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  1. tsenthil

    Large Size Solid Tungsten Carbide Ball Valves

    Recently i came across a requirement 16 Inch to 24 Inch ANSI 600 Class Ball Valves with Solid Tungsten Carbide trims. All the quotes i have received is with Tungsten Carbide Coating and not solid Tungsten carbide. The consultant is firm on his requirement (ie Solid Tungsten Carbide). 1. Is it...
  2. tsenthil

    Ball Valves with Solid Tungsten Carbide Trim

    Recently i came across a requirement 16 Inch to 24 Inch ANSI 600 Class Ball Valves with Solid Tungsten Carbide trims. All the quotes i have received is with Tungsten Carbide Coating and not solid Tungsten carbide. The consultant is firm on his requirement (ie Solid Tungsten Carbide). 1. Is it...
  3. tsenthil

    Valve Stroking Speed

    Dear Gerhard/Jim I came across the enclosed calculation for calculating Stroking speed for linear valves.. will we use this for Rotary valves?http://files.engineering.com/getfile.aspx?folder=87b6307e-c50c-443e-9b2a-eb12a64abe1c&file=SG_Stroking_Time.xls
  4. tsenthil

    Valve Stroking Speed

    Can anyone help how to determine the Solenoid/Air Filetr Regulator Cv required for attaining stroking speed in a Rotary Valve I have details like this Actuator Volumetic displacement - 165 litres Ball Valve closing time reqd - 15 Secs Ball Valve Opening time reqd - 15 Secs is there any...
  5. tsenthil

    Cryogenic Globe Valve Flow Direction

    I2I: Noise in Flashing duty.. Is there is anyway to find Noise produced in Flashing application? I normally made some correction in Vapor pressure to make the application cavitating and find the noise and presume noise produced in Flashing is less than Cavitating service. Most of the case i end...
  6. tsenthil

    valve differential pressure?

    HI Jim, Thanks for the post.. Can you explain how additional flow will happen in a choked condition by opening the valve? Thanks Senthil
  7. tsenthil

    Cryogenic Globe Valve Flow Direction

    Now i think that flow direction dont have any significance in flashing application. What we need is only a Hardened Trim to counter erosion due to Flashing. May be an Angle valve with Hardned trim will help in eliminating Erosion damage.
  8. tsenthil

    Cryogenic Globe Valve Flow Direction

    Even for Flashing, i believe the flow direction should be similar to cavitating service as inlet in only liquid. For Flashing we higher size valve or higher Cv required to handle gas expansion in the downstream.
  9. tsenthil

    Cryogenic Globe Valve Flow Direction

    A Piston Actuator can be used in a unbalanced trim to counter Bath Tub Stopper effect instead of standard Spring & Diaphragm actuators. However if your liquid is cavitating and valve manufacturer uses a muli Hole anti cavitation cage, the flow to be happen over the plug. They ideally want to...
  10. tsenthil

    Position Control of a Pneumatic Actuator

    You can use a positioner/Position transmitter combination to control the position of Pneumatic Actuator. Normally Positioner like Siemens PS2 or Fisher DVC2000 or Metso ND9000 are available with inbuilt position transmitter which will give you 4-20 mA output related to your Actuator position.
  11. tsenthil

    Non Bleed Positioners

    Jim, Its sounds very basic but please explain 1. Is Spool Valve and Flapper/Nozzle design(Fisher DVC) same? 2. Piezo valve is the same technique used in Solenoid Valves? 3. Some vendors (Siemens Sipart)claims their positioner as Fail Freeze. Is this related to Zero Bleed?
  12. tsenthil

    Non Bleed Positioners

    What is Non Bleeding Type Positioners? Can anybody explain in details. I thought all positioners has to bleed while in operation.
  13. tsenthil

    PTFE Packing for Fugitive Emission control

    Can we use PTFE Gland packing in Fugitive Emission Control design (Globe Valves). I heard PTFE will fail during thermal cycle tests as prescribed in ISO 15848? Also is double packing arrangement is a must for FE design?
  14. tsenthil

    valve material

    LF2 & LCB are basically same Low Temperature Carbon Steel, which can be used up to -49 deg C. LF2 means forging and LCB is the equivalent Cast Version. Normally Forging version limited to 4". Above 4" Casting is much cheaper. Whats the minimum design temperature? If it less than -29 deg C...
  15. tsenthil

    Pneumatic Diaphragm and Pneumatic Piston Actuators

    Yes Jim You are very much correct. In my previous post i limited to comparison of 2 types of actuators. Thanks for your valuable inputs.
  16. tsenthil

    Service is Sour Oil and Gas mixture (Presence of Sand)

    Dear Moorthy, With our experience on Sand service, there is no comparison between stellite 6 and Tungsten Carbide. So far we have experienced that the Tungsten Carbide coating is the best solution for Throttling Sand Service. If the service is cavitating or Flashing, please select a Globe or...
  17. tsenthil

    Pneumatic Diaphragm and Pneumatic Piston Actuators

    Diaphragm Actuators are most used actuators in Globe Control valves because the cost wise Diaphragm Actuators are very less when compared to Piston Actuators. Important advantage of Spring Diaphragm Actuator is that for most of the actuator the spring range will be 3-15 psi and in case of...
  18. tsenthil

    Vaccum sealing arrangement in valves

    Are you asking for Standard Valves or Control Valves? If it is control Valves, i can help you with List of Critical Control Valves.
  19. tsenthil

    NACE MR0103 and NACE MR0175

    NACE International founded in Year 1943 for recommending materials for Oil & Gas Industries and since 1943 it has produced more than 100 standards. NACE Mission – To Protect People, Assets & Environment from the effects of Corrosion & Sulfide Stress Cracking: Ø Combined action of Tensile...
  20. tsenthil

    Specific Gravity for gases

    Its sound very basic but please explain me how to calculate Molecular Weight from Relative density of a particular gas. I have a case where relative density of a gas at STP is 2.94 lb/ft3. So what will be the Molecular weight?

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