Branch connections are one of the most stressed parts of any piping system. In addition to internal pressure loading, bending moments can be applied in the branch connections of piping or pipeline system. These bending moments may be caused by thermal expansion or contraction, dead or live loads, movement of piping supports, and external forces. ASME (American Society of Mechanical Engineers) B31 Codes for Pressure Piping provide a detailed engineering method for pressure design of branch connections. The method for bending moment design of branch connections, however, is not well defined. According to the code, the bending stresses in the branch connections depend on the section modulus of the pipe and SIF (stress intensification factor), both of which are based on nominal wall thickness of matching pipe. The code does not define 'matching pipe'. The actual adjoining pipe to which the branch is connected cannot be interpreted as the matching pipe in many cases because it is not required that adjoining pipe and branch connection have the same design pressure-temperature rating. Although the proposed method uses ASME B31.3 equations, the method may be used for piping and pipeline systems designed per any B31 Codes for Pressure Piping with some modifications that reflect a specific requirement of certain B31 Code.
Method calculates SIF for branch piping connections
Eine Methode zur Berechnung des Beanspruchungsfaktors an Verbindungen bei Rohrabzweigungen
Oil and Gas Journal ; 101 , 35 ; 80-82
2003
3 Seiten, 1 Tabelle
Aufsatz (Zeitschrift)
Englisch
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