What must be established prior to making repairs on an isolating system to prevent the escape of pressurized fluid?

Establishing a pressure barrier is crucial prior to making repairs on an isolating system. This allows for safe maintenance by ensuring that the pressurized fluid remains contained within its designated pathways while repairs are underway. A pressure barrier typically involves shutting off valves and possibly using blind flanges or other equipment to securely isolate the section of the system being worked on. This prevents any unintended release of fluid, which could result in hazardous situations for personnel or damage to equipment.

While safety barriers, fluid containment measures, and leak detection systems are also important components of overall safety and operational integrity, they serve different purposes. Safety barriers focus more on protecting personnel and preventing access to dangerous areas. Fluid containment is aimed at capturing any leaks that might occur, and leak detection is intended to identify and alert personnel about the presence of leaks once they occur. However, without first establishing a pressure barrier, the risk of pressurized fluid escaping during maintenance activities remains significant.