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Flange Leakage Evaluation based on NC 3658.3 Methodmethod 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 published3 more posts on this topic. Click here to visit those. In this section I will describe the methods offlange 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 conditionsare met:
Flanges, bolts and Gaskets used are designed based on as specified in ASME B 16.5a and1.Boting material must have a allowable stress value at 100F(38C) >=20000 psi (138 MPa)(High Strength Bolting)
2.
Governing Equation: By NC 3658.3 method the generated external moment (Mfs) is limited to a value as provided by thebelow mentioned equation:
Mfs
Droot = D1bsc 2*0.21650635P &D1bsc = Dbsc 2*hWhereDroot = Root diameter of boltDbsc = 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)
Root Area of bolt (Ab) = n x (pi/4* Droot* Droot) Where n = No. of bolts
Fig.1: Input Spreadsheet from Caesar II for flange leakage check by NC 3658.3 method
Now go to the Load Case Option Editor (Fig.2) and select flange analysistemperature based on operating/design conditions and click the Run button for
analysis.
Select the Load Case(s) for which Flange Leakage Check has to beperformed and see the results. If the ratio of Flange Stresses to Allowable
Stress is less than 100 % (See Fig. 2), Then the flange is within allowable limitand 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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Fig.2: A typical Caesar II flange leakage analysis report
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