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What Qualifications Do You Need to Become a Qualified Gas Engineer? A qualified gas engineer can design and develop natural gas delivery systems. They also troubleshoot and monitor existing natural gas systems. They must also be up to date on safety and industry standards. Since they interact directly with clients, skills in customer service are vital. Additionally, they require an organized and time management skills. (National Vocational Qualification) A National Vocational Qualification (NVQ)