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  1. JH2015

    Working with electrical/PCB engineers

    @drawhoh - thanks - if you work with Altium, have you tried their "CoDesigner"?
  2. JH2015

    Working with electrical/PCB engineers

    Thanks guys, for all the replies. I have never liked the reliance on sending files backwards and forwards - the hassle of constantly exporting/importing, and the risk of my updates not being incorporated by my EE colleagues (missed the email, imported a previous version etc). Since my original...
  3. JH2015

    Working with electrical/PCB engineers

    Hi all I wondered how you guys deal with passing information to and from any electrical engineers that you work with? In my experience, there are always problems with them understanding the mechanical restrictions we have for the PCB size and shape, and locations of mounting holes etc. Do you...
  4. JH2015

    Basic question about flow and pressure convention

    It is not a residential application. The partially closed valve had a known pressure drop as I measured it - 1 bar upstream, free discharge immediately downstream, therefore 1 bar pressure drop at 1.2 l/s. The tap was to allow me to measure and specify a supply flow and corresponding pressure...
  5. JH2015

    Basic question about flow and pressure convention

    "This statement is incorrect and meaningless because if the pressure is only 1 Bar at the ground level service tap, the water will not flow out of the tap at a higher elevation of 10 meters." OK, but please explain what's wrong with this logic then: 1 bar is measured upstream of a partially...
  6. JH2015

    Basic question about flow and pressure convention

    Thanks for all the replies. There are obviously lots of different ways to talk about flow and pressure, but I wasn't sure if there was a standard convention amongst plumbers. I'm sure I've seen a plumber measure the pressure at the outlet of a tap by blocking the flow, and it struck me as a...
  7. JH2015

    Basic question about flow and pressure convention

    The actual numbers are made up for the sake of illustrating the point...
  8. JH2015

    Basic question about flow and pressure convention

    When a domestic water supply to a building is specified as flow and pressure available at a tap of 1 bar and 1 l/s for example, does this mean A) 1 bar behind tap when closed, and 1 l/s out of tap when opened or B) 1 l/s available when tap is opened, with an added headloss of 1 bar? Unless I'm...
  9. JH2015

    Compressed air consumption convention

    Thanks for the replies, really useful stuff. Much appreciated.
  10. JH2015

    Compressed air consumption convention

    Exactly, that's why I'm asking for the opinion of people that know better than me!
  11. JH2015

    Compressed air consumption convention

    Thanks for the reply. There are some cases where it's not possible for me to confirm, so I was just wondering if I had to guess, which would be more likely, based on common practice in the industry. For this particular example however, the units are l/min not Nl/min so possibly b) is more...
  12. JH2015

    Compressed air consumption convention

    Hi In the industry, is it normal to give compressed air consumption figures as free air (i.e. "normal" or "standard" - atmospheric pressure) volumes rather than an actual volume at the given pressure? For example, if an equipment data sheet states that the air pressure required is 4 barg, and...
  13. JH2015

    Quick check please!

    I feel stupid now - I could have looked up that cross section myself couldn't I? Thank you for pointing out the obvious. It is indeed one of these types rather than a quarter turn. Looking at the section it is clearly nowhere near full bore when open. I can use my measured results to...
  14. JH2015

    Quick check please!

    Hi. Thanks for the reply. Sorry, all lengths/distances are mm. Since posting someone else has also mentioned the tap. I had assumed it would open to full bore and have therefore modeled it in friction loss terms as an open gate valve. Maybe that's the issue though? The tap looks like this...
  15. JH2015

    Quick check please!

    Hi I've got some measurements that don't add up according to my calcs. Please would someone be kind enough to check and see if I'm doing something obviously wrong, or there's a problem with my measurements? All the info is in the attached sketch. I've measured 1.2-1.4 barg at the T, and am...

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