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  1. matschka

    Governing Thickness for Welding a Sockolet on a Blind Flange per ASME B31.8

    Were these fittings welded on in position with the blind flange bolted up or were these fittings welded onto the blind flange in the shop. Just curious???
  2. matschka

    Pics of pipe or vessel failures

    The book by Thielsch, recommended by MJC is an eye opener.This book all though dated is a complete Encyclopedia of pressure parts failures see in the industry of power, chemical, & oil. Detailed to the explanation of weld defects, material defects and all types of stress, and many photos to...
  3. matschka

    ASME (In Service )weld requirement

    Check ASME SEC. XI
  4. matschka

    New Nuclear: Russia reaches milestone with Kursk II RPV

    Interesting article in WNN DAILY, World Nuclear News, Feb.3, 2020. Welding, PWHT etc
  5. matschka

    NDE to detect corrosion under riser clamp

    Years ago I coordinated and supervised a team of NDE techs at a major oil refinery in the Bay area. We were tasked with inspecting existing pipe to determine the extent of corrosion both inside and outside of the pipe. We used two,(2), NDE methods, UT and RT. The UT was used first to detect...
  6. matschka

    What kind of defects are these?

    IMO: In the 1st set of pictures the two areas of concern look to be where an angle or fit-up attachment was welded and then removed by hammering causing the base material to be 'ripped' out. We have welding standards now that prohibit this type of removal because you will cause a 'pull out' of...
  7. matschka

    DOME Roof Layout

    Google: 'tank dome roof layout'. You will find plenty of good information.
  8. matschka

    Striking to shear tack weld - would this affect the integrity of the steel?

    The welding standards of my previous contractor, B.....l instructed the craft to avoid striking directly a bracket that was tack welded as this method would pull out some base metal and then this would have to be weld repaired and of course NDE'd. They instructed the craft to grind a...
  9. matschka

    In the March, 2019 AWS Welding Jour

    Thanks XL83NL, I will try to figure out how to do that?
  10. matschka

    In the March, 2019 AWS Welding Jour

    In the March, 2019 AWS Welding Journal page 44 the following: 'Investigation of a Ruptured Socket Weld in Sour Service'. Very interesting. It looks like they welded a weld neck flange into a SW valve? The SW was a single pass?. 'Table 4'? I have some questions but thought I would just throw this...
  11. matschka

    Root Weld of Super Duplex

    I suggest you use a carbide rotary burr of the highest quality instead of grinding SS,inconel,CU/NI or duplex to remove any hint tint and to make any cosmetic repairs. As EdStainless has said 'when you grind you just embed the oxides into the surface'. This is why I always have my welders 'hand...
  12. matschka

    Cooper/Nickel (Orbital)

    Hydrogen is a reducing gas, the weld surface produced by hydrogen addition to argon is in both cases very clean and without oxides.
  13. matschka

    The HTGR, (unit 1) at Peach Bottom

    I assume you are interested in the photo which shows the large buckle in the lower shell and the large straight edge which was used to confirm this buckle. I will look for this picture in my families albums and at the same time I will check to see if it is restricted to show it. I will also...
  14. matschka

    The HTGR, (unit 1) at Peach Bottom

    This Unit 1 at Peach Bottom was a HTGR reactor. The site has been demolished for some years now. Their are 2 more General Electric boiling water reactors running there now. Those horizontal rings which you see T-beams. The verticals between the horizontal T-beams are stiffeners. The containment...
  15. matschka

    The HTGR, (unit 1) at Peach Bottom

    YES
  16. matschka

    WQT per ASME sec IX

    Wow, everybody seems to be onboard with this one, that's great. Although the code is a little lacking in visual inspection criteria, my company uses approved welding specifications / standards that are a little above the code requirements for welding and rest assured that visual weld inspection...
  17. matschka

    The HTGR, (unit 1) at Peach Bottom

    The HTGR, (unit 1) at Peach Bottom Pa with its ornamental steel containment vessel was almost a vessel failure. The original design for the containment vessel was for a straight wall vessel up to the dome.If you can find some pictures of the completed vessel, you will see that it has many...
  18. matschka

    WQT per ASME sec IX

    QW-320 & 321 provides this information, which is summarised below: Immediate Retest Using Visual Examination A welder who fails to satisfy the visual examination criteria for a welded test coupon is allowed an immediate retest but must make two consecutive test coupons, for each test position...
  19. matschka

    Ultrasonics testing ASME section V

    Do you have an approved NDE procedure for ultrasonic testing?
  20. matschka

    Handling of sugar cane trash to be used as fuel in boiler

    I suggest you go to the following for some good information about this subject: pdf.blucher.com.br.s3.amazonaws.com/openaccess/sugarcane-bioethanol/SUGARCANEBIOETHANOL_56.pdf Hope this helps.

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