The hierarchy of control involves the following steps: Elimination – removes the cause of danger completely. Substitution – controls the hazard by replacing it with a less risky way to achieve the same outcome. Engineering Controls protect workers by removing hazardous conditions or by placing a barrier between the worker and the hazard. Administrative Controls are fairly simple: warning alarms, for example, are just that – alarms that let you know when something isn’t right. The last control is PPE, Personal Protective Equipment, which really is exactly what the name implies: protection you use personally.
Elimination, the top of the hierarchy, is the complete elimination of a hazard, the most effective way to protect workers. For example, bad housekeeping. The best practice would be to eliminate the hazard by picking up or moving what’s in the walking path to prevent a slip, trip or fall. Establish travel paths or walkways through work areas. The concept of elimination isn’t as simple as it sounds. If elimination fixed every hazard, everyone would be doing it. However, if elimination is on the table and is available to an employer, they should use elimination for taking care of the hazard. If elimination doesn’t work, you move on down to the substitution.
Substitution identifies a hazardous situation and uses a different product or piece of equipment that is not hazardous. An example would be, instead of sandblasting, use a non-silica containing abrasive material. The downfalls of substitution are the quality and cost, such as replacing lead-based paint with titanium white. The product must not produce unintended consequences, such as airborne dust, due to inhalation and accumulation of particles in the lungs that can lead to occupational lung disease. Basically, if you can substitute a smaller product with a larger product, that has a larger particle, then that should be your aim.
Engineering controls are designed to get as close to eliminating the hazard as possible, without eliminating it completely. This is done by designing something in the facility or a piece of equipment to reduce the hazard or employee’s exposure to the hazard. The design must be used properly and be certified by ANSI. A glove box for handling hazardous material and chemicals is an example of isolation and engineering control. The box allows the employee to do the work while not being exposed to the material/chemical due to the material being in the box. Engineering controls don’t work out for everyone, they must be used perfectly if used. Engineering controls are the best option when the hazard cannot be eliminated.
Administrative controls (written policies & procedures) are at the point where you identify the hazard and recognize the hazard as one that can be tolerated or lived with as long as there are boundaries and precautions in place, so levels of exposure are not exceeded. Administrative controls can be used in conjunction with engineering controls or PPE such as planning the day job in the evening time in the summer due to heat stress and dehydration of workers.
Finally, PPE. Of all of the controls in the Hierarchy of Controls, Personal Protective Equipment (PPE) is the one most people are familiar with. Why? Well, PPE is quick, easy, often less expensive than other options, and readily available. You should know that PIOSH and OSHA consider PPE a “last resort.” So while a personal fall arrest system is considered PPE, a guardrail is not. While a respirator is considered PPE, ventilation is not. PPE includes material that must be worn on a job site such as earplugs, gloves, hard hats, safety glasses, steel toe boots, or reflective vests. PPE is not a game of guesswork. You must know what PPE is sufficient and insufficient such as earplugs rated for noise reduction. There must be a noise survey done to determine what kind of earplugs will reduce the noise to acceptable levels. PPE must be taken care of and used properly. A full-body harness could save your life, but also could cause serious internal bodily harm if it’s not worn properly.
In a nutshell, take your time and observe the areas around you. If you see a hazard go through the steps of the hierarchy of control to see which level will best suit the hazard to prevent the worker from getting injured. Safety is common sense and we can learn to manage hazards better by using the hierarchy of controls.
