Classification Of Products
Pressure Classes
Pressure classifications (PN) are established in the ISO standards by considering the pressure unit to be applied as bar.
Classification of nominal pressures:
PN 1, 4, 6, 10, 12, 16, 25, and 32 are nominal pressure classifications. Pressure classification PN 1 is for non-pressure (gravity) pipes.
GRP nominal pressures are classified in AWWA C950 as follows.
Psi: 50, 100, 150, 200, 250
SUPERLIT GRP pipes are manufactured according to the following pressure classifications.
Stiffness Classes:
SUPERLIT GRP pipes are manufactured according to the following stiffness classifications. It is possible to manufacture with intermediate values or stiffness value of greater than SN 10000.
Performance Standarts & Accreditations
Standards developed by EN, ISO, AWWA, and ASTM cover a series of glass fiber reinforced pipe applications including conveyance of water, domestic wastewater and chemical substances. The common ground of all these standards is that all are performance-based. In other words, the performance tests required for the GRP pipe are defined in these standards. These standards include many quality control and performance tests.
EN:
This product standard is applicable for GRP pipes that have the diameter of 300 mm – 4000 mm, and that are used for water and wastewater conveyance applications. SUPERLIT GRP pipes meet the requirements of this standard.
EN 1796 for water supply with or without pressure
EN 14364 for drainage and sewerage with or without pressure
ISO:
This product standard is applicable for GRP pipes that have the diameter range of 300 mm – 4000 mm, and used for water and wastewater conveyance applications. It includes efficiency testing and complete product testing for pipes and couplings. It includes pipes of various stiffness classifications up to an operating pressure of 32 bar. SUPERLIT GRP pipes meet the requirements of this standard.
ISO 10467 for pressure and non-pressure drainage and sewerage
ISO 10639 for pressure and non-pressure water supply
ISO 10465 for installation procedures
SCOPE OF ISO SYSTEM DOCUMENTS:
GRP (GLASS FIBER REINFORCED PLASTIC) PIPE, COUPLING, FITTINGS, TANK, DESIGN AND PRODUCTION
AWWA:
AWWA is one of the comprehensive standards applicable for glass fiber reinforced pipes.
Within this standard, there are comprehensive specifications focusing on quality control and performance tests for the pipes and their joints that are used in pressure water pipeline applications. SUPERLIT GRP pipes are designed to meet the performance requirements of this standard.
Design principles of GRP pipes installed underground and above ground are defined in the AWWA M45 standard.
AWWA C950 for fiberglass pressure pipes. Refers to clean water conveyance.
AWWA M45 guide for fiberglass pipe design
ASTM:
There are various ASTM product standards used for various glass fiber reinforced pipe applications.
ASTM D3262 for fiberglass sewer pipe. Refers to non-pressure wastewater conveyance.
ASTM D3517 for fiberglass pressure pipe. Refers to clean water conveyance.
ASTM D3754 for fiberglass sewer and industrial pressure pipe.
Our Accreditations
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Quality Control & Performance Tests
Click here to download our Accreditation Certificate
Quality Control
Circumferential and axial load bearing capacities of the manufactured pipes are proven by routine tests. In addition, the structure and composition of the pipe are checked and verified by tests.
Controls during manufacturing phase
- Raw material control tests
- Barcol hardness
- Wall thickness measurement
- Pipe length measurement
- Outer diameter measurement
- Hydrostatic pressure test
Controls performed by taking samples
- Pipe stiffness
Being a physical property of the pipe, the specific stiffness is a measure of strength against ring deformation under external loads. Initial ring stiffness is the value obtained in N/m2 that is calculated by the formula below, when the pipe is tested in accordance with ISO 7685 and EN 1228, by applying a deflection of approximately 3%.
S0 = F* f / L * y
f = (1860 + (2500*y/dm))/100000
S0: Stiffness; N/m2
F: Applied Force; N
f: Deflection Factor
L: Sample Length; m
y: Vertical Deflection; m
dm: Average Diameter; m
Non-destructive deflection test with no structural damage
When the pipe sample is tested in accordance with ISO 10466, by implementing the following nominal deflections, it should meet the conditions in the table below.
Hoop tensile strength
When the samples that are cut out from the pipe are tested as per ISO 8521 and EN 1394, the results should comply with the minimum rating tables ranking in the international standards.
Axial tensile strength
When the samples that are cut out from the pipe in an axial direction are tested as per ISO 8513 and EN 1393, the results should comply with the minimum rating tables ranking in the international standards.
SUPERLIT GRP pipe manufacturing technology comprises a detailed quality control program. Compliance of the pipes and fittings production and their tests to international and local standards is ensured by this program.
Quality Control Tests
Before manufacturing, the raw material is tested. Tests aim to check the compliance, to the standards, of the raw materials and products (pipe, coupling and fittings) manufactured.
A hydrostatic pressure test simulating the operating conditions is applied to pipes with flexible connections and having diameters between 300 mm – 4000 mm.
Performance Tests
Coupling Performance Test
Couplings are tested under the conditions specified in EN1119, ISO8639 and ASTM D4161 standart to verify their performance.
Long-Term Tests
- Hydrostatic desing basis (HDB)
- Stress-Corrosion test
- Long-term ring stiffness (under wet condition)
- Long-term ring deflection test
Long-term tests, that take at least 10,000 hours, are performed to generate the design values and to maintain the extrapolation. In other words, the required physical parameters for a defined nominal 50-year design period are designated by using the ISO 10928 methods. In general, a minimum of eighteen samples are prepared and used to obtain a series of data distributed for the duration of the test. By using the least squares method, a logarithmic regression graphic is constituted from the test data. Performance values, corresponding to 50 years of service life for GRP pipes, should comply with the tables in the international standards.