Tek-Tips is the largest IT community on the Internet today!

Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!

Register Log in
  • Congratulations TugboatEng on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!

Recent content by JEB66

  1. JEB66

    Ensuring protection under nitrogen filled carbon steel vessels

    If you have liquid water with free O2, then you will have localized corrosion on carbon steel. N2 is used to displace air and the O2 that comes with it. Usually a small cylinder of N2 is connected to the vessel with a pressure regulator to maitain a slight N2 pressure. If the vessel is...
  2. JEB66

    1949 Code Allowables

    Just to guess, someone died.
  3. JEB66

    Basic of Pressure vessel Design

    ASME has classes to teach you on how to use the code. These classes are about 4 days long. Go to the ASME website for more information.
  4. JEB66

    big problem in the boiler tubes..please help.

    You need to have the tubes exmained for failure mechanisum. The furnace manufacture can do this if you cannot do these inspections in house. My 1st guess is overheat. Heavy oxide scale on the ID with a thick edge failure. I would rune a boroscope up and down the tube to inspect for pluggage...
  5. JEB66

    carbon steel to stainless steel weld

    Besides EPRI, I do not know a data source from memory. But I can cretainly say there is a finite life for dissimiliar metal welds. In power plant application, we expect failures in as little as 15 years. Dependant upon temperature, cycles, weld prep and defects, some have lasted longer. But...
  6. JEB66

    power plant layup procedures

    Have you discussed how to ensure that these systems are completely dry? Any water left in the system will cause localized corrosion that could fail catastrophically. Drain lines, make lines... typically run through people space. If you cannot ensure complete drying, then then you could use...
  7. JEB66

    Sulphur content of fuel oil and superheater fouling

    The sulfur alone is not a problem for fouling. Has already written, it will be a problem with low temp corrosion, mainly with condensation of H2SO4. Maybe what your contract is thinking about is, in coal fired furnaces, people use sulfur has an indicator of slagging characteristics. As with...
  8. JEB66

    Maximum Recommended Boiler Tube Length

    Expansion
  9. JEB66

    H2S04 Compliant Materials

    A-560 Corten B would be a good material to use. It has the same weldability as carbon steel. In simple terms it is carbon steel with some copper tossed in. This has been used on chimneys for some time.
  10. JEB66

    Soot Blower Technologies / Clinker Prevention

    Slag formation is not an easy one to put black and with answers to. It is a combination of combustion, coal properties, operation and maintenance. central app coals are usually high fusion temp coals, but there are a few seems where the H=1/2 reducing temp are low, in the 2100 F range. That...
  11. JEB66

    304H oxide formation

    The problem goes back many many years. It is only going to happen on new tubes. When stainless is new it forms magnetite and hemitite oxides until the spinel layer takes over. If you have a new section and the boiler runs for a long period after the installation and as a trip. The early...
  12. JEB66

    304H oxide formation

    Normal routine for an outage where entry into the boiler is needed is to run the fans for cool down. This particular incident we had an upset after a very long run. The upset spiked the main steam temp down which we feel is the event which dislodged all of this at once. The thermal expansion...
  13. JEB66

    304H oxide formation

    Recently we had several Superheater overheat failurs on a new bank of tubes. The platens are made from SA213 TP304H. They are less than 2 years old. The failure is the result of severe exfoliation of the magnetite scale that plugged the tight radius bends and ID transitions. This stuff is...
  14. JEB66

    Co-Firing wood and Coal

    RMW, Can you give me a manufacture of the injetors you mentioned? The burners I have been shown are bigger than the coal coal burners, for the same BTUs. They are nice burners with spin vanes, dampers and diffusers, but big. As far as the back end. I have not seen any constituents that will...
  15. JEB66

    Co-Firing wood and Coal

    it is not just cabinets, it sawmills, pallets and other stuff. But we did go out 100 miles from the unit just to get the 10 % heat input. All of those trucks bringing in the wood will save the planet. If this comes to be reality, I do not know what I am gonna do. I have 40,000MW of coal...
See more

Part and Inventory Search

Back
Top