Gas is extracted from the ground in a highly pressurized state. When an installation is in full operation, all pipes and storage facilities are under high pressure. Pressures of up to 200 bar are not exceptional.Guidelines for the Oil and Gas industry, Health Safety Environment.
How does it works.
Be aware that every country and company has its own and maybe other regulations.
Please ask them before you start the activities and that you understand them.
http://www.ktma.nl/uk/
