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  • Users: condesinc
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  1. condesinc

    ASME Code Case 2547 Flange Rigidity Exemptions

    As near as I can tell, code case 2547 is still active/applicable. TRUE?? I cannot find any posts anywhere less than five years old, but its not shown as killed on the ASME webpage. Can anyone tell me what the actual exemption language is? I understand its a very short code case. The...
  2. condesinc

    UHX-13.2 - Definition of Edge Conditions

    All: For over 20 years, and as recently as several months ago, we have been getting large (16,000-27,000 ft^2) code stamped process heat exchangers for PET plants with one tubeheet integral to shell and channel, and the other tube sheet integral to shell and extended as flange. So far, no...
  3. condesinc

    Induction Motor Efficiency at Reduced RPM

    Hello all: Bit of intro: I am a gyro gearloose (mechancal) as opposed to a wireloose, but I have a lot of past experience in controls/electrical design/analysis etc, so if the reply is not too technical, I can probably follow. A source of great frustration for me for several years has been the...
  4. condesinc

    Obtaining Old Reference - Torque Capacity Hex Features

    thread404-200026 Can anyone tell me how to get a copy of the old: CASE, G.S. "Stresses on bolts-nut dimensions-wrench design, Mechanical Engineering, Sept 1927, pp919-925. I would like to see if there is any additional treatment of the geometry fit factor CH in the torque equation...
  5. condesinc

    Design guide Help-Shaft Reverse Screw Seal

    Can anyone help me with design guidelines/calculation info for a shaft reverse screw "seal"? Application: Threads on a rotating shaft, comprising "seal" or "excluder" in conjuction with the OD wall of stationary through sleeve or bore. These are inboard of a mechanical seal. Thread end and...
  6. condesinc

    Clarification-Help on Reverse Screw Seal

    On re-reading my post, I thought some clarification was in order. (Have also uploaded sketch): Application: Threads on a rotating shaft, comprising "seal" or "excluder" in conjuction with the OD wall of stationary through sleeve or bore. These are inboard of a mechanical seal. Thread end...
  7. condesinc

    Shaft Reverse Screw "Seal"

    Can anyone help me with design guidelines/calculation info for a shaft reverse screw "seal"? Application: Threads on a rotating shaft, comprising "seal" or "excluder" in conjuction with the OD wall of stationary through sleeve or bore. These are inboard of a mechanical seal. Thread end and...
  8. condesinc

    Reverse Screw Seal Design Guide

    Can anyone help me with design guidelines/calculation info for a shaft reverse screw seal? Application: Inboard of mechanical seal, end flush with inside of polycondensation PET reactor, one end about 80-160 centipoise, other end about 2000-3000 poise, near vacuum (2mm Hg) in reactor. Screw...
  9. condesinc

    Flange Design Basis using Weld Ring Gaskets

    I am about to embark on an internal design guide/basis for flange design utilizing weld ring gaskets. So far I have found **zip** about relevant m and y to use. I suppose it could be argued that zero for both is applicable...and I have done this in the past on a few safe things, without...
  10. condesinc

    Seismic Design - Pressure Vessels -Chemical Plants

    Am looking for guidance on treatment of seismic loads for pressure vessels. Our application: Polyester Chemical Plants. Up to now, we have just been using a "g" load of .06/.07 corresponding to Mercalli scale of VI. A new client is in a zone VIII, which gives a horizontal g of...

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