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  1. MeOHguy

    Calculating time to heat a pipe

    I have tried it first with just a bare pipe, but the result was still the same. So, I wonder where I did wrong in solving the integral function. From the left side of the equation, hi x Ai x (Ti - Tw), when it is computed for a period of 10 minutes, the temperature increase to heat that 7 ton...
  2. MeOHguy

    2 phase flow in PSV?

    Thanks a lot for your reply. Yes, we have already installed a shutdown valve at the outlet of the G/L separator. However, from the perspective of Safety Integrity Level, this single shutdown valve is not sufficient to mitigate the risk. A PSV is required in this case, and that is when the...
  3. MeOHguy

    Calculating time to heat a pipe

    Thanks LittleInch for your feedback. What is NASA of steam? Actually, I could only imagine that the moment that the quench water valve fails, the temperature of the steam would increase and there is an increase heat transfer rate, which is covered by the term hi x Ai x (Ti - Tw). During...
  4. MeOHguy

    2 phase flow in PSV?

    Dear All, One of the PSVs in the plant is installed on an expansion vessel, whereby high pressure liquid is expanded from 70 bar.g to 5 bar.g (as attached). The PSV is sized for failure open of the level control valve in the upstream gas-liquid separator. The inlet nozzle is extended below the...
  5. MeOHguy

    Calculating time to heat a pipe

    Dear All, I am trying to calculate the time to heat a steam pipe from initial operating temperature to an elevated temperature due to failure of a letdown quench station. I have started from the general heat transfer equations (as attached) and I end up with a ridiculously fast time, in less...

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