Overview
Pump and motor alignment may expose the crew to unexpected shaft movement, pinch points and mechanical stored energy even when a drive appears stopped. A qualified maintenance team must verify all relevant electrical and process isolations before removing coupling guards. OEM-defined measurement tolerances, safe shaft handling, tool accountability and guard reinstatement are mandatory prior to operational test run. This guidance does not provide alignment tolerances or authorize energized adjustment.
Main Hazards
- • Wrong asset or undefined process boundary
- • Unexpected motor start or shaft movement
- • Exposed coupling, pinch points and slippery surfaces
- • Trapping, incorrect adjustment or instrument failure
- • Loose bolts, missing guard or foreign material
- • Vibration, abnormal noise or exposure to rotating parts
Required PPE
- ✓Task-suitable helmet, eye protection, gloves and footwear; supplementary laser and lubricant protection as assessed.
- ✓Task-specific PPE must be selected against the risk assessment and must never replace isolation or engineering safeguards.
Essential Controls
- 1Verify asset tag, work order, connected process and work boundary with operations.
- 2Complete authorized LOTO, process isolation and verification of a safe state.
- 3Remove required guards under authorization; secure the work area and housekeeping.
- 4Follow OEM limits and approved safe measurement method; control any necessary shaft rotation.
- 5Inspect connections, remove tools and reinstate all required guards.
- 6Test only under operations authorization; stop for abnormal readings and record acceptance.
- 7Record the exact equipment tag, isolation owners and alignment instrument calibration.
- 8Require a separate test-run handback with personnel cleared from rotating parts.
Common Mistakes
- ×Relying solely on a stopped motor instead of authorized lockout and zero-energy verification.
- ×Allowing hands near coupling pinch points during manual rotation.
- ×Performing a test run before all guards and foreign-object checks are complete.
Pre-start and handback verification
- ✓Work order, asset identity and LOTO verified
- ✓OEM measurement method and acceptance criteria available
- ✓Guard reinstatement and test authorization planned
- ✓Stop-work criteria and emergency communication were reviewed with affected crews.
- ✓The approved work permit, authorized procedure and competency requirements are verified.
Stop-work and emergency response
Stop if safe isolation is not verified, unexpected shaft movement occurs, guarding is incomplete or abnormal vibration is detected. Apply the site emergency plan, make the work area safe and restart only after competent authorization.
Technical References
OSHA links lead to official US regulations. Always confirm local legal requirements, scope of applicability, and site-specific procedures. Other listed sources remain informational references until their official links are verified.
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