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  1. tovi

    Section VIII Division 2 Blind

    The store bought blind flange has not been altered. Does anyone know the reason why the Division 2 code requires UT examination for unaltered blind flanges?
  2. tovi

    Section VIII Division 2 Blind

    According to ASME Section VIII Division 2 Section 3.3.4.1: "All forgings 50 mm (2 in.) and over in nominal thickness shall be examined ultrasonically in accordance with SA-388." Therefore, a 20" 600-lb SA-105 blind flange would need to be purchased with UT examination. Can someone explain to...
  3. tovi

    Nitrogen Flow Rate

    Our Company will be performing a pneumatic test on two pressure vessels. The vessels will be filled with nitrogen using bottles at 2400 psi and 70 F. The bottles will be connected to the pressure vessels by a 1/2" NPT connection. Can someone tell me how to calculate the flow rate of the...
  4. tovi

    Saddle Stiffener Rings

    I am designing a horizontal vessel for full vacuum. The vessel has 2 saddle stiffener rings that also need to act as vacuum rings. Can someone suggest a formula for finding the load acting on the saddle stiffener rings due to vacuum? Thanks for the help.
  5. tovi

    Super-critical sour CO2 service

    Can someone tell me what special requirements need to be considered for a sulfa treat vessel that is in "super-critical sour CO2" service? The vessel will operate at 1500 psig and 120 F and be fabricated from SA-516 70 normalized material, post weld heat treated and coated internally with...
  6. tovi

    Lifting Lugs/WRC 107

    I am designing lifting lugs using the Advanced Pressure Vessel program for a 120" OD horizontal pressure vessel weighing approximately 90,000lb. The lugs will be attached to the heads. In order to be able to check the stresses per WRC 107, the program asks for a rigid square or rigid cylinder...
  7. tovi

    External Pressure on Piping

    I have a couple of questions about external pressure. The pressure vessel has a pipe that enters through a blind flange travels about halfway down the tank and then returns to exit through the same blind. Per UG-28, would L be the length of the pipe from the point it enters the blind to the...
  8. tovi

    Obround Opening Reinforcement

    The last part of UG-36(a)(1) reads "When the long dimension of an elliptical or obround opening exceeds twice the short dimensions, the reinforcement across the short dimensions shall be increased as necessary to provide against excessive distortion due to twisting moment." Can someone tell me...
  9. tovi

    Obround Openings

    I recently got back into engineering after four years of teaching math. Less than three days on the job I was given a horizontal pressure vessel that has two obround openings for firetubes in one of the heads. Can someone give me some suggestions on how to tackle this problem? Thanks!

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