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  • Users: ccaissie
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  1. ccaissie

    Increasing chain drive efficiency

    I am building a chain drive version of a geared "two man hand powered rice huller" for the Maine Rice Growing Project. I'm copying a Japanese made impact type huller that works well. Initially the idea of using sprockets and chain seemed feasible to increase the speed from a manual input of...
  2. ccaissie

    Reboiler calcs

    Thanks all, for previous help in this methanol distillation design, discussed under methanol volatilities: What would you recommend for simple calculations to design a reboiler. I know there are canned programs out there. This design is simple. All we need is more heat until it works, but...
  3. ccaissie

    Variable Methanol volatilities

    I had read in a post by member 25367 that the relative volatilities of Methanol/water change with purity. In designing a methanol column for a client, a packing vendor had stated some very high stage heights, saying methanol is different. By my own calcs, VLE's etc., I have come up with a...
  4. ccaissie

    Ceramic Hybrid Bearing Failure Analysis

    We have had a failure of a ceramic hybrid angular contact bearing, and are seeking the root cause of this. We are using a lower pair of 6220 deep groove radial bearings which are intact, and an upper pair of 7218 bearings with a preload gap of 11 microns, which was properly torqued and locked...
  5. ccaissie

    Maximum hardness of 1026 steel

    Because of limited shape availability, I need to know if 1026 steel can be hardened to Rockwell C36? TIA, Colin
  6. ccaissie

    What is equivalent to WP-1 motor rating?

    Hi: Received a motor spec requiring WP-1 (weather-protected-1). These are to go on Water Treatment Plant flocculators, and are for outside service. Since WP-1 does not exist for small motors under 100hp, I need to find the closest common specification off-the-shelf for these 3 and 5 hp units...
  7. ccaissie

    Best Alloy for SS mixer blades?

    Hi: Looking for the best combo of hardness and corrosion resistance in stainless steel. We like 17-4PH for hardness and fab reasons, We like AL6XN for corrosion, but it's too soft. We'd also like to avoid elaborate heat treat or welding procedures. Colin Caissie UET Mixers
  8. ccaissie

    Supercritical Methanol Biodiesel

    Currently operating a prototype unit for testing. Transesterification seems to be relatively straightforward at 100bar and 300C. In our attempt to esterify Free Fatty Acids from biodiesel byproduct, we seem to have reached a limit. Starting with FFA that titrates around "20", we can only get...
  9. ccaissie

    Two motor problem on a single VFD

    Hi: We have 12 flocculators running at a Water Treatment plant, and have multiple and repetitive failures of the motor shaft and gearbox shaft. Via tandem gearboxes, we operate the 90" impellers in water. The 3hp 1200rpm 3 phase motors operate in pairs, two per VFD, and run at about 70% speed...
  10. ccaissie

    Weldable, hard stainless for mixer blades

    Hi All: Looking for reasonably weldable, hard stainless for mixer blades. Considered 440C for hardness but weldablility is questionable. 17-4 may be the choice....but trying to get away from post-weld heat treating. Any suggestions? 430? 17-4? CSC UET Mixers, Inc.
  11. ccaissie

    Old Beam Shape ID?

    Can anyone help ID an old beam shape designated CB 211? It is 21" x 58#. Probably stands for "carriage beam". This one is approximately a W21 x 57#. Customer requests duplication. thanks, CSC
  12. ccaissie

    Wear sleeve and bushing in abrasive slurry.

    Hi: Searching for the right bushing material in designing a wear sleeve and bushing for a shaft steady bearing used in a tank of TiO2 slurry. The slurry is used as a paper whitener, so is extremely fine. The wear sleeve is 316SS, the bushing material TBD. The maintenance interval should be...
  13. ccaissie

    Alloy choice to comply with A105?

    We are fabricating an ANSI A105 flange, 6"-900# class RFWN with engineered modifications. I have been told that A105 requires a carbon manganese alloy similar to AISI 1330, but with less manganese. What stock alloy is appropriate? Regards, Colin, UET Mixers Inc.
  14. ccaissie

    Forming a metal helix

    Is anyone familar with a method of twisting or forming a helix from a strip or plate of stainless steel? In this case I am using 304, about .12" thick and 1.4" wide, and need the "pitch" to be about 4.5" per complete turn. We have large lathes, so power and control is not an issue in twisting...

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