Before certain jobs on an installation can begin, the installation (or relevant parts) must first be safeguarded. That means ensuring that the installation is free of liquid and gas and depressurized. Safeguarding is the responsibility of the operator. With this the Operations department provides a safe workplace. So liquids and gases are confined to where they belong: in pipes and installations on which no work is scheduled.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/
