Reliability Engineer
2 min read
Reliability engineering asks how and why products or assets fail, how frequently failure occurs, and how the system can be changed so failure risk decreases.
The career includes two overlapping but distinct contexts:
- product reliability — design life, test, failure mechanisms and field performance;
- maintenance/asset reliability — equipment uptime, failure prevention and maintenance strategy.
Reliability role types
Product reliability
May involve:
- design FMEA;
- reliability testing;
- accelerated life tests;
- failure analysis;
- reliability prediction;
- warranty/field data;
- design changes.
Asset reliability
May involve:
- bad-actor elimination;
- maintenance strategy;
- condition monitoring;
- RCA;
- failure data;
- criticality;
- spare strategy;
- reliability-centered maintenance.
Failure modes
Start with mechanisms, not generic labels.
Examples:
- fatigue;
- wear;
- corrosion;
- overheating;
- contamination;
- misalignment;
- lubrication failure;
- electrical/mechanical interface failure.
The prevention method depends on the mechanism.
Root cause analysis
A good RCA distinguishes:
- immediate cause;
- physical mechanism;
- contributing conditions;
- system/process causes.
Avoid "operator error" as an endpoint.
FMEA
FMEA is useful when it changes design or control decisions.
For product reliability, it may guide design controls and validation.
For asset reliability, it can support maintenance strategy and criticality.
Weibull and reliability data
Reliability engineers may use failure-time data to understand life behavior.
Weibull analysis can help distinguish patterns such as early-life, random or wear-out behavior, but the data and censoring assumptions matter.
Do not fit a distribution simply because software makes it easy.
Condition monitoring
Asset roles may use:
- vibration;
- oil analysis;
- thermography;
- ultrasound;
- motor-current analysis.
The technology is useful only if it detects a failure mode early enough to act.
Reliability testing
Product roles may design:
- cycle tests;
- environmental tests;
- accelerated life tests;
- vibration;
- thermal cycling.
Testing should reflect credible use conditions and known failure physics.
CMRP context
SMRP's current CMRP certification spans five Body of Knowledge pillars: business and management, manufacturing process reliability, equipment reliability, organization and leadership, and work management.
That makes it most relevant to maintenance/reliability careers rather than every mechanical role.
Portfolio
Possible evidence projects:
- bearing failure RCA;
- pump reliability analysis;
- Weibull study using public/simulated data;
- design FMEA;
- accelerated test plan;
- maintenance criticality analysis.
Career path
Reliability engineers can move toward senior reliability, asset management, maintenance leadership, product quality/reliability, condition monitoring or technical leadership.
The strongest reliability engineer combines data with physical failure understanding.
Related content
Sources
- O*NET OnLine — Mechanical Engineers (17-2141.00), updated 2026 — Current occupation tasks, knowledge areas, transferable skills and technology categories.
- SMRP — Certified Maintenance & Reliability Professional (CMRP) — Current CMRP framework and five Body of Knowledge pillars.