5.1 Hazard and Effects Management Process (HEMP)

5.1 Hazard and Effects Management Process (HEMP)

Hazard and Effects Management Process (HEMP) is a structured method for finding hazards, understanding their effects, judging risk, putting controls in place, and planning recovery if something still goes wrong. In Nigerian HSE training—especially oil and gas, petrochemical, power, and large construction—HEMP is taught as a practical cycle you can apply to almost any task or facility. For the ISPON HSE Level 1 (Basic HSE) Examination, HEMP sits inside the Hazard Identification & Risk Management domain (about 25% of the paper). You must know the steps, the purpose of each step, and how to apply them in simple site scenarios.

Why HEMP Matters in Nigeria

Nigerian industrial work often involves high energy: hydrocarbons under pressure, hot work near flammable atmospheres, deep excavations, heavy lifts, live electrical systems, confined spaces, and busy vehicle interfaces on construction and logistics sites. Informal "be careful" messages are not enough. HEMP gives crews and supervisors a shared language:

• What can hurt us or the environment? (Identify)
• How bad and how likely is it? (Assess)
• What will stop it or reduce it? (Control)
• If it still happens, how do we limit damage and recover? (Recover)

Major operators, EPCs, and many client HSE systems in Port Harcourt, Warri, Lagos, and other industrial centres expect workers to think in this structure—even if the company uses a slightly different brand name for the same logic (hazard identification and risk assessment, bow-tie barriers, or HSE cases). Level 1 candidates should treat IACR as the core memory aid.

The Four HEMP Steps: Identify → Assess → Control → Recover (IACR)

Memorise the order. Exam items often ask which step comes next, or which activity belongs in which step.

Step 1 — Identify

Identify means systematically finding hazards (sources of potential harm) and describing their effects (what could go wrong to people, assets, environment, and reputation). Identification is broader than "spot the obvious danger." It includes:

• Physical hazards (noise, radiation, extremes of temperature)
• Chemical hazards (hydrocarbons, solvents, H₂S, cement dust)
• Biological hazards (waste, stagnant water, infectious agents)
• Ergonomic hazards (awkward lifting, repetitive work)
• Psychosocial hazards (fatigue, excessive overtime, intimidation that blocks stop-work)
• Process and energy hazards (pressure, electricity, stored mechanical energy, vehicles)

Effects are the possible outcomes if the hazard is released or the barrier fails. Examples:

On a flow station near the Niger Delta or a pipeline right-of-way, identification might also capture community and environmental effects (fishing grounds, farmland, drinking water). Level 1 does not require full environmental impact assessment skill, but you must recognise that HEMP effects are not only "broken bones."

Step 2 — Assess

Assess means judging risk—commonly Risk = Likelihood × Severity (covered in depth in the next section). Assessment answers: How serious is this, and how urgently must we control it? Two hazards may both be real, but a high-pressure gas leak path usually ranks higher than a minor trip hazard on a quiet walkway—until assessment shows otherwise.

Assessment uses qualitative tools (risk matrices, expert judgement, historical incident data) more than complex mathematics at Level 1. The goal is prioritisation: put the strongest controls on the highest risks first.

Step 3 — Control

Control means selecting and implementing measures that prevent the hazard from causing harm or reduce risk to an acceptable level. Controls should follow the hierarchy of controls (elimination first, PPE last). Examples of control-stage thinking:

• Isolate energy and prove zero energy before maintenance
• Substitute a less toxic solvent
• Install machine guards and gas detection
• Write and enforce a safe work procedure and permit
• Train workers and supervise high-risk tasks
• Provide and enforce suitable PPE as a final barrier

Controls are sometimes called barriers or defences. Good HEMP practice prefers hard controls (design, engineering, isolation) over reliance on perfect human behaviour alone.

Step 4 — Recover

Recover (sometimes called recovery preparedness or mitigation) assumes that controls can fail. Recovery measures limit how bad the consequences become and help return people and plant to a safe state. Examples:

• Gas detectors and alarms that trigger evacuation
• Emergency shutdown (ESD) systems
• Fire-fighting equipment and trained response teams
• Spill kits, bunds, and drain isolation points
• First-aid arrangements and medical evacuation plans
• Muster points, headcount, and incident reporting
• Temporary repairs and safe restart only after investigation clearance

Recovery is not an excuse to skip prevention. Exam trick: choosing "call the ambulance" as the main answer when the scenario asks for the primary control of an identified hazard is wrong—recovery is the last step after identification, assessment, and control design.

Optional Awareness: Bow-Tie Thinking

Some Nigerian oil and gas training introduces bow-tie diagrams at a simple level. Imagine a bow-tie shape:

• Left side — threats and preventive controls that stop the hazard from reaching a top event (for example, "loss of primary containment")
• Centre — the top event itself
• Right side — recovery/mitigation controls that limit consequences after the top event (fire, toxic cloud, injury)

You do not need to draw professional bow-ties for Level 1. You do need the idea that HEMP covers both stopping events (Control) and limiting harm if they occur (Recover).

Process Summary Table

Nigerian Scenario Walkthrough

Task: Hot work (welding) on a pipe support structure adjacent to a process area at a midstream facility in Rivers State. A temporary scaffold is erected. Nearby drains can receive hydrocarbon residue.

Identify

• Hot work sparks and heat → fire/explosion if flammable atmosphere present
• Working at height on scaffold → falls
• Welding fumes and UV → eye/respiratory harm
• Adjacent process hydrocarbons → release, fire
• Sparks into oily drains → secondary fire pathway
• Other workers and vehicles in the area → struck-by / third-party injury

Assess

• Fire/explosion potential rated high severity; likelihood depends on gas testing and isolation quality → overall high priority
• Fall from scaffold: high severity if no edge protection or harness discipline → high priority
• Welding fume exposure: moderate severity for short duration with controls → medium priority

Control

• Permit to work for hot work; gas test and continuous monitoring as required by site rules
• Isolation/purge of process equipment as applicable; remove or protect combustibles
• Competent scaffold with edge protection; fall protection where required
• Fire watch, extinguishers, spark containment
• Welding screens, PPE (helmet, gloves, eye protection, suitable clothing)
• Barricades and exclusion zones; toolbox talk covering roles

Recover

• Alarm response and evacuation routes known to the crew
• Fire team / extinguisher use if a small fire starts and it is safe to fight
• First aid and medical evacuation plan
• Spill response if oily material ignites or spreads
• Stop work, make safe, report, and investigate before restart

This walkthrough shows HEMP as a full loop, not a single form filled after the job is already finished.

Linking HEMP to Daily Level 1 Behaviours

You support HEMP every day when you:

• Speak up about hazards others have missed (Identify)
• Take high-severity risks seriously and refuse casual ranking (Assess)
• Follow permits, isolations, and hierarchy-minded controls (Control)
• Know muster points, extinguisher locations, and how to raise the alarm (Recover)

Exam Focus

Expect questions on IACR order, matching activities to steps, and scenarios that ask whether an action is identification, assessment, control, or recovery. Remember: recovery limits consequences after failure; control aims to prevent the failure. HEMP is the backbone that risk matrices, hierarchy of controls, and JSA all plug into.