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  • Users: Trond
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  1. Trond

    Hot Oil vs Glycol/water as heating medium

    I tried posting this in the Chemical Plant Design forum, but perhaps this is a better place. Apologies for cross-posting. My question was as follows: We are looking at a new offshore oil & gas facility where we want to install a heating medium system. The heat will come from several WHRU on...
  2. Trond

    Design problem

    If you want to achieve 99% C3+ in your product stream, you will most likely require some serious distillation to get rid of your C1&2s. I very much doubt chilling alone will get you that far.
  3. Trond

    Hot Oil vs Glycol/water as heating medium

    Hi StoneCold, thanks for taking the time. The system (if glycol/water) will indeed have to pressurized, but at a much higher pressure than what would be the case for a hot oil system. My dilemma here is that I personally think a HO system would be better in terms of simplicity, lifetime...
  4. Trond

    Hot Oil vs Glycol/water as heating medium

    Thanks for that swift reply, moltenmetal. Very much appreciated! The return temperature will be at least 30°C (86°F), so I don't anticipate any viscosity issues here.
  5. Trond

    Hot Oil vs Glycol/water as heating medium

    Hi all, We are looking at a new offshore oil & gas facility where we want to install a heating medium system. The heat will come from several WHRU on gas turbin outlets. Operating temperature of the system will be around 170°C (340°F), and the proposal is to go for a glycol/water mixture. I...
  6. Trond

    Orifice meter - wrong installation

    Thanks all! It is (unfortunately) a fiscal meter, although the measurement is only for injection gas, for which the company is obliged (and previously seemed to fail) to provide a minimum amount of throughput per day. Indications are that measurement has been off by about 15-20%, but it...
  7. Trond

    Orifice meter - wrong installation

    We have an gas orifice meter that was wrongly installed, with the conical opening facing the wrong way. Unfortunately there are was external indication of flow direction, and assurances had been given that it was correctly installed - something that could probably justify a separate thread on...
  8. Trond

    Air coolers vs water coolers on offshore installations

    What are the criteria for selecting the types of coolers for offshore oil & gas facilities? Am I correct in assuming that the advantages of air coolers are: More reliable Less maintenance intensive Shorter lead times What about overall weight/cost conpared to a sea water cooled system? The...
  9. Trond

    Formula for calculating heat loss from single pipe - cold spot

    Hi, I am trying to calculate heat loss from a pipeline in a forced convection (sea current) scenario. I have been going through several heat transfer textbooks, but all I can find are formulas for pipe bundles (for heat exchangers). A bit of background info: In this particular case, we have...
  10. Trond

    Fire Water Pump Start/Deluge Valve Opening Sequence

    Thanks guys, the problem is that the deluge demand exceeds the pump capacity while the pumps are starting up, say for 15-20 seconds or so. During this period, the deluge valve will be wide open, but the two pumps required have still not reached full speed. The deluge valve opening causes a...
  11. Trond

    Fire Water Pump Start/Deluge Valve Opening Sequence

    Hi all, I hope someone out there could help me with this problem. We have an offshore installation with a total of 5 fire water pumps supplying the ring main. System is pressurized with a single jockey pump. Max total deluge load in a single fire zone requires two pumps to start up to meet...
  12. Trond

    Low BTU flaring

    Cheers, David - a great site you've got there, which I have now bookmarked for future reference!
  13. Trond

    Low BTU flaring

    Thanks a lot, guys - that was exactly the info I needed![thumbsup2]
  14. Trond

    Low BTU flaring

    Is there an easy way to calculate how high a N2 (or CO2) concentration one may have in a gas stream before flaring becomes impossible? Calculating calorific value is easy enough, but it does not tell me when I reach the LEL. Cheers!
  15. Trond

    Recip AND centrifugal pumps together

    Dear all, I just posted this before leaving work on Friday afternoon, and I am overwhelmed by the response - don't you people take weekends off? :-) Anyway, to clarify somewhat - the system in question is a water injection one, and the two existing WI systems (two recip & two centrifugal...
  16. Trond

    Recip AND centrifugal pumps together

    Hi all, Connecting centrifugal and reciprocating pumps to the same discharge manifold - what would be the concerns? Assuming same discharge pressures, check valves in place, pressure relief valves provided, etc. Operating pressure around 150 bar (water injection). It was just suggested by...
  17. Trond

    MInimum flow requirement of Submerged Pump

    Thanks for that input, Steve, The sump tank is connecteed to a flare system which is permanenlty purged, so explosion hazard due to vapourisation is not really a concern. I am still awaiting a reply from the vendor (via out client), but suspect that operating the pump against a blocked outlet...
  18. Trond

    MInimum flow requirement of Submerged Pump

    Hi all, We are designing a plant where one piece of equipment is a sump tank submerged pump. The liquid pumped is hydrocarbon liquids, potentially as low as -20 to -30°C. I have just been informed that there is a minimum flow requirement for this pump, and the client has requested minimum...
  19. Trond

    Separator internal anti-foam spraying

    Hi all, we are doing a detailed design of a oil & gas production platform for a client. The oil separation takes place in 3 stages, a pretty conventional set-up. We have provided anti-foam injection points (quills) upstream of the inlet to the first two separators, but the client has...
  20. Trond

    H2S Levels in Natural Gas

    Dear Gordon, first of all, the problem was not ignored, the well has been shut in and is no longer in production. I was asked by a poster if the platform was in US waters, and replied that it was located in SE-Asia. I am not too sure what you are insinuating, but you seem to be making way too...

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