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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 can also troubleshoot existing natural gas systems and supervise their performance. They must also be up-to-date regarding safety and industry standards. Since they are directly involved with clients, skills in customer service are crucial. In addition, they need excellent time management and organisation competencies. NVQ (National Vocational Qualification). A National Vocational Qualification (NVQ)