SN Calculation

The app returns the SN value of a pipe according two main methods: a) by the use of formula (1) b) by test method and formulas contained in EN ISO 9969
Nominal ring stiffness (Solid-wall pipes made of PE or PVC-U)
Nominal ring stiffness (Structured-wall pipes tested according to ISO 9969)
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SOLID-WALL PIPES MADE OF PE OR PVC-U   
Raw material  
Young’s modulusE(MPa)
SDRSDR( )
Nominal ring stiffnessSN(KPa)
Creep modulusc( )
Long term young modulusE0(MPa)
Long term stiffnessSN0(KPa)
STRUCTURED-WALL PIPES TESTED ACCORDING TO ISO 9969   
Load @ 3% (ISO 9969)F3%(N)
Sample lengthL(mm)
Pipe internal diameterDi(mm)
Nominal ring stiffnessSN(KPa)