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  1. monaco8774

    glycol seperation

    Usually these systems have a positive displacement pump to bring pressure back to contactor, then as long as you are operating the contactor sufficiently below the maximum discharge pressure of the pump you could use a hydrocylclone, however problem is you would then have to design the...
  2. monaco8774

    Expanding Gate Valves - Bad Experiences

    Sorry about delay in reply have been on a location with no access to internet. Pressures circa 270 bar(g) Temperatures around 60Celsius Fluid is hydrocarbon gas with no condensate downstream of glycol contactor so very low water dew point Some solids in line due to internal corrosion in yard...
  3. monaco8774

    Expanding Gate Valves - Bad Experiences

    I am presently working on a facility where they have a large number of valves from an italian manufacturer (who shall remain nameless). Apart from problems with real variable stiffness from one valve to another we have a major issue with the double seated expanding gate valves. These are used in...
  4. monaco8774

    Liquid Entrainment/Carryover from Inlet Separator

    ivegot gas This problem is very common. You have carryover and you want to prove and quantify it, heres a run down on ways to do it that I've used in the past starting from the cheapest to the most expensive: 1) Open a sample connection on gas outlet through a filter or rag to a suitable safe...
  5. monaco8774

    glycol seperation

    Problem is what do you do with the reject liquids, cant just throw it away without increasing your operating costs.
  6. monaco8774

    Gas / glycol temperature control

    Actually the reason for cooling the Gas to within 5 to 10 degrees of the inlet gas before putting it in is usually put down to preventing foaming and high TEG losses. Not sure wether this is a myth or not but nearly all the dehydration units I worked on had a cooler. If you use a gas TEG...
  7. monaco8774

    What is 'Bubble Tight Shutoff' ?

    Bubble tight means different things to different people, if your buying a valve from these guys specify the test you want to conform to there are several classifications that are used for valve tests as you have mentioned. Go back and have them confirm they conform to your requirements. That...
  8. monaco8774

    Flowrate

    I dont know if this answers your question but you have to do an iterative calculation at the branch. The pressure drop through each branch is identical if they either rejoin or they exit to the same pressure. What you do is guess flow in 6" branch this gives you the flow in 8" (total flow 670...
  9. monaco8774

    Galvanised Carbon steel internal material

    Apologies if this is an obvious question, but I have a problem on an FPSO where part of the sea water pipework is made from galvanised carbon steel and the exchangers fed by the sewater are plugging up regularly with a fine material that seems metallic. The other sea water systems are made from...
  10. monaco8774

    Causes to Low PH in Glycol Systems

    CO2 or H2S dissolve readily in glycol reducing the pH,also glycols oxidise readily froming corrosive organic acids. For the first two you can only use pH control chemicals for the second you should make sure that any spent TEG is not returned to the system and that the surge tank and reboiler...
  11. monaco8774

    Compressor Tandem Dry gas Seal : Failure of inboard and outboard seal

    By amazing coincidence we were recently asked to do the same thing based on a safety alert on our demag compressors, it turns out the alert was raised after a tandem seal failure on a compressor in a factory in Germany. However the seals were different materials (tungsten Carbide) to ours and...
  12. monaco8774

    4 offset Butterfly Valves ( Quadruple Eccentric )

    Zwick a german manufacturer does tripple offset, Bray does double offset I didnt know a quadruple offset existed
  13. monaco8774

    Lube oil contamination - wet gas compressor

    I have had a similar issue before on oil wetted screw compressors on hydrocarbon gas service, if the gas is fairly heavy as it cools from the upstream vessel gas outlet to the compressor either in normal operation or especially after a shutdown, if left pressurised, liquid hydrocarbons will...
  14. monaco8774

    H2S Liquid Scavenging system

    All the scavenger chemicals work by reacting with the H2S to form an insoluble scale i.e. the byproduct is solids. Is there some reason why you have to filter all this byproduct out because at 0.3 micron filtration your going to go through filters at some rate. In fact you are filtering out...
  15. monaco8774

    17-4PH compressor impellers

    We operate a compressor in a field with 400ppm H2S and the we changed teh inlet guide vanes and first stage impellers to 17-4pH, actually dramatically improved the errosion resistance as we were forming sulphide at the inlet
  16. monaco8774

    Interstage pressure problems

    Is this compressor taking its gas from a subsea reservoir, on start up from a production well sometimes the production comes in cold initially and this means you klnock out more liquids upstream and have a lighter mol weight for the gas untill main production comes on, also sometimes an...
  17. monaco8774

    material resistance

    We have plenty of stainless 316 at 2500 lbs but the problem is not pressure it is the partial pressure of components that can be corrosive in the fluid you have in the valve, what is the service ?
  18. monaco8774

    Potential Problem of Direct Fired Heater for Crude Oil

    Only an opinion that may help I used to work for a vendor that supplied both indirect and direct fired heaters We would turn down bids for direct firing versus combustible fluids because if you get a pinhole leak you end up with an unknown inventory of flamable liquids direct on your burner...
  19. monaco8774

    Restriction orifice under special conditions

    Lavalos I am not sure of your aplication and may be way off the mark as my experience is oil and gas offshore, but generally if you are talking depressurisation having to happen within a certain time period from a vessel usually the sizing basis is gaseous phase only, if its from a flowline or...
  20. monaco8774

    Two-Phase Flow meter

    ASKME I work in offshore oil and gas and we do have installed on some facilities what are clainmed to be multiphase meters. Two that I know of but have no experience was South scott field (paper written OTC 8549) and Gulfaks (paper written OTC 8563) these both came out ion 1997 so quite old...

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