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  1. relaxjack

    Advice on Pump Suction Line

    Thank you all for reply. [pipe]
  2. relaxjack

    Advice on Pump Suction Line

    Hi guys. Can any pump expert tell me what will be the implication of having a suction line like the one shown in attachment? Thank you.
  3. relaxjack

    Pump Sizing with Epanet

    Oops. Here are the instruction on the manual. Set the status of the pump to CLOSED. At the suction (inlet) node of the pump add a demand equal to the required pump flow and place a negative demand of the same magnitude at the discharge node. After analyzing the network, the difference in heads...
  4. relaxjack

    Pump Sizing with Epanet

    I came across this instruction in Epanet Manual on "How to size a pump to meet a specific flow". After going through the procedure in the program, i ended up with an unusually high hydraulic head value at the discharge node. Could it be that i have misinterpreted the instruction?
  5. relaxjack

    Dehumidification for Motor Control Centre

    Thanks for explanation Abby.
  6. relaxjack

    Dehumidification for Motor Control Centre

    Abby: After studying your link at http://i32.photobucket.com/albums/d41/a_bee_normal/Malaysia_MCC.jpg I have a question. 1) The calculated Cooling Load of 22,249 BTU/Hr @ 749 CFM should also be the minimum capacity of air-conditioning unit required?
  7. relaxjack

    Dehumidification for Motor Control Centre

    Many thanks to abby, quark & abcmex for taking time to reply this thread. I apologize for the lack of info as i wasn't the one who get to meet and discuss with the Client and Plant Specialist. My superior who went there was as clueless as me if not worst. The limited info were conveyed to me...
  8. relaxjack

    Dehumidification for Motor Control Centre

    if i were to use pressurize the room with outside air, would i need a filter to stop dust and particles from being sucked in? if so, what kind of filter is normally used? howabout those filter that are normally used in a AHU unit?
  9. relaxjack

    Dehumidification for Motor Control Centre

    Thanks again Abby. Your help is very much appreciated. will take a look at the example and talk to my Client again.
  10. relaxjack

    Dehumidification for Motor Control Centre

    The 85% RH ambient plant condition and the required 45% RH for MCC Room is actually given by the fertilizer plant specialist from India who were going to install all the equipments. It was based on their experience according to them. hmm... seems like i'll need to have a discussion with them...
  11. relaxjack

    Dehumidification for Motor Control Centre

    Your friend must be having a good holiday around those places. LOL. On the sensible heat load, electrical heat gain from the switchboard would be about 10,243 BTU/Hr. Assume that infiltration and occupant load is negligible, what other load should i consider as sensible load? Correct me if...
  12. relaxjack

    Dehumidification for Motor Control Centre

    almost forgot. howabout the CFM of the A/c unit?
  13. relaxjack

    Dehumidification for Motor Control Centre

    Im from Malaysia and its basically hot and humid here. so if i were to size an air-cond unit, the btu/hr of the unit should be equivalent to the [rate of sensible heat transfer + rate of latent heat transfer] in changing the temp + RH of the mixed air to desired room temp. + RH ?
  14. relaxjack

    Dehumidification for Motor Control Centre

    Thanks a lot for your help Abby. What would most likely be the source of latent heat? could it be the 10% of outside air intake by the air-conditioner? The switchgear should be the largest contributor of the sensible load right? Also, you're saying that i should size the air-cond. unit based...
  15. relaxjack

    Dehumidification for Motor Control Centre

    The Client has proposed to install split air-conditioning unit in the MCC rooms of a fertilizer factory for the purpose of cooling as well as dehumidifying the space to avoid dust and particles + water in the air to attach itself to the switchboards and therefore affect the insulation. My...
  16. relaxjack

    Sizing Breaker for Pump

    oh, i forgot one thing. howabout the sizing of the conductor ? shall i size it based on the starting current or the FLC ?
  17. relaxjack

    Sizing Breaker for Pump

    im from Malaysia and we are using the IEEE standard code. Anyone knows the limit on breaker size in compliance with the code?
  18. relaxjack

    Sizing Breaker for Pump

    waross: according to the manufacturer catalogue, the DOL starting current is 8x the FLC. if i were to size my breaker to 200% - 250%, wouldn;t it trip the breaker during starting ? im a bit confused now because i just read a book saying that circuit breakers must be sized to take the starting...
  19. relaxjack

    Sizing Breaker for Pump

    thanks a lot to itsmoked and waross for the quick reply. So based on the motor / pump load, what kind of starter is hest for me? DOL , Star-Delta or AutoTrans ? Is it true that if i were to select DOL, i'll have to size my breaker to 8x the FLA of the pump ? and howabout for S/D starter?
  20. relaxjack

    Sizing Breaker for Pump

    im rather new in this field so please forgive my ignorance. im not so sure of the LRA but from the manufacturer catalogue, the DOL starting current / Nominal Current = 8.

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