Here’s a high‑level breakdown of the typical “Skids Assembly” stage in a process‐equipment project. Depending on your industry (oil & gas, chemical, water treatment, etc.) and your company’s procedures, you may adapt or expand these steps—but this should serve as a solid template.

1. Preparation & Planning

1. Review of Design & Documentation

   • Fabrication drawings & isometrics

   • Piping and instrument diagrams (P&IDs)

   • Electrical & instrumentation cable schedules

   • Mechanical datasheets (pumps, valves, vessels)

2. Materials & Parts Verification

   • Structural steel skid frames

   • Pre‑spooled pipe spools & fittings

   • Equipment loose‑items (pumps, instruments, skids‑mounted panels)

   • Cable trays, junction boxes, conduits

2. Mechanical Fit‑Up

1. Skid Frame Assembly

   • Align and weld structural members; check flatness and level.

   • Apply primer or protective coating to welds as needed.

2. Equipment Mounting

   • Bolt or weld major items (pumps, vessels, heat exchangers) to the frame per mounting pads.

   • Torque‐check anchor bolts.

3. Pipe Spool Installation

   • Position and tack‑weld spools in sequence, following isometric tags.

   • Confirm piping routings avoid interference and allow access.

3. Welding, NDT & Coating

1. Welding

   • Complete all groove and fillet welds.

   • Maintain weld procedure specs (WPS) for material and thickness.

2. Non‐Destructive Testing (NDT)

   • Radiography, ultrasonic, Dye Penetrant or MPI as per code.

   • Document all inspection reports.

3. Coating & Insulation

   • Blast profile check.

   • Apply intermediate and finish coats.

   • Install pipe insulation and jacketing if required.

4. Electrical & Instrumentation

1. Cable Tray & Conduit Installation

   • Secure trays to skid structure; maintain cable bend radii.

2. Panel & Junction Box Mounting

   • Install control panels, marshalling racks, junction boxes.

   • Label per cable schedule.

3. Wiring & Terminations

   • Pull and dress cables; terminate per schematics.

   • Perform continuity & insulation resistance tests.

4. Loop Checkout

   • Energize instrument loops; verify 4–20 mA, digital communications, HART.

5. Pre‑Commissioning & FAT Preparation

1. Hydrostatic & Pneumatic Testing

   • Pressure‐test piping at specified test pressures; monitor for leaks.

2. Functionality Checks

   • Rotate motors by hand; verify alignment.

   • Operate valves, actuators, relief devices.

3. Instrumentation Calibration

   • Calibrate pressure, temperature, flow instruments against traceable standards.

4. FAT Documentation Package

   • As‑built drawings & as‑built cable schedules

   • NDT reports, weld maps

   • Test certificates (hydro, paint, insulation, calibration)

   • Operation & maintenance (O&M) manuals

6. Factory Acceptance Test (FAT)

• Witnessed Testing by client / 3rd‑party inspector

• Performance Runs under simulated process conditions

• Punch‑list Closure—any discrepancies are logged, rectified, and re‑tested

• Sign‑off & Release for Packing

7. Packing, Preservation & Dispatch

• Drain & Dry all piping and equipment

• Corrosion Protection—VPI or VCI film inside tight spaces

• Crating & Skid Lifting—fit shipping skids, apply lifting lugs, provide rigging plan

• Shipping Documentation—packing list, shipping marks, customs paperwork

Key Deliverables & Checks

• Checklists/Inspection Hold Points at each major stage

• Traceability for materials, welders, and inspectors

• Quality Plan alignment with ISO 9001 / client QAP

• Health, Safety & Environment (HSE) compliance—Lifting plans, hot‐work permits, confined space

Tips & Best Practices

• Modular Sequencing: Group related disciplines (e.g. all piping fit‑up before welding) to minimize re‐work.

• Collaborative Walk‑downs: Mechanical, piping, E&I leads walk the skid together pre‑FAT to catch clashes.

• Digital Tracking: Use a common data‑environment (CDE) to track RFIs, submittals, NCRs, and punch‑lists.

• Training & Sign‑offs: Have each discipline sign off its scope—creates accountability and helps on‑site commissioning.