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  • Users: Iradah
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  1. Iradah

    Does a large PSV adjust its opening to flow only the inlet feed to the vessel?

    Hello, I was wondering how the PSV behaves when it reaches the set point and opens. for a PSV sized for a blocked outlet relief load, it will be sized for the flow rate into the vessel. After some years, the production might be less and the required relief load will be less, however, the PSV...
  2. Iradah

    Who owns the operating procedures and prepare them?

    Hello all, I need to know what the practice is in oil and gas plants operation with respect to writing operating procedures. Who owns the operating procedures for the plant? Who writes them? Who approves them? what are the levels of approval the procedure go through? What is the exact role of...
  3. Iradah

    Isolating flare stack while the plant is depressurizing

    Hello all, I just thought I can share with you an event happened at our site. We had a black out at which the ESD was initiated and all blow down valves open to flare. There are two flare stacks at the plant, one of the operators wanted to reduce the loss to flare so he isolated one of the...
  4. Iradah

    What is the effect of choked flow in flare header system?

    Hello, I need your feedback about choked flow in flare headers. I am reading a study on our flare header system at the plant made in 2009. There is a PSV that has a 12” line going into a 16” pipe then into 24” header. The study says that there will be choked flow at the end of the 16” header...
  5. Iradah

    Evaporating liquid C4 in sales gas stream

    Hello all, I am thinking of mixing a 1,600 bbls of liquid C4 stream with 40 mmscfd natural gas stream. They will meet in 16" header and flow for ~ 50 meters before entering an amine plant. the stream should be totally in the gas phase before it enters the amine plant as it will go to the...
  6. Iradah

    Efficiency reduction with removing some tubes from the heat exchanger

    Hello all, I need to remove the maximum possible number of tubes from a shell and tubes heat exchanger without affecting its efficiency, is there a way to know the effect on its efficiency without going into detailed design calculations?
  7. Iradah

    Commissioning LPG pipeline

    Hello all, With reference to my earlier thread: http://www.eng-tips.com/viewthread.cfm?qid=354614 as a result of the stuck pig in C4 pipeline, another pipeline is to be used for C4. This line is currently used for fuel gas. Can you please help me on how to commission C4 pipeline that has fuel...
  8. Iradah

    Rotation of turboexpander with no lubrication

    Hello all, We have a turbo expander of a maximum speed of 18500 rpm. We S/D the unit for some work. The inlet XV was passing and the unit was running at 2000 rpm with no Lube Oil for ~ 8 hrs. What do you think is the consequence of this rotation with no lubrication? We currently are facing...
  9. Iradah

    Stuck Pig/Chocked flow in liquid Butane pipeline

    Hello all, I need your urgent help on this. We got a stuck pig in our 6" Butane transferring pipeline of 30 km length. The pig is stuck and blocking the line but allowing for our daily production flow to pass through the very small areas around it (the pig is not 100% sealing the diameter of...
  10. Iradah

    Gas leak through a hole in the pipeline

    Hello all, I need to calculate the flow rate of gas leak from a pipeline coming from gas well where some water and condensate are produced also. The leak is from 130 psig pipeline pressure to the atmoshpere. What is tbe best equation to use? Thank you..
  11. Iradah

    Efficiency of overdesigned heat exchangers

    Hello all, I am building a simulation model for our LPG plant. I was assuming 15 oF as delta T approach for the heat exchangers, but then I realized that these heat exchangers are now handling around 30% of the original design flow. So are 15 oF still valid, I think that the heat exchangers...
  12. Iradah

    turbo-expander performance curves

    Hello all, I am trying to predict a new turbo-expander performance using supplier performance curves. expander curve showed a certian power produced for a given flow rate and speed. using the same speed and power on the compressor curve to see what flow rate is needed, I found that the flow...
  13. Iradah

    effect of liquid to expander inlet

    Hello all, What is the effect of having liquid carry over to the expander with the inlet gas stream, can this damage the expander (guide vanes?)
  14. Iradah

    Heat exchanger configuration leading to temperature cross??

    Hello all, I have a question regarding lube oil heat exchanger designed for us by one of the companies. we noticed after commissioning the system that the hot oil is not getting cooled. we think that there is no enough cooling water flow into the heat exchanger and working on increasing it...
  15. Iradah

    Breaking strong oil in water emulsion

    Hello all, I am seeking your advice on the following: The inlet separators are now oversized due to lower plant inlet, I thought that this should be helping in the emulsion as it provides more residence time, however, when one of the inlet separators was isolated for a while, other vessels...
  16. Iradah

    Difference between FBD valve Whisper Trim III A1 and A3?

    Hello all, I am trying to understand what the difference is between the A1 and A3 for Fisher FBD valves of Whisper trim III type, can you advise.. Thank you.
  17. Iradah

    Hello all, we are replacing an e

    Hello all, we are replacing an existing turboexpander-compressor with new smaller size one due to lower plant inlet flow. the capacity of the compressor has changed from 345 mmscfd at normal operations to 115 mmscfd. with this new expander-compressor, the need for recycle flow on the compressor...
  18. Iradah

    Q: Fiscal meter accuracy change with added tie-ins

    Hello all, I need your consultation regarding the accuracy of a metering skid. There is a proposal to connect one stream of gas at the outlet header of a metering skid that has three runs. So now there will be two streams: one that enters the meter and gets measured and one that joins at the...
  19. Iradah

    What is the effect of the plate material on the measurement?

    Hello all, What is the effect of replacing an orifice plate with another plate of different material? The vendor said that the material A216 is not avialable and instead he will use stainless steel material. Thanks in advance.
  20. Iradah

    Effect of passing seals on orifice plate reading?

    Hello, What is the effect of having the seal around the orifice plate passing? we recieved an orifice plate with double volcanized seal around it. the seal was rectangular so our instrument technician tried to make it round and then installed it? what if the seal after this modification is...

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