Course Title

1. Introduction to Occupational Noise Hazards

• Noise-Induced Hearing Loss — NIHL — is permanent and irreversible once hair cell damage occurs

• NIHL is the most prevalent occupational disease in manufacturing, construction, and oil and gas environments

• Regulatory framework — OSHA 29 CFR 1910.95: Occupational Noise Exposure and ISO 9612:2009: Acoustics — Determination of Occupational Noise Exposure — Engineering Method

• Action Level — 85 dBA TWA — triggers the mandatory hearing conservation program

• Permissible Exposure Limit — 90 dBA TWA — requires engineering and administrative controls before HPD

• 5 dB exchange rate — permissible exposure time halves for every 5 dBA increase above 90 dBA

• Peak noise limit — 140 dB — applies to impulsive and impact noise sources

• Non-auditory effects of noise including stress, fatigue, communication interference, and accident risk

2. Noise Measurement and Exposure Assessment

• Sound pressure level — SPL — measured in decibels on the A-weighting scale — dBA — for occupational exposure

• Sound level meter types — Type 1 precision and Type 2 general purpose — and correct selection for occupational surveys

• Personal noise dosimeter — worn by the worker to capture actual exposure throughout the shift

• Noise measurement methodology per ISO 9612:2009 — task-based, job-based, and full-shift measurement strategies

• Calibration of sound level meters and dosimeters before and after each measurement session

• TWA calculation — combining noise levels and exposure durations to determine the 8-hour average

• Noise dose calculation — expressing exposure as a percentage of the permissible daily dose

• Area noise survey versus personal dosimetry — when each method is appropriate

• Octave band analysis for engineering control design — identifying dominant frequency ranges

3. Noise Control Hierarchy

• Hierarchy of noise controls per OSHA 29 CFR 1910.95 — engineering and administrative controls precede HPD

• Elimination — removing the noise source entirely from the workplace where feasible

• Substitution — replacing a noisy process or machine with a quieter alternative

• Engineering controls — damping, isolation mounts, acoustic enclosures, barriers, and silencers

• Administrative controls — job rotation, limiting exposure duration, and scheduling noisy work for low-occupancy periods

• Quiet by design — specifying noise emission limits when purchasing new equipment

• Engineering control effectiveness verification — post-installation noise measurement to confirm reduction achieved

• HPD as the control of last resort — not a substitute for feasible engineering controls above the PEL

4. Hearing Protection Devices

• HPD types — earplugs (foam, pre-moulded, and custom), earmuffs, and combined plug-and-muff systems

• Noise Reduction Rating — NRR — the US standard attenuation rating for HPD per ANSI S3.19

• Single Number Rating — SNR — the European attenuation standard per EN ISO 4869

• Applying the derating factor — OSHA requires 50% derating of NRR for real-world attenuation estimation

• Selecting the correct HPD for the noise level — ensuring adequate but not excessive attenuation

• Correct insertion technique for foam earplugs — the most common source of HPD performance failure

• HPD fit testing — verifying individual attenuation using personal attenuation rating — PAR — testing

• HPD inspection and replacement — condition checks before each use and replacement frequency

• Over-protection hazard — excessive attenuation preventing warning signal detection and verbal communication

5. Hearing Conservation Program

• Mandatory hearing conservation program trigger — exposure at or above 85 dBA TWA per OSHA 29 CFR 1910.95(c)

• Program components — monitoring, audiometric testing, HPD provision, training, and recordkeeping

• Baseline audiogram — required within 6 months of first exposure at or above the action level

• Annual audiogram — compares to baseline to detect Standard Threshold Shift — STS

• Standard Threshold Shift — STS — a 10 dB average shift at 2000, 3000, and 4000 Hz in either ear

• Audiometric follow-up — retest, referral, and revised HPD assignment when STS is confirmed

• Annual training obligation — repeated training for all workers at or above the action level

• Noise exposure record retention — minimum 2 years per OSHA 29 CFR 1910.95(m)

• Audiometric record retention — duration of employment per OSHA 29 CFR 1910.95(m)

6. HSE and Quality Management Integration

• Noise as an occupational health risk in the ISO 45001:2018 risk register

• Apply HIRARC to identify and assess noise hazards across all work areas and tasks

• Noise control measures documented in the operational controls register per ISO 45001:2018 Clause 8.1

• Worker participation in noise assessment per ISO 45001:2018 Clause 5.4

• Noise monitoring program documentation per ISO 9001 — calibration records, survey reports, and exposure records

• Nonconformance management for HPD non-compliance and missed audiometric tests per ISO 9001 Clause 10.2

• Apply RCA to NIHL cases — identifying monitoring gaps, control failures, and HPD compliance issues

• Apply PDCA — Plan-Do-Check-Act to drive continual improvement in the hearing conservation program

7. Case Studies and Group Discussions

• Case studies from NIHL incidents in Middle East manufacturing, construction, and petrochemical environments, and the importance of proper noise assessment and control training

• Group discussion on noise management challenges in regional environments including enforcing HPD compliance in hot outdoor environments and managing noise during petrochemical turnarounds

• Practical noise assessment exercise — teams use a sound level meter to measure noise levels in a presented scenario, calculate TWA and dose, compare against action level and PEL, and develop a noise control recommendation and HPD selection plan