What is ISO 4152 about?
ISO 4152 specifies a method for determining the apparent axial long-term modulus of pipes subject to beam bending deflection between vertically supported end-couplers, which allow rotation of the pipe relative to the couplers.
The modulus is used to calculate deflections and rotations of pipes installed on two or more supports. For practical reasons, the test method is not suited for diameters greater than DN 600.
In conjunction with ISO 10928, ISO 4152 expresses the results of the test as an apparent axial long-term modulus for use in the calculation of mid-span beam deflection and end rotation of GRP pipes.
NOTE: Test conditions and requirements are specified in the referring standard.
Who is ISO 4152 for?
ISO 4152 on the determination of the apparent axial long‐term modulus of pipes subject to beam bending is useful for:
- GRP pipe manufacturers
- Contractors
- Civil engineers
- Product designers
Why should you use ISO 4152?
GRP pipes are flexible pipes albeit with a limited strain potential. Thus, in cases where pipelines are very long, due to steep bends, the axial stress it is subjected to can be a concern.
ISO 4152 takes you through the necessary guidelines, requirements and calculations to assess the axial long‐term modulus of pipes which ensures optimal operational and structural efficiency of the overall piping system. Accuracy in calculating the deflections and rotations will minimise the risk of displacements caused by externally applied loads or forces.
