Singapore legislation
Regulation 65
of Workplace Safety and Health (Shipbuilding and Ship-Repairing) Regulations 2008
Regulation 65
Welding and cutting on containers that held flammable substances
Where any operation involving welding or cutting is carried out in a shipyard or on board a ship in a harbour on any container that has held any explosive or flammable substance or in which flammable gases may have been generated, it shall be the duty of —
the employer of any person who carries out the operation; or
the principal under whose direction any person carries out the operation,to ensure that no such operation is carried out on the container unless —
the container has been thoroughly cleaned by steam or other equally effective means and is completely free from combustible gases or vapours; or
the atmosphere in the container has been rendered non-flammable or non-explosive.