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  1. KM

    Continuing education - thread about good courses

    Am hoping this thread would be a collection of good continuing education courses. I was pretty weak on the electrical side, and I just finished the distance ed. electromechanical technician certificate through George Brown College: http://www.emcourse.com/ It's nominally a 34-week thing, but...
  2. KM

    How to predict if galling will occur?

    We will be getting a new dam gate almost three times as high as an old one we already have on another dam. The detail we use to seal the existing gate on each side (where it meets the steel gain in the pier) is a stainless steel seal tube attached to the gate (hanging vertically from a chain)...
  3. KM

    Relative merits of different types of mechanical soft-starts

    I want to provide a more gentle start to a machine via some type of fluid coupling or other mechanical soft start mechanism in order to protect the gear train "downstream" of a motor from torque shocks. The machine is a stoplog lifting crane on a dam. The mechanism, although sheltered from...
  4. KM

    Thoughts on weld repair of cast gears

    We've got a machine that is almost 100 years old, to be scrapped at most 5 years hence, but to be operational until then. Intermittent service two or three times a month, for a couple of hours at a time, but lots of starts & stops. The power transmission system is an open spur gear train...
  5. KM

    Old GE induction motor---just how old exactly?

    Would anyone be able to tell me anything about this old motor? Google is not much help, as "GE induction motor Mode 96145" draws a blank. I'm really curious as to its date--I'm suspecting 1960s, but it may be older than that. It's still in use, very intermittent service, but has not given...
  6. KM

    VFD outdoors, low temps --- bad idea?

    We need to add braking on a motor, and Contractor has proposed VFDs. The make and model he proposes is Télémécanique Altivar 31C with an IP55 enclosure. I'm nervous because I've heard VFDs are very fussy about the ambient temperature they like. The application is hoist motors, outside, on a...
  7. KM

    US to Canadian steel types - are we getting what we specified?

    We wanted weldable notch-tough structural steel to CAN/CSA G40-21 grade 350WT. Supplier proposes American A992 steel with average of 3 Charpy test results being 37 foot-pounds at -20 degrees F. Can't find in "CISC Handbook of Steel Construction" exactly what are the Charpy requirements for...
  8. KM

    PFMA & FMEA - what are these anyway?

    The general topic of my question is flow control equipment at dams. I'm trying to get a hang of what various dam safety documents call "risk informed decision making." I see acronyms like PFMA (Potential Failure Mode Analysis) and FMEA (Failure Mode Effect Analysis) tossed around. I get the...
  9. KM

    CDA Guidelines: Dam class'n based on upstream flooding potential---can you do this?

    Consider a dam on a relatively small river that discharges water over cliff and into a much larger river. In the Canadian Dam Association Guidelines 2007, Table 2-1 for dam classification talks only about downstream consequences of failure. Yet for this dam, the downstream consequence of dam...
  10. KM

    CDA Guidelines: Dam classification based on upstream flooding potential---can you do this?

    Consider a dam on a relatively small river that discharges water over cliff and into a much larger river. In the Canadian Dam Association Guidelines 2007, Table 2-1 for dam classification talks only about downstream consequences of failure. Yet for this dam, the downstream consequence of dam...
  11. KM

    Need to specify testing standards for chloride, carbonation, etc.

    I am writing a Terms of Reference for a Consultant to undertake testing of some existing concrete on a dam deck with the intent to identify the amount of deck area requiring rehabilitation and get a cost estimate for planning purposes. I am asking that the Consultant take some cores and do...
  12. KM

    Benchmarking O&M costs for harbour infrastructure

    I'm looking for published "benchmarking" information on maintenance costs for various types of port and harbour infrastructure (e.g. rubble mound breakwaters, dolosse breakwaters, timber pile wharfs, timber crib structures, etc.), perhaps as an annual percentage of capital costs. I can find a...
  13. KM

    Benchmarking O&M costs for harbour infrastructure

    I'm looking for published "benchmarking" information on maintenance costs for various types of port and harbour infrastructure (e.g. rubble mound breakwaters, dolosse breakwaters, timber pile wharfs, timber crib structures, etc.), perhaps as an annual percentage of capital costs. I can find a...
  14. KM

    Project document file structure

    Our internal audit folks just told us our project files were a mess. I'm in the government in a department that does a lot of heavy civil construction. Some of the design is in-house, some by another government department, and most by consultants. Construction supervision is either in-house...
  15. KM

    Motor options for hoisting application

    Greetings! I am an end-user writing a Request for Proposal for the design and fabrication of a lifting device for my employer. I'm not designing it, just trying to describe what I want the hoisting machine to do so that a fabricator can design and build what we need. I require some...
  16. KM

    How much detail do you need to spec a motor/drive in an RFP?

    I'm writing an RFP for a replacement stoplog lifting machine on a dam. I don't have to spec everything out in detail, but I am describing the machine operation required. I want to spec out a few key points to make sure we have some quality control over the final product. The existing motor...
  17. KM

    Making spare gears from existing: how to spec

    We have some old equipment from the 1940s, slow speed, intermittent service, outdoors.<br> <br> We are undertaking to make drawings of all parts so that we can have spares fabricated. For the gears, our drawings show the overall (outside) diameter of the gear, the rim, spoke, and hub...
  18. KM

    Making spare gears from existing: what info is needed?

    We have some old equipment (1940s), low speed, intermittent service, outdoors. <br> <br> We are undertaking to make drawings of all parts, including gears, so that we can have spare parts manufactured. For the gears, we have already recorded overall (outside) diameter; rim, hub, and spoke...

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