Bentley Communities
Bentley Communities
  • Site
  • User
  • Site
  • Search
  • User
AutoPIPE
  • Product Communities
AutoPIPE
AutoPIPE Wiki 06. Confirm calculation of Flange dia with specified tolerance and corrosion settings using AutoPIPE Vessel
    • Sign In
    • -Pipe and Vessel Stress Analysis - Wiki
      • +.Bentley AutoPIPE
      • -.Bentley AutoPIPE Vessel (powered by Microprotol)
        • +Features and Bugs
        • +General Information
        • -Support Solutions and FAQ's
          • +Air Coolers
          • Boilers
          • -Calculations
            • +A. As Per BS EN 13445-3
            • -B. As Per ASME Section VIII
              • 01. Does the calculation of a body flange according to ASME VIII, div 1, consider a rigidity criterion in an AutoPIPE Vessel model?
              • 02. What is the theory being C-factors derivation as per UG-34 in AutoPIPE Vessel?
              • 03. How AutoPIPE Vessel Calculate Corrosion Allowances as UG- 45 or ASME VIII div.1?
              • 04. How do you enter f1 and f2 for cone calculations in ASME VIII mandatory appendix 1-5?
              • 05. How to calculate the allowable stress for hydrotest case?
              • 06. Confirm calculation of Flange dia with specified tolerance and corrosion settings using AutoPIPE Vessel
            • +C. As Per CODAP
            • D. PD 5500
            • +E. AD 2000-Merkblatter
            • +F. General
          • +Coils
          • +Cost Estimation
          • +Drawings
          • +Expansion Joints
          • +Import / Export
          • +Interface
          • +Lifting Lugs
          • +Loads and Load Combinations
          • +Material, Material Database, and Default Libraries
          • +Nozzles and Flanges
          • +Pressure Vessels
          • +Report
          • +Shell and Tube Heat Exchangers
          • +Shells
          • +Soil
          • +Tanks
          • +Units
          • +Vortex Shedding
          • +Weld Joints
        • +System Messages
        • +Video Gallery
      • +ADL PIPE
      • +Bentley AutoPIPE Nozzle
      • +Bentley PlantFLOW
      • +Bentley PULS
    • +AutoPIPE Brand Learning Resources
    • +Attend a live meeting with an AutoPIPE Analyst

     
     Questions about this article, topic, or product? Click here. 

    06. Confirm calculation of Flange dia with specified tolerance and corrosion settings using AutoPIPE Vessel

    Example:

    In the flanges of this equipment, a 1 mm tolerance and 1 mm corrosion margin have been indicated, but in the calculations, the thickness "corroded dimensions" only subtracts 1 mm, for example, flange 20.04, nominal thickness 40 mm, calculation thickness 39 mm (should be 40 - 1 - 1 = 38mm).

    On the other hand, the body is made of tube and the 7/8 (12.5%) tolerance is applied in the calculation of the cylinder but not in the nozzles, for example, in the calculation of N4, diameter of the opening is 60.3 mm, thickness 5.54 mm and 1 mm corrosion margin so in the dimensions of the table the UG-40, the diameter "d" should be 60.3 - 2*(5.54*7/8-1) = 52,605 mm but in the calculation it appears 60.3 - 2(5.54 - 1) = 51.22 mm.
    Also, shouldn’t the software take into consideration the corrosion allowance? Since the flange will have corrosion before the gasket, its like when the detail has a male-female face and the software subtracts the thickness of the face from the thickness on the bolt. 

    Answer: 

    1. For a flange there is no corrosion at the level of the bolt circle since it is above the gasket, only the tolerance is applied in this part.
    2. As per ASME UG-37(a) the tolerance is not applicable 
                    
    3. Furthermore, 
      See below the thickness of the flange (e) to consider for the stresses checking as per Pressure Vessel codes.
      The local reduction in thickness under the gasket is ignored, the thicknesses are always those measured under the gasket and at the level of the bolting.
    • tolerance
    • AutoPIPE Vessel
    • Calculation
    • Flange
    • Corrosion
    • Share
    • History
    • More
    • Cancel
    • Mike Dattilio Created by Bentley Colleague Mike Dattilio
    • When: Thu, Jan 12 2023 6:15 PM
    • Tanaji Gaikwad Last revision by Bentley Colleague Tanaji Gaikwad
    • When: Thu, Aug 3 2023 1:34 AM
    • Revisions: 4
    • Comments: 0
    Recommended
    Related
    Communities
    • Home
    • Getting Started
    • Community Central
    • Products
    • Support
    • Secure File Upload
    • Feedback
    Support and Services
    • Home
    • Product Support
    • Downloads
    • Subscription Services Portal
    Training and Learning
    • Home
    • About Bentley Institute
    • My Learning History
    • Reference Books
    Social Media
    •    LinkedIn
    •    Facebook
    •    Twitter
    •    YouTube
    •    RSS Feed
    •    Email

    © 2023 Bentley Systems, Incorporated  |  Contact Us  |  Privacy |  Terms of Use  |  Cookies