Are you competent?
Are your health and safety specialists actively involved in machine safety?
Do they have the right skills and competences?
Judith Hackitt CBE, HSE Chair
Who am I?
• Certified machine safety expert
• Covered heavy engineering departments
Involved with
• CE Marking and machine risk assessment
• Complex and simple machines
CE Marking Vs PUWER
• CE marking deals with the machine being used for its intended purpose
• PUWER must account for misuse of the machine
• What measures can we apply to all our machines.
• No single way to make every machine safe.
PUWER Primary Objective
“ To ensure that work equipment should
not result in health and safety risks
regardless of its age, condition or
origin”
CE marking• demonstrating compliance with the Essential Health and
Safety Requirements;
• carrying out the appropriate conformity assessment procedure;
• drawing up and issue the Declaration of Conformity or Incorporation; and applying the CE Mark.
• Only harmonised standards can be use to demonstrate compliance with the essential health and safety requirements of the machinery directive.
• Alterations log
Definition of a machine
• An assembly of linked parts or components at least one of which moves, with the appropriate actuator, control and power circuits, joined together for a specific application, in particular for the processing, treatment, moving or packaging of a material. And a control system is one that “responds to input signals from the machine, or from the operator, and generates output signals, which make the machine operate in a desired manner”. So if, for example, an operator presses a start button, the control system may respond by closing a contactor and energising a motor.
• Machinery Directive.
Standards • Type A standards
• (Basic safety standards) giving basic concepts, principles for design, and general aspects
• that can be applied to all machinery;
• Type B standards
• (Generic safety standards) dealing with one safety aspect or one type of safeguard that can
• be used across a wide range of machinery:
• Type C standards
• (Machine safety standards) dealing with detailed safety requirements for a particular
• machine or group of machines.
Functional safety
• ISO 13849
• IEC 62061
• Both standards look at the architecture of the safety system
What is needed to establish PL / CAT
EN ISO 13849-1 parameters Meaning
Cat. Category (B, 1, 2, 3, 4), structural setup as the basis for determining a specific PL
PL Performance level (a, b, c, d, e)
MTTFd Mean time to dangerous failure
B10d
Number of cycles with which 10 % of a random selection of the considered abrasion-prone pneumatic or electro-mechanical components have a failure to danger.
DC Diagnostic coverage
CCF Common cause failure
TM Service life, intended usage time (mission time)
Performance Level
S Seriousness of injury S1 Minor (usually reversible) injury S2 Serious (usually irreversible injury including death) Fr Frequency and/or duration of the exposure to the hazard F1 Seldom to not very frequent and/or exposure to hazard is brief F2 Frequent to continuous and/or exposure to hazard is long P Possibility of preventing the hazard or limiting the harm P1 Possible under certain conditions P2 Not really possible
BS EN ISO 13849-1: 2008, 85 pages
Different stop buttons
• Stop category 0: stopping by immediate removal of power to the machine actuators (uncontrolled stop);
• Stop category 1: a controlled stop with power available to the machine actuators to achieve the stop and then removal of power when the stop is achieved;
• Stop category 2: a controlled stop with power left available to the machine actuators.
However stop category 2 is not usually considered suitable for emergency stops.
Information
• Various SHP online (magazine) articles
• www.machinery-safety-alliance.co.uk
• CE Marking association
• Laidler
• Proctors
• Spierssafety
• www.machinebuilding.net
• www.babt.com
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