The Indian Fertiliser Industry comprises of several large scale ammonia and urea plants. Many of the plants are over 10 years old. As the plants age the management of process safety knowledge becomes critical to avoid incidents. As personnel retire or resign from the organization their knowledge walks away with them. Here there is a need for a robust process safety knowledge management system to capture and disseminate process safety knowledge. This article discusses various aspects of process safety knowledge management in ammonia and urea plants.