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  1. Johnson_123

    Designing Knurled Interference Fit

    I have a knurled interference fit between a shaft and a gear. With an interference of 0.007 in, I am achieving an experimental slip away torque of 7 ft-lb and bending the shaft in the process. What could I possibly do to achieve a higher torque without bending the shaft during the assembly? Both...
  2. Johnson_123

    Pipeline Pulsation Reduction

    Could someone please recommend modifications/reinforcements that could be made to a pipeline to reduce its vibration? Installing a pulsation dampener is not an option that the customer is willing to pursue. Currently, the vane pump sits on a solid base as recommended by the manufacturer and flex...
  3. Johnson_123

    Determination of ID and OD at Cryogenic Temperatures

    I have a 316 SS tube with an I.D. of 0.43″ and O.D. of 0.5 ″. Could someone please advise me on how I would calculate the I.D. and O.D. of the tube at cryogenic temperatures? The linear thermal expansion percent (L – L293/L293) at a temperature range (0 K – 300 K) is the only material property...
  4. Johnson_123

    Stiffness Calculation

    I have a simple omega-shaped SS tube, vibrating at it's natural frequency and constrained at both the ends. Could someone please tell me how I would calculate it's stiffness as a function of temperature. The temperature range I am looking at is 5K to 300K. Thanks in advance!
  5. Johnson_123

    Youngs Modulus - 316L SS

    Could someone please suggest a reliable resource containing information on Youngs Modulus for 316 Stainless Steel at Cryogenic temperatures? Thanks in advance!
  6. Johnson_123

    Polymer selection

    Could someone please recommend a polymer to be over-molded onto a metal surface to create a soft seat valve? This valve will be used in LPG applications. We are currently using Buna-N and it appears that the liquid has gotten between the metal and the rubber and caused the rubber to balloon...
  7. Johnson_123

    260 Cartridge Brass - Hard vs Half Hard

    My supplier is out of 260 Cartridge Brass - Hard Temper which is being used to manufacture flat washers. Can somebody advise me, if the half hard temper which is readily available be used as a replacement? Thanks in advance!
  8. Johnson_123

    Galvanic Corrosion - Leaded Brass and Aluminium

    I have metal to metal contact between leaded brass and aluminum components. The aluminium is Nituff coated and sits inside the brass body. The only fluid that this combination comes into contact with is refined fuels. A dirty green colored deposit is being observed from time to time on the inner...

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