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Machinery Safety Risk Assessments consist of the same basic considerations as any other type of Risk Assessment, and can be carried out by the following step-by-step approach: | Machinery Safety Risk Assessments consist of the same basic considerations as any other type of Risk Assessment, and can be carried out by the following step-by-step approach: | ||
| − | * Identify any hazards associated with the machine | + | *Identify any hazards associated with the machine |
| − | * Estimate the risk | + | *Estimate the risk |
| − | * Evaluate the risk | + | *Evaluate the risk |
There are a wide range of tools and methodologies available to safety professionals to allow them to estimate the level of risk associated with each identified machine hazard, and determine whether or not the current level of risk is as low as reasonably practicable (ALARP). | There are a wide range of tools and methodologies available to safety professionals to allow them to estimate the level of risk associated with each identified machine hazard, and determine whether or not the current level of risk is as low as reasonably practicable (ALARP). | ||
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One methodology which is frequently used in Machinery Safety Risk Assessments is known as the Hazard Rating Number (HRN) method. | One methodology which is frequently used in Machinery Safety Risk Assessments is known as the Hazard Rating Number (HRN) method. | ||
| − | === ''How does the HRN method work?'' === | + | ===''How does the HRN method work?''=== |
Using the HRN system, once a machine hazard is identified, numerical values are assigned based on the following factors which aid in estimating and evaluating the risk related to a particular hazard: | Using the HRN system, once a machine hazard is identified, numerical values are assigned based on the following factors which aid in estimating and evaluating the risk related to a particular hazard: | ||
| − | * Likelihood of Occurrence (LO) | + | *Likelihood of Occurrence (LO) |
| − | * Frequency of Exposure (FE) | + | *Frequency of Exposure (FE) |
| − | * Degree of Possible Harm (DPH) | + | *Degree of Possible Harm (DPH) |
| − | * Number of Persons at risk (NP) | + | *Number of Persons at risk (NP) |
Once the numerical values are assigned to each of the factors above, the hazard rating number (HRN) can be calculated by HRN = LO x FE x DPH x NP. The HRN number can then be equated with an overall risk level, using the tables below. | Once the numerical values are assigned to each of the factors above, the hazard rating number (HRN) can be calculated by HRN = LO x FE x DPH x NP. The HRN number can then be equated with an overall risk level, using the tables below. | ||
{| class="wikitable" | {| class="wikitable" | ||
|+LO - Likelihood of occurrence score | |+LO - Likelihood of occurrence score | ||
| − | |Almost Impossible | + | |Almost Impossible |
|0.033 | |0.033 | ||
|- | |- | ||
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{| class="wikitable" | {| class="wikitable" | ||
|+DPH Degree of Possible Harm Score | |+DPH Degree of Possible Harm Score | ||
| − | |Scratch or Bruise | + | |Scratch or Bruise |
|0.1 | |0.1 | ||
|- | |- | ||
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{| class="wikitable" | {| class="wikitable" | ||
|+FE - Frequency Of Exposure Score | |+FE - Frequency Of Exposure Score | ||
| − | |Annually | + | |Annually |
|0.5 | |0.5 | ||
|- | |- | ||
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|1000+ | |1000+ | ||
|Unacceptable | |Unacceptable | ||
| − | |} | + | |}</translate> |
| − | </translate> | ||
{{PageLang | {{PageLang | ||
| + | |Language=en | ||
|SourceLanguage=none | |SourceLanguage=none | ||
|IsTranslation=0 | |IsTranslation=0 | ||
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{{AddComments}} | {{AddComments}} | ||
Version actuelle datée du 17 juin 2024 à 12:31
Description of the Hazard rating system employed by Stuga Machinery Ltd to classify and compare risk
Description
Machinery Safety Risk Assessments consist of the same basic considerations as any other type of Risk Assessment, and can be carried out by the following step-by-step approach:
- Identify any hazards associated with the machine
- Estimate the risk
- Evaluate the risk
There are a wide range of tools and methodologies available to safety professionals to allow them to estimate the level of risk associated with each identified machine hazard, and determine whether or not the current level of risk is as low as reasonably practicable (ALARP).
One methodology which is frequently used in Machinery Safety Risk Assessments is known as the Hazard Rating Number (HRN) method.
How does the HRN method work?
Using the HRN system, once a machine hazard is identified, numerical values are assigned based on the following factors which aid in estimating and evaluating the risk related to a particular hazard:
- Likelihood of Occurrence (LO)
- Frequency of Exposure (FE)
- Degree of Possible Harm (DPH)
- Number of Persons at risk (NP)
Once the numerical values are assigned to each of the factors above, the hazard rating number (HRN) can be calculated by HRN = LO x FE x DPH x NP. The HRN number can then be equated with an overall risk level, using the tables below.
| Almost Impossible | 0.033 |
| Highly Unlikely | 1 |
| Unlikely | 1.5 |
| Possible | 2 |
| Even Chance | 5 |
| Probable | 8 |
| Likely | 10 |
| Certain | 15 |
| Scratch or Bruise | 0.1 |
| Laceration | 0.5 |
| Break Minor Bone | 2 |
| Break Major Bone | 4 |
| Loss of one limb, eye, hearing | 6 |
| Loss of two limbs or eyes | 10 |
| Fatatlity | 15 |
| Annually | 0.5 |
| Monthly | 1 |
| Weekly | 1.5 |
| Daily | 2.5 |
| Hourly | 4 |
| Constantly |
| 1-2 Persons | 1 |
| 3-7 Persons | 2 |
| 8-15 Persons | 4 |
| 16-50 Persons | 8 |
| 50+ Persons | 12 |
| HRN | Risk Level |
|---|---|
| 0-1 | Negligible |
| 1-5 | Very Low |
| 5-10 | Low |
| 10-50 | Significant |
| 50-100 | High |
| 100-500 | Very High |
| 500-1000 | Extreme |
| 1000+ | Unacceptable |
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