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  • Users: NBR90
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  1. NBR90

    Reading an optical flat correctly

    So I have three optical flats of 1/20, 1/10 wave and 1/4 wave accuracy. The surface test piece (A) that is being measure is flatter than 1/4 wave. Let's assume it has accuracy of ~1/8 wave. So from my understanding, the 1/4 wave optics should show all flat parallel lines when places above...
  2. NBR90

    How to expand a metal seat ring (SS316) with a teflon insert to fit in a bore that is too big?

    The OD of the metal seat ring is about 75 mm (3") and about 25 mm thick. It is suppose to be fit into a bore with ID of approximately 75.5 mm (standard carbon steel). So obviously this is not a correct size as the bore needs to be smaller than the OD of the metal seat by about .30 mm. So the...
  3. NBR90

    Hydraulic press design need help.

    Hello, I'm designing a typical hydraulic press. I'm using 2 posts [2 solid cylinders] instead of usual 4 posts for support. It is used for hydro-testing valves. [jpeg pic included] The two cylinder posts [Grey color in the jpeg pic] ~ 130 mm diameter. The thickness of two plates [purple...
  4. NBR90

    Safety Valve - Full life, Cv & pipe sizing for testing SV

    Hello, Is there a formula for determining the maximum Cv or flowrate for say a 1.5" inner pipe diameter (Air pressure range: 100 - 2000 psi)? The pipe is about 1 meter horizontal and 1 meter vertical from a 70 liter pressure vessel. I'm trying to find out what will be the minimum Cv, given...
  5. NBR90

    O-RING Groove design for hydrostatic testing

    I'm having trouble with coming up with the right groove design. Briefly, I do hydrostatic testing on valves from 2" to 36". For 2" - 12" I need to test them for leakage up to 5000 psi water pressure. I have a 200 ton hydraulic clamping system with 200 mm cylindrical rod in the middle...

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