Steelworks Decommissioning — A Case Study with RFID, Photo Documentation and 14 Days of Overrun

Client at a steelworks in northern Slovakia, March 2025. Old flat rolling line for stainless steel, in operation since 1987, definitively shut down. Our task: full decommissioning with reuse of ~35% of components (motors, gearboxes, electrical) as spare parts for a sister line in Hungary. Planned duration: 28 calendar days. Real duration: 42 days. This is a breakdown of why, including everything we would do differently today.

Tagging — Class 1 Gen 2 RFID vs hand-written labels

The first decision was how to track the 2,800+ components going into the spare-parts warehouse. Hand labels (waterproof polyester, A6, laser-printed) would have cost ~€0.40 each, but warehouse tracking would have stayed manual — operator reads the number, clicks in the WMS. With 2,800 parts and a typical 2–3% write-off error rate, that means 60–80 parts logged badly that nobody finds six months later.

Choice: EPC Class 1 Gen 2 UHF RFID tags (Impinj Monza R6-P chip), polyamide + epoxy encapsulation for thermal tolerance up to 200 °C.

What works, what doesn't

• Read range on a bare part (motor, gearbox): 4–6 m with an Impinj Speedway R420 reader + circular polarised antenna. Fine.
• Read range through a metal cover: ~0 m. Metal absorbs RF energy entirely. In practice that meant tags MUST be off metal surfaces — either on a sticker with a foam spacer (3M VHB 4926 or TagSurance UHF on-metal pad, 5 mm thick) or entirely off-metal on a hanging plastic label.
• Read range through oil and grease: almost unchanged. Oil is RF-transparent.
• Read range through water: catastrophic. Wet components after washing had to dry 2–4 hours before tag reading. That added a logistics layer we hadn't planned for.

Tagging cost (real)

• RFID tags (on-metal, IP67): €1.10–1.80 each × 2,800 = €3,500.
• Stationary reader (Impinj Speedway + 2× antenna): €2,200. Handheld reader (Zebra MC3300xR gun): €2,400.
• Software integration into the SAP MM module (custom ABAP wrapper around the RFID API): €8–12k engineering.
• Tag application on a component (cleaning + bonding + check): 3–7 min/piece × 2,800 = ~250 hours × €25 = €6,250.

Total RFID infrastructure: ~€22–25k.

With hand labels it would have been ~€3–5k. But RFID paid back inside 8 months thanks to faster warehouse stocktakes — instead of 3 days × 4 people of manual count, now 4 hours × 2 people with a walkthrough scan.

Photo documentation — the protocol nobody writes

The second stumbling block: photo documentation. The client originally wanted "a few photos for the record." We arrived with a protocol — and still expanded it twice during the project.

Final per-component protocol

1. 1.Overall view before disassembly from 4 cardinal directions + top view. 5 photos minimum.
2. 2.Detail of the nameplate (Schild) with visible serial number, legible. If the plate is corroded/illegible, write the data next to it in chalk + take another photo.
3. 3.Detail of the mounting interface before disconnection (terminal block, drive shaft, hose, anchoring). At least 2–3 photos depending on interface complexity.
4. 4.Photo before lifting with visible lifting points and crane attachment.
5. 5.Photo after disassembly of the component on a clean surface with a scale object in frame (1 m aluminium rod or folding measure in shot).
6. 6.GPS metadata in EXIF on every photo — automatic via Garmin GLO 2 paired with iPhone/Android. At the sister-line install in Hungary that metadata saved 3–4 days of "where did this sit in the old hall."

Minimum 8 photos per component. 2,800 components × 8 = ~22,400 photos. That's 3–4 hours a day for a dedicated photo documenter who does nothing else. We actually had 2 people full-time on documentation.

Software workflow

• Capture: Adobe Lightroom Mobile + custom preset (no RAW, JPEG fine, GPS on, watermark with tag ID).
• Sync: cloud (Lightroom Mobile → our own S3 bucket via Lambda hook).
• Tagging: after upload each photo is matched to the RFID tag ID via a QR code in frame (on a flexible board the photo documenter holds during the shot). A QR code in every frame is non-negotiable. Without it you lose 30–40% of matching.
• Sorting and archive: into a Synology DSM Photos server, with metadata in Postgres.

Real cost of the photo documentation bundle for the project: €18–22k (2 people × 42 days + software + storage). In the first deck the client budgeted €3–5k. That's the difference that hit him — but six months later, when the sister setup started in Hungary, photo documentation saved an estimated €80–120k in engineering hours of reconstruction from the unknown.

14 days of overrun — anatomy

The plan was 28 days. The reality was 42. Here's the breakdown of where the days went:

Days 1–3: Discovery and surprises (+2 days)

Planned scope: 280 hours of the team mapping the real state. Surprises:

• Machine 4 (straightening stand) was not in the drawings but stood on the line. Nobody remembered when or why it had been added (~1996 by weld style). Documentation lost. +8 hours for extra survey + photos.
• Cable runs in the floor. The client said "we have drawings." They did. From 1987. 60% of cables in floor ducts didn't actually run as the drawings showed. +24 hours for re-mapping via metallic cable locator and GPR (Ground Penetrating Radar) — €4,200 extra to rent GPR.

Days 4–7: Safety isolation (on plan)

LOTO procedures, decommissioning, isolation of media (steam, water, air, hydraulics), draining of hydraulic circuits (4,500 l mineral oil → certified disposal, €8,500), pneumatic depressurisation. Nothing was lost here.

Days 8–18: Mechanical disassembly (+4 days)

Plan: 11 days. Real: 15.

• Seized bolts. After 38 years of operation, the M36 anchor bolts of the rolling stand have a layer of corrosion + thermal seizure. Manual pneumatic pullers don't cope. We needed Enerpac hydraulic bolt tensioners (up to 90 kNm torque) + an induction heater to 250 °C to create thermal expansion. Set rental from Hydratec: €6,200/week, used 2 weeks. +€12,400 extra.
• Asbestos gaskets. In the steam circuit we found the original 1987 gaskets — Klingerit Sil C-4400 with asbestos filler. As if cut from a textbook chapter "why decommissioning old industrial lines never has a plan A." Stop work, mandatory notification to ÚVZ SR, waiting for approval of the removal procedure with a certified firm (Saneko, EMS Slovakia). +5 days of pure delay, €18–22k for certified removal of 14 kg of asbestos-containing material. In reality the most expensive 5 days of the whole project.

Days 19–26: Electrical disassembly (+3 days)

Plan: 8 days. Real: 11. Main reasons:

• Cables without labels. The cable rack in the main switchboard had original 1987 labels cracked and mostly illegible. Before disconnecting every feeder we had to do manual tracing via Fluke 2042 cable locator or via an inductive tester. +18 hours for a pair of electricians.
• One cut cable. Classic. On day 22 one of the technicians, dismantling a cable tray, cut the main control cable 12×1.5 mm² between the PLC cabinet and the hydraulic power unit before the power unit isolation was complete. The cable was part of the emergency STOP circuit for downstream hydraulic equipment, which still had a pressurised accumulator. No injury, but an OHS incident → 4-hour stop, documentation, root-cause analysis. From that came the protocol for all future projects: every cable is first tested with a signalogram (tone generator + audio probe) BEFORE cutting, even if labelling shows it isolated.

Days 27–30: Haulage and sorting (on plan)

No surprises. Iron to scrap (~410 tonnes × €170/t = €69,700 revenue), non-ferrous metals (~28 tonnes × €1,800/t = €50,400), electronics (separately, ~€4,200), hydraulic oil (assessed as contaminated, €8,500 disposal, see above).

Days 31–42: Re-export to Hungary + final documentation (+5 days)

• Planned time: 4 days for loading and transport. Real: 6 days, due to the oversized load (rolling stand 12.8 t, width 4.2 m) → need for a special transport permit via the National Motorway Company, lead time 3–4 working days. +2 days.
• Final documentation (RFID database export, photo library, BOM, material certificates) — planned for 3 days, real 6. +3 days. Reason: during disassembly we added ~280 ad-hoc photos and 60 hand sketches of "surprises" that had to be archived and indexed.

Final cost analysis

The client budgeted net cost ~€60k. Real: €189k. 3.15× over budget.

What we would do differently today

If you're asking whether the project ended in a loss — it didn't. The client paid under the fixed contract + change orders, and the documentation saved the sister line in Hungary ~€100–150k. But if we were doing a similar project today:

1. 1.5-day discovery phase instead of 3. Including GPR scanning from day 1. Pre-project asbestos screening (Z3 sampling, accredited lab ~€800–1,200) — MANDATORY for anything pre-2000.
2. 2.+30% schedule buffer off plan for lines > 25 years old. Assume 2–3 undocumented modifications.
3. 3.RFID protocol including "on-metal" tags priced in from the start, not as an add-on.
4. 4.Photo documentation as a separate line item with a dedicated team of 2 people full-time, not as a side job for fitters.
5. 5.Cable tracing BEFORE every cut — without exception, even if labelling shows isolated.
6. 6.Special transport permits requested on day 1, not day 28.

The hidden profit of decommissioning

The least documented benefit of decommissioning is not the scrap revenue. It's diagnostics on sister lines. The client had a line in Hungary from the same era, still in operation. Our photo documentation + RFID inventory showed 3 components (one main motor, two planetary reducers) that were in such a state on the Slovak line that they indicated imminent failure on the Hungarian line too. Preventive replacement was done — saved an estimated €280–340k in unplanned outage. That's not in the deck. But it's the reason serious firms commission decommissioning as part of a predictive-maintenance roadmap, not just as a disposal process.

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*We write this as a technical partner that has decommissioned 40+ industrial lines over the last 12 years. If you have a decommissioning ahead of you with a budget < €100k, the first consultation (90 minutes) walks through these cost categories that usually don't show in the first quote and gives you a realistic estimate — including asbestos risk assessment and discovery scope.*