For you search query Gn7 we found around 173646 songs. We may show you only some of them on this page. BCGA GN 7 – Revision 3. PREFACE. The British Compressed Gases Association (BCGA) was established in l, formed out of the British. Question: Are Mineral Companies required to comply with the risk analysis referred to in Rule (5)?. Answer: This is not compulsory but Mineral Companies.