Health, Safety and Environment (HSE) topics are presented in PetroEd’s HSE Library, which addresses safe work practices on a rig or platform. Cranes are used everyday on offshore platforms, which makes working safely with and around cranes important for crane operators and rig personnel. H2S is commonly associated with decaying organic matter, and can be produced during rig operations. It is important for all rig workers to be familiar with characteristics, safety equipment, and treatment in the event of a H2S leak. Radioactive materials are another concern for petroleum industry personnel, as production operations can easily become contaminated with NORM, posing health risks for workers. In the event of an accidental oil spill, accurately estimating the volume of oil spilled is vital to reporting and management of accidental release.