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  1. hydrae

    pressure drop test nitrogen instead of helium

    There are 2 big differences between He and N2 He has atomic mass of 4 and N2 has an atomic mass of 28 This is a 7 factor ratio in the mass per molecule/atom this difference in mass will affect the throttling characteristics The other is He is monoatomic, it is just one atom per molecule and...
  2. hydrae

    reservoir and Booster pumps

    Make the fill valve pressure sustaining in addition to level control. I do not know your pressure readings so as an example ( I am used to imperial units so I will convert to bar) pumps start at 3 bar pumps regulated to 3.3 bar fill valve regulated to 3.7 bar so if pressure at the tank is...
  3. hydrae

    Overture Boom

    Scott Manley visited the testing site and has a video on the subject https://www.youtube.com/watch?v=ITGgRhjcHAM he was there just after the 4th flight test of the model unit
  4. hydrae

    Sodium Hypochlorite Tank for Drinking Water Well

    Check your local supplier if they have carboys 15 gallons and weigh 130 lbs. So can be moved with a hand truck My crew picks them up with a maximum of 6 at a time in a trailer or pickup bed need to keep it under 1000 lbs., otherwise placards and hazmat are required. My local delivery is a...
  5. hydrae

    Is there a Standard Definition of Lugging an Engine?

    Lugging used to be really bad as the oil pumps (or other methods such as slingers) were fixed size and a low rpm and heavy load would not float the bearings and cause damage. Modern engines have better oil control to avoid this.
  6. hydrae

    Horizontal clearance to reaction block

    Without a thrust face in undisturbed soil, the volume of material to hold the block in place needs to rely on gravity and friction, a complex calculation. Vertical thrust blocks use gravity for the vertical down bends and enough rebar is added to hold the block together, and there is enough...
  7. hydrae

    Sandtrap design Does anybody hav

    I remember seeing a chart that had particle size verses drop velocity for particles with specific gravity of 2.65 (silt/sand/pebbles in water) but I do not remember where that was. So, targeting the particle size you wish to capture, then ensure flow across the bay is has a Reynolds number less...
  8. hydrae

    C-900 vs. Ductile Iron

    I use C-900 all the time A few vulnerabilities Shading is important if using native backfill, but that is true of all buried pipes. Inserting the spigot into the bell the correct distance and not all the way. If the pipe is consistently pushed to home, the pipe can fracture starting where...
  9. hydrae

    Minimum Water Main Pressure

    Friction loss is not your problem. 30 gpm in a 4 inch has minimal friction loss. increasing to 6 inch will not fix that. Is the pressure from the supply consistent? Do you have power? Can you get power? if no power, a small bank of solar panels could power a set of 1/6 or 1/3 hp circulating...
  10. hydrae

    Corrosive atmosphere from leaking hypochlorite tank?

    Ed There I beg to differ I prefer to replace a cheap plastic fan when it fails in 5 to 10 years which pulls a suction on the room and vents it outside (put the fan in an easy to replace location) Than to pressurize the room with the corrosive agent which will leak out any penetration be it...
  11. hydrae

    Corrosive atmosphere from leaking hypochlorite tank?

    This is a case where the designer look at a chemical, in this case NaOCl and see that if the concentration is less than 1% it is not hazardous according to NFPA, which is why salt generators run that low of concentration. True all sorts of rules fall by the wayside, (containment, placarding...
  12. hydrae

    Replacement bladders for potable water expansion tanks

    I have had good luck about a decade ago with Charlatte my client had a bladder fail and they replaced it under warrantee https://charlattereservoirs.fayat.com/en
  13. hydrae

    Rocket general questions

    The grid fins do not fold down on super heavy, that is part of the design, they do twist though. The grid fins are also support structure for the tower to catch, lift, set and hold while at the launch stand. My guess adding a pivot weighs more than the performance loss of having them in the...
  14. hydrae

    Table Top Fire Flow Calculation

    EPAnet it is still free...
  15. hydrae

    short term spikes in the output

    Thanks for all your comments We got the SCADA settings to ignore the spikes and will schedule a replacement sensor and cable as soon as time and budget allow Hydrae
  16. hydrae

    short term spikes in the output

    Thanks Dan Yes it is a 2 wire loop powered device, there are no motors in the area or any other source of noise, it is a tank on top of a hill, there is a farmhouse nearby but no heavy machinery. the times of the spike appear to be random. I do not have a tight correlation on the source being...
  17. hydrae

    short term spikes in the output

    Thanks for your quick replies Spikes would not be real It is a ground level steel water tank for domestic use 350,000 gallons The fluid is filtered water Spike height is different value every time Scada box transmits the reading every 2.5 minutes, the window you see is a few hours the...
  18. hydrae

    short term spikes in the output

    Got a problem I haven't seen before, got these spikes in the output of a submersible pressure transducer These spikes occur at random times about once a day or so This is measuring level in a water tank Tank is 24 ft tall The reading ignoring the spikes is cycling between 18 and 20 ft...
  19. hydrae

    conflict of interest? insurance

    If you have doubts, figure a way to test the structure. I had a project were a concrete earth anchor was loaded by a falling tree the broke the wire rope it was holding, when we installed the new rope, we then did a test load (at 2x) and confirmed it was solid. Your loads are vertical down, so...
  20. hydrae

    Thrust block installed on top of pipe bend

    We called is a gravity block and the detail I am familiar with puts all the concrete below the pipe and uses loops of rebar around the fitting into the concrete with j-hooks embedded into the concrete The pipe will also have polyethylene encasement to allow access to the bolts in the future...

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