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Flange Leakage Evaluation based on NC 3658.3 Method method using Ca... http://processpiping.blogspot.com/2013/08/NC-3658.3.html#.Ul0w7VNAaQA
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8/30/2013
Flange Leakage Evaluation based on NC 3658.3 Method method using Caesar II Anup Kumar Dey Caesar II, Flange, flange leakage checking, Flange Leakage checking in Caesar II, NC 3658.3, piping stress, piping stress analysis No comments
This is the last post on the topic Flange Leakage Evaluation using Caesar II. I had already published 3 more posts on this topic. Click here to visit those. In this section I will describe the methods of flange leakage evaluation by NC 3658.3 method using Caesar II. Applicability: NC 3658.3 Method for flange leakage evaluation can only be applied if the following two conditions
Top 12 must have Piping books/literatures for a begineer into Piping industry Stess Analysis of PSV connected Piping systems using Caesar II
are met: 1. Flanges, bolts and Gaskets used are designed based on as specified in ASME B 16.5a and 2. Boting material must have a allowable stress value at 100°F(38°C) >=20000 psi (138 MPa) (High Strength Bolting)
Step by Step Methods for WRC 107 and WRC 297 Checking in Caesar II
Governing Equation: By NC 3658.3 method the generated external moment (Mfs) is limited to a value as provided by the below mentioned equation: Mfs<=3125(Sy/36000)C X Ab
Piping Stress Job Interview questions for you: Part 1
(in U.S. Unit)
Here Sy=Yield strength of flange material at temperature
Most useful Engineering Tools/Spreadsheets for you: Part-1 Major Stress related differences in Between 2012 edition and 2010 edition of ASME B 31.3 Bend SIF
and Ab= Bolt area The ratio of Sy/36000 has to be taken less than unity. So it is obvious from the above equation that we have to enter the bolt area and yield strength as input into Caesar II Spreadsheet.
Evaluation steps followed in caesar II:
11 most important questions with answers from ASME B 31.3 which a Piping stress engineer must know Piping Stress Job Interview Questions: Part 6 STORAGE TANK PIPING STRESS ANALYSIS AS PER API 650 USING CAESAR II.
Select Flange Node(From/To/Both) and Calculation Type(NC-3658.3) as shown in Fig. 1. Input Bolt circle diameter from ASME B 16.5. Input Yield Strengths at temperature from ASME BPVC code Section II Part D Table Y1. Calculate the Bolt Area (Ab) as shown below and input in required place: Bolt area, Ab is the total cross-sectional area of the bolts at the root of thread or section of least diameter under stress. Calculate the bolt area as mentioned below :
piping stress
Caesar II interview
Piping Layout static analysis code Flange Piping material supports
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Flange Leakage Evaluation based on NC 3658.3 Method method using Ca... http://processpiping.blogspot.com/2013/08/NC-3658.3.html#.Ul0w7VNAaQA
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Droot = D1bsc – 2*0.21650635P & D1bsc = Dbsc – 2*h Where Droot = Root diameter of bolt Dbsc = Basic major (nominal) dia of bolt (as per ASME B1.1, para 8.3) D1bsc = Basic Minor diameter (as per ASME B1.1, para 8.3)
!
h = Height of thread (as per ASME B1.1, Table 5) P = Pitch of Bolt (as per ASME B1.1, Table 1)
2013 (53) October (6)
Root Area of bolt (Ab) = n x (pi/4* Droot* Droot)
Where n = No. of bolts
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Fig.1: Input Spreadsheet from Caesar II for flange leakage check by NC 3658.3 method
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Now go to the Load Case Option Editor (Fig.2) and select flange analysis
Piping Stress Job Interview questions: Part 4
temperature based on operating/design conditions and click the Run button for analysis.
July (7) June (6) May (5) April (4)
Select the Load Case(s) for which Flange Leakage Check has to be
March (3)
performed and see the results. If the ratio of Flange Stresses to Allowable
February (1)
Stress is less than 100 % (See Fig. 2), Then the flange is within allowable limit and should not produce leakage. If it is more than 100%, Then try to reduce moments at the flange by re-analysis of the system and recheck using the above method.
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Flange Leakage Evaluation based on NC 3658.3 Method method using Ca... http://processpiping.blogspot.com/2013/08/NC-3658.3.html#.Ul0w7VNAaQA
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Fig.2: A typical Caesar II flange leakage analysis report
