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  1. Instr13

    Gasket of a valve or in-line meter with lining

    Thanks Scipio. The lining is already damaged but I am not sure if we need to replace the meter or just the gasket, for sure with a non-metallic one. Are you aware of any standard that might help us determining if we can still use this meter considering scratches on the surface of the lining due...
  2. Instr13

    Gasket of a valve or in-line meter with lining

    Hi, The pipe specification is asking for a spiral wound gasket but the flow meter has a PTFE lining. The spiral gasket has already damaged the face of the lining. Could you please give me an idea that if only replacing the gasket with a non-metallic one is sufficient. Another question that I...
  3. Instr13

    Control Valve minimum body size

    Hi, In many specifications of refineries (Oil&Gas), the minimum body size of Control Valves specified as 1 in and 300# class regardless of Pipe size and specification. Could anyone give me an explanation. I am trying to replace a 1/2" pressure regulator with a control valve therefore I am...
  4. Instr13

    Level control valve of steam condensate pot

    Thanks for all your valuable postings. We are retrofitting the trim because of changing the process load. That is the reason I tried to figure out if any of you may provide me a guide line for new trim selection and or changing the pipe route.
  5. Instr13

    Level control valve of steam condensate pot

    Hi, For controlling condensate level in a LP steam condensate flash drum we are using a globe valve 1-1/2" in a 4" pipe. Calculation shows that flashing occures inside the valve. Any suggestion for retrofitting the existing trim and or changing the piping layout. Process conditions are P1=40.6...
  6. Instr13

    Steam Flash Drum Level Control Valve

    Hi, For controlling condensate level in a low pressure steam condensate flash drum we are using a globe valve 1-1/2" in a 4" pipe. Calculation shows that flashing occures inside the valve. Any suggestion for changing the existing trim and or changing the piping layout. Process conditions are...
  7. Instr13

    Catalyst mixing tank mltipoint temperature

    Hi, For preparing catalyst we are using a 7' ID by 9' T/T Carbon Steel mixing tank with agitator at around 30 % height of the vesssel from the bottom. Vessel is vertical. We are going to install temperature element to measure and control the fluid (mixed) temperature at 25 (±5) deg C. A 4"...
  8. Instr13

    FLOW ELEMENT AND CONTROL VALVE

    Hi, Could anybody brief me about why we normally put Orifice plate upstream of the associated flow control valve in the flow loops. Is this because of upstream requirement of the orifice plate?
  9. Instr13

    Catalyst Mixer Temeperature Control

    Hi, For preparing catalyst we are using a 7' ID by 9' T/T Carbon Steel mixing tank with agitator at around 30 % height of the vesssel from the bottom. Vessel is vertical. We are going to install temperature element to measure and control the fluid (mixed) temperature at 25 (±5) deg C. A 4"...
  10. Instr13

    Noise Level Calculation

    Hi Guys, We have an air blower and are going to bleed partially through a control valve to the atmosphere. Inlet pressure to the control valve is 90 kPag, flow 1700 kg/hr at 105 deg C. Would you let me know if we require any silencer. The line size is supposed to be 3". The valve noise...
  11. Instr13

    Control valve stroking time estimation

    Thanks for your information. The actuator is spring return piston 25 liters(6.61 gallon)volume. The solenoid has Cv=1.7 and the pressure on the piston side is 80 Psig(before venting). 1- Any idea about the formula and stroking time calculation for single actuator or two actuator venting through...
  12. Instr13

    Control valve stroking time estimation

    1- How can I estimation a ball valve full stroking time with spring return piston actuator. Any formula or guide line. The valve is in ON/OFF application for depressurizing a reactor. 2- Does it stroking time differ if two actuator relieve through the same solenoid?

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