Safety Norms: Industrial Maintenance and Reliability Engineering

1Purpose, Scope, and Safety Principles

These norms guide people who plan, perform, supervise, and assess maintenance on industrial equipment and processes, and reliability engineers who use failure data to change maintenance strategies. They cover mechanical, electrical, instrumentation, hydraulic, pneumatic, and process systems in settings such as manufacturing lines, utilities, water treatment, and chemical or food processing plants.

• Principle one: people come before production. No schedule, backlog target, or restart pressure overrides a verified isolation.
• Principle two: hazards are identified before work starts, not discovered during it.
• Mandatory means the site must enforce the rule without exception. Recommended means good practice the site may adapt after documented review.
• Where local law, site standards, or manufacturer instructions are stricter, they take precedence over this document.

2Roles, Competence, and Accountability

Authorization is task-specific. Completing a general plant induction does not authorize anyone to open a pressurized line, enter a tank, or work on an energized panel. Authorization records must be checked at the permit stage, before work begins, not after it is finished.

• Site leadership provides resources, approves the safety management system, and ensures schedules do not require bypassing controls.
• The maintenance supervisor issues work orders, confirms permit requirements, and stops any job that lacks a verified isolation.
• The competent person for each task verifies energy isolation, atmospheric test results, and fall protection before work starts.
• Reliability engineers must not change protective devices, alarm setpoints, or safety-rated functions without management of change and a qualified safety review.
• Contractors must show documented competence for their task and complete a site induction before starting.
• Any worker may stop work when conditions are unsafe, and no one may be penalized for doing so in good faith.

3Course-Specific Hazards and Risk Assessment

Typical activities include breakdown repairs, planned overhauls, bearing and seal changes, belt and coupling work, valve and pump replacement, compressor and boiler servicing, motor testing, vibration and thermography surveys, oil sampling, and physical inspection of failed components during root cause analysis. Each activity brings specific hazards and requires a documented task risk assessment.

• Stored energy from electrical, hydraulic, pneumatic, spring, gravitational, and thermal sources: high risk.
• Unexpected machine movement during testing, jogging, or bump starts: high risk.
• Entanglement at rotating shafts, couplings, belts, chains, and conveyors: high risk.
• Release of pressurized steam, hot oil, or process fluids causing burns or injection injuries: high risk.
• Arc flash and electric shock during testing or work near energized equipment: high risk.
• Falls from platforms, ladders, and structures: high where fall distance exceeds site limits.
• Oxygen deficiency and toxic atmospheres in tanks, sumps, pits, and vessels: high risk.
• Solvents, lubricants, cleaning agents, and sampling reagents: medium to high, depending on safety data sheet information.
• Noise, vibration, and heat exposure: medium risk, managed by measured exposure against site limits.
• Releases of oils, coolants, refrigerants, and wastewater: medium to high, with potential off-site impact.
• Falling objects, traffic, and public access near work areas: medium risk.

4Preventive Controls and Safe Work Practices

Energy isolation is the central control. The site lockout tagout procedure must identify every energy source, its isolation point, the lock and tag used, and the verification method. Isolation must be confirmed by the person doing the work at the point of isolation. Verbal assurance from a control room operator is not sufficient on its own.

• Lock and tag every isolation point with a personal lock and tag per worker. Do not use shared keys or leave locks without a named owner.
• Verify zero energy with a test instrument or controlled trial start, then return controls to the off position and record the result.
• Bleed pressure, drain stored fluids, and confirm zero pressure before breaking any joint, flange, or fitting.
• Test each conductor for absence of voltage with a rated tester before touching, following the site electrical procedure. Only qualified electrical workers may perform live-equipment tasks.
• Do not bypass interlocks, guards, or trips for testing unless a written temporary bypass has been approved, compensating measures are in place, and the bypass is removed when the task ends.
• Replace and verify all guards before restart. Guards removed for maintenance must be logged and checked by a second person where the site procedure requires it.
• Hot work requires a hot work permit, removal or protection of combustibles, gas testing where flammables are present, and a trained fire watch that remains after the task.
• Confined space entry requires a permit, atmospheric testing before entry, continuous monitoring, a trained attendant outside, and a rescue plan. Untrained rescue attempts endanger additional people and must not occur.
• Work at height requires fall protection rated for the task, inspected harnesses and lanyards, anchor points confirmed by the site standard, and inspected ladders or platforms.
• Lifts above the site threshold require a lift plan, inspected rigging, and a certified operator. No load may pass over people.
• Thermography and vibration surveys should use approach distances that maintain required clearances from energized parts. Do not open electrical enclosures for surveys unless authorized.
• Oil and fluid sampling should use sampling points designed for the service, drip containment, and approved procedures. Never sample hot or pressurized lines outside the written method.
• Failed parts retained for investigation must be tagged, bagged or contained, and stored in a controlled location so evidence and hazards are both managed.

5Equipment, Environment, Information, and Protective Safeguards

PPE is selected from the task risk assessment, not from habit. The baseline for maintenance areas is safety glasses or goggles, safety footwear, hearing protection where measured noise exceeds site limits, and gloves suited to the task. Gloves must not be worn near rotating equipment where they can be drawn into machinery. Arc-rated clothing, respirators, and fall protection must match the documented hazard, and respirator use requires fit testing and medical clearance under local rules.

• Inspect tools, lifting equipment, and test instruments before each use. Remove damaged items from service and tag them.
• Use calibrated test instruments with current calibration records. Torque, pressure, and temperature limits come from manufacturer instructions and site standards.
• Place drip trays, absorbent materials, and secondary containment under fluid connections before opening them. Keep spill kits at designated points.
• Label waste oil, solvents, and contaminated rags, and store them in approved containers. Do not discharge fluids to drains, soil, or stormwater.
• Refrigerant and other regulated substance handling must be done only by personnel holding any certification required by local law, which must be verified with the competent authority.
• Restrict access to PLC, SCADA, and control system programs to authorized users. Program changes require change control and independent verification.
• Do not share passwords. Use approved remote access channels only, and log all remote sessions.
• Maintenance laptops that connect to operational technology networks must be scanned and approved before connection and must not be connected to corporate and control networks at the same time.
• Inspection photos, wearable sensor data, and worker location data may contain personal information. Collect only what is needed and handle it according to applicable privacy rules.

6Incident Reporting, Emergency Response, and Escalation

Every injury, exposure, release, property damage event, and near miss must be reported to the supervisor and recorded in the site system, normally within the same shift. Reporting is mandatory. Near misses are treated as warnings of system weakness and are investigated with the same care as injuries. Investigations focus on system causes such as isolation gaps, unclear permits, and schedule pressure rather than blaming individuals.

• Stop work immediately on any unsafe condition, make the area safe, and keep people clear of the hazard.
• Call the site emergency number and emergency services for any serious injury, fire, gas exposure, or uncontrolled release. Do not enter an unsafe area to rescue someone unless trained and equipped to do so.
• For electrical contact, do not touch the person until the source is isolated by a trained person, then call emergency services.
• For fire, activate the alarm, evacuate, and use extinguishers only if trained and the exit route is clear.
• For hazardous releases, isolate the source only if it is safe, contain the spill, and notify environmental and public authorities as required by permit or law.
• Escalate to management immediately when an isolation fails, permit conditions change, emergency equipment is unavailable, or near misses repeat.
• Only trained first aiders may provide first aid. Eyewash, first aid kits, and emergency showers must be marked, unobstructed, and inspected at the frequency set by the site.

7Records, Training, Inspection, and Review

Records are part of the safety control. Permits, isolation records, atmospheric test results, lifting plans, calibration logs, inspection results, training records, and incident reports must be complete, legible, and retained for the period required by local rules. Training must be documented, practical, and verified through competency assessment, not attendance alone. Emergency drills should test isolation, rescue, spill response, and communication with sufficient realism to reveal gaps.

• Monitor leading indicators such as permit audits, isolation checks, and completed toolbox talks.
• Monitor lagging indicators such as injuries, near misses, and environmental releases, with trends reviewed by management.
• Update task risk assessments when assets, contractors, procedures, or reliability findings change.
• Feed reliability analysis into safety reviews. Recurring failures that create hazards must trigger changes to inspection intervals, guarding, or procedures.
• Review this document and local procedures at a frequency set by the site and after any serious incident or significant change.

8Conclusion and Use of This Document

These norms are a starting point, not a substitute for locally approved procedures, professional engineering judgment, formal training, or supervision. Sites should adapt them to their assets, processes, jurisdiction, and manufacturer instructions, and should have qualified safety and engineering professionals review high-risk activities such as electrical work, confined spaces, hazardous materials, and lifting operations. Where guidance conflicts with a legal requirement, the legal requirement governs.

Implementation checklist

• Confirm the work order, permit, and task risk assessment are current before starting any job.
• Identify every energy source and apply a personal lock and tag at each isolation point.
• Verify zero energy with a test instrument or controlled trial start, and record the result.
• Confirm guards and interlocks are in place before restart, and confirm any bypass is approved in writing.
• Select and inspect PPE and fall protection against the task risk assessment before use.
• Test the atmosphere before entering any confined space, and keep a trained attendant outside.
• Stop work and report any injury, near miss, leak, or unsafe condition within the same shift.
• Use spill containment, label waste, and prevent discharge to drains, soil, or stormwater.
• Limit operational technology access to authorized users and route all program changes through change control.
• Feed failure data and near-miss findings back into risk assessments and maintenance procedures.