SUPERLIT GRP pipe standards, norms and quality tests
SUPERLIT products meet the stringent international quality standards, are subjected to regular performance tests and graded to the highest industry standards. Experience the quality approach that guarantees the durability and reliability of every metre of GRP pipe.
Highest standards in GRP pipe manufacturing and testing
SUPERLIT GRP pipes are designed and manufactured on the basis of the most stringent international standards. Every stage of production - from the selection of raw materials, through the moulding process, to final testing - is subject to the precise quality control. Implemented procedures ensure compliance with global technical standards, resistance to chemical and mechanical agents and durability proven long-term tests.
This makes SUPERLIT GRP pipes a reliable solution for both water and sewage infrastructure, as well as in more demanding industrial or energy applications.
Quality standards and tests SUPERLIT GRP pipes
Find out what classifications, performance standards and test procedures our GRP pipes meet. Select your area of interest to find out more about the standards that prove the superior quality of our products.
Product classification
Pressure classes of GRP pipes - ISO and AWWA standards
Pressure classification (PN) is set in accordance with standards ISO and refers to pressures expressed in bar.
Pressure classes of SUPERLIT GRP pipes
The range of PN classes includes: PN 1, 4, 6, 10, 12, 16, 25 and 32. PN 1 concerns pipes non-pressurised (gravity). In the normal AWWA C950 GRP nominal pressure classes expressed in psi are also specified: 50, 100, 150, 200, 250.
Pipes SUPERLIT GRP are manufactured in the following pressure classes:
| Pressure classes (PN) | Pressure (BAR) | Pressure (Psi) | Pressure (MPa) | Pressure (atm) | Pressure (kPa) |
|---|---|---|---|---|---|
| 1 | 1 | 14,5 | 0,1 | 1 | 100 |
| 6 | 6 | 87 | 0,6 | 6 | 600 |
| 10 | 10 | 145 | 1 | 10 | 1000 |
| 16 | 16 | 232 | 1,6 | 16 | 1600 |
| 25 | 25 | 362,5 | 2,5 | 25 | 2500 |
| 32 | 32 | 464 | 3,2 | 32 | 3200 |
Stiffness classes of SUPERLIT GRP pipes
Pipes SUPERLIT GRP are available in the following stiffness classes. It is also possible to produce pipes with intermediate values or by stiffnesses exceeding SN 10000.
| Stiffness (SN) | N/m² (Pa) | AWWA C950 (Psi) |
|---|---|---|
| 2500 | 2500 | 18 |
| 5000 | 5000 | 36 |
| 10000 | 10000 | 72 |
Performance standards
Standards developed by EN, ISO, AWWA and ASTM cover a wide range of glass fibre reinforced pipe (GRP) applications, including: transporting water, domestic sewage and chemicals. A common feature of these standards is that they all relate to performance of GRP pipes - each standard defines specific performance tests, which pipes and fittings must pass.
All of the following standards include quality control and performance testing procedures:
EN (European Standards) and ISO (International Organisation for Standardisation)
The EN and ISO standards cover GRP pipes in diameters from 50 mm to 4,000 mm used to transport water and wastewater.
SUPERLIT GRP pipes meet the requirements of the following standards:
- EN ISO 23856 - for pressurised and non-pressurised water supply, drainage and sewerage systems
- ISO 25780 - for the transmission of water, sanitary and rainwater sewers using jacking techniques
- ISO 10467 - for pressurised and non-pressurised drainage and sewerage systems
- ISO 10639 - for pressurised and non-pressurised water supply systems
- ISO 10465 - installation procedures
AWWA (American Water Works Association)
AWWA is comprehensive standard for glass fibre reinforced pipes, including detailed specifications quality control i performance tests.
This standard applies to pipes and fittings used in pressure water supply systems.
SUPERLIT GRP pipes are designed to meet all the performance requirements of this standard.
The design of GRP pipes installed underground and above ground is governed by the document AWWA M45.
AWWA C950 - for glass fibre pressure pipes (clean water transport)
AWWA M45 - Design guidelines for GRP pipes
ASTM (American Society for Testing and Materials)
ASTM standards are a set of technical documents used for various applications of GRP pipes - both in pressure and non-pressure installations.
ASTM D3262 - for fibreglass sewage pipes (non-pressure sewage transport)
ASTM D3517 - for glass fibre pressure pipes (clean water transport)
ASTM D3754 - for sewerage and pressure pipes used in industry
Quality control and performance tests
Quality control of SUPERLIT GRP pipes
Circumferential and axial load capacities of manufactured pipes is verified by routine tests. In addition, verification tests are carried out structure and material composition of GRP pipe.
Controls during production include
Control tests on raw materials
Hardness according to Barcol
Wall thickness measurement
Pipe length measurement
Outer diameter measurement
Hydrostatic pressure test
Checks on samples
Pipe stiffness
Stiffness is a measure of a pipe's resistance to circumferential deformation under external loads. The initial circumferential stiffness (S₀) is calculated using the formula below, in accordance with ISO 7685 and EN 1228 (deformation of approx. 3%):
S₀ = F * f / (L * y)
f = (1860 + (2500 * y / dm)) / 100000
Where:
S₀ - stiffness [N/m²].
F - applied force [N]
f - deformation factor
L - length of sample [m]
y - vertical deformation [m].
dm - average diameter [m]
Non-destructive strain test
According to ISO 10466, the pipe samples are subjected to nominal deformation - they must meet the requirements given in the table (below).
Peripheral tensile strength
The tests are carried out in accordance with ISO 8521 and EN 1394. The results must comply with the minimum requirements set out in the international standards.
Axial tensile strength
Tests are carried out in accordance with ISO 8513 and EN 1396. SUPERLIT GRP pipes undergo rigorous testing to meet all requirements.
SUPERLIT GRP quality control tests
Raw materials are tested before production begins, to check their compliance with the applicable standards. Pipes with diameters from 300 mm to 4000 mm are subjected to a hydrostatic pressure test using flexible couplings.
Performance tests for GRP pipes
Joint leakage test
Verification is carried out in accordance with standards EN 1119, ISO 8639 and ASTM D4161.
Long-term tests (minimum 10,000 hours)
- Hydrostatic Design Basis (HDB)
- Stress corrosion test
- Long-term peripheral stiffness (in an aqueous environment)
- Long-term peripheral deformation test
These tests are used to determine design values for the assumed 50-year service life of GRP pipes. The test data are analysed by logarithmic regression (least squares method) according to the ISO 10928.
