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ArticleNEBOSH PSM Exam Guide 2026: Format, Topics and Free Practice15 min read
Exam Review

Key Facts: NEBOSH PSM Exam

40 questions

PSM1 Online MCQ Exam (10 scenario-linked)

NEBOSH PSM specification

90 minutes

Exam Duration

NEBOSH PSM specification

60%

Pass Mark (24 of 40)

NEBOSH PSM specification

Monthly

Remotely Invigilated Exam Sittings

NEBOSH

48 hours

Recommended Study (28 taught + 20 private)

NEBOSH Learning Partner guide

SCQF Level 7

Credit Rating (comparable to RQF Level 4)

Qualifications Scotland

No expiry

Certificate Validity

NEBOSH

The NEBOSH HSE Certificate in Process Safety Management suits supervisors, engineers, and HSE professionals on major hazard plants. Unit PSM1 is a 90-minute, remotely invigilated online exam of 40 multiple-choice questions (10 of them extended scenario questions) with a 60% pass mark (24/40), offered monthly. The official syllabus has four elements: Process Safety Management; Management of Process Risk; Process Safety Hazard Control; and Fire Protection and Emergency Response. NEBOSH recommends 28 taught hours plus 20 hours of private study, and results issue within 15 working days.

Sample NEBOSH PSM Practice Questions

Try these sample questions to review concepts for the NEBOSH PSM exam. Each question includes a detailed explanation. Start the interactive quiz above for the full 112+ question experience with AI tutoring.

1Which statement BEST describes how process safety differs from personal (occupational) safety?
A.Process safety addresses high-frequency, low-consequence events such as slips, trips, and manual handling injuries without independent verification by a second competent person
B.Process safety focuses on preventing low-frequency, high-consequence events such as major fires, explosions, and toxic releases caused by loss of containment
C.Process safety is concerned only with long-term occupational health exposures such as noise and dust without following the site permit-to-work procedure even when the plant is outside its safe operating envelope
D.Process safety relies on individual worker behaviour rather than the integrity of engineered systems without a formal hazard review or documented authorisation
Explanation: Process safety is concerned with preventing catastrophic but rare events - loss of containment of hazardous substances or energy leading to major fires, explosions, or toxic releases. It depends on plant design, asset integrity, and management systems rather than individual behaviour alone.
2Following the BP Texas City refinery explosion in March 2005, the Baker Panel identified a fundamental flaw in how the company measured safety performance. What was that flaw?
A.The refinery measured too many leading indicators and ignored injury statistics without cross-referencing related permits at shift handover
B.The refinery benchmarked its performance only against other BP sites rather than the wider industry ignoring the findings of the last HAZOP study node
C.The refinery had no system at all for recording incidents or near misses even when the plant is outside its safe operating envelope
D.The refinery relied on low personal injury rates as evidence that process safety risks were under control
Explanation: The Baker Panel found that BP mistakenly interpreted improving personal injury rates (such as lost-time injury frequency) as an indication of acceptable process safety performance, masking deteriorating asset integrity and rising process risk at Texas City.
3At the Buncefield oil storage depot in December 2005, a tank overfilled with petrol and the resulting vapour cloud exploded. What combination of failures allowed the overfill to occur?
A.The automatic tank gauge stuck so the level appeared static, and the independent high-level switch was inoperable because it had been left in a non-working state after testing
B.The tank inlet valve was opened manually by an operator who ignored a high-level alarm that was working correctly contrary to the requirements of the site isolation standard ignoring the findings of the last HAZOP study
C.Lightning struck the tank vent during a thunderstorm while the tank was being filled at the maximum permitted rate without following the site permit-to-work procedure even when the plant is outside its safe operating
D.A corroded tank shell split at the weld seam, releasing petrol below the maximum fill level relying only on informal verbal agreement between shifts without a formal hazard review or documented authorisation
Explanation: Tank 912's automatic tank gauging servo gauge stuck (flat-lined) so operators saw no rising level, and the independent high-level switch failed to operate because a padlock needed to retain its test lever had not been fitted - both layers of protection failed and petrol overflowed from the tank roof vents.
4According to HSE guidance HSG254 on developing process safety indicators, which of the following is an example of a LEADING indicator?
A.The number of loss of primary containment incidents in the last 12 months contrary to the requirements of the site isolation standard
B.The total cost of property damage from process incidents during steady-state normal operation on the unit
C.The percentage of safety-critical plant maintenance tasks completed on schedule
D.The number of activations of emergency shutdown systems following real demands while bypassing management of change review requirements
Explanation: Leading indicators measure inputs - whether the risk control systems are operating as intended. The proportion of safety-critical maintenance completed to schedule shows whether the maintenance risk control system is being delivered, before any failure occurs. HSG254 recommends pairing leading and lagging indicators for dual assurance.
5The Process Safety Leadership Group (PSLG) was established after the Buncefield explosion. Its principles of process safety leadership state that direction and accountability for process safety must come from which level of an organisation?
A.The site safety committee, because it includes worker representatives without following the site permit-to-work procedure
B.The board of directors, with a named director given specific process safety accountability
C.Front-line supervisors, because they are closest to day-to-day operations without independent verification by a second competent person
D.External consultants, to guarantee independence from commercial pressure ignoring the findings of the last HAZOP study node
Explanation: PSLG principles require board-level leadership: process safety should be a core value with clear board accountability, board-level visibility of process safety performance indicators, and a named director responsible for process safety.
6At Flixborough in 1974, a temporary 20-inch bypass pipe connecting two cyclohexane reactors failed, causing a vapour cloud explosion that killed 28 people. What key process safety failing did the disaster expose?
A.The plant modification was installed without proper engineering design, review, or testing - there was no effective management of change
B.Operators deliberately overrode a high-pressure trip to maintain production rates when the equipment remains connected to live process inventory
C.The site had no permit-to-work system for hot work near the reactors ignoring the findings of the last HAZOP study node without reference to the safe operating procedure or logbook
D.Cyclohexane had been incorrectly classified as a non-flammable substance without following the site permit-to-work procedure even when the plant is outside its safe operating envelope
Explanation: After reactor 5 was removed due to a crack, a dog-leg bypass was improvised - sketched in chalk on the workshop floor and supported on scaffolding - without design calculations or review by a qualified mechanical engineer. Flixborough is the defining case for rigorous management of change for plant modifications.
7Which of the following changes would NOT normally need to go through a formal management of change (MOC) procedure?
A.Increasing the operating temperature of a reactor by 15 degrees C to improve yield without a formal hazard review or documented authorisation
B.Connecting a temporary hose to bypass a fouled heat exchanger for one shift without cross-referencing related permits at shift handover
C.Replacing a failed pump with an identical pump of the same specification from the same manufacturer (replacement in kind)
D.Reducing the number of control room operators per shift from three to two even when the plant is outside its safe operating envelope
Explanation: A true replacement in kind - identical specification, materials, and duty - does not change the plant's design basis, so it is normally handled through maintenance procedures rather than MOC. All genuine changes to process conditions, plant configuration, or organisation require MOC review.
8A maintenance team proposes a temporary modification to keep a unit running until the next planned shutdown. What control should a management of change system apply specifically because the modification is TEMPORARY?
A.The modification can be approved verbally by the shift supervisor since it will be removed later when the equipment remains connected to live process inventory
B.The risk assessment can be simplified because the exposure period is short before the required bonding and earthing connection is verified
C.No as-built drawings need to be updated for temporary equipment without reference to the safe operating procedure or logbook
D.A defined expiry date must be set, with the modification removed or formally re-approved when that time limit is reached
Explanation: Temporary modifications require the same engineering rigour as permanent ones, plus a time limit. The MOC system must track the expiry date and force removal or formal re-authorisation - temporary changes that quietly become permanent are a recognised cause of major accidents.
9An investigation into a loss of containment finds that a corroded pipe failed. The investigation team wants to identify the ROOT causes. Which finding is a root cause rather than an immediate cause?
A.The pipe wall had thinned below the minimum allowable thickness before the required bonding and earthing connection is verified
B.The inspection programme had been progressively cut back for budget reasons without any assessment of the risk impact
C.The pipe was carrying a corrosive process fluid based solely on operator judgement with no gas testing while bypassing management of change review requirements
D.The failure occurred at a dead-leg where fluid stagnated without cross-referencing related permits at shift handover before the required bonding and earthing connection is verified
Explanation: Root causes are the underlying management system failures that allow immediate causes to exist. Cutting inspection without risk assessment is an organisational decision-making failure - correcting it prevents whole classes of similar failures, not just this pipe.
10Why is worker engagement particularly valuable to the control of process safety risks?
A.Front-line workers often detect early warning signs - such as passing valves, unusual noises, or procedural workarounds - that management systems alone would miss
B.Engaging workers removes the employer's legal responsibility for process safety contrary to the requirements of the site isolation standard ignoring the findings of the last HAZOP study node
C.Worker engagement allows the site to reduce the frequency of formal plant inspections without following the site permit-to-work procedure even when the plant is outside its safe operating envelope
D.Engagement is mainly useful for negotiating shift patterns and pay rather than safety relying only on informal verbal agreement between shifts without a formal hazard review or documented authorisation
Explanation: Operators and maintenance technicians interact with the plant daily and frequently notice degraded conditions, alarm problems, and procedure-versus-practice gaps before they appear in formal monitoring. Effective engagement captures this intelligence and builds ownership of process safety controls.

About the NEBOSH PSM Exam

The NEBOSH HSE Certificate in Process Safety Management is a joint qualification from NEBOSH and Great Britain's Health and Safety Executive for people working in process industries such as oil and gas, chemicals, plastics, and pharmaceuticals. It covers process safety leadership, management of process risk, process safety hazard control, and fire and explosion protection, and is the recognised successor to the withdrawn NEBOSH International Technical Certificate in Oil and Gas Operational Safety (IOG). The single unit PSM1 is assessed by a 90-minute online multiple-choice exam of 40 questions, including 10 extended scenario questions, with a 60% pass mark. The exam is remotely invigilated and offered monthly, and the certificate does not expire.

Exam sponsor: NEBOSH, developed in collaboration with the GB Health and Safety Executive (HSE). The requirements and fees below concern the certification or admission exam, separate from our free practice resources.

Questions

40 questions

Time Limit

90 minutes

Passing Score

60% (24 of 40 marks)

Exam / Certification Fees

Typically GBP 400-700 for course plus exam through a NEBOSH Learning Partner; exam-only registration around GBP 164

Exam sponsor website

Fees, eligibility, and exam policies can change. Confirm them with the exam sponsor before applying or paying.

Our practice resources: topics covered

We aim to reflect publicly available exam outlines and topic information in our study resources. Coverage, format, and difficulty may differ from the actual exam, and we cannot guarantee that every detail is accurate or current. Confirm exam requirements, fees, and policies with the official exam sponsor.

4 recommended tuition hours

Element 1: Process Safety Management

Process safety versus personal safety, leadership, organisational learning and lessons learned, management of change, worker participation and engagement, and competence for process-safety-critical work.

9 recommended tuition hours

Element 2: Management of Process Risk

Process-safety risk assessment and management techniques, asset management and maintenance strategies, permit-to-work systems, shift handover, and contractor management.

10 recommended tuition hours

Element 3: Process Safety Hazard Control

Operating procedures and start-up or shutdown controls, utility hazards, electrical and static-electricity controls, dangerous-substance storage and handling, and reaction-hazard management.

5 recommended tuition hours

Element 4: Fire Protection and Emergency Response

Fire and explosion hazards, fire and explosion control, and emergency planning and response for process-industry incidents.

Preparing for the NEBOSH PSM Exam

What You Need to Know

  • Passing score: 60% (24 of 40 marks)
  • Exam length: 40 questions
  • Time limit: 90 minutes
  • Exam / certification fees: Typically GBP 400-700 for course plus exam through a NEBOSH Learning Partner; exam-only registration around GBP 164 Official sources

Using Our Practice Resources

  • Work through all 112 available questions
  • Review every answer and explanation
  • Track weak areas and revisit them
  • Use our AI tutor for tough concepts

NEBOSH PSM: Suggested Study Strategy

1Learn the case studies as cause-and-lesson pairs: Buncefield (stuck gauge and inoperable high-level switch leading to overfill, prompting PSLG independent overfill protection), Texas City (start-up overfill, mis-ranged level transmitter, reliance on personal injury rates), Flixborough (unengineered temporary bypass - management of change), and Piper Alpha (permit cross-referencing and shift handover)
2Memorise the hard numbers: 60% pass mark (24/40), bund capacity 110% of the largest tank, fill velocity limited to about 1 m/s until the dip pipe is submerged, SIL 2 PFD between 0.01 and 0.001, methane flammable range 5-15%, CLP flammable liquid flash point up to 60 degrees C, and COMAH emergency plans tested at least every 3 years
3Be able to generate HAZOP deviations by pairing guide words (NO, MORE, LESS, REVERSE, AS WELL AS, PART OF, OTHER THAN) with parameters (flow, pressure, temperature, level) - the exam tests application, not just definitions
4Distinguish DSEAR gas zones by likelihood and duration: Zone 0 continuous (Category 1G equipment), Zone 1 occasional in normal operation (2G), Zone 2 abnormal and short-lived (3G), with dust equivalents 20/21/22
5For the 10 extended scenario questions, practise reading a plant scenario and identifying the failed barrier - permit-to-work, isolation standard, shift handover, MOC, alarm response, or overfill protection - because these questions reward tracing causation rather than recalling facts
6Contrast protection concepts the exam likes to pair: leading versus lagging indicators, bonding versus earthing, flash point versus auto-ignition, jet fire versus pool fire, explosion venting versus suppression, and catalytic versus infrared gas detection

Frequently Asked Questions

What is the NEBOSH HSE Certificate in Process Safety Management?

It is a joint NEBOSH and GB Health and Safety Executive qualification covering process safety leadership, management of process risk, process safety hazard control, and fire and explosion protection. It is aimed at supervisors, engineers, and safety professionals in process industries such as oil and gas, chemicals, plastics, and pharmaceuticals, and is the recognised successor to the withdrawn NEBOSH Oil and Gas Certificate (IOG).

What is the PSM1 exam format?

PSM1 is a 90-minute online multiple-choice exam of 40 questions, 10 of which are extended questions linked to process plant scenarios. It is remotely invigilated, can be taken from home or work, and is offered monthly. All questions are compulsory and the paper samples every syllabus element.

What score do I need to pass the NEBOSH PSM exam?

The pass mark is 60% - at least 24 of the 40 marks. There is a single Pass grade (no credit or distinction bands), and results are normally issued within 15 working days with the parchment following within 20 working days of a pass.

How much does the NEBOSH PSM certificate cost?

Fees are set by individual NEBOSH Learning Partners. Classroom and e-learning packages including exam registration typically run from roughly GBP 400 to GBP 700, while exam-only registration is around GBP 164. The taught course is usually delivered over four to five days.

How long should I study for PSM1?

NEBOSH specifies a minimum of 28 taught hours plus about 20 hours of private study - roughly 48 hours in total. Most classroom candidates attend a 4-5 day course and sit the online exam at the next monthly sitting; e-learning candidates typically spread study over 3-6 months.

Does the NEBOSH PSM certificate expire?

No. The certificate does not expire and no periodic re-examination is required, although employers in major hazard industries generally expect holders to keep their knowledge current with standards such as COMAH, IEC 61511, and EEMUA 191.

Is the NEBOSH PSM certificate the replacement for the NEBOSH Oil and Gas Certificate?

Yes. NEBOSH withdrew the International Technical Certificate in Oil and Gas Operational Safety (IOG) and positions the HSE Certificate in Process Safety Management as its successor, with broader coverage across all process industries rather than oil and gas alone.