BE-13 Renovation: Lining with Cured-In-Place Pipes - Processes - v01

Static Proof

Material Identification Groups and Standard Statics

CIPP liner material identification groups

For the various CIPP liner material identification groups are defined (see table). The offered CIPP liner is assigned to a material identification group, whose minimum values are achieved at least, by means of the long-term flexural modulus and the long-term flexural strength determined in the suitability test. Based on the assignment to a material identification group the material characteristics (flexural modulus and flexural strength) are selected in the table and have to be used for the static dimensioning.

Standard statics

On the basis of the material properties of the material properties groups, standard structural analyses were calculated for standard load cases of host pipe condition II, the results of which (the design wall thickness or composite thickness according to worksheet DWA-A 143-3) are summarized in matrices for the host pipe dimension and the groundwater level (see appendix C). This means that the product offered is statically pre-dimensioned for the specified load case. The standard load case of host pipe condition I is thus also covered on the safe side [DWAM144-3:2012].

Table: 

Material identification groups for glass fiber reinforced CIPP liner [DWAM144-3].
Group Long-term values1) Long-term values1)

Flexural strength
in N/mm2
  Flexural modulus,
determined according to
DIN EN 1228
in N/mm2
Glass fibre reinforced CIPP liner
8 3500 75
9 4000 80
10 4500 85
11 5000 90
12 5500 95
13 6000 100
14 6500 105
15 7000 110
16 7500 115
17 8000 120
18 8500 125
19 9000 130
20 9500 135
22 11000 150
24 12000 160
23 14500 185
25 16000 200

 

 

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