Back-groundThe latest design is an updated and enhanced performance version of an original mach
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The latest design is an updated and enhanced performance version of an original machine, first manufactured in 2008. The design is ATex Zone 2 compliant.
The test rig incorporates two crank assemblies, driven by a variable speed motor, providing reciprocating motion, in two separate test chambers. The reciprocating assemblies are 180 degrees out of phase, providing a degree of primary balancing.
Each assembly incorporates tandem sealing ring cassettes, with one seal pack on the high-pressure side and one on the low-pressure side, with a small void in between. For the inner seal, between the hydrogen chamber and the nitrogen chamber, this void is pressurised with nitrogen and continuously purged. Controlling the pressure of the nitrogen allows the hydrogen leakage rate through the seals to be controlled and the continuous purging ensures that any leakage is safely discharged.
| Test Chamber Gases: | H2 |
| Natural Gas | |
| Air | |
| N2 | |
| Containment Chamber Gas: | N2 |
| Maximum Test Chamber Pressure: | 5 bar |
| Maximum Purge Pressure: | 5 bar |
| Test Pressure – Containment Pressure: | 0.5 bar (Typical) |
| Contact Configurations: | Area Contact |
| Line Contact | |
| Ball on Flat | |
| Area Contact Specimen: | Ø18 mm with hemispherical seat |
| Minimum Load: | 30 N |
| Maximum Load: | 500 N |
| Maximum Friction Force: | 200 N |
| Frequency/Stroke: | 50 mm at 20 Hz |
| 100 mm at 10 Hz | |
| 150 mm at 7.5 Hz | |
| 200 mm at 5 Hz | |
| Maximum Frequency: | 20 Hz |
| Maximum Plate Temperature: | 150 °C |
| Heating: | Non-contact Radiant |
| Load Control: | Servo Valve x 2 |
| Load Feedback: | Strain Gauge Load Cell x 2 |
| Friction Force: | Piezo Transducer x 4 |
| Mätning av slitage | Capacitance Probe x4 |
| Plate Specimen Temperature: | Pyrometer x 4 |
| Inner Chamber Temperature: | PT 100 x 2 |
| Chamber Pressure: | Pressure Transducer x 4 |
| Motor: | 7.5 kW a.c. servo motor and drive |
| Interface: | USB Serial Link Interface Module |
| Software: | COMPEND 2000 |
| COMPEND Controlled Parameters | Frequency |
| Provningstid | |
| Load Chamber 1 | |
| Specimen Temperature – Chamber 1 | |
| Nitrogen Pressure – Containment Chamber 1 | |
| Load Chamber 2 | |
| Specimen Temperature – Chamber 2 | |
| Nitrogen Pressure – Containment Chamber 2 | |
| PLC Controlled Parameters | Purging |
| Leak Testing | |
| Charging with Process Gas | |
| Venting | |
| Manually Set Parameters | Reciprocating Stroke Length |
| Hydrogen Pressure | |
| Inner Seal Back-pressure (Nitrogen) | |
| Measured Parameters | Frequency |
| Provningstid | |
| Load x 2 | |
| Friction x 4 | |
| Wear Displacement x 4 | |
| Specimen Plate Temperature x 4 | |
| Chamber Pressure x 4 | |
| Chamber Temperature x 2 | |
| Services | |
| Electricity: | 380/415V, three phase 50/60 Hz, 13 kW |
| Process Gas System: | Not included |
| ATex Rating | The machine, drive motor and associated instrumentation are ATex rated. The power module and PC control and data acquisition system are not ATex rated. It follows that these items must be installed outside any ATex rated test cell, with suitable ATex rated connections between the operator work-station and the test cell. |
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