氨氮试验的执行过程涉及在波纹板表面喷涂黄色显影剂，并在IBS空间（主保温屏蔽空间）内注入氨氮混合气体，维持正压环境。当氨气在焊接缺陷处泄漏时，与显影剂接触即发生颜色变化，实现漏点的精确定位。此检测方法的灵敏度远超传统渗透检测，为储罐的安全运行提供了坚实的保障。
值得一提的是，LNG薄膜罐技术代表了液化天然气大型储罐领域的前沿技术水平。该项目也是大港油建公司乃至管道局首次承接的大型LNG薄膜罐项目。为确保项目的高质量完成，大港油建公司提前做好硬件投入和人员技术储备，建设完成MarkⅢ型陆地薄膜罐模拟舱，并于2023年取得法国GTT公司颁发的认证证书，相关人员也通过了资格考试认证，具备了承揽该项目的准入资格。项目施工中，团队全体参建人员不畏艰难，边干边学边研究边提升，成功克服了施工中的重重挑战，完成了从理论到实践的蜕变。
This test is a key step in eva luating the tightness of the membrane tank, and its results directly reflect the construction quality of the membrane system of the inner tank. In this test, tank 7, operated by Dagang Oil Construction Company, performed well, with only 48 leak points found, significantly lower than the 100 leak point standard set by French GTT company. In the same period of the second and third stage of 6 film tank tests, tank 7 ranked first with excellent results. This test not only verified the excellent quality and performance of the main shielding layer of the film tank, but also demonstrated the strength of Dagang Oil Construction Company in management and construction technology.
The execution process of the ammonia nitrogen test involves spraying yellow developer on the surface of the corrugated plate and injecting ammonia nitrogen mixture into the IBS space (the main insulation shielding space) to maintain a positive pressure environment. When the ammonia gas leaks at the welding defect, the color changes when it contacts with the developer, and the accurate location of the leak point is realized. The sensitivity of this detection method is much higher than that of the traditional penetration detection, which provides a solid guarantee for the safe operation of the storage tank.
It is worth mentioning that LNG thin film tank technology represents the cutting-edge technology level in the field of LNG large storage tanks. This project is also the first large-scale LNG thin film tank project undertaken by Dagang Oil Construction Company and even the Pipeline Bureau. In order to ensure the high-quality completion of the project, Dagang Oil Construction Company has made hardware investment and personnel technical reserve in advance, completed the construction of Mark III land film tank simulation cabin, and obtained the certification issued by GTT Company of France in 2023, and the relevant personnel have passed the qualification examination certification, with the access qualification of the project. In the construction of the project, all the team members were not afraid of difficulties, and they successfully overcame many challenges in the construction and completed the transformation from theory to practice.
