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  1. compit

    Dry ice blasting concern on carbon steel

    @IFRs, thanks, I didn't miss that, my clients contractor has quoted weeks as opposed to what would be few days by conventional methods. The client may have been sold on the potential lower cost of waste disposal without the added weight of lead contaminated grit. @tugboateng, thanks, I've...
  2. compit

    Dry ice blasting concern on carbon steel

    Gr8blu Thanks for sharing, your comment on procedures to follow, particle size etc exactly highlights the need for proper procedures to be in place, which to me is where peer reviewed research or standards come into play to define what limits may apply. Unfortunately this dry ice blasting is a...
  3. compit

    Dry ice blasting concern on carbon steel

    What a great find ! Thanks for all the digging. Absolutely getting eyes on that Enspec report would be interesting, the test method as it is described in the Shell report is vague and leaves room for lots of potential holes. I think the next way I should approach this is by asking if anyone...
  4. compit

    Dry ice blasting concern on carbon steel

    He would be on full BA, all lead protocols would be followed, blood testing before after etc. I'd like to know more than that they have don't it before on other clients equipment, I want to understand the constraints before allowing something that brings even the surface of the steel (and...
  5. compit

    Dry ice blasting concern on carbon steel

    I'm not trying to pontificate, simply responding to someone trying to be helpful. I'm also not sure what kind of simple test you imagine that could accurately measure the surface temp of the first few microns of the plate or weld surface. What I was asking was did anyone have experience or...
  6. compit

    Dry ice blasting concern on carbon steel

    Thanks for your thoughts, though I am not sure where the heat you mention would come from, if anything I imagine the phase change of solid dry ice to gas would make the surface even cooler than the temp of the dry ice. I read this (from the above link) and can imagine negative side effects in...
  7. compit

    Dry ice blasting concern on carbon steel

    Hi All, I have a client’s supplier who is proposing to to use dry ice blasting to remove a leaded epoxy paint from the internal side of a mild (0.3%) carbon steel vertical above ground storage tank. I have yet to come across dry ice blasting. My initial concern is that the process is quoted...
  8. compit

    Sample size ultrasonic testing

    If you look to API 653 you will see that the quantity is laid out per section through a tank, not per plate and is determined by the diameter of the tank. I don't really understand where your margin of error figure comes from nor you formula but I can say that the time to take a single...
  9. compit

    ASME Plant Inspection Training and Certification

    In the UK there are courses offered as ASME Plant Inspector" in levels 1 -3. An excerpt from the training companies flyers reads, "and ASME certificate costs are included in the course fee. Looking through the ASME website and course lists for North America I cannot find this course listed...
  10. compit

    API 653 reference to ASTM A6

    In regard to API 653 "10.5.2.2 The out-of-plumbness in one shell course shall not exceed the values specified for mill tolerances in ASTM A6 or ASTM A20, whichever is applicable." Does anyone have experience with this? We have a large bulge (inward & outward)spread over many courses, using...
  11. compit

    Max allowable loads for brackets on tank shell

    As a tank inspector it is my experience that whenever a tank is designed with bracket welded direct to the shell, the exact location in regard to vertical and horizontal welds are not taken into account. As a result it can be common to find brackets welded inside the minimum permissible weld...
  12. compit

    Repads welded without telltale hole. How can we fix that?

    The secondary use of the tell tale is to allow site operators during routine maintenance inspections open the plus to quickly tell if the internal shell to nozzle weld has cracked. Product or water ingress which could lead to crevice corrosion can then be defected - as well as any defected weld.
  13. compit

    Horizontal stoarage tank saddle shroud

    http://www.sika.com/en/solutions_products/02/02a005/Grouting.html
  14. compit

    Horizontal stoarage tank saddle shroud

    You should talk to these guys....Sika they will for sure have a solution for you...probably a combination of their sikadur and sikaflex.
  15. compit

    Tank Bottom Flatness and Foundation Tolerances

    Take a look in API 653, there are tolerances for tank bottom flatness, bulges and depressions.
  16. compit

    UT of Carbon to Stainless Weld - Heat Exchanger

    Hi, We have the final closing weld on a closed heat exchanger to ultrasonically test. (There is no access for radiography.) We can not find any UT procedure to test this weld. There are obvious complications with the change in speed and interface boundary between the two materials so special...

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