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  1. Vishal Kumar

    Compressor shutdown

    How is a normal compressor shutdown can you explain in short steps , I know first anti surge valve is opened and then it is tripped via the motor or turbine but in case of emergency shutdown , power most likely goes first followed by ASV opening, I feel both have the same impact that is Settle...
  2. Vishal Kumar

    IPDS

    Can anyone suggest me any resources or guidelines to fill a particular instrument ipds like on off valve , flowmeter and control valve particularly because I have seen everyone using different max min values as a percentage of the normal value like flow pressure temperature. I want to know and...
  3. Vishal Kumar

    Utility delta T

    Hello all, I have a general question as to why the utility delta T across a cooling tower or chiller (water based liquid utilies) are we considering 5C. What is special about this number , also currently my CW delta T in plant is 2C , so is my statement wrong that : Some heat exchange Equipment...
  4. Vishal Kumar

    Utility line control valve

    For any utility piping with a control valve on return side , controlling temperature of a equipment or process line in circulation. Do you think it will be a good idea to put a bypass valve for the control valve or will it be hazard that on opening bypass process temperature can go out of...
  5. Vishal Kumar

    Steam limpet pressure drop

    Dear all, Please find the attachment where we are using steam Saturated (3.5kg/cm2g) for heating through limpet to keep internal material in liquid state (melting point 63C). I have two doubts , considering the size of this tank the height , is it a good idea to use one single limpet through the...
  6. Vishal Kumar

    Storage tank temperature maintenance

    Hello all , Can you guide me how to know utility flow rate for maintaining temperature of a storage tank at 80-85C. Storage tank is storing a product of melting point 65C , inlet lines are electrical traced & coming at 80 C. How to do energy balance for storage tank to maintain that...
  7. Vishal Kumar

    Hydrogenation

    Can anyone share the experience of how they developed the control logic for hydrogen feeding for a batch hydrogenation reactor? Was it a pressure control loop or flow control loop or cascade system. Please help Or although I doubt but was it a temperature loop
  8. Vishal Kumar

    Shutoff pressure

    I have a query , we have a reactor pump system (working+standby) same suction line obviously. Shutoff pressure for both we are getting different. How is this possible? Impeller we have checked for both & are matching to the specification and with each other. Is RPM a possibility, that one of...
  9. Vishal Kumar

    Melt crystallizer

    Can anyone send me draft P&ID of a static melt crystallizer used in commercial stage for knowing proper instrumentation and operation? Also please share if any major equipment fault you have encountered or mistakes made too often that you think. Currently in India, this tech is not used much and...
  10. Vishal Kumar

    Power number

    Hello all , Power number of commonly used agitator are available in literature Please help me out to understand how to calculate the power number for an agitator with more than one stage with different combinations of PBT,hydrofoil,anchor with each other etc. Data (number of stages, imp stage...
  11. Vishal Kumar

    Hello all, I am facing a dilemma

    Hello all, I am facing a dilemma at operation stage . please help me out with your comments on below issue which sounds simple but I have no answer. I have a feed mixture of 30% K2CO3 , 10% DMSO ,60% water. K2CO3 is soluble in both DMSO & water. How to know it's amount soluble in DMSO & water...
  12. Vishal Kumar

    Graphite block HE

    Can anyone help me which software to use for graphite block HE design/simulation for validation purpose ? I have the process data with me and want to use it for arriving at block dia, area, noof holes.i.e the process design
  13. Vishal Kumar

    Pvrv set point

    Please suggest how to decide set pressure of a Pvrv/breather valve. Size can be established by api 2000 but set point ? We use storage tanks atmospheric for storing many solvents like mdc , toluene , acetonitrile etc. Please suggest how to decide the set point.
  14. Vishal Kumar

    Pump terms

    Hello , i am in a batch Industry. Wanted to know regarding some pump terms. The flow that is reqd for transferring from one tank to other that we get from a BFD/PFD that is the normal flow ? Then what is the rated flow of a pump ? The flow/head mentioned with the tag number all are rated? And...
  15. Vishal Kumar

    Cooling tower

    What is an usual value for cooling tower efficiency ?? Mine is coming arround 22% sounds so low or is it matching Industry standard. What r ur takes
  16. Vishal Kumar

    Flame arrestor

    Can anyone provide info regarding flame arrestor sizing or if there are no standard methods it just has to be the size of the vent line.
  17. Vishal Kumar

    What does a cooling tower cell mean

    What does a cooling tower cell mean? Individual towers? If a cooling tower is 2000TR of 4 cells..so each will be 500. And do the cells work in parallel or series
  18. Vishal Kumar

    Api 2000

    Can anyone point out any sites to download api standard PDFs for free....or i need api 2000 7th edition. What difference is it from the 5th edition of 1998 . I prepared a spreadsheet with the old one....does it still give proper undisputed results?
  19. Vishal Kumar

    Rupture disc

    Hello. In my company RD outlet is directed to KO pot. PSV to atmosphere generally. So if i want to size the rupture disc i can't use 8 & 5 method because the discharge is atm but length is not 8 or 5 pipe dia. So which method is suitable any reference or info pls guide. I am a beginnner and...
  20. Vishal Kumar

    IA header

    I want to know the basis of sizing IA headers. Can anyone have any info on approximate air consumption rate of an automatic valve. To find approx ia load ...or is there any other better way of sizing?

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