensitivity check for heat exchanger

    Hi folks, As part of a theoretical exercise, I'm designing a double pipe, concentric heat exchanger. The inner pipe carries water and the outer pipe carries hot thermal oil that heats the water up to a certain temperature. There are a lot of variables in the problem (length of the pipes, flow...
  6. CloudNine1

    Butt-weld thickness

    Hi guys, I would like to calculate the thickness (and the other parameters needed) of butt weld that connects between a pipe and a weld neck flange: I couldn't find any thumb rule, or even better: an analytic formula (which involves working pressure, temperature, etc) that allows calculating...
  7. CloudNine1

    Back pressure valve (BPV) functions

    Yes I think it's more clear now. Thank you very much!
  8. CloudNine1

    Back pressure valve (BPV) functions

    Thank you very much for the elaborated answer. I'm afraid I'm still confused... As far as I understand, BPV is not equal to pressure reducer. A BPV is a device used to accurately control the pressure of a system, through opening just as much as is needed to return to normal pressure levels. The...
  9. CloudNine1

    Back pressure valve (BPV) functions

    Hi guys, I read on the internet that BPVs not only control the upstream pressure in the system, but can also work as pressure reducers. How is it possible? For instance, if I want to hold pressure of 200 bar, I will use a BPV, but from what I understand, if I want to reduce the pressure after...
  10. CloudNine1

    Insulation heat loss from a pipe

    I calculated it, and tripled checked my calculations. I'm just looking for a reassurance that my calculations are realistic.
  11. CloudNine1

    Insulation heat loss from a pipe

    Hi folks, I'm looking for a graph like this one: But I need it to be for a specific insulation thickness (0.1016 m (4") thickness) and for a higher temperature difference (around 300 celsius degrees difference) Could you help me with finding something like that? I couldn't find anything...
  12. CloudNine1

    Corrosion allowance factor

    Dhurjati Sen - I have the section you mentioned, but I couldn't find there any reference to HTL process, nor a tip on how to estimate this factor. Can you show me where you saw this statement there? LittleInch - I appreciate your elaborated answer. I don't know the chloride content, I guess...
  13. CloudNine1

    Corrosion allowance factor

    Is there anything similar, but for free? It'll take me a month to order such thing, and I can't progress without this value..
  14. CloudNine1

    Corrosion allowance factor

    Hi all, I'm working on a project that comprises of building a heat exchanger. The fluid inside the heat exchanger is sea water (with some algae, but let's ignore that for our matter) at 350 celsius degrees and 250 bar (I'm trying to perform HTL - hydrothermal liquefaction, hence the high...

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