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  1. kmer

    Window Leakage (Water) Test by CSA A440 Std - Minimum or Prescription?

    Window manufacturer, XYZ, claims their windows meets "B-7" (700 Pa) water leakage and has documentation to prove it. CSA standard guideline suggests minimum requirements for general application are only "B-3" (300 Pa). (B-7 is the highest rating that CSA standard tests to.) Standard suggests...
  2. kmer

    Coating vs. Lining w.r.t. Pump Columns

    I'm hoping to settle a dispute over the definition of the word "coating" and "lining" as they relate to pump columns. An addendum was issued simply stating the pump columns had to be epoxy 'coated'. No further clarifications were requested. There was no mention of whether it was interior only...
  3. kmer

    Pitting on Al Tank Walls - Anthracite?

    I didn't know for sure, however, did speculated that it may be abrasion from the air scour. It was also suggested to me to consider chemical reaction with impurities in the aluminum. I'm inclined to go with the former based on your information. The link was also very informative. Thanks, Kmer
  4. kmer

    Pitting on Al Tank Walls - Anthracite?

    The interior tank walls (5058H116 Aluminum) of a conventional filter are deeply pitted. The pitting seems to be mainly just above or right at the anthracite (top) free surface. The pitting is generally conical in shape. Diameter 0 to 12mm and 0 to 2 or 3 mm deep. The tanks are 10 years old and...
  5. kmer

    Aluminum 6061T6 vs 5086H116

    This is what I'm counting on... "Also, strengthening due to cold work (H116 of the 5086) & heat treatment (T6 of the 6061) is lost. Generally, one uses the annealed property values for each alloy." 5356 filler-alloy will be utilized, first to repair the cracks. Then to add 1/4" plate...
  6. kmer

    Aluminum 6061T6 vs 5086H116

    Thank you. This is exactly what I'm looking for. Very helpful. Cheers, Kmer
  7. kmer

    Aluminum 6061T6 vs 5086H116

    We have an existing tank constructed of 5086H116 Aluminum Alloy. The material is a week away from the US. Cracks have developed in the welds of a 10 year old water filtration unit. Welders are prepared to make the repairs to the welds, however, they need permission to utilize 6061T6 (readily...
  8. kmer

    Spectrophotometers: opinions on trading up

    Seems that the cost of consumables is a major consideration. I was completely unaware of the shelf life. Really appreciate your replies folks. Very helpful. Kmer
  9. kmer

    Spectrophotometers: opinions on trading up

    We have a Hach DR2000 Spectrophotometer (new in box, circa 1995) and am considering trading it off for a portable unit - a 'WaterPOINT 870' by Sensicore. I am a little green regarding in the operator-wise benefits of either machine. Would appreciate any opinions on whether or not to consider...
  10. kmer

    Corroded bare steel pump columns filtered/chlorinated water

    I didn't think of that aspect. Thanks. Kmer
  11. kmer

    Corroded bare steel pump columns filtered/chlorinated water

    Thanks for your reply EdStainless. So you've touched on the concept that I'm trying to explain to the conrractor. I'm still at a bit of a loss for the right words. The best way I can put it is that the original surface was 'compromised'. In my mind, it's like the tight-grain steel surface is...
  12. kmer

    Corroded bare steel pump columns filtered/chlorinated water

    We have new vertical turbine pump columns (installed a year ago, and finally put into service about two months ago) that are badly corroded. The columns are bare steel (no lining). They were installed in a new water treatment facility about 14 months ago, before the building was finished. The...
  13. kmer

    Limits of Directional Drilling: Doomed?

    Using a Ditchwitch JT2720, several attempts to directional drill beneath a railway have failed. The plan was to install a 9" steel casing for an outfall pipe to the lakeside of the tracks. The drill rig is equipped with a 5" bit. The minimum depth required is 2.4m. The length of the run is...

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