ASME PCC-1 : Assembly Bolt Stress & Torque Determination

ASME PCC-1 Appendix O in addition with WRC 538 can be used to detemine requisite torque for flange bolt during assembly. The appendix provides two approaches to select appropriate bolt stress and hence torque. In the simple approach of ASME PCC-1, bolt stress is selected to achieve a desired target gasket stress per equation O-1. Read more about ASME PCC-1 : Assembly Bolt Stress & Torque Determination[…]

ASME PTB-3 Validation – Fatigue Analysis

Equipments when subjected to cyclic loads may fail due to fatigue. As an illustration consider an example of a wire being bent back and forth until the plastic deformations grow so that it ruptures. In ASME fatigue analysis typically the cyclic loads are pressure and/or temperature. Here an ASME PTB-3 Validation for “Example E5.5.3 – Elastic Stress Read more about ASME PTB-3 Validation – Fatigue Analysis[…]

ASME PTB-3 Validation – Protection Against Local Failure

In addition to demonstrating protection against plastic collapse, the analyzed components must also qualify the local failure check per section 5.3 of ASME Sec VIII Div 2. The code gives two analysis methodologies to do this.The first method is to carry out an elastic analysis and check triaxial stress limit given as 4S by eq Read more about ASME PTB-3 Validation – Protection Against Local Failure[…]

ASME PTB-3 Validation – Limit Load Analysis

Limit Load analysis are non linear in nature and may require significantly more computation time and resource than a linear elastic analysis. As such a linear elastic analysis is always a recommended first step. It helps to ensure the FEA problem is correctly setup i.e. there are no rigid body motions, deformations and far field Read more about ASME PTB-3 Validation – Limit Load Analysis[…]

Flanged and Flued Expansion Joint

For ASME UHX heat exchangers, the design and analysis of thick flanged and flued expansion joints need to be carried out using FEA. Though the user can take various different approaches to achieve this, the analysis methodology recommended by TEMA (RCB-8) has become sort of standard in the industry.  TEMA analysis guidelines are very well Read more about Flanged and Flued Expansion Joint[…]