A crew that arrives at an exchanger with a complete work pack can start work within minutes: the isolations are listed, the permits are prepared, the gaskets and bolts are in a labeled kit, the crane is booked and the inspection points are marked. A crew without one spends the first hours finding drawings, chasing parts and waiting for decisions. Mechanical work packages during plant shutdowns are what separate those two outcomes. This guide covers what a mechanical work pack contains, the typical packages in a shutdown and how planners prepare them.
What is a mechanical shutdown work package?
A mechanical shutdown work package is a complete set of instructions, information, materials and requirements for one mechanical job, prepared before the shutdown so that the crew can execute it safely and efficiently without improvising.
Typical mechanical packages
- Heat exchangers: opening, cleaning, inspection, repair and reassembly
- Columns and vessels: manway opening, tray and internals inspection, repairs and box-up
- Valves: overhaul, replacement and relief valve removal, testing and reinstallation
- Rotating equipment: pump and compressor overhauls, coupling and seal work, alignment
- Piping: spool replacement, line breaking and flange management
- Fired heaters: tube inspection, burner maintenance and refractory repair
Exchanger packages are among the most detailed and are covered separately in heat exchanger maintenance during turnarounds.
What a work pack contains
| Section | Content |
|---|---|
| Job scope and steps | What will be done, broken into steps with estimated hours |
| Isolation details | Isolation points, blinds and their numbers from the blind list |
| Permits | Permit types needed and any special conditions |
| Drawings and data | P&IDs, general arrangements, datasheets, vendor manuals |
| Materials | Gaskets, bolts, spares and consumables, kitted and labeled |
| Tools and equipment | Special tools, torque or tensioning equipment, lifting gear |
| Access and lifting | Scaffold requirements and crane bookings |
| Inspection and QC points | Hold points, witness points and test requirements |
| Safety | Job safety analysis, specific hazards and precautions |
| Acceptance and box-up criteria | What must be true before the job is closed |
| Records | Check sheets and test forms to be completed |
Preparing work packs
- Start from the frozen scope. Each approved item from shutdown scope development becomes one or more packs.
- Walk the job in the field. Confirm access, isolation points, scaffold needs and equipment condition with the people who will supervise the work.
- Estimate by step. Step-level estimates support scheduling and progress measurement.
- Kit the materials. Assign materials to each pack and stage them by job.
- Review. Supervisors, inspectors and safety staff check each pack before approval.
- Control revisions. Only the approved revision goes to the field.
Example: a pump overhaul package
- Electrical and process isolation, drain and flush, with blind numbers recorded
- Record as-found alignment readings before the coupling is removed
- Remove the rotating element or pump and transfer it to the workshop
- Inspect, then replace the mechanical seal, bearings and wear parts as found necessary
- Reassemble to the vendor’s clearances and record measurements
- Reinstall, align and check pipe strain, recording final readings
- Remove isolations under permit and hand back for a test run after startup
Each step carries its own hours estimate, materials and record sheet, which is what makes the package usable for scheduling and progress tracking as well as for the crew.
Common work pack weaknesses
- Isolation details copied from an old pack without field verification
- Material lists that miss gaskets or bolts for less obvious joints
- No allowance for likely discovery work
- Inspection points missing, so inspectors are called late
- Box-up criteria vague, so jobs reopen during leak testing
Work packs and records
The check sheets in each pack become the record of what was done. Completed packs feed the quality records described in inspection and quality controls during shutdown maintenance and the close-out steps in closing out shutdown work packages. The skills needed to execute these packs are outlined in mechanical maintenance skills needed in process industries.
Apex Core Engineering supports work pack preparation through its project support services and supplies mechanical crews to execute them.
Frequently asked questions
Who prepares shutdown work packs?
Shutdown planners, with input from maintenance supervisors, inspectors, operations and safety staff, who review and approve each pack.
Why should work packs be field-verified?
Because drawings and old packs may not reflect current plant conditions, especially for isolation points, access and equipment details.
How detailed should a work pack be?
Detailed enough that a qualified crew can complete the job safely without improvising, with steps, materials, isolations, permits and inspection points defined.
Get support preparing shutdown work packs from Apex Core Engineering.