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Recent content by mshimko

  1. mshimko

    Coal Tar Expoxy Performance

    The most important factor, IMO, in coating performance is the quality of the surface preparation and environmental conditions dutin coating application and cure. Perform a high quality surface prep, and you should be able to get 10 - 20 years of service. BUT, just try to convince the folks...
  2. mshimko

    NACE Corrosion Specialist

    I took and passed the examination (both the Material Selection/Design and Corrosion Specialist) more than 10 years ago. I found the examination (and the lead-in requirements) to be basically equivalent to a PE examination (which I passed almost 30 years ago). Is it useful? Hard to tell. I...
  3. mshimko

    Material Selection for Submersible Centrifugal Seawater Pump

    I echo ed's comment above, with my rewording: must ensure all materials are galvanically compatable, and if not IDENTICAL, then ensure the larger parts are slightly less noble compared to the smaller parts. As to materials, my experience starts with CuNi and bronze as a low end option...
  4. mshimko

    Wedge Tensile Testing of Fasteners

    For TVP: You're confusing PROOF load testing with YIELD testing (which, BTW, is the same arguement this supplier made). My question pertains to wedge tensile testing AFTER a speciman had been YIELD tested.
  5. mshimko

    Salt spray test verses real world performance for various types of corrosion protection?

    Regarding: "I have looked at various other bolt coatings claiming high corrosion resistant, i.e. Geomet, Dacromet, Ultra Corrosion Resistant etc. All of these have displayed images of 1000 hour salt spray tests indicating they far out perform hot dipped galvanized. I would have taken this to be...
  6. mshimko

    Wedge Tensile Testing of Fasteners

    I've a couple of fastener suppliers that are claiming it's technically acceptable to perform wedge tensile testing (IAW ASTM F606) on a fastener that had been previously yield tested (but not to failure, obviously). My position: yield testing of a fastener imparts at least limited work...
  7. mshimko

    Stray current corrosion

    The only way you can get that type of corrosion from "stray currents" (assuming your boat/slip isn't a source for the stray current) is if there is a sufficient potential difference from location to location. If you have acccess to a "dip cell", you can take a "hull survey" around the boat and...
  8. mshimko

    Presentation vs. Training

    Back to the original posting from ZDAST04; The original posting reminded of two past experiences; both occured right before I retired from the military as was open to "ALL" opportunities: (1) An "AMWAY" rep mentioned a business opportunity he thought I would be interested in. Turned out it...
  9. mshimko

    Is Hot Dipped Galvanized Necessary For Submerged Steel Shackles

    Galvanizing provides what is essntially a very thin sacrificial anode, with the emphasis on "very thin". The service life of sacrificial anodes (in this case - galvanizing) is determined (partly) by the mass of anode material. Since galvanizing provides a very thin layer, with little mass...
  10. mshimko

    Conern with machined flanges, possible stringers and defects

    For salmon: The flanges we're questioning have already been welded into their applications, some have been in service for over 7 years. Any flanges not welded in place when the issue was identified were returned to the vendor. The issue isn't if the provided products meet our specs, (they...
  11. mshimko

    Conern with machined flanges, possible stringers and defects

    Providing a little additional info (for grampi1 and others): We've already conducted a little testing on bar stock material; we had an independent inspection lab UT a sample of bar stock (don't recall the acceptance criteria off the top of my head, but "it passed"); and we also took a...
  12. mshimko

    Conern with machined flanges, possible stringers and defects

    I’ve a situation where C-steel flanges to ASTM A105 are required to be manufactured from individual forgings; however, we’ve discovered (AFTER the fact, of course) that one vendor did not properly read our procurement documents and as a result we have flanges that were machined from either...
  13. mshimko

    ultrasonic antifouling. Is it effective ?

    Several companies tried to market this BS to the US Navy several times over the past several decades. For numerous reasons, it's a non-starter. Bear in mind these points before you invest a dime: - what evidence is there that the frequency the equipment operates at works for a wide range of...
  14. mshimko

    Climatic Weather Conditions

    If you are tasked to evaluate the heat load, didn't the tasking contain parameters?
  15. mshimko

    Non-sparking materials?

    Almost nothing is "non-sparking". One company conducts tests to determine what kinetic energy (i.e. a fall from what height) can produce significant sparking, and designs/guidance are prepared accordingly.
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