The scope of maintenance activities, both preventive and corrective, for valves, actuators, and supports includes the following tasks:
• Inspection, repair, and bench testing of line valves: globe, gate, check, butterfly, ball, diaphragm, zero-leak, etc.
• Bench testing and memory recording.
• Inspection, repair, and adjustment of automatic valves: control bypass etc.
• Inspection repair and calibration both on the bench and “in situ,” of safety valves: relief,relief-safety safety pilot-operated valves.
• Inspection repair and adjustment of special valves: combined turbine stop control boiler isolation main steam isolation pressurizer safety three-way etc.
• Mechanical inspection and adjustment of pneumatic hydraulic manual actuators.
• Inspection review adjustment rigid supports flexible supports dampers.