Over 60% of operating cement plants worldwide were built before 2000 — running kilns, mills, and crushers that pre-date modern condition monitoring, some of them pushing 30 to 40 years of continuous operation. These plants aren't waiting for a greenfield rebuild. They need maintenance transformation now, on equipment that's already deep into its lifecycle, with control systems that range from modern DCS to hardwired relay logic. The retrofit question isn't whether to modernize maintenance — it's how to do it without shutting down the kiln. Oxmaint's brownfield retrofit approach delivers CMMS and predictive maintenance capability on legacy cement equipment within 90 days, without replacing a single process control system. Book a 30-minute walkthrough to see how the retrofit maps to your equipment age and control architecture.
Case Study · Brownfield CMMS Retrofit
Predictive Maintenance on 30-Year-Old Cement Equipment — Without Replacing Your Control System
Legacy kilns, mills, and coolers produce measurable signals that predict failure weeks in advance. The gap isn't sensor technology — it's connecting those signals to a CMMS that acts on them. Here's how brownfield plants close that gap.
64%
Reduction in unplanned downtime events
90
Days to full predictive monitoring coverage
31%
Reduction in total maintenance spend
0
Process control changes required
The Brownfield Reality: What You're Actually Working With
A brownfield retrofit doesn't start with a clean slate. It starts with a 25-year-old kiln, a legacy SCADA system that may or may not have OPC-UA capability, a maintenance team trained on paper work orders, and equipment that may be three or four generations of technology behind what a new plant would install. That's not a barrier — it's the starting point. Oxmaint's retrofit architecture is specifically designed around what brownfield plants actually have, not what a greenfield spec would have chosen.
What You Have
Typical brownfield cement plant
10–40 year old rotating equipment with partial sensor coverage
Legacy SCADA — Siemens, Rockwell, ABB, or older OPC-DA systems
Paper-based or early-generation CMMS work orders
Maintenance history in paper records, spreadsheets, or disconnected systems
Assets near or past original OEM design life
What You Need
Retrofit targets, no rip-and-replace
Wireless vibration and thermal sensors on critical assets without SCADA changes
OPC-DA bridge or MQTT edge retrofit to connect legacy control data
CMMS with pre-built cement asset taxonomy to reduce configuration time
Historical data migration to seed predictive baselines
Remaining useful life calculation to guide capital planning
The 4-Track Retrofit Architecture
Brownfield plants rarely fit a single integration pattern. Equipment age, SCADA platform, and sensor coverage vary across process areas within the same plant. Oxmaint's retrofit connects across four data tracks simultaneously — pulling from whatever your plant actually has.
01
OPC-UA from Modern SCADA
For process areas with Siemens PCS7, Rockwell FactoryTalk (post-2015), ABB 800xA, or Schneider EcoStruxure — native OPC-UA subscription. No changes to PLC logic or SCADA screens.
Covers: 78% of assets in modern brownfield plants
02
OPC-DA Bridge for Legacy SCADA
For older SCADA installations (pre-2015), a small OPC-DA to OPC-UA wrapper on an on-site edge gateway extracts alarm and process data without touching control system configuration.
Covers: Legacy Wonderware, iFIX, WinCC installations
03
MQTT Wireless Sensor Retrofit
For assets with no existing SCADA coverage — older conveyors, auxiliary drives, bucket elevators — wireless vibration, temperature, and acoustic sensors connect via MQTT / Sparkplug B without any hardwired infrastructure change.
Covers: Assets outside original control system scope
04
Historian SQL / REST API
For plants with OSIsoft PI, GE Proficy, or Honeywell Uniformance historians — batch and event data accessed via REST API to feed predictive baselines and condition trending.
Covers: OSIsoft PI, GE Proficy, Honeywell Uniformance
Retrofit by Asset Age: What Each Generation Needs
Equipment Age
Typical Condition
Retrofit Approach
CMMS Priority
0–10 Years
Modern sensors, partial SCADA coverage, recent PM records
OPC-UA direct integration, import existing CMMS history
Optimize PM intervals, condition-based triggers
10–20 Years
Mixed sensor coverage, legacy SCADA, paper and digital records
OPC-DA bridge + MQTT retrofit on uncovered assets
RUL calculation, spare parts catalogue rebuild
20–30 Years
Minimal sensors, older control systems, mostly paper history
Wireless sensor retrofit on all critical assets, historian pull
Capital planning, lifecycle end-of-life projection
30+ Years
Near or past design life, significant paper maintenance records
Full wireless sensor deployment, manual baseline entry for uncovered history
Replacement timing, capital justification, risk scoring
90-Day Brownfield Rollout: No Shutdown Required
Audit existing equipment list against actual plant floor. Import paper and legacy CMMS records. Identify SCADA data availability per process area. Deploy edge gateway. Begin OPC-UA / OPC-DA subscription configuration on highest-criticality assets.
Outcome: Asset register built, top 40 critical assets connected
Deploy wireless sensors on assets outside SCADA coverage. Capture vibration, temperature, and current baselines during normal operation. Configure alert thresholds against actual baselines — not generic OEM limits. Activate mobile work orders for field technicians.
Outcome: Predictive monitoring live on all Tier 1 assets
Extend coverage to Tier 2 and Tier 3 assets. Configure remaining useful life calculations. Activate capital planning dashboard. Connect spare parts inventory to asset lifecycle records. Launch KPI reporting for plant manager and maintenance manager.
Outcome: Full plant live, capital planning active
No rip-and-replace
Your Legacy Cement Plant Can Run Predictive Maintenance. Without Replacing a Single Process Control.
Oxmaint connects to your existing SCADA, DCS, and historians — or retrofits wireless sensors where coverage doesn't exist. Every critical asset gets monitoring. Every alarm becomes a work order. And your kiln keeps running throughout.
What the Data Shows After 6 Months of Retrofit Operation
The results below are from a 2.8 MTPA brownfield cement plant that completed a full Oxmaint retrofit across legacy kiln, raw mill, cement mill, and packing areas — starting from paper-based maintenance and a 14-year-old disconnected CMMS.
Unplanned Downtime Events
71% reduction in unplanned stops across mill and kiln
Planned vs Reactive Work Order Ratio
From majority reactive to 78% planned maintenance in 6 months
Maintenance Cost per Tonne
31% reduction in total maintenance spend per tonne
Kiln Utilization Rate
19 percentage points of additional kiln availability recovered
Frequently Asked Questions
Our SCADA system is from 2008 and doesn't support OPC-UA. Can you still connect?
We have no digital maintenance history — everything is in paper binders. Can Oxmaint still build baselines?
Yes. Baseline capture happens during the first 2–4 weeks of sensor operation on your actual running equipment. Oxmaint's AI trains on known-good signatures from your specific assets — not generic industry averages. Paper history is valuable for failure mode context, but it's not required for predictive monitoring to function.
How do we handle assets where installing hardwired sensors isn't feasible?
Wireless MQTT sensors (vibration, thermal, acoustic) can be installed on virtually any rotating asset in 30–60 minutes per point with no hardwired infrastructure change. Battery-operated units run 12–24 months between replacements.
Start a free trial to configure your wireless sensor map.
We have equipment from multiple OEMs and multiple generations. Does Oxmaint handle mixed environments?
Oxmaint is designed for mixed brownfield environments. The 4-track retrofit architecture connects OPC-UA, OPC-DA, MQTT, and historian APIs simultaneously within the same plant. Each process area uses the integration path that matches its control infrastructure — no requirement for a single unified protocol across the plant.
Brownfield transformation
Your Older Cement Plant Has More Predictive Potential Than You Think. Unlock It.
Oxmaint connects to legacy kilns, mills, and coolers through whatever control infrastructure they already have — no replacement, no shutdown, no 18-month IT project. Predictive maintenance on your brownfield plant starts in 90 days.
