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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

    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...
  3. 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...
  4. 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...
  5. 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...
  6. 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...
  7. 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!
  8. 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...
  9. 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...
  10. 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...
  11. Trond

    Conversion PPM(wt), PPM(vol), g/m3 (gas phase)

    Hi there all, We are doing frequent measurements of contaminants like H2S, Hg, As in our gas streams, as well as for the concentration of same in air around out plant. Unfortunately, units used to specify limits, readings from meters, etc are rarely consistent, and in many cases open to...
  12. Trond

    Dangers with cigarette lighters...

    Hi all, My company is considering banning lighters on their offshore oil & gas installations, and make smokers to use matches instead. Smoking is, and has always been (naturally) restricted to living quarters (and in the case of our FSO, control room). Playing the devil's advocate here, my...
  13. Trond

    Another Mercury Question

    Mercury again, I just tried to drain mercury from a compressor gas scrubber (IP pressure, about 800 psi operating pressure). This vessel had been out of service for about a week, depressurised, but not drained. The vessel has a liquid outlet from the side, and a drain line at the bottom. My...
  14. Trond

    Disposal of Mercury

    I am working with an oil company, and we have a problem with Mercury contamination of our products. We have a waste disposal specialist handling Mercury contaminated sludge, sand, pure Mercury, etc. I was told that this sludge, etc is being treated by incinerating it. In my opinion, this just...
  15. Trond

    H2S Levels in Natural Gas

    Hi everyone, We have offshore oil & gas platforms with some wells producing H2S. Recently it was found that one of our wells had reached 600 PPM H2S. We do not have H2S detectors on the platforms, and the well was therefore shut down. This to me seems a bit excessive. Whereas 600 PPM H2S...

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