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  1. RotaryG

    Highest Inlet Pressure for an Expander

    What is the highest inlet pressure for an rotary expander working on air you know of and what were the flow rates?
  2. RotaryG

    Gas Turbine compliance to Standard

    2012tech, Unlike governing, Trip is a safety function. For turbines, trip function is provided by an independant system.Usually trip speed is set at about 105% of MCS. MCS is the "Maximum Continous Speed". MCS is at least 105% of the rated speed. Operation above 105% is not menat to be...
  3. RotaryG

    Compressor capacity Control Method

    Your question can be a good title for a book! Could you please be more specific as to the nature of the application and brief process specification for the compressor so that a more meaningful response can be given? It also helps if you can advise the forum the extent of your familiarity with...
  4. RotaryG

    Mechnical Sealing on CO2 Integral Gear Compressor

    planck121, CO2 is heavier than air and you are locating the compressors in a building. You need to provide best sealing money can buy.
  5. RotaryG

    2 phase LNG expander predictability on scaling up

    giancarlosavini, Perhaps you should start with ASME PTC 10...
  6. RotaryG

    Lube oil system reliability-Kindly guide

    Raju, It appears that you are not in the design phase but almost in commissioning phase! Congratulations. The definition of the preferred configuration of the oil system starts with data sheets and material requisitions (or whatever you call in your organisation). Since you have gone past that...
  7. RotaryG

    Suppliers of FinFans for Aircooled Heat Exchangers

    Thank you all folks. Some pretty good leads there. Looking for API 661 compliance. So, the list gets a bit narrowed. Have any of you performed any compariosn of the designs of all these sources? Any pearls of wisdom?
  8. RotaryG

    Design Validation Procedure

    Assuming the "design validation" is for some kind of new ways of doing a business you may refer to DNV RP A203. It is a generic procedure (ie lot of words) to which you may have to add your design specific twists. Questions you may have to ask yourself are whether you need any mathematical...
  9. RotaryG

    Compressor aftercooler cleanliness criteria

    Everyone has their own standards. Some people use a 100 micron nominal mesh in the temporary strainer at the suction of the compressor. So, that should give you an idea of the cleanliness required in the aftercooler (The compressor recycle line is, usually, connected at the downstream of the...
  10. RotaryG

    if turbine trips

    If the stop/ratio valve is passing... I would imagine fuel gas leaking in to the combustors and in to the exhaust. That is the reason why prior to ignition, the turbine undergoes a purge cycle for a duration propotional to the volume in the exhaust. If the valve is leaking immedaitely after a...
  11. RotaryG

    Suppliers of FinFans for Aircooled Heat Exchangers

    Anyone has direct experience with any of the fin fan manufacturers? No need to name them unless one wants to. But, appreciate knowing the goods to dream for and bads to watch for.. Both ID and FD fans are of interest. What is the latest in the technology? Thanks in advance...
  12. RotaryG

    What is the difference beween a Blower & Compressor

    Zdas04.... What you have are compressors! You deserve and hence shall ask for an immediate pay rise!
  13. RotaryG

    Air compressor flow rate

    Apoogies for butting in late... If Ctran "intended" to buy a "223ACFM at 125 psig" compressor, then Ctran should have noticed (as a responsible purchasing engineer) that the motor rating offered bt the compressor vendor is too low. He then should have corrected the misunderstanding. If Ctran...
  14. RotaryG

    What is the difference beween a Blower & Compressor

    I tend to agree that there is no difference. Some people have used an arbitrary pressure ratio to define what is what. However, I would suggest that a blower is a compressor whose final outlet is to atmosphere! A compressor is a blower whose final outlet is - some way - enclosed...!! Going by...
  15. RotaryG

    Gas Plant Lessons Learnt

    I am trying to collate BIG Lessons Learnt by the forum members as regards the operation of a gas processing plant during its first year of operation. The collated information would be useful in addressing what kind of name plate percentage we can obtain during the first year.. Example of BIG...
  16. RotaryG

    Rotor System Inertia

    For a standalone captive power plant (no public grid nearby) how important is the polar moment of inertia of the rotor system important for a 200 MW gas turbine power plant? Would industrial heavy duty gas turbine provides better inertia than aircraft derivative gas turbine? Or can we have...
  17. RotaryG

    Air Cooled Heat Exchanger -Fan Speed Control

    Maddocks is right. We need DP to push the stuff round and round. However, in a well engineered system, a situation that warrants artificial creation of pressure in the condenser shall not arise. If that is the case, then the condenser is bigger than needed. Ie, we engineers have wasted money...
  18. RotaryG

    MAWP and design pressure

    I would like to interpret that the Design Pressure is the maximum pressure to which the System is designed to and safety features are incorporated to ensure that the operating pressure does not exceed the Design Pressure. The MAWP relates just to the peressure vessel or a compressor casing as...
  19. RotaryG

    Air Cooled Heat Exchanger -Fan Speed Control

    It is not clear why speed control of the air cooler fans is required in this service. Once money is invested in the air cooler surface area, does it not make sense in using the exchanger as efficently as possible? Better is the cooling, lower is the condensing pressure. Lower is the condensing...
  20. RotaryG

    Project - "value engineering" references to cut project costs

    Value Engineering (VE) is collecting ideas from 'semi-knowledgeable' people. If we have a value engineering session with ‘experts’ and/or people intimately connected with the project, we get to do the things what they did/ preached earlier. At the same time, we can not have effective VE session...

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