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  1. Gungadin

    Recommended Coating for Steel Shafts in Chlorinated Water?

    Thanks guys, The shafts do rotate slowly, the paddles are FRP, andthe liquid is lake water. The shaft sections are held together by compression couplings. The end of the shaft assembly passes through a wall (with a seal) where it is driven by a gear and chain off a motor. What is the...
  2. Gungadin

    Recommended Coating for Steel Shafts in Chlorinated Water?

    Howdy folks, I have a project at a municipal water filtration plant (I'm one of the public works engineers) - the flocculator facility makes use of submerged steel shafts (4-7/16" dia.). The water is slightly chlorinated, and comes from a reservoir/lake. I'm quite ignorant when it comes to...
  3. Gungadin

    Electropolish vs. Pickle and Passivate?

    UncleSyd - is the Shelia Shine a clear coat protective finish suitable for outdoor exposure? What's your experience with its longevity? Thanks!
  4. Gungadin

    Electropolish vs. Pickle and Passivate?

    Thanks McGuire - I read in another thread (338-65804, "pickling and passivating)that wire brushing/mecahnically abrading the SS surface can have a detrimental effect on corrosion resistance - if so, is that alleviated by subsequent electropolishing? Thanks again, John
  5. Gungadin

    Electropolish vs. Pickle and Passivate?

    Howdy folks - I'm hoping to get a basic understanding of the difference between electropolishing and pickling/passivating. I have a number of SS louvres (4' x 1'6", 316 SS) which are installed in a water tunnel portal building, and exposed to high humidity from slightly chlorinated water...
  6. Gungadin

    Ozone/bromine vs. chlorine dioxide

    Hi ProjEng, I work for a medium sized utility department, and we are currently reviewing alternatives to liquid (pressurized) chlorine for our water treatment plant. We currently peak at about 90mgd. Our biggest concern with liquid chlorine is safety issues - functionally, it does a great...
  7. Gungadin

    Submerged HDPE water pipe costs?

    Hi, I need to come up with some budget level unit costs for installing a 24-inch hdpe in a lake - depth would be up to about 60 feet, length would be on the order of 1,500 feet - anyone been through this sort of project? Thanks!
  8. Gungadin

    Pros/Cons of Hydrostatic Dished Head Steel Pipe Test?

    Hi - I'm hoping to get some input on the pros cons of hydrostatic dished head testing for steel pipelines. Thanks!
  9. Gungadin

    Corrosion of SS fixtures in water valve house

    Thanks again, McGuire - what's the most appropriate method to sample and test for sulpher in SS?
  10. Gungadin

    Corrosion of SS fixtures in water valve house

    Are there special considerations regarding pickling and passivation on parts 'in-place'? If the fixtures cannot be removed from the humid environment, are there additional measures required? Thanks!
  11. Gungadin

    Corrosion of SS fixtures in water valve house

    Thank you - does the paste serve to bolster the surface layer of the SS by leaving some coating or material, or is it rather repairing the SS natural corrosion resistant surface? can you suggest a few paste products? Thanks again!
  12. Gungadin

    Corrosion of SS fixtures in water valve house

    Hi - we operate a number of valve houses for a large water transmission pipe system. Upgrades at one valve house included fixtures (wall vents, louvers, doors, railings, electrical enclosures) constructed of 316 stainless steel. All of these fixtures are showing some degree of corrosion (some...

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