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  1. ProcEng2

    Thread Efficiency

    I have the following stem thread: .563-7 Stub ACME L.H. Thread The "nut" material is B21-464-H02 Stem material is A-564-630-1075 How do I estimate the stem thread efficiency assuming the threads are not lubricated? I need an efficiency below 35% to ensure backdriving does not occur...
  2. ProcEng2

    Can 6000 lb fittings be safely used in 7500 psig nitrogen?

    We have an application where we have a nitrogen design prssure of 7000 psig. However, commercially available fitting pressure classes seem to be either 3000 or 6000. What is the real rating of a ANSI Class 6000 fitting?
  3. ProcEng2

    17-4 PH material for actuator valve keys

    Edstainless said: "The strength vs ductility properties for each class of alloys is slightly different. You need to look at the properties of each alloy. " PE: Thanks. The Alloy is heat treated condition 1150 F of SA-564 Gr. 630. There does seem to be a difference in strength between aged and...
  4. ProcEng2

    17-4 PH material for actuator valve keys

    Thanks for this: "The only problem we have with 17/4 is in one part of our process we continually thermal cycle all the components and we have had some 17/4 parts that failed in a brittle manner. All of the failed parts had hardness ranges in the upper 40's where the original was in the mid...
  5. ProcEng2

    17-4 PH material for actuator valve keys

    One of our vendors is selecting 17-4 ph cond. 1150 material for a valve actuator key. This material strength of 140 ksi min, seems to border on being too strong in that brittle fracture may be a consideration or fatigue. My experience is that the high strength materials sacrifice toughness...
  6. ProcEng2

    Use of 17-4 ph for valve keys

    17-4 ph (SA-564 Gr. 630 H1150)is being proposed for a 42 in. butterfly valve actuator key (ambient temperature non corrosive)and this material has 30 ftlb impact toughness. The butterfly valve is operated by a Limitorque SMB/ HBC actuator and it is estimated that the required operating torque...
  7. ProcEng2

    Best Rivet to Use for 14 ga Sheet Metal

    We are using 1/8 in. pop rivets to join two 14 ga galvanized sheets as a sleeve extension on a fire seal. The grip range selected by the installer was 0.188 0.250 in. for the rivet. I am thinking a better choice would have been one that pops closer to the thickness of two 14 ga sheets...
  8. ProcEng2

    What is vapor pressure of #1 Diesel fuel

    Anyone know the vapor pressure of #1 diesel fuel at ambient temperature. I am thinking it is near a perfect vacuum... If so, then it would "add" atmospheric pressure for NPSH available?
  9. ProcEng2

    What should allowable shear stress be?

    Cory: provided the necessary explanation for what you listed as values of shear stress used in design. As far as which of the three shear stress criteria you should use, that is a completely different matter. Can you please provide more information related to your OP? Reply: Cory, our...
  10. ProcEng2

    What should allowable shear stress be?

    Thanks, Cory. In our application the key is in pure shear. How would multi axial loading apply in this condition?
  11. ProcEng2

    What should allowable shear stress be?

    I have seen 0.5Sy, 0.577Sy, and 0.4Sy used in various calculations for valve keys in shear. What should be used as a shear allowable stress and why?
  12. ProcEng2

    Is there a reason you would not want to go stronger for A-672?

    Is there a reason you would not want to always use A-672 Gr. C70 over C65?
  13. ProcEng2

    ASTM A672 GR C70 Class 12

    The actual name of the Company is Consolidated Power Supply 3556 Mary Taylor Road Birmingham, Al 35235 Main Line 205-655-5515
  14. ProcEng2

    ASTM A672 GR C70 Class 12

    I don't know about Class 12, but Consolidated Supply in Alabama can supply A-672 C70 Class 22/32 42 in. dia. material in about ten weeks...
  15. ProcEng2

    More Questions on bolt torque

    This is a OEM vertical pump application with a right angle gear drive mounted on a pedestal, the pedestal, bolted to a sole plate, the sole plate grouted to the foundation (and bolted). All of it, including the pedestal mounting bolts, are OEM supply/design. The issue is that the pedestal has...
  16. ProcEng2

    More Questions on bolt torque

    Is there an ASME Code Interpretation that states how high the preload can be as a percentage of yield strength due to bolt torque? I ask this question after reading thread 292-95664 because in the application we are considering, the bearing stress under the head could exceed 80% of Sy at the...

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