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Recent content by gvanbeek

  1. gvanbeek

    Composite/metallic shim in Ultrasonic Inspection

    Late to the discussion but here is some additional information: UT works on the reflection of waves at interfaces. How much is reflected is based on the difference in acoustic impedance of the material. Acoustic impedance= {density of the material} x {velocity of the wave in the material}...
  2. gvanbeek

    SS 316 vs SS 2205

    The orignal question was on increased cost. My cost info from July for unfabricated materials was: 2205 - $4.5 / lb, 2304 - $3.5 / lb, 316 - $3.5 / lb, 304 - $3.15 / lb, This should get you in at least the parking lot of the ball park.
  3. gvanbeek

    Piping for Mixture of Sulfuric and Nitric Acid

    Let me clarify that when I said shell I was referring to the pressure containing pipe that the Teflon would line not the shell of a pressure vessel.
  4. gvanbeek

    Piping for Mixture of Sulfuric and Nitric Acid

    Teflon lined piping would be my first choice. The shell can be carbon steel (painting issues, flange up keep), stainless or fiberglass (more expensive upfront, but depending on the size and operating environment may have a better life cycle cost).
  5. gvanbeek

    Spray-on Thermal Barrier

    If it is at elevated temperatures then these coating help to cut down on the radiation portion of the heat transfer: www.mascoat.com
  6. gvanbeek

    High-temperature resistant paint coat

    Silicone Coatings such as: Carboline Thermaline 4700 http://www.carboline.com/website/carbmsds.nsf/(all)/A86E188D77E10F008525705A00434C19/$file/Thermaline+4700+&+Alum+PDS+11-04.pdf
  7. gvanbeek

    CLEAR COMPOSITE MATERIAL

    The wetout properties of the reinforcement/resin will be critical. All you have to do is look at laminate made with chopped glass with too much starch on the fibers and compare that to a roving that has no starch and wets out almost invisibly.
  8. gvanbeek

    FRP Pipe Butt Join

    Some rough rules of thumb that you can use to check the thicknesses provided: 1. The weld thickness at least that of hand layup pipe and 25% thicker than filament wound for the same diameter. 2. For 150 psi rated pipe the width should be the larger of 8" or the nominal diameter (i.e. 12"...
  9. gvanbeek

    Barcol hardness of in-serivce FRP equipment

    Having personally inspected numerous chlorate tanks, I can tell you that it is common for the barcols to increase after being put into service. Most chlorate tanks are not post cured prior to being placed into service. Most Sodium Chlorate tanks (and especially those used for unloading...
  10. gvanbeek

    Solutions to paint corroded steel still wet

    For this application the best way forward is to just paint a little bit of the machine on each field day. Pressure wash the area to be painted. Use needle guns to clean the surface (soda blast, and dry ice are not as effective per our testing). Dry just the area to be painted, use plastic...
  11. gvanbeek

    NDE for a FRP tank?

    Pete: The following inspections can be performed: 1. External Visual (physical damage) 2. Internal Visual (physical damage or corrosion) 3. Barcol hardness (indication of chemical attack when compared to original installation) 4. Ultrasonic thickness (thickness if inner surface is no...
  12. gvanbeek

    Composites and Steel Truss Structure

    You should look at Strongwell (formerly MMFG) which can produce pultruded I-Beams up to 24". If I recall correctly they developed the large sizes for an NIST grant for offshore floating platforms where corrosion and weight were critical. Maybe you could get some strength and $ information on...
  13. gvanbeek

    6inch RTRP pipeline

    In addition to the bend radius for the pipe, keep in mind that socket (adhesive bonded) joints are weaker in bending as the adhesive is put into a peel condition.
  14. gvanbeek

    Best Pipe Material For Saltwater Service

    If the pressure is less than 150 psi, I would strongly consider FRP (epoxy, or vinyl ester) with butt and strap or mechanical joints (no socket/ adhesive bonded)
  15. gvanbeek

    GRP Road Tanker

    Corrosionman: AE must be performed by an experienced, qualified, & certified inspector. I am not sure what was the cause for the mixed results, but the fact that AE is a mandatory inspection technique for ASME Section X code vessels. I think that the fact that you presented AE as an option...
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