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Recent content by mjkey

  1. mjkey

    Duct Leakage Testing and Equation Query

    Thanks all for the input. @GT-EGR: thanks for the information. I think i've got my head around how it works now. Basically each "section" of duct that is to be tested (capped and closed), will be subject to their respective "max" pressures. With the test being a static pressure test to the...
  2. mjkey

    Duct Leakage Testing and Equation Query

    Hi all, I have a question regarding the "pressure" value for the duct leakage equation below (I've copied and pasted this from a paper I was reading): Qleak = C · As · ∆ p0.65 Qleak is the quantity of leaked air, C is a constant related to the duct tightness (which relates to the details of...
  3. mjkey

    Pipe Line Sizing - Water vs. Gas vs. Vacuum

    @EnergyProfessional @Compositepro Thanks for that explanation guys. Makes sense now with the reminder that gas is compressible (facepalm). I had a look at the IFGC guide and the tables within, I understand how to use the charts and size the pipe (eg. longest length method). However I'm still...
  4. mjkey

    Pipe Line Sizing - Water vs. Gas vs. Vacuum

    Hi guys, I've come across a problem which I can't seem to find an answer to online. Is there any difference between the method of sizing pipe with water flow (say chilled/condenser water) or gas flow or vacuum air flow? The reason I ask this is because of the following attached charts from...
  5. mjkey

    Access and Maintenance of Ductwork/Equipment

    @willard3 - The wall are thick concrete walls. Are you trying to say put access panels in the ducts? @dbill74 - Yes all electrical connections will be away from the wall. Access panels can be put on the fan for access to the internal. Thanks for the replies guys, I guess my question really...
  6. mjkey

    Access and Maintenance of Ductwork/Equipment

    Hi all, I am working on a project where we are positioning a set of duty/standby fans and ductwork right up against a wall. My question is, has anyone done this before, and if so, were there any difficulties with access and maintenance, removal/installation of any of the equipment. I ask...
  7. mjkey

    Variable Speed Drives - "Slowing down the motor?"

    @itsmoked Appreciate your response. Yes the VSDs i'm talking about are VFDs used for fans. I guess my question really is, how do you "slow down" a fan with a VSD? How does it actually work? I understand how you can speed up the fan. But does do you slow it down? Cheers
  8. mjkey

    Variable Speed Drives - "Slowing down the motor?"

    Hi all, I have a question regarding Variable Speed Drives. I understand that it can have full control of the fan motor speed by varying the frequency and modifying the voltage/current. However, I've been wondering if the VSD can actually "slow" down the motor. Say the fan was running at...
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