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  1. boost33

    Hydraulic Conductivity

    Thanks for the help. That pdf is pretty good also. I think you're right about the experience. Our prelim tests tell us that we ave a potential problem. We are excavating a pit (about 2x2 or 2m x 1m) to better assess the situation. We might get a dewatering company involved with that also...
  2. boost33

    Water inflow to Test Well - to calculate Hydraulic Conduct

    Hi there, We are performing a pipeline install and the groundwater is quite high. We want to know the hydraulic conductivity so we know how much water to expect in the trench. I.e. this will help to determine how much dewatering is necessary. I am trying to measure the rate of inflow into a...
  3. boost33

    Hydraulic Conductivity

    Hi there, I am trying to measure the rate of inflow into a test well. Diameter is approximately 45-50mm. The well has groundwater down at about 0.8-1m and you hit the bottom of the hole at 2.2m. What I plan on doing is bailing out the water (using a pump), then measuring the time it...
  4. boost33

    Rotary Encoders - Help please

    Hi there, We are looking at using a low profile encoder for use on a product that needs IPX1 certification and resistance to water ingress from spill testing. ELMA make a Type E33 that seems to be good. Does anyone know of other companies that do ones with internal o-ring sealing? These...
  5. boost33

    Rotary Encoders

    Hi there, We are looking at using a low profile encoder for use on a product that needs IPX1 certification and resistance to water ingress from spill testing. ELMA make a Type E33 that seems to be good. Does anyone know of other companies that do ones with internal o-ring sealing? These...
  6. boost33

    Modelling flow through orifice - very small part - using CFDesign 9

    Thanks. The flow path inludes one orifice in the inlet then a small chamber (the pressure in this chamber works on the diaghram) and the outlet/bleed hole also has an orifice. The fluid is air. What I have found: Setting inlet Pressure and outlet pressure gives some results but the results...
  7. boost33

    Modelling flow through orifice - very small part - using CFDesign 9

    Yes it is air at around 25 deg C Thanks for the replies. Is the outlet orifice still choked at 200Pa inlet? I'll have to go back and check my test books re. choked flow. What I have done is set the inlet pressure (200Pa) and flow (0.4L/min) (We can do this I believe). We then set the outlet...
  8. boost33

    Modelling flow through orifice - very small part - using CFDesign 9

    Hi there, I am trying to measure the pressure drop across a 0.4mm diameter 3mm long orifice. This is a bleed of hole. The inlet is also a similar sized orifice. Air enters at around 0.5L/min at approx 200Pa (gauge) into a chamber that acts on a diaphram with the bleed off orifice present...
  9. boost33

    Modelling flow through orifice - very small part - using CFDesign 9

    Hi there, I am trying to measure the pressure drop across a 0.4mm diameter 3mm long orifice. This is a bleed of hole. The inlet is also a similar sized orifice. Air enters at around 0.5L/min at approx 200Pa (gauge) into a chamber that acts on a diaphram with the bleed off orifice present...

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