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  • Users: jpuy
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  1. jpuy

    Sprinkler & Standpipe Hydraulic Calculation

    thanks for the help. Appreciate it... one more thing... looks like there is a problem on this: 1. ordinary hazard 2. area of sprinkler - 139m2 3. density - 6.1 LPM (0.15gpm/ft2) 4.no. of sprinkler calculated - 13nos 5. max coverage per sprinkler - 12.1m2 6. total discharge through sprinkler -...
  2. jpuy

    Sprinkler & Standpipe Hydraulic Calculation

    Hi, Hope you can help me on this. As per NFPA 13, the most distant is not necessarily the HYDRAULICALLY most remote. How do we identify the most hydraulically remote if not the most distant? Appreciate any feedbacks. Regards, Jeff
  3. jpuy

    Rusted Ductile Iron Pipes

    Yes, pipe is located inside a chamber exposed in an open environment. Often times, the chamber is flooded due to groundwater ingress from chamber coverslab joints. (ie. poor water proofing) Thank you for the advice.
  4. jpuy

    Rusted Ductile Iron Pipes

    Sir, hope you can help me. What's the best approach to treat rusted ductile iron pipe? I have attached a photo showing pipe current condition. Many thanks.
  5. jpuy

    High Chloride in Stormwater

    Thank you for your valuable input. Appreciate the help.
  6. jpuy

    High Chloride in Stormwater

    Thank you for the feedback. Its a 215KW Pump and supplier confirmed duplex material used on pump material. We are much worried on the ancillary pipes & mechanical screen chains. I have attached actual photos to help you better understand the current scenario. Thank...
  7. jpuy

    High Chloride in Stormwater

    Hi,thought you might be of help. Picture a 5km man-made island with extensive stormwater network. At the moment, it is already operational. Open for public use. Currently, we are facing High Chloride (40,000-70,000 ppm) in stormwater that is showing potential major corrosion problem on our...
  8. jpuy

    Acid Resistance of Cast Iron

    Thank you for all your valuable information. @ swall, We have not obtain pH value. We concentrated on the TDS level only. At the moment, we are trying to locate the source of seepage in the network and apply chemical blasting method to seal it. Any opinion?
  9. jpuy

    Acid Resistance of Cast Iron

    Hi, i'm new to this forum. need help... We are unable to run our Sewage Treatment Plan Lifting Station at the moment due to high salinity/acidity content of water. (ie. Water TDS (total dissolved solids) = 5000ppm due to groundwater seepage). We are afraid that pump impeller (cast iron) will...

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