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  1. chemEIT

    HCL acid gravity feed

    I did a rough calculation using some assumed numbers. 6ft height totes raised to 10ft above ground level, 3/4" pipe size. The pressure drop comes out to be around 33 kPa. Is there any equation to calculate the flow rate from a outlet pressure/pressure drop thru the system?
  2. chemEIT

    HCL acid gravity feed

    We are planning to feed 30% HCL acid from totes using gravity. The required flow rate is 10 L/min. Could anyone suggest me the equations used to calculate the height required to achieve this flowrate and the pipe size.
  3. chemEIT

    HCL dosing

    Thanks guys for all the inputs. Does anyone knows of a deadman switch which can open/close a ball valve and switch on/off the metering pump at the same time.
  4. chemEIT

    HCL piping standards

    Could anyone suggest me the standards for HCl piping and pumping. We are planning to pump 30% HCL from totes to our fumehoods using metering pump and gooseneck. any suggestions are welcome...
  5. chemEIT

    HCL dosing

    thanks for the inputs. I have one question regarding the outlet pressure from the metering pump. Will there be a pressure increase at the outlet of a running metering pump if the outlet is closed by a manual valve??
  6. chemEIT

    HCL dosing

    HCL liquid needs to be drawn in from a tote and delivered to the fumehood intermitantly. Will a chemical metering pump be capable of such suction and delivery pressures. What kind of control valves should be in place.
  7. chemEIT

    HCL dosing

    We are trying to install a HCL dosing system from HCL totes to our fumehoods. Can anyone suggest a good dosing system for such application.
  8. chemEIT

    outlet composition from HCL tank

    Hi all, I need to calculate the outlet composition of gas coming out of a sealed HCL tank having an air inlet and an outlet. The temperature inside the tank is 20oC and pressure is at 1 atm. The tank is half filled with liquid HCL. I know the flowrate of incoming air. Any hints regarding this...
  9. chemEIT

    relative humidity calculation

    is there any way to calculate the amount of water in bio-gas having 90% relative humidity at 37 deg C and pressure above atomspheric??
  10. chemEIT

    polymer for sludge dewatering

    Could anyone suggest the best polymer to be used for dewatering hog manure sludge @ 15% solids. The sludge is coming out of a secondary digester. What type of polymer (dry, emulsion) proves best for dewatering??
  11. chemEIT

    Methane oxygen reaction

    thanks a lot for all your inputs
  12. chemEIT

    Methane oxygen reaction

    hi, I am in a process of justifying purging operation for one of our anaerobic digester. What are the chances of methane to react with oxygen to produce co2 and water?? one of my collegue thinks that methane being produced will react with oxygen to product carbon dioxide and water, so the...
  13. chemEIT

    Anaerobic digester accident

    hi, I am trying to get some info on AD accidents - most references I see talkabout the possibility of explosion, but I haven't heard of specific instances and I'm trying to get a handle on whether they are rare, extremely rare, never happen or happen more often than you'd think but aren't...
  14. chemEIT

    Anaerobic digester purge

    We have anaerobic digesters which require frequent maintenence activities. Has anyone heard of purging the digester tanks?? Our concern is to reduce the oxygen content in the digester below the explosive limit. One of our senior engineer has the view that in a digester system the explosive range...
  15. chemEIT

    Polymer addition system- dewatering

    thanks bimr, I did some calculation using 4 lbs/ton polymer dosage, I got around 24 kg/day active polymer or 97 kg/day concentrated polymer (assuming 25% active content) and 20,000 kg/day or 20 m3/day of dilution water @ 0.5% dilution. I feel that the amount of dilution water is still too...
  16. chemEIT

    Polymer addition system- dewatering

    we are trying to increase the solids content of sludge from 15% to around 30/40% using a polymer system along with a dewatering equipment. we might use a inline mixer (http://www.wateronline.com/content/productshowcase/product.asp?docid=6eb4b766-a1a5-11d3-9a73-00a0c9c83afb) or a seperate mixing...
  17. chemEIT

    Polymer addition system- dewatering

    We have 82,000 kg/day @ 15% solids sludge to be dewatered. According to recommended range of 15 lb/ton, we will need 91 kg/day of active polymer or 365 kg/day of concentrated polymer (assuming 25% active). At 0.5% dilution, we will need around 73,000 kg/day or 73 m3/day of water. This number is...
  18. chemEIT

    Polymer addition system- dewatering

    We are currently involved in a feasibility study for a hog manure treatment plant utilizing primary and secondary anaerobic digesters along with a dewatering option. The sludge from secondary digester is 82,000 kg/day @ 15% solids. we are planning to use a cationic polymer, 10lb/ ton DS for...

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