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.