Design Out Risk Before Work Begins: Build Safer Choices Into the System

Move the safety decision upstream

The US National Institute for Occupational Safety and Health defines Prevention through Design as anticipating and designing out hazards in facilities, processes, equipment, tools, work methods, new technologies and the organisation of work. Its purpose is practical: reduce occupational injuries, illnesses and fatalities by addressing risk where choices are still open.

This shifts an important question. Instead of asking only, “How will the worker cope with this hazard?”, ask, “Why must the exposure exist in the finished arrangement?” A valve that can be operated from a permanent safe position, a component that can be lifted with an engineered point, or a material selected to avoid a harmful exposure may remove repeated dependence on perfect behaviour.

Prevention through design does not mean every risk can be eliminated, and it does not remove the need for competent engineering or operational controls. It means the team tests elimination, substitution and engineered separation early—when a drawing, specification or sequence can still change without requiring a costly retrofit.

Use the hierarchy as a design challenge

OSHA’s hierarchy of controls ranks elimination and substitution above engineering controls, administrative controls and personal protective equipment. OSHA also advises employers to use interim controls while longer-term solutions are developed. The hierarchy is not a promise that the first option is always feasible; it is a disciplined way to avoid stopping at the easiest visible measure.

When a review produces only signs, training and PPE, ask what higher-order options were considered and why they were not selected. Record the decision basis, constraints and residual risk. A strong review may still require several control layers, but it should not silently convert an avoidable design problem into a permanent frontline burden.

Keep the comparison specific. “Install a guard” is not yet a complete decision. The team needs to understand the task, foreseeable access, inspection needs, failure modes, maintainability and applicable standards. Design authority remains with the competent people appointed by the organisation; a toolbox discussion should reveal operating knowledge, not approve an unverified modification.

Review the whole life of the asset

NIOSH states that Prevention through Design is most effective in early planning and design. The useful review horizon extends beyond normal operation. Consider construction, commissioning, cleaning, sampling, fault-finding, routine maintenance, inspection, decontamination, modification and eventual removal.

A design can look efficient in steady operation while creating awkward access every week. A filter may be easy to install but difficult to isolate and drain. A lifting point may suit the original component but not its expected replacement path. A display may be readable from the control position yet hidden when the operator must verify local equipment status.

Bring the people who will operate, clean, maintain and inspect the system into the review at the appropriate stage. Their experience helps identify foreseeable interactions that a drawing alone may not reveal. This participation supports the design authority; it does not transfer technical accountability to the workforce.

A hypothetical example: redesigning a routine sample point

Hypothetical teaching scenario—not a reported incident: A project proposes a weekly liquid-sampling point beside a hot line and below a crowded pipe rack. The initial work method relies on heat-resistant gloves, a face shield, a portable step and a detailed sequence. Each measure may have a role, but together they signal that the layout deserves another design question.

During the review, an operator describes the hand position, a maintenance technician explains access needed for valve replacement, and the process engineer checks containment, drainage and sample integrity requirements. The team evaluates whether the sample location, access arrangement or sampling method can be changed so routine collection occurs from a stable position with less proximity to hot surfaces and a controlled destination for residual liquid.

The final solution would require the organisation’s normal engineering assessment, authorisation and verification. This example does not prescribe a sampler or piping arrangement. Its lesson is the timing of the decision: recurring exposure should be challenged before the layout becomes fixed and the procedure becomes the only remaining defence.

Frontline actions that improve the design

• Describe the real task, including access, body position, visibility, tools, cleaning and recovery after interruption.
• Identify where the plan depends on repeated manual handling, temporary access, close approach or memory.
• Distinguish a design concern from an immediate defect, and use the correct reporting and escalation route for each.
• Do not improvise a physical change. Protect the existing approved condition until an authorised modification is assessed and completed.

Specific observations are more useful than a general statement that a design is difficult. Explain who is exposed, during which activity, how often, under what conditions and what safer outcome the review should achieve.

Leadership actions that prevent future exposure

Select one upcoming project, purchase or modification and ask for evidence that worker safety was considered before the design was frozen. Review how the team examined elimination, substitution, engineered controls, maintainability and credible non-routine work. Confirm that unresolved risks have owners and decision dates.

Give design reviews enough time to change the design. Late consultation can document concerns without leaving a realistic opportunity to resolve them. Protect a clear path for operations and maintenance personnel to contribute, and close the loop by showing what changed, what did not change and why.

Track recurring temporary controls and difficult tasks as possible design-improvement signals. A recurring scaffold, repeated line break, frequent manual lift or persistent need for extra PPE may justify a structured review. Do not assume that repetition proves acceptability; determine whether a safer engineered arrangement is reasonably achievable and authorised.

Connect this lesson with frontline involvement, management of change and maintenance readiness. Those lessons help teams hear operational knowledge, control change and preserve asset function. Prevention through design uses that knowledge before exposure becomes embedded in the system.

Team discussion

Which recurring task on our site depends most heavily on access equipment, PPE, manual effort or a perfect sequence—and what design question should be examined before the next project or modification?