Sand blasting test procedure
GJB150.12A-2009, titled "Environmental Testing Methods for Military Equipment – Laboratory Part 12: Sand and Dust Test," outlines a detailed procedure for simulating sand and dust conditions in laboratory settings. The following steps describe the sand blowing process as specified in the military standard for sand and dust testing equipment:
1. Position the test specimen at the designated distance from the sand injection point and adjust the airflow speed according to the technical specifications provided. This ensures that the test conditions align with the requirements of the standard.
2. Allow the specimen to stabilize at the temperature specified in section 4.3.3.3 of GJB150.12A-2009. Maintaining the correct temperature is essential to ensure accurate simulation of real-world environmental conditions.
3. Adjust the sand supply to achieve the required sand concentration or the weight flow rate determined through pre-test calibration. This step is critical to ensure consistent and repeatable test results.
4. Sustain the three conditions—positioning, temperature, and sand concentration—for the duration outlined in the technical documentation. If necessary, reorient the test specimen every 90 minutes so that all sensitive surfaces are exposed to the sand flow. Repeat the previous steps accordingly to ensure comprehensive coverage.
5. If the test piece needs to operate during the sand and dust test, monitor its performance during the final hour of the test and document the results. If no operation is required, proceed to the next step.
6. Return the test specimen to standard atmospheric conditions and remove any accumulated sand using methods such as brushing, wiping, or shaking, which are expected to be used in actual applications. Handle the specimen carefully to avoid introducing additional sand into the system.
7. Inspect the test results based on the technical documents and record the findings. This includes evaluating the performance and integrity of the test piece under simulated conditions.
8. Conduct a visual inspection of the test piece to assess the effects of abrasion, blockage, and any signs of sand penetration. Document all observations to provide a complete record of the test outcome.
This procedure is designed to evaluate the durability and reliability of military equipment under harsh sand and dust conditions, ensuring it can perform effectively in real-world environments.
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