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  1. swazimatt

    Lift Station Troubleshooting

    interesting that the US has significantly higher WW demands than i have seen elsewhere in the world
  2. swazimatt

    Combining Epanet Networks

    I have two epanet networks for adjacent sites and would like to combine them into a single network but am really battling to import one into the other without loosing data the closest i got was exporting to text and then importing the text, but it only imported the text blocks and messed up...
  3. swazimatt

    Lift Station Troubleshooting

    we normally design our wetwells for run cycles of 1-15 cycles/hour so i would say 5-10 mins is fine for a small submersible pump and generally limit the on time to at least 1 minute
  4. swazimatt

    salary rant

    somewhat related. How many of you get bonuses on top of your salary? I have always felt that with our feast-famine cycle of the industry the salary should be maintained at a sustainable rate throughout and hard work (over and above) or good company performance should warrant an appropriate...
  5. swazimatt

    salary rant

    This is exactly why companies try to encourage you to keep remuneration confidential. I have tried to encourage open discussion around this amongst peers as it does provide insight into your own value to the company. I also enjoy working in the company i am at, and while i know i could push...
  6. swazimatt

    ADVICE, is It possible?

    this is not a load bearing wall (being only 1m high - not sure how that would create additional shops though) I would expect it is significantly under any standard dead loads specified in any structural code The higher risk to the structure is the shops themselves there is no control on what...
  7. swazimatt

    Dismantling Joint and Magnetic Flowmeter Installation

    That is a question to the supplier of the flow meter. normally they just specify xDiameters of straight pipe upstream and downstream, a bend is probably more likely to cause turbulence than the irregularities of a dismantling joint (which won't be too different to the flanged joint between pipe...
  8. swazimatt

    Field Drainage Across Power Cable

    there is no reason why the cable can't go deeper, and then sleeve the cables (add a few spare sleeves as well for good measure) so that the cables could be removed without digging up the drain. of the two, the drain is 100% the most likely to need maintenance
  9. swazimatt

    Trenching Groundwater

    based on depth i assume this is a gravity pipe (ww/sw) so cannot be made shallower - in addition to @HTURKAK comments if the insitu soil is saturated and unable to work on (some silts are highly sensitive to moisture and become liquefied) we often over excavate the trench to decent soils or a...
  10. swazimatt

    stormwater pump station

    aside from the technical stormwater aspects of sizing your storage and pumps you need to assess the risk associated with failure of your pumps and/or freak storm events. In some instances it may just result in 300mm of ponding at which stage it reaches and overland flow path, in others it may...
  11. swazimatt

    stormwater pump station

    There is no one answer here, it is very much dependent on your council's requirements you need to develop a hydrograph of your design storm and then route it through a model of the detention and pump system. You can use free software like EPA SWMM to do this, but make sure your time steps are...
  12. swazimatt

    Tying into gravity sewer with gravity sewer

    I would imagine an 18-inch sewer pipe will always have some flow as it likely has a reasonably big catchment
  13. swazimatt

    Tying into gravity sewer with gravity sewer

    The norm is to connect with a London Junction as I suppose it will direct the discharge in the direction of flow as per the detail below. As you can see it does not involve much additional space as it is the last foot or two that is the 45. For old/in use clay pipes you can get a saddle...
  14. swazimatt

    Air valve on falling main

    Thanks LittleInch, The council requires all rising mains to be calculated on conservative friction coefficient of 1.5 so i expect the actual HGL to be higher than plotted.
  15. swazimatt

    Air valve on falling main

    We have adjusted the flows and pipe size on this and now are below both the high point and the second crest (not a high point that necessarily requires an air valve) I have manage to clear both by adding 2m of head to the pump duty resulting with a discharge pressure of 2m which i believe is not...
  16. swazimatt

    need help on where to go in the engineering field

    As someone who has redefined my role multiple times (all within the Civil Engineering field), and based on the post it looks like you do not have a definite preference, I would suggest you just start where you are offered a job. and if you do not like to trajectory (after giving it a decent...
  17. swazimatt

    Air valve on falling main

    My next question is: If the Head graph shows the highpoint is above the head (ie negative head - red line) do we increase the pump head until we have positive preassure throughout the rising main (blue line) with the risk of dischargin to the manhole with a few meters of head (how much head at...
  18. swazimatt

    Air valve on falling main

    this is my worry, if the pump turns on again while the pipe section is draining (from the bottom) it will pump out slugs of compressed air that will "explode" into the discharge manhole and make a real mess.
  19. swazimatt

    Air valve on falling main

    this was my first question, but apparently the client wants the discharge from this pipeline at the terminal ww pumpstation
  20. swazimatt

    Air valve on falling main

    the upstream end is open, however it would need to flow through the pumps and non return valves, and as the downstream drop after the high point is about 4.5m less than the upstream side i do not believe there is sufficient drop to create a siphon. (the engineer in me still wants to know what...

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