Valve Maintenance Shutdown Planning and Turnaround Management

Planned maintenance shutdowns are the primary opportunity to inspect, repair, and replace critical valves. Effective turnaround planning reduces downtime and ensures all valve work is completed safely.

Valve Inventory and Criticality Assessment

Before a turnaround, classify all valves by criticality, maintenance history, and anticipated condition. Focus resources on valves with the highest consequence of failure or known problems.

• Safety critical valves: Overpressure protection, emergency isolation, fire valves

• Operability critical: Valves whose failure stops production

• Maintenance history: Valves with repeated failures deserve special attention

• Age-based: Valves beyond design life requiring inspection or replacement

Scope Development and Work Order Creation

Define the scope of work for each valve clearly. Work orders must specify the task, spare parts required, inspection criteria, and completion acceptance standard.

• Overhaul: Full disassembly, inspection, new seals and packing

• Inspection only: Disassemble and inspect; reassemble without replacement if acceptable

• Replacement: Remove existing valve and install new or refurbished unit

• Calibration: Positioner or actuator setting verification without disassembly

Spare Parts Management for Turnarounds

Order spare parts well in advance. Long lead items like exotic alloy trim and specialized packing materials must be on hand before the shutdown begins. Late parts cause schedule overruns.

• Seal kits: Body seals, packing, and soft seat kits for each valve type

• Actuator parts: Diaphragm, spring, O-rings for pneumatic actuators

• Trim kits: Seat, plug, and cage assemblies for control valves

• Lead time check: Specialty items may require 12-20 weeks; plan accordingly

Post-Turnaround Testing and Documentation

After repair, each valve must be tested and documented before returning to service. Pressure testing, leak testing, and functional testing confirm the work was completed correctly.

• Hydrostatic test: Body and seat tested to 1.5x MAWP

• Seat leakage test: API 598 acceptance criteria for the specified leakage class

• Functional test: Actuated valves stroked fully and response time recorded

• Documentation: Work order completion, as-left condition, and test results archived