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  1. Slowzuki

    The best way to protect a bolt from loosening?

    I'm assuming most of the respondents have not worked in a sawmill environment. Fancy fixes to this problem will not be appreciated by the customer the next time the line is revised or requires maintenance. I'm assuming the log is falling from a trim saw or sorting machine onto a drag chain or...
  2. Slowzuki

    Steel/Copper corrosion in hydronic heating system.

    There are oxygen scavenging and corrosion inhibiting additives used in hydronic heating systems as well to prevent corrosion. Not always used in closed systems. When inspecting a hydronic system, if lots of makeup water has being used over time say due to a collapsed pressure tank, you are...
  3. Slowzuki

    Use of galvanized ductile iron grooved fitting

    The systems are tested annually at which point fresh oxygen bearing water is introduced. During this time corrosion occurs until the oxygen is consumed. If say a galvanized pipe plug is installed in the system the zinc is rapidly stripped off the pipe plug and pitting starts on the plug...
  4. Slowzuki

    Is a Variable Speed Pressure Limiting Control really needed?

    Is it a tall building? Are you using the FP to meet pressure requirements on the standpipe? Are the systems designed as high pressure? I have no love pressure relief or reducing valves. They seem to need a lot of maintenance to remain working years down the road. I assume you mean you are...
  5. Slowzuki

    Alternative to a flowswitch....

    As a note, in large systems that have been recently drained, the jockey pump can sometimes operate a long time, often longer than the flow switch delay setting. We have found an excess pressure pump on an alarm valve using an alarm switch with mechanical/pneumatic delay to be a fairly good...
  6. Slowzuki

    Use of galvanized ductile iron grooved fitting

    Good afternoon, I've been asked by a client to consider a substitution in my design of a wet pipe sprinkler system. The system will have an oxygen depleted condition when in service and there are no know MIC problems in the surrounding areas. The system was designed using normal plain steel...
  7. Slowzuki

    client poaching from the poachee's perspective

    In my province of Canada, non-competition clauses are very weak. If they are too strong, a judge simply throws out the whole agreement. They are only upheld when reasonable. So if I work in a field that any mechanical engineer could work in, and I part ways, my employer has no claim to a...
  8. Slowzuki

    Unhappy Client

    Very interesting, I had a bit of trouble with the authority using a similar system only it was 4-5 feet of compacted aggregate in trenches below a continuous footing. They required another engineer review the design. He didn't want to assume any liability so my continuous footing became a...
  9. Slowzuki

    Air Comp plugged into wall outlet

    Air-compressors are not required to be listed, you can grab air from the plant air supply or better yet instrument air. The power supply isn't required to be supervised either. The client obviously would like the dry system to be reliable. No one wants busted pipe due to freezeups from...
  10. Slowzuki

    Lag Screw into End Grain of a 2x8???

    The inverted joist hangers is better than my idea but www.socketsystems.com sell pre-drilled purlin clips that are a 1/8th or so thick steel angle with predrilled holes. I'm using them to attach a fascia to cantalevered 2x6's so it can be installed from the roof (difficult to get to the face of...
  11. Slowzuki

    UL/FM Approved Fire Pump w/Mechanical Seal?

    UL Listed / FM Approved
  12. Slowzuki

    Combine, Tractor, Skidsteer Loader fires and failures

    I have worked some construction equipment fire investigations, all are much after the fact, one was 4 years post fire. Luckily some components were preserved and the original cause listed was shown to be false.
  13. Slowzuki

    More detailed info on Frost Heave? Literature?

    I don't know what you are looking for, search those resources he listed, they contain piles of detailed information. You have to design around those 3 key items, you can't load a footing high enough to defeat the frost heave, only the adfreeze in some cases. I think I've seen a number of 100...
  14. Slowzuki

    CO2 portable extinguishers and NFPA10

    In power plants I have spec'd ABC's based on size/travel distance requirements and the reduction allowance for hose stations. We then placed CO2 extinguishers at electrical / computer room entrances and around other specific electrical hazards. If you have a Class A fire in a piece of...
  15. Slowzuki

    Business Digital Camera

    Sony DSC-85, not sold anymore but 4.1 mp, any size card you want, excellent low light ability especially the non-flash mode if you toss a bean bag in your case to steady the camera on. Also has a flash shoe to put a real flash on. None of the little ones on the camera are rated for more than...
  16. Slowzuki

    Fire Water System

    NFPA requires a listed fire pump be installed, I believe FM and UL are the only fire pump listing agencies in north america. 1. 1500 USGPM 2. 2500 USGPM 3. 111 USGPM The first two you would traditional use a horizontal split case, double suction pump, although nowaday they have the upright...
  17. Slowzuki

    Plasma cutting lifting holes in structural steel: code?

    BTW the heat affected zone from a plasma cutter is tiny compared to that of an oxy-act. torch.
  18. Slowzuki

    Timber Post Moment Connection

    I don't exactly follow what you are designing, you are trying to provide a moment resisting connection at the base of a wood column? Our place is using a booted type connection but I'm not planning on any moment resistance, only lateral restraint. A couple from the bolts may work but wouldn't...
  19. Slowzuki

    Footings for small cabin re:frost heave

    Here in New Brunswick, Canada, this is what we use for this application: http://www.foottube.com/ It is a tapered plastic tube and pad combined. It works excellent, many camps and even homes are built on them. Some engineers will spec some light reinforcement be placing inside before filling...
  20. Slowzuki

    more on engineer degrees

    Our office encourages people to bring in their degrees and post them up. I don't even know where mine is, never took it out of the envelope. It isn't that I'm not proud of the work I did to get it, more that I prefer useful or interesting things on my walls. It reads Bachelor of Applied...

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