1. Ensure the system or pipeline is clean and free of debris. Check that all valves and fittings are tightened before starting the test. 2. Fill the system with nitrogen gas at the correct pressure using nitrogen cylinders or a nitrogen generator. Monitor the pressure with gauges. 3. Use tools like leak-detection solutions or electronic sensors to find any leaks. Look for escaping gas, which may appear as bubbles or cause pressure drops. 4. If a leak is found, isolate and repair the affected part. This may involve tightening, sealing, or replacing components. 5. After repairs, re-pressurize the system with nitrogen and check again for leaks. Once confirmed leak-free, the system can be returned to service.