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  1. canmecheng

    Shear load transfer from a bolted flange connection

    Thanks desertfox I see the AISC calculation for slip critical connections and the different classes for surface preparation when determining which slip coefficient to use. But of course this is for structural connections. Is there a common friction coefficient to use for mechanical...
  2. canmecheng

    Shear load transfer from a bolted flange connection

    Hello, How is shear load transferred from a bearing housing to a structure when using a bolted flange connection that has a tight fit? Is the shear load transferred assuming a non-slip connection generated by the bolt clamping force, or does the shear load transfer from mating surfaces which...
  3. canmecheng

    Bearings to Support Moment from Heavy Eccentric Load

    Hi, Depending on your geometry and loading, you may wish to consider a slew bearing. They can take radial, axial and tilting moment loads. If you need the axis to be driven, you can have an external or internal gear.
  4. canmecheng

    Relief valve for accumulator in a closed system?

    Hello, what options are their for adding a relief valve for an accumulator? Is it a common requirement and practice to add a relief valve and empty reservoir to accumulator used for energy storage? Should the relief valve be provided for both the nitrogen and hydraulic side? I have a...
  5. canmecheng

    Worm gear brake selection

    Hi tbuelna, Yes, the worm gear and the gearbox on the motor is back-drivable. We have efficiencies of 65-70% on the worm gear. It has a ratio of 37.5:1 with 2 starts. I am expecting that the thrust bearing will be included in the maximum output torque rating for the slew gear itself, but I...
  6. canmecheng

    Worm gear brake selection

    Hello, How common is it to damage a worm gear with back driven torque load due to braking from a motor? I have a slew drive with a 75:2 ratio and a planetary gearbox with an electric motor. The motor has a brake on the back. I need the brake for emergency stops, but when I use the maximum...
  7. canmecheng

    Heat treated 4340 and 4140 and strength values

    Hi, Thank you for the feedback. I agree with you TVP. The most simple solution would be to specify on the drawing that the sample for testing physicals (per A370) needs to be at a distance from the center which is midway to the center from the smallest diameter section after final...
  8. canmecheng

    Heat treated 4340 and 4140 and strength values

    Hello, I have read quite a few posts regarding 4340 and 4140 so I apologize if this question has been asked before. Do the strength properties in a large shafts (4" & 13" in diameters) vary through the thickness after Quench and temper heat treatment of 4140 and 4340. Would I see differences...
  9. canmecheng

    Calculating combustion air for kerosene based fuel burner

    After reviewing the Perry handbook I see that the air requirement for kerosene is less that natural gas. I also see that NFPA 54 has a calculation for mechanical combustion air required of 0.35 cfm/1000 BTU. It comes out slightly higher. Since I am using a hood above the appliance I think I...
  10. canmecheng

    Calculating combustion air for kerosene based fuel burner

    Thanks chicopee!
  11. canmecheng

    Calculating combustion air for kerosene based fuel burner

    Hello, I have a cooking appliance that burns JP-8 fuel in a confined space. It has a forced ventilation hood and makeup air sized with IMC. Can I use the makeup air for the hood to provide combustion air, or do I need to provide a passive opening sized with NFPA 54? Best
  12. canmecheng

    Selection and sizing check valve for saltwater service

    BigInch, I have not mentioned any limitiations for adjusting the power delievered to my pump. My flow requirement is independent of the losses for the system. My question was regarding the stability for a disc type check valve against chatter given this flow condition. To determine this, I...
  13. canmecheng

    Selection and sizing check valve for saltwater service

    Hi, yes it is a positive displacment pump. It is a subsea application and we are using a stainess gear pump powered by a hydraulic motor. I think I have resigned myself to using a small ball check valve instead of a silent check valve. I just need to check the materials. I think...
  14. canmecheng

    Selection and sizing check valve for saltwater service

    Hi, I have a saltwater fluid circuit that needs to maintain pressure in the event we loose power to our pump. We have used disc check valves for other saltwater circuits in the past but this time the flow is only 3GPM. I am concerned about valve chatter because the pressure drop from the valve...

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