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  • Users: frostrobn
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  1. frostrobn

    New stress factors for boiler tube min. wall calculations

    Does anyone know anything about a 1998 revision to ASME BPVC Section I which changed the stress factors used when calculating boiler tube minimum wall? What does it take to get approval to use these factors on a pre-1998 boiler? Jurisdictional approval?
  2. frostrobn

    API 610 clearances

    I have a 3600 rpm, double suction, pump with impeller wear rings that are approximately 7.375" diameter. Can anyone tell me what the proper clearance should be in this application? Fluid temp. is 250F. Thank you.
  3. frostrobn

    Do motors get "tired"?

    We have a 30 hp, 1800 rpm, 480V, 3ph motor that drives an inclined screw conveyor that has been causing issues. At full capacity the motor trips out on overload at times, but has not done so at this capacity in the past. It has always run fairly high load at this rate (90+ % fla), but has not...
  4. frostrobn

    analysis of submerged flat plate

    I'm looking for a little help in determining the proper bending equation to use in the analysis of 1/2" plate welded out around it's perimeter to a structural frame. The frame is submerged and is used to isolate a gate on a hydroelectric dam for maintenance. I was able to analyze the structural...
  5. frostrobn

    erosion of stainless steel piping with steam and oxygen

    There is a process in my facility that uses live steam (160 psig saturated) mixed with oxygen which is piped to the process in 316L stainless steel piping. The piping just after the point of oxygen injection in the steam line is eroding rapidly. The line has to be patched every 3 months or...
  6. frostrobn

    Rapid (erosion?) of stainless pipe in steam/oxygen service

    There is a process in my facility that uses live steam (160 psig and desuperheated) mixed with oxygen which is piped to the process in 316L stainless steel piping. The piping just after the point of oxygen injection in the steam line is eroding rapidly. The line has to be patched every 3...
  7. frostrobn

    Codes and specs for platform on power plant stack

    I am designing a maintenance platform to be installed around a power plant stack approximately 70 feet off the ground. As with other platforms that have been installed at differnent elevations on the same stack, I am intending on welding connection plates to the stack to support the platform...
  8. frostrobn

    Information on column design unity equation

    I would like to know the significance of AISC ASD equation H1-3 (unity equation for compression members) and the preceding equations H1-1 and H1-2. When are these equations used and what is the significance of one over the other? I have not been able to get a real good understanding of these...
  9. frostrobn

    Information on Maurice Walmer, P.E.

    I am looking for any biographical information anyone has about Maurice Walmer, P.E. I use his "Manual of Structural Design and Engineering Solutions" almost daily and see it referenced by many authors. I would just like to know more about him. Thanks.
  10. frostrobn

    Information on Maurice Walmer, P.E.

    I am interested any biographical information that anyone has on Maurice Walmer, P.E. I use his "Manual of Structural Design and Engineering Solutions" almost daily and see it referenced by many authors. I would just like to know more about him. Thanks.
  11. frostrobn

    Swivel for low headroom hoisting of motor

    I have a large motor that is to be removed using two monorails (one on each side of the motor). The monorails are of sufficient rating for the load. The problem I have is that the motor must also be rotated 90 degrees to clear piping and structural obstructions before it can be lowered to the...
  12. frostrobn

    Swivel for low headroom hoisting of motor

    I have a large motor that is to be removed using two monorails (one on each side of the motor). The monorails are of sufficient rating for the load. The problem I have is that the motor must also be rotated 90 degrees to clear piping and structural obstructions before it can be lowered to the...
  13. frostrobn

    Applicable Specs. for lifting lug design

    Can anyone please tell me the applicable specification(s) for the design, fabrication, installation, and use of welded lifting lugs? Thank you.
  14. frostrobn

    Applicable Specs. for lifting lug design

    I am looking for the appropriate specs. to use in the design of welded lifting lugs for lifting steel members and/or structures. (ANSI, AISC publications, etc.) Thanks.
  15. frostrobn

    Evaluation of ENERCALC5.5

    I would like anyone's opinion on the use of ENERCALC5.5. I use it as a "second check" tool for my own hand calculations and find it quite useful. But I also know there is much more powerful software I could be using. What software is available? Could you also describe their intended...
  16. frostrobn

    Bending and torsion on curved monorail

    I am designing a curved monorail and would like anyone's input on the best method to use to calculate bending and shear stress in the beam when the load is applied on a curve between supports. Thanks.

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