2018-11-01 12:00 - Messages

Risk assessment in safety of machinery

Impact of construction flaws in risk estimation parameters
In the risk assessment approach as defined in the International Standard ISO 12100: 2010, risk estimation is an essential step that allows machinery designers and users to determine the level of risk, and to identify the most critical hazardous situations. Previous studies demonstrated that the numerous qualitative tools proposed to estimate risks in safety of machinery take several forms, and that many of their features can significantly influence the level of risk obtained.
In this study, the impact of some of these features was assessed, and construction rules regarding the parameters used in risk estimation tools were validated through an experimental study involving several users mainly from the industry. Five potential construction flaws of the risk estimation parameters were analyzed. The experimental results show that when the users perceive a certain challenge in the utilization of a risk estimation parameter, they are usually able to associate it with the presence of the flaw affecting the parameter. The results also demonstrate quite clearly that the impact of the construction flaws in the parameters is not uniform. In addition to the presence of the flaws within these parameters, the results obtained suggest that the assessment of the probability of harm is a problematic aspect of the risk estimation process in safety of machinery that requires further research. These results could contribute to the improvement of the robustness and the reliability of the existing tools, and help to support the training actually given by the partners in the risk assessment field.

Source: Gauthier, F., Chinniah, Y., Burlet-Vienney, D., Aucourt, B. et Larouche, S. (2018). Safety Science, 109, 421-433.

Guidance on Safety in Concrete Pumping

The aim of this guidance is to improve standards of safety during concrete pumping and reduce the incidence of collapse of concrete pump rigs and injuries due to incidents involving pressurisation of pipework or other equipment.

As with all construction equipment, the safe operation of concrete pumps depends on a number of factors including the selection and maintenance of the pump and placing boom, the planning and supervision of their
use and the competence of the operator and other personnel. If any of these are deficient, the risk of a serious accident increases significantly, so it is essential that site managers ensure that all concrete pumping operations are planned, supervised and carried out safely.

Source: https://www.hsa.ie/eng/Publications_and_Forms/Publications/Latest_Publications/guidance_on_safety_in_concrete_pumping.81983.shortcut.html

Presses plieuses hydrauliques pour le travail à froid des métaux

Amélioration de la sécurité sur les machines en service dans le cadre de leur rénovation. Spécifications techniques à l'usage des utilisateurs, des préventeurs et des rénovateurs
Ce guide concerne les presses plieuses hydrauliques à chargement et/ou à déchargement manuel, non marquées "CE".
Il est destiné à guider les utilisateurs et les préventeurs, aidés du rénovateur, dans le diagnostic de sécurité des presses plieuses hydrauliques, et à définir les points sur lesquels la sécurité peut être améliorée, tout en prenant en compte les contraintes de la production.
Il se veut une aide au choix des solutions les mieux adaptées à la sécurité des opérateurs, tout en conservant autant que possible les circuits existants.
Il présente au rénovateur les solutions techniques à mettre en oeuvre pour améliorer la sécurité.

Source: http://www.inrs.fr/media.html?refINRS=ED%20927

Improving farm safety: standards for agricultural machinery just updated

The series of standards ISO 25119, Tractors and machinery for agriculture and forestry – Safety-related parts of control systems, is widely used by the agricultural industry and its suppliers and has recently been updated. It sets out the general principles for the design and development of safety-related parts of control systems on tractors and self-propelled ride-on machines used in agriculture and forestry. It can even be applied to mobile equipment used in municipalities such as street-sweeping machines.
The standards in the series are:
·  ISO 25119-1, Tractors and machinery for agriculture and forestry – Safety-related parts of control systems – Part 1: General principles for design and development
·  ISO 25119-2, Tractors and machinery for agriculture and forestry – Safety-related parts of control systems – Part 2: Concept phase
·  ISO 25119-3, Tractors and machinery for agriculture and forestry – Safety-related parts of control systems – Part 3: Series development, hardware and software
·  ISO 25119-4, Tractors and machinery for agriculture and forestry – Safety-related parts of control systems – Part 4: Production, operation, modification and supporting processes

Source: https://www.iso.org/news/ref2343.html

Fault tree analysis and risk mitigation strategies for mine hoists

Mine hoist are an essential part of an underground mine. In addition to extracting the ore from the mine, this machine transports the miners from the surface to the various underground levels of the mine. The two main hazards to which minors in the cage are exposed to are rope severance and loss of control of the hoisting machine. In both cases, the risk is the crashing of the cage at one end of the shaft. Hoisting accident and fatalities are rare but still happen despite the use of safety catches to retain the cage in the event of rope severance. The objective of this article is to improve mine hoist safety and to prevent the crash of a cage (of more generally any conveyance) at the shaft boundaries. Fault Trees (FT) are used to analyze the accidents scenarios of a cage crash in a shaft. Two generic fault trees are presented: one based on rope severance and the other based on loss-of-control of the conveyance. Results of the study indicate that, in the case of a rope severance, most of the root causes are based on secondary failure of the safety catches. In the case of a loss-of-control of the conveyance, most of the root causes are based on command failures that prevent the cage from stopping before reaching the shaft boundaries. This article suggests general mitigation measures and recommends the use of machinery safety standards in order to improve the reliability of hoisting machines.

Source: Giraud, L. et Galy, B. (2018). Safety science, 110, 222-234.

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