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  1. Subystud

    City Water Storage Tank

    I'm installing a 10,000 gallon city water storage tank. I am planning on including a 20gpm UV filter constantly recirculating the tank which will cycle the tank contents ~3times per day. Is this unnecessary as the city water has residual chlorine? Or recommended as the tank is just sitting there?
  2. Subystud

    Cooling Tunnel Design for a continuous manufacturing process

    Hello, I was tasked with assessing a specific cooling tunnel (used equipment, seeing if it will work) for our manufacturing process. The cooling tunnel is a refrigerated cycle blowing cold air in an enclosed space. The conveyor serpentines within the tunnel. So the mechanism of heat transfer is...
  3. Subystud

    Kettle Manufacturers?

    I work at a plant with a cosmetics process and we need jacketed kettles. I currently have a quotation for a 1000 gallon double motion kettle from Lee Industries. Could anyone recommend any other manufacturers for this type of equipment? Thanks, Rob
  4. Subystud

    Is this pump motor 60Hz or 50Hz?

    So the motor rating is shown with 6 different voltages and 4 different frequencies. But then at the bottom states "50Hz: IE2-87.7 (100%)". I'm in the US so trying to wire to 460V/60Hz/3ph. Can this motor be wired for 50 Hz or 60Hz? Now, if a variable frequency drive is used, the 50Hz or 60Hz...
  5. Subystud

    31.1 NPSHr . . . too close for comfort?

    Artisi: here's my cost over one year considering 7,000 hrs/yr and $0.08/kWh 50hp (45.46 hp rated power) $19,984/year 60hp (49.26 hp rated power) $21,655/year So the 60 hp variety cost $1670 more per year to operate versus the 50 hp. The 60 hp costs $4500 more than the 50 hp. I don't...
  6. Subystud

    31.1 NPSHr . . . too close for comfort?

    and the 50 hp pump curve. http://files.engineering.com/getfile.aspx?folder=bd22f0fc-e84b-49ad-afe8-db02bba7adc6&file=50_HP.pdf
  7. Subystud

    31.1 NPSHr . . . too close for comfort?

    Pump skid mounts directly to the tank skid and both sit on the ground. It's not possible to adjust the height of the pump. I can easily get 3' above the centerline of the pump, so 3' liquid level above pump centerline is what we should assume. 33.9'+3' = 36.9' NPSH available. See pump curves...
  8. Subystud

    31.1 NPSHr . . . too close for comfort?

    Pump application has me at 31.1' NPSHr for a 50hp, or $4500 more for a 60 hp variety with 18'. Application is a hydronic 35% glycol loop recirculating out of an open tank. Level in the tank from pump centerline is atleast 2', adjustable up to 4'. Suction is ample at 4 ft/s up to pump...
  9. Subystud

    Industrial Water-Cooled Chillers -- Evaporator Side question.

    Hello, Heard something interesting from a chiller rep in that the evaporator-side piping is interchangeable -- heat transfer would still be the same. This is NOT true for the condenser side, this does have a specific piping configuration. So it got me thinking the following: From a physical...
  10. Subystud

    Pressure Drop through a low-pressure Air PVC Piping System

    Interesting. Thank you very much, katmar. I have built up a test rig from parts laying around. I will report back with the test results, though your preliminary results makes it seem like it's not going to work. So, if you take a centrifugal blower to shut off head, what happens? Does the wheel...
  11. Subystud

    Pressure Drop through a low-pressure Air PVC Piping System

    Edit: the Cv value is 130 and the flow of 130 gpm through a 3" cross section is 5.9 ft/s, but I listed the flow as 155 gpm in the thread. This is a mistake. Cv = 130 and v = 5.9 ft/s at 130 gpm is the correct values
  12. Subystud

    Pressure Drop through a low-pressure Air PVC Piping System

    Hello. I my question is regarding sizing of a blower for an air flow application. The system is as shown in the attached. My question is regarding my method of calculation. There is a 3way 3" valve in the system and the Air enters the branch portion and must either be directed left of right...
  13. Subystud

    Annual Goals

    I think all the suggestions above are valid. I am in a similar situation as you and had some of the same questions and issues regarding quantifying results. Maybe you should consider more qualitative assessments of your progress. Personal example: The only work environment I've known is...
  14. Subystud

    Vacuum Relief Valve: maximum vacuum a tank can handle

    An inverted check valve is used for vacuum relief of a pressure vessel during emptying of the tank. What would be a recommended maximum vacuum for purposes of selecting a check valve? The operating pressure is 35 psig, the tank will firstly be depressurized, and then emptied. The...
  15. Subystud

    Tank question: gas dissolved in solution adds to volume?

    Do gases dissolved in a liquid increase the volume of that liquid? System: The system considered in an 11,000 gallon tank. 10,000 gallons are liquid, 1,000 gallons are "headspace". Initially, the system is at neutral pressure. System is sealed and chemical is added (30 gal). System is regulated...
  16. Subystud

    Diluting Sulfuric Acid: Fuming

    Thanks for the response. For reference, it was in Florida. It was 50F ambient, and 100% humidity.
  17. Subystud

    Diluting Sulfuric Acid: Fuming

    The 98.7% acid is not fuming. I have 500 mL of DI water in an ice bath on a stir plate. I am adding 450 mL of 98.7%. I slowly add via a 1L graduated cylinder in to the DI water. When even small portions of 98.7% are added, it fumes. What is this fume?
  18. Subystud

    Diluting Sulfuric Acid: Fuming

    When diluting 98% sulfuric acid it fumes. What is this fume? H2SO4 as a vapor? SO3? H2O?
  19. Subystud

    Handling of dewatered sewage sludge

    Got a simple process flow diagram? A sketch would suffice. For transfer, a shaftless screw conveyor works. "Cake pump" could be an option, too. A seepex progressive screw pump with an open hopper feed will transfer the biosolids, but I wouldn't recommend pumping over 300' with this setup.
  20. Subystud

    design of a digester tank

    I'm assuming you're designing an anaerobic digester. Can you answer the following: - Throughput (lbs/day, GPD) (what flow needs to be handled?) - Biological Oxygen Demand of the feedstock - Makeup of feedstock (industrial? Municipal) - Desired solids retention time (days)

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