Quark, thank you for suggesting the Ergun equation, I will look into it further. I imagine the roughness and angularity of the aggregate are a significant factors and it would be interesting to see if such a calculation would be practical.
EnergyProfessional, we're using a washed high void ratio stone with very few fines. An example would by "AASHTO #57 stone" http://capitolflexipave.com/wp-content/uploads/2012/08/AASHTO-57-Stone-Specs.pdf. The structural engineers actually prefer this material below the slab on grade as it is...
Hello,
Can somebody recommend a test strip method for measuring pH in low alkalinity (15-80 mg/L as CaCO3) potable water? The pH test strips we are using have a note that they tend to read low in water with Total Alkalinity < 80.
Thanks much,
Robert
BronYrAur and EnergyProfessional,
This is a sub-slab depressurization system installed as part of a new building to mitigate vapor intrusion from VOC contaminants in the groundwater. Suction fans on the roof connect to vent risers that extend down into a 1' thick gravel layer below the slab on...
Quark, thank you!!!!!!!!!!! Katmar, thank you as well!!!!! Thanks to all that responded to my post. So obvious now. Ultimately I wanted to view pressures in terms of H2O though the calculation is for air flow and totally overlooked that this conversion was needed.
Hi Chicopee, I have a 6" round cast iron duct (absolute roughness used is 0.00085 ft). The length is inclusive of the pipe runs and the fittings (equivalent fitting lengths from ASHRAE are used).
Hello EnergyProfessional, the application is that I need to ventilate a gravel layer below a...
Hello Mechanical Engineers,
I am working on a venting system and attempting to calculate head losses through the vent piping due to the friction of air flow. I don't have any issues with getting the Darcy Friction factor (using Churchill equations). My issue is that the Darcy-Weisbach...
Bimr, I have heard from some consultants that ion exchange would be more economical than RO in this application. I would really appreciate some numbers or documentation to back up your statement. Thanks again!
Thank you both for the responses!
bimr, the documents you have provided have proven very useful.
I would like to explore the option of ion exchange. EIther cation, anion or some combination of the two to reduce the Chloride and hardness levels. Do you have any experience with such systems...
bimr, I noticed publication that you referenced had some great information for other crops, but how do they scale/equate to just plain old turfgrass? I was also wondering where you go the 5,000 gpd / ac for the turfgrass? Thanks alot.
Thank you for the feedback. I've gathered that RO membrane systems can be very costly, would you agree? Would lime water softening might help with the Cl- levels? I would like to start pricing some of the different options.
I am conducting a feasibility study for the beneficial reuse of extracted urban groundwater for the irrigation of turf grass with some deciduous trees. The approximate coverage area to be irrigated is between 100,000 and 200,000 sf. Though the extracted groundwater is from inland Brooklyn, NY...
