A rolling mill pre-start check is the last line of defence between an undetected hydraulic leak and a mid-campaign roll gap excursion, between a missed cooling header blockage and a cobble that shuts the mill for four hours, between a pass-on note that was not read and a drive overload that trips the entire roughing stand sequence. Every shift handover that does not include a structured face-to-face review of current roll condition, hydraulic system status, cooling water performance, and active alarms is a handover that transfers unknown risk to the incoming crew along with the keys. This checklist exists to eliminate that transfer. Sign up for Oxmaint to run this checklist as a live digital template on any mobile device at your mill.
Hydraulic Systems — Roll Gap, Balance, and Looper
Hydraulic system checks are the first pre-start action on every rolling mill. A hydraulic system with low accumulator pre-charge, contaminated oil, or a partially open relief valve will not hold roll gap position under rolling load — producing gauge excursions that are not detected until the coil is rolled. These checks must be completed with the mill stopped and all energy-isolation procedures in place. Sign up for Oxmaint to configure hydraulic pre-start checks with parameter entry fields.
Check with hydraulic power unit running. All readings taken at the HPU instrument panel and at roll gap cylinder position indicators. Allow HPU to run for 5 minutes before taking readings to reach thermal equilibrium.
| Parameter | Normal | Caution | Alarm — Do Not Start |
|---|---|---|---|
| Main circuit pressure | Design ±5% | Design −10% | |
| Cylinder position balance (DS vs OS) | ±0.05mm | 0.05–0.2mm | >0.2mm — servo or cylinder check |
| Oil cleanliness ISO class | 16/14/11 or better | 18/16/13 | Above 18/16/13 — condition oil before campaign |
| N₂ accumulator pre-charge | Per spec ±5% | −10% of spec | <50% of spec — recharge before start |
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Roll Condition — Work Rolls, Backup Rolls & Chocks
Roll condition inspection before start is the check that determines whether the surface quality produced in the coming campaign will meet specification or generate claims. A work roll with an undetected spall, surface crack, or edge chip will transfer the defect to every strip coil rolled until the roll is changed — typically not detected until customer incoming inspection if the surface check before start is omitted. Book a demo to see Oxmaint's roll inspection templates with photo capture.
Inspect all work rolls and backup rolls with adequate lighting. Use the approved roll inspection lamp — LED work lighting is insufficient for detecting incipient surface cracks. All findings logged by roll serial number in Oxmaint digital record for roll campaign tracking.
Cooling Water — Roll Cooling, Scale Breaker & Runout Table
Rolling mill cooling water systems serve multiple simultaneous functions: controlling work roll thermal crown, suppressing scale on strip surfaces, maintaining drive system temperatures, and cooling hydraulic oil. Each function has distinct flow and quality requirements. A single blocked header can produce a localized strip temperature variation that causes a flatness defect in a product that otherwise meets all specification dimensions. Sign up for Oxmaint to set up cooling water flow and temperature alerts.
Start cooling water systems and allow to stabilise for 3 minutes before beginning checks. Verify all circuit flow indicators and check physically along the mill for any visible leaks or misaligned spray equipment before the mill drive sequence begins.
| System | Normal | Caution | Alarm |
|---|---|---|---|
| Main header pressure | Design ±5% | Design −8% | Below design −10% |
| Descaling pressure | ≥180 bar | 160–180 bar | <160 bar — do not roll |
| Cooling water pH | 7.5–9.0 | <7.5 or >9.0 | Below 7.0 — water treatment alarm |
| Conductivity | <500 µS/cm | 500–700 µS/cm | >700 µS/cm — blowdown required |
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Drive Systems — Main Drives, Spindles & Gearboxes
Rolling mill main drive checks confirm that the mechanical transmission between the motor and the work roll is in the condition required to handle rolling loads. A spindle that has run beyond its lubrication interval will begin to bind under heavy gauge rolling loads, creating a torque perturbation that appears in the rolled strip as a periodic thickness variation — a defect that is extremely difficult to diagnose once rolling has begun. Sign up for Oxmaint to schedule spindle lubrication intervals in Oxmaint PM.
Complete all drive checks before energising mill drives. Allow main drive lube system to run for 3 minutes before start to establish pre-lube pressure at all bearings. Jog each stand individually to verify torque ramp-up is smooth before entering rolling sequence.
Safety Systems — Guards, Interlocks & Emergency Stops
Rolling mill safety systems are not optional checklist items — every item in this section is a no-go for mill start if found defective. A mill with a bypassed interlock, a damaged guard, or a non-functional emergency stop has already removed a layer of protection from an environment where uncontrolled strip breaks, roll spalls, and drive failures present acute injury risk. Book a demo to see Oxmaint safety check escalation configured.
Shift Handover Template — What the Outgoing Crew Must Pass On
A shift handover is not a verbal briefing about recent events. It is a structured transfer of current system state, active issues, and pending actions that the incoming shift must understand before taking responsibility for the mill. Every item in this handover template must be covered before the outgoing operator leaves the mill floor. Sign up for Oxmaint to generate the handover report automatically from the shift's digital round data.
Complete this handover record in Oxmaint before the end of shift. The incoming shift supervisor receives a notification with a link to this record before arriving at the mill. Face-to-face handover must supplement — not replace — the digital record.
We had a hydraulic cylinder seal that had been leaking slowly for two shifts before the outgoing crew mentioned it at handover. By then it had contaminated 40 litres of oil and the cylinder had developed a position drift. If that observation had been in a structured digital handover record rather than a verbal aside at shift change, the incoming crew would have had it flagged before they even arrived on the floor — and we would have changed the seal during the next planned stop rather than the unplanned emergency stop it turned into.
Rolling Mill Pre-Start Checklist — Common Questions
A paper pre-start checklist creates a record of what was checked. A digital checklist in Oxmaint creates a timestamped record of what was checked, who checked it, when each item was completed, what readings were recorded, and what flags were raised — with automatic escalation if any item is marked deficient. For safety incident investigations, the digital record provides a legally defensible timeline of pre-start activities. For maintenance management, the parameter readings build a trend database that identifies deteriorating systems before they fail. Sign up for Oxmaint to activate your rolling mill pre-start template today.
Yes — the six-section structure applies to both cold and hot rolling mill configurations. For a cold rolling mill, the CWM section replaces descaling checks with emulsion concentration and filtration checks. The HYD section adds tension reel hydraulic checks. The RLL section focuses on roll surface roughness profile rather than thermal crown for cold rolling applications. The SAF and HOV sections are applicable without significant modification to either mill type. Oxmaint's digital template is fully configurable per mill within the same platform. Book a demo to see cold rolling mill template configuration.
Deficient items in Oxmaint pre-start templates trigger two simultaneous actions: an escalation notification is sent immediately to the shift supervisor and the maintenance manager, and a corrective action work order is automatically generated and assigned to the responsible maintenance crew. The work order is linked to the pre-start checklist item — so the maintenance team sees exactly which check failed and what the recorded parameter value was. The pre-start checklist record shows the item as open until the corrective action work order is closed, providing a visible hold on the shift handover completion status.
Every Rolling Campaign Starts with a Pre-Start Check. Make Yours Count.
A rolling mill pre-start check completed on paper is a record of what was verified. A pre-start check completed in Oxmaint is the beginning of a trend database, an automatic escalation system, and a structured shift handover that transfers real operational intelligence — not just keys — to the incoming crew.
