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Recent content by hpsAP

  1. hpsAP

    bollards around diesel AST

    I am relocating a 12,000 gal. diesel AST to a different part of a facility. The tank is used for fueling tractor trailers. Is there a standard in Ohio that sets the number of bollards or spacing around an above ground diesel storage tank? Thanks hpsAP
  2. hpsAP

    Industrial Park Employee Population Density

    I am doing some development work for a proposed light industrial park. I would like to give an estimated statistic for the number of jobs that could be expected from development of a 50 acre parcel in west central Ohio. Is there a design number that is typically used? - or - where can I go to...
  3. hpsAP

    Sand Filter Air Scour Valving and check valves.

    I am working on an adding air scour to an existing rapid sand filter system at a water treatment plant. Because of the pipe configuration, I have very limited horizontal room where the pipe turns into the filter walls. Airflow will be controlled by a butterfly valve at each filter cell. Is a...
  4. hpsAP

    How to clean large diameter water mains?

    An alternate method to pigging is described at: http://www.severntrentservices.com/pipeline_solutions/water_services/airscouring.jsp
  5. hpsAP

    Best pipe material for filter air scour header pipe?

    I am adding air scour to an existing, rapid sand filter at a municipal water treatment plant. What is the best (or traditionally most used) pipe material for the air header pipe? The blower will be located outside in a small blower building. About 25 feet of pipe will be buried. Will need...

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