Dimensional Measurements
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Mechanical Testing
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Thermal Analysis
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Hydrostatic Strength
Plastic piping systems are mainly designed for a lifetime of at least 50 years. This requires hydrostatic pressure testing not only in the design phase (in order to qualify the compound, see ISO 9080 testing) but also at regular intervals as batch release, audit or type testing. The determining test conditions are: temperature, hoop stress and time.
Eventually a pipe’s resistance to slow crack growth (SCG) can be evaluated by making grooves in the pipe’s outer surface in a standardised manner. This is the so called “notch pipe test (NPT)”.
The pipe can also be filled with a specific solution to determine it’s resistance to any gas condensates that may have formed (gas condensate test).
Becetel® is a highly valued test facility in this field. We have about ten water baths and several hundred pressure stations at our disposition, have experience with a wide range of polymers (PE, PP, PVC, PA, PEX, GRP) and can evaluate pipes and assemblies ranging from ø8 mm to ø900 mm in diameter.
The test we perform:
- Resistance to hydrostatic pressure (ISO 1167, EN 917, ISO 13846)
- Notch pipe test (NPT) – Slow Crack Growth (ISO 13479), including accelerated NPT
- Gas condensate test (ISO 4437 annex A, EN 1555-1 annex A, ISO 17885)
With these tests you can verify the predicted lifetime of your product.
Impact Testing
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RCP
Rapid crack propagation (RCP) is a phenomenon in which a long fast-moving brittle crack can propagate in a material body. Cracking of glass plates and frozen lakes is an example of RCP. In thermoplastic pipes these fast-running cracks may propagate along a substantial length of the pipeline, resulting in considerable damage and repair costs.
The RCP-S4 test determines the arrest or propagation of a crack initiated in a thermoplastic pipe at a specified temperature and internal pressure.
Thanks to our former full scale test site we have extensive experience in performing rapid crack propagation (RCP) tests. So far that we could substitute the full-scale test with the smaller S4 (Small Scale Steady State) test by correlation. Becetel® has developed its own test rig for this.
The test we perform:
- RCP-S4 Small Scale Steady State test (ISO 13477)
This test is of particular importance for the performance of thermoplastic pipes intended for the supply of gaseous fuels. The faster the crack stops, the more the fire and explosion hazard can be controlled.
Stress Crack Resistance
Stress cracking is a failure of the polymer material due to surface initiated micro cracks caused by tensile stresses, often lower than the short-term mechanical potency of the material.
Slow crack growth (SCG) is another term commonly used to describe stress cracking. It has become a critical polyethylene material property, as the enhanced resistance to slow crack growth is a defining characteristic of the current “RC” generation of crack-resistant materials.
Some tests are performed on samples based on granulates or regrind material, while others are performed in the form of pipes. Mainly a surface active wetting agent is used to accelerate the test lead time.
The test we perform:
- Full Notch Creep Test (FNCT) (ISO 16770)
- Accelerated Full Notch Creep test (AFNCT) (ISO 16770)
- Notched Pipe Test (NPT) (ISO 13479)
- Accelerated notched pipe test (ANPT) (ISO 13479)
- Cone test (ISO 13480)
- Strain Hardening Modulus (ISO 18488)
With this series of tests, Becetel is responding to the increasing use of PE-RC grades.
