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  1. EngineerRed

    High Temperature spring material

    I'm looking for a spring material (preferably alloy steel) that could withstand operations in temperatures as high as 1200 deg F . Can anyone suggest a material please ?
  2. EngineerRed

    ASME BPVC Section I - Open/Closed Bonnet

    I couldn't find the clause that mandates the use of open bonnet in Section I boiler safety valves . Is it inferred somewhere else ? All that I could find is PG-68.6 which is for Superheater/Reheater valves btw
  3. EngineerRed

    PSV Set Pressure BPVC VIII

    A customer asked me to stamp the PSV nameplate at 1000 psig , but set the valve at 1030 psig . The PSV should be stamped UV . Does BPVC VIII allow such practice ? The customer points that the code allows 3% tolerance on set pressure , so he demands setting the valve at upper limit . In our...
  4. EngineerRed

    Wind turbine blade design

    Okay ,first step is BEM theory estimates the dimensional characteristics of the turbine blade , like shape of the air foil , angle of twist etc. and its effect to produce the power output of the turbine .Second , there is however a need to find the structural and fatigue loading from the wind...
  5. EngineerRed

    Wind turbine blade design

    Hi I'm recently involved in providing technology service to a firm that manufactures small wind turbines . There is a requirement to certify their new proposed wind turbine per DNV / IEC standards . I've been requested to provide CAE analysis of turbine rotor blade which is a part of the...
  6. EngineerRed

    A582 - S41600 Cond T / Mechanical Properties

    I'm looking for an authentic source for the mechanical properties of S41600 Cond T , I couldn't find them in ASME B&PVC Section II d , and in ASTM A582 either . Where else can I get this information ?
  7. EngineerRed

    Allowable stress Vs Yield strength for bolting design

    Mike Thanks for that approach . I'm wondering what is the real length of engagement . B 1.1 , states that it is equal to 9 pitches . whereas my tapped hole is of 3 inches . Which one is right ? Vikko , Thanks . I'll use the allowable stress (S) hereafter .
  8. EngineerRed

    Allowable stress Vs Yield strength for bolting design

    I am designing a bolting for Body-Bonnet connection of my valve . It is a BPVC Section I valve . I have two material options i) A193 - B16 ii) SB637 -Inconel 718 . I'm calculating the thread shear (stripping) stress and tensile stress to valuate my bolting . If I compare these with allowable...
  9. EngineerRed

    Limits of 600# flange

    Okay , I should have mentioned clearly , my bad . The Valve that I'm gonna fit is a PRV . My existing piping has 3/4 600# flange on the upstream and 1" 300# on the downstream . I've given a PRV that has 3/4 male nipple SW end without a slip-on flange , Outlet of the PRV is however 1" 300# . The...
  10. EngineerRed

    Limits of 600# flange

    I'm looking towards using the existing pipe flange for my new valve, But my new valve has more outlet pressure than the previous one . According to specification it needs 900# flange whereas my existing piping has only 600# . How can I check if I can use this same existing flange ? Service...
  11. EngineerRed

    Very Large Springs

    Are there any manufacturers who can build extremely large springs in the US ? I'm looking for a spring that has a spring rate around 50000 lb/in and stroke of 3 inches , wire diameter around 3.88 inches .
  12. EngineerRed

    Correction factor for helical compression spring

    I'm designing a helical coil compression spring . The spring has to be preset to the final free length . Which correction factor should I use for after set removed condition ? Is it Wahl's that considers both curvature and direct shear or just the direct shear What is the correct method to...
  13. EngineerRed

    Safety Valve Discharge Pressure

    The Obturator - thanks for the response I'm looking towards estimating the pressure that is displayed on the pressure gauge at the outlet of a Safety valve when its fully open and discharging to a header that relieves to atmosphere . By the way , what is the pressure displayed by the gauge...
  14. EngineerRed

    Safety Valve Discharge Pressure

    Hi Is it possible to estimate the pressure at the outlet of a Safety Valve at discharge using the Upstream data . For Example : A safety valve discharging steam at Set pressure 1000 psig and relieving Temperature 650 F , what will be the back pressure at the outlet ?

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