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  • Users: sujins
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  1. sujins

    How to design low/high signal select input to relay

    In some process design, I saw the low/high select signal input to relay to select the source of output signal. The signal may come from HIC or from two controllers (i.e.one from temperature controller and another come from pressure controller)to compare the signal at the relay. How can we...
  2. sujins

    Purpose of HIC

    I've just wonder the function of HIC (Hand indicate controller). Is it used to manual open for control valve,etc during startup or shutdown in process or...? In some design, the system have a control valve which can operate in "AUTO" and "Manual" mode why do we need to have HIC to manual open or...
  3. sujins

    Shut-off pressure of pump

    I can't see any information from your link. Please help answer.
  4. sujins

    Shut-off pressure of pump

    What is the disadvantage of running pump at shut-off head, zero flow rate?
  5. sujins

    Operating of reciprocating pump

    My question is that if I need the pump to run at discharge pressure of 5 barg to compensate for the pressure drop in the discharge line and achieve the required process pressure at around 0.5 barg, then can I adjust the discharge pressure at the pump or it will automatically supply the pressure...
  6. sujins

    Operating of reciprocating pump

    Please any expert explain when operating reciprocating pump. If the process require flow rate with lower pressure than discharge pressure from pump. Let's say required pressure = 5 barg but discharge from pump is 414 barg. How can we reduce pressure? Is it adjustable to achieve the desired value...
  7. sujins

    PDSLL for cryogenic pump

    Anyone please help explain the function of pressure different switch low low (PDSLL) between the suction and discharge of cryogenic pump. Is it use to protect the pump? or I mean the real reason to have it. Thanks.
  8. sujins

    PDSLL for cryogenic pump

    Anyone can explain the function of pressure different switch low low (PDSLL) between the suction and discharge of cryogenic pump. Is it use to protect the pump? or I mean the real reason to have it. Thanks.
  9. sujins

    limit flow of restriction orifice

    1) Please anyone can explain more for the topic. How can restrict orifice limit the flow rate? I mean when it is installed to the pipe the flow rate will constant regardless of upstream or downstream pressure, is that right or not? 2)And when sizing the restriction orifice, is it used the same...
  10. sujins

    limit flow of restriction orifice

    Please anyone can explain how can a restriction orifice limit the flow rate of liquid through the pipe. Thanks in advance.
  11. sujins

    Pressure difference of control valve

    Normally, when we size the control valve, should we use the actual pressure drop or maximum allowable pressure drop that liquid will not cavitate. Anyone can suggest more. Thanks.
  12. sujins

    Pressure difference of control valve

    When sizing the control valve and after calculate the actual pressure drop of system and maximum allowable pressure drop of control valve, found that actual pressure drop less than max.allowable. Then select the actual pressure drop to size the control valve but the result shown that the...
  13. sujins

    SIVL pipe

    Please anyone who know where to find the specification of SIVL (super insulated vacuum line)for cryogenic liquid (pipe id., od.,etc) Thanks in advance for suggestion.
  14. sujins

    Minimium flow of pump

    Could anyone please explain more!! I haven't yet cleared the point. 1. When we throtting the control valve at the outlet to receive the required flow rate,do the pump regulate itself to the new flow rate and that control valve will absorb for the higher pressure drop? Then the recirculation...
  15. sujins

    Minimium flow of pump

    1.Can any expert help explain, what is the minimum required flow rate of pump? 2.In the situation that we have to throttle the discharge flow because the rated flow is not at the intersection of pump curve and system curve(the rated flow is less than the flow at the intersected point, do we...
  16. sujins

    Pressure drop of control valve

    Thanks Jimcasey, 1.Anyway, for the min.,normal and maximum flow rate for sizing the control valve, can i use 75%, 100% and 110% of normal respectively? Any suggestion!! 2.Is there any limit for the pressure drop of control valve? Do we have to consider for the maximum pressure drop in order to...
  17. sujins

    Run-out condition

    Thanks for your answer. Quark. What i mean is that at the point where pump performance curve and system curve meet together, Is that point is the flow rate that will receive when we operate that pump? and does it have a criteria to choose where to determine the design flow rate? At that design...
  18. sujins

    Run-out condition

    Please any pump expert explain the term of run-out condition? How it has been occured? and Does it have a criteria to select the max.flow rate, normal and min.flow rate for pump to operate? Thanks in advance.
  19. sujins

    Pump impeller

    Is there anybody know how much we can trim the diameter of impeller in percentage(Any limit to the original size)? And can we bring the affinity law to calculate the pump characteristic curve at reduce impeller size? Please suggust!
  20. sujins

    Two control valves for liquid transfer with pump

    Please anyone give answer or suggestion for the above mentioned detail. I really need help urgently!...

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