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  • Users: gerhardl
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  1. gerhardl

    Cordit???

    What is cordit? Ny brother is writing the historie of Norwegians post uniform. From 1935 the CAP visir EAs supplied in cordit (replaced treated leather). We suppose this to be a tradename for a more precise chemical composition name.
  2. gerhardl

    What is it all about

    Trying to grasp the idea of this forum and connect it with my own feeling that this is a hot trend important to follow up, I fell back to the Wikipedia definition : https://en.wikipedia.org/wiki/Internet_of_Things More important developments than we can imagine are just now cropping up, hidden...
  3. gerhardl

    Polyurethane bonding and strength as concrete joint repair.

    I need to find a way to prove (or disappprove) that a proposed repair method with polyurethane for a damaged concrete joint is strong enough. (How do I evaluate the strength of PU, or the complete joint?). The joint is an existing, damaged expansion joint in a parking deck supported on...
  4. gerhardl

    Concrete repair with epoxy compound and strength calculation advice

    What is the best way to repair below described case. What is the simplest way to calculate the strength of the repair? My role is to discuss this with a consultant/building specialist who is doing the calculations. Case: The top deck of an all concrete parking house, with only one lower parking...
  5. gerhardl

    Main elecrical transfer lines: masts or buried? Underwater/overwater?

    This is meant as an environmental question, future oriented. As a mechanical engineer, with only very limited knowledge of technology for electrical transfer lines for electrical high-power long distance power transfer and engineering, I have experienced an ongoing debate in my own country (in...
  6. gerhardl

    Hub motor 250W 12V DC for electrical bicycle?

    Is it possible to find a hub motor for an electrical bicycle utilizing (existing construction of) a 12VDC battery? The discussion came up as a side issue of possible utilization from a producer/developer/inventor of alternative power sources. Having looked at existing solutions most...
  7. gerhardl

    Epoxy coating temperature resistance in practice - knife gate valves

    Anybody able to help with comments or examples on practical upper limit for application of epoxid coated knife-gate valves for liquid fluids? 70 degress C? 120 deg C? Product datasheets give 120 deg centigrades for the (EPDM) sealings on the knifegate. However the epoxid layer of 200-250my...
  8. gerhardl

    Lackable dismantling joints - leakage and testing.

    A couple of years ago a customer of ours was involved in a case where a new installation of a larger water main (800mm) with different dismantling joints at different pressure classes, was trial tested with water. Several of the dismantling joints, in this case lockable pipe connections, where...
  9. gerhardl

    Plug cleaning/pigging of 2" pipeline 10 bar with obstructing valves

    Problem: 2 inch (DN50mm, PN10) pipeline with knife-gate valves, valves obstructing pigging, damaging pigs in a heat exchanger for sludge (waste water) sterilizing. Anyone with experience or suggesting of better/best suited type of pig? Background: By pigging the line after washing, pigs...
  10. gerhardl

    New trend? Missing technical descriptions!

    A lot of the technical inquiries and technical questions landing on my disc presentday (including questions from this website) seems to miss the fundamental understanding of what you actually need to answer a technical question. Typical is generalizing with 'small', 'large' etc instead of exact...
  11. gerhardl

    Manufacturer of DN50, PN40 trunnion mounted Ball Valves ?

    I need a few DN50, PN40 (European norm is a requirement) flanged trunnion mounted ball valves, preferably all stainless, but steel body is also accepted. (For coming projects also same in DN50 to DN100, and PN16 to PN64.) I have found a couple of possible suppliers, but the problem is...
  12. gerhardl

    Fixed cone (Howell Bunger) valves. Small and cheap? Bypass outlet .

    Fixed cone (hollow jet) Howell Bunger valves (or equal functioning valves) in smaller and cheaper sizes? Does this solution exist? I have searched the net in vain to try to cover following concept: Application: bypass of dams and hydroelectrical generators to supply minimum required water to...

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