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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 existing natural gas systems and monitor their performance. They must also stay up to date on safety and industry standards. Customer service skills are essential in this field, since they work directly with customers. They also need to be organized and possess good time management skills. NVQ (National Vocational Qualification) A National Vocational Qualification (NVQ) is a set lear