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  1. diapensiya

    Monitoring waste water COD/TOC/load

    In our plant we have a wastewater tank. At the outlet of this tank, TOC is measured. When TOC exceeds certain value, there is an alarm in the control room. The operators are expected to find the root cause of the high load. However, there are multiple inlets (from different unit operations) to...
  2. diapensiya

    lowest vacuum achievable in a vacuum distillation column

    I want to separate two high boiling point components from each other. (Atmospheric Boiling points 250-300C vs 300-500 C) Thus, I need deep vacuum. I investigate the option of using a traditional vacuum distillation unit followed by an evaporator. (There are other options I am investigating as...
  3. diapensiya

    flow characteristic rotary steam valve

    Thanks for the answer. Let me check if I understand you correctly. You mean that the valve flow characteristics is linear but the size is not suitable. Thus, I see a nice controlling valve till 25% opening and above that there is another limiting factor which causes the variation in the steam...
  4. diapensiya

    flow characteristic rotary steam valve

    Hello, In our plant, we have a steam valve which controls MP steam flow to a reboiler of a distillation column. I investigate whether it is possible to increase flow through this steam valve by changing the valve (internals). The type according to documents is Masoneilan Camflex. Exact details...
  5. diapensiya

    Mixing viscous liquids in storage tanks

    Good information. Thanks for the help. I will look reconsider using mixers in that case. 10-15 hp sounds reasonable.
  6. diapensiya

    Mixing viscous liquids in storage tanks

    Hello Latexman, Thanks for the info. Very interesting. Do you mean the time to circulate the liquid in the entire tank is < 1hr ? Do you have recirculation in the tank separately ? Difficult question but can you indicate how good the mixing is ? Is is only to create fine particles in the liquid?
  7. diapensiya

    Mixing viscous liquids in storage tanks

    It is right. I expect sparging to create holes and disturbs mixing. With high mixer speeds in the reactor of the resin we had quality issues. Pumping from multiple places could be a solution. Two reasons for not wanting a mixer:1. It is horizontal tank. Due to space and process limitations it...
  8. diapensiya

    Mixing viscous liquids in storage tanks

    Thanks for the answers. It is resin with solvents. Mixing is required to keep temperature homogenous and make sure solvents are not accumulating at the top of the resin. Temperature is a given and has to stay constant. I dont think there is foaming issue.is it feasible to sparge gases through...
  9. diapensiya

    Mixing viscous liquids in storage tanks

    How can you mix a 55 m3 atmospheric storage tank with a viscous liquid (different products are stored) in the range of 200 to 6000 cp without using a mixer with huge motor?
  10. diapensiya

    Sizing orifice at cooling water outlet of condenser

    What is the purpose of an orifice at cooling water of a condenser ? How should it be sized ?
  11. diapensiya

    API rules about coolant temperature inlet for compressors

    It is a multicomponent mix. Indeed I am planning to simulate to check when there is condensation
  12. diapensiya

    API rules about coolant temperature inlet for compressors

    Hi all, I have question about a statement in API standard 618 with respect to cooling systems in compressors. It is stated that coolant inlet temperature shall be 5K above the inlet gas temperature. Do you know the source of this rule ? Is this a general recommendation to increase the life of...
  13. diapensiya

    how do conductivity meters measure at winter conditions ?

    Thank you all for the answers. I see now how the temperature is corrected. It is true that I am interested in spikes in the conductivity measurement to detect organics. The issue I am thinking of is what will happen if there is low measurement or spike due to lowered temperatures ? Then there is...
  14. diapensiya

    how do conductivity meters measure at winter conditions ?

    Hello all, I have been working on a system which requires (electrical) conductivity measurement of organic metarial in an aqueous stream. The aim is to prevent organic material to end up in drain lines. This is done by shutting off the valve on the pipeline when the conductivity meter shows...
  15. diapensiya

    how to prevent temperature increase in pump system

    The pump is tripping :) Sometimes the operation needs change. Then bypass is needed. It is good to learn about different control valves. Thanks for the help and the information.
  16. diapensiya

    how to prevent temperature increase in pump system

    Normal operation flow rate to the column is 25 m3/h. It makes the flow through the pump 45 m3/h. Rest is by pass.
  17. diapensiya

    how to prevent temperature increase in pump system

    I put some values on the curve in attachments. Currently when the flow is set to 5 m3/h, it means that the discharge pressure is 3 barg by the discharge pressure control. The by-pass through the pump is huge, at the end of the curve. The heat exchanger sees 3 barg. The normal operation flow is...
  18. diapensiya

    how to prevent temperature increase in pump system

    Thank you for the sketch. Indeed it is where the start-up flow is. To give a simple example of how PLC controlled valve acts: Lets say Min flow requirement = 11 m3/h Set point of flow to column = 5 m3/h So By-pass line flow = 6 m3/h Total flow through the pump = 11 m3/h corresponds 7 barg in...
  19. diapensiya

    how to prevent temperature increase in pump system

    I agree that first valve on the left should be removed. Currently it is kept closed, thats why it is in the sketch. And yes I also consider putting an orifice after the pump not to go beyond the operating range. What I understand is that you suggest that ARV taking care of preventing dry...
  20. diapensiya

    how to prevent temperature increase in pump system

    This is an old running system not my design. How would you solve the problem of temperature increase? How would you start the pump without damaging the heat exchanger ?

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