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Recent content by cod

  1. cod

    API 500 Classification Rules - Interpretaton

    I'll go back to my previous example where multiple flanged pipelines are installed on a trestle with overlapping flanged sections. Yes, there are many spark producing items that would be on the trestle including vehicle engines of all types, employees with un-approved equipment (flashlights...
  2. cod

    API 500 Rules Interpretation

    Our company does a good deal of work on marine termianls handling petroleum and its products. Sometimes the API rules are very difficult to interpret in view of reality. Consider API 500 Figure 96 where it is stated "Outdoors - Piping with Valves, Screwed Fittings, Flanges or Similar...
  3. cod

    API 500 Classification Rules - Interpretaton

    Our company does a good deal of work on marine termianls handling petroleum and its products. Sometimes the API rules are very difficult to interpret in view of reality. Consider API 500 Figure 96 where it is stated "Outdoors - Piping with Valves, Screwed Fittings, Flanges or Similar...
  4. cod

    Grounding Electrode Conductors in Multicore Cables

    Thanks Bill for your reply; The actual design wasn't fully described in my message. What we are doing to serve the large 1-phase 480-volt transformer is to use a 4/c cable with two of the conductors paralled, then to parallel this cable with a second one that is the same. Thus we have 8...
  5. cod

    Grounding Electrode Conductors in Multicore Cables

    A marina floating dock with a large 1-phase transformer is being fed from shore two multiconductor cables each of which incorporates 4-#1 bare ground conductors (83,690CM each). The transformer secondary neutral must connect to an electrode grounding wire that in this case must be sized as the...
  6. cod

    Best Coating for Steel in Tidal Zone

    Regardless of cost considerations, what is the absolutely best protective coating for a trussed steel structure in the tidal/splash zone? This horizontal structure is a beam that will be partially immersed a low tide and 3/4 immersed at normal high tides and sacrificial anodes will be applied...
  7. cod

    CP Design in Variable Salt Water Concentrations

    We are designing a sacrificial anode type of cathodic protection system for a sheet pile wall in an estuary that changes salinity according to the seasons. Salinity values range from a minimum of 1 ppt to a maximum of 20 ppt. The problem arises because the low salinity periods can last for up to...
  8. cod

    Electrical Duct Bank Calcs

    Still another twist; what happens if the ductbank is below the water table as it may very well be at 35' or even 10' in certain areas? I believe that a certain natural flow of water would normally occur plus a flow that would be brought about by convection currents. Any flow at all would carry...
  9. cod

    Electrical Duct Bank Calcs

    B310.60.C.(2)b states that for deeper portions an ampacity derating factor of 6% per foot shall be permitted. Based on this, cvirgil calculates a derating factor of 2.1 which indeed doesn't sound right. Put in another way, if a cable is installed in a duct 16.6-ft deep it will have no rating...
  10. cod

    Footprint for Very Large Combined Cycle GT Set

    An assiciate has asked me what the area might be required for one each very large combined cycle gas turbine generator setup, i.e., what its footprint might be. He wants a figure for the largest GT-C unit available. I have seen 300 and 500 MW units described on the Web but since I very seldom...
  11. cod

    Corrosion rate of steel in saltwater

    Ipm-46; Can you advise the address (URL) where the British Steel Piling handbook is located on the net? I would like to see a copy of it. Thanks C. Daniell
  12. cod

    ACAD 2000 Printer Compatibility Canon 9000

    CntrlEngr: Thanks for your reply. I think that answers my question and I will probably go ahead and give the S9000 a try. After long searches on how to contact them, I finally got an answer from Canon. Here is a part of what they said, verbatim; Quote Unfortunately, the Canon S9000 Photo...
  13. cod

    ACAD 2000 Printer Compatibility Canon 9000

    I am contemplating purchasing a Canon 9000 wide format (11x17) inkjet printer and wonder if anyone has had any difficulty in printing from ACAD 2000 to this type of printer. This printer is primarily a photo printer, certainly not specifically made for CAD work, although it does incorporate a...
  14. cod

    Combining SW & FM Antenna Coax Leadins

    Decision made! I bought a TV "Cable-Antenna" Switch at HOme Depot and it works as expected. I tried to see if there was any diffeence in the signal to the radio by first using the switch and then reconnecting without the switch in the circuit. I saw (heard) no difference in either...
  15. cod

    Combining SW & FM Antenna Coax Leadins

    VE1BLL Thanks for your thoughts. Yes, the FM station is a little 500W affair run by high school kids that has the best music in the world (for an old timer. The station can't be received without the dipole on most days and the SW antenna on FM doesn't cut it. So I have to have them both. Yes...
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