|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| |
|
|
|
|
|
|
|
|
|
|
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
|
|
|
|
|
|
|
|
|
| |
|
|
|
|
|
|
|
|
|
|
|
Solid-wall pipes made of PE
or PVC-U
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| |
|
|
|
|
|
|
|
|
|
|
|
Raw material
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Young's modulus
|
E
|
(MPa)
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
SDR
|
SDR
|
( )
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Nominal ring stiffness
|
SN
|
(KPa)
|
|
|
|
|
|
|
|
|
|
|
Creep modulus
|
c
|
( )
|
|
2,5
|
|
|
|
|
|
|
|
|
|
Long term young modulus
|
E0
|
(MPa)
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Long term stiffness
|
SN0
|
(KPa)
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Structured-wall
pipes tested according to ISO 9969
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| |
|
|
|
|
|
|
|
|
|
|
|
Load @ 3% (ISO 9969)
|
F3%
|
(N)
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Sample length
|
L
|
(mm)
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Pipe internal diameter
|
Di
|
(mm)
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Nominal ring stiffness
|
SN
|
(KPa)
|
|
|
|
|
|
|
|
|