technical seminar safety rules for different zones in industrial automation manoranjan sahoo ei...
TRANSCRIPT
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Safety Rules For Different Zones in Industrial Automation
Manoranjan Sahoo EI 200117259
Safety Rules For Different Zones in Industrial Automation
Presented by Manoranjan Sahoo EI200117259
Under the guidance of Mr. Bhawani Shankar Pattnaik
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Safety Rules For Different Zones in Industrial Automation
Manoranjan Sahoo EI 200117259
Safety is a situation, whereby the risk is not greater than the limit risk.
Risk is a combination of the probability and the degree of the possible injury or damage to health in a hazardous situation.
Safety is relative.
There is no such thing as 100% safety.
INTRODUCTION
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Safety Rules For Different Zones in Industrial Automation
Manoranjan Sahoo EI 200117259
Danger: The risk is greater than the limit risk.Safety: The risk is not greater than the limit risk.Limit risk: The maximum acceptable level of risk.Residual risk: Risk remaining after safety measures has taken.
The Margin Between Danger and Safety
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Safety Rules For Different Zones in Industrial Automation
Manoranjan Sahoo EI 200117259
Why Safety?
Prevention of accidents
Protection in the workplace.
Cost effective.
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Safety Rules For Different Zones in Industrial Automation
Manoranjan Sahoo EI 200117259
DIFFERENT SAFETY STANDARDS
ANSI:- American National Standards Institute. IEC:- International Electrotechnical Commission. DIN:- Deutsches Institute of NormungOSHA:- Occupational Safety and Health Administration EU:- European economic Union (EN-standards)
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Safety Rules For Different Zones in Industrial Automation
Manoranjan Sahoo EI 200117259
SAFETY ZONES
Safety Integrity
Level
Probability of failure on demand
1 >=10^-5 to <10^-4
2 >=10^-4 to <10^-3
3 >=10^-3 to <10^-2
4 >=10^-2 to <10^-1
Relation between SIL and PFD
Relation between SIL and SC
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Safety Rules For Different Zones in Industrial Automation
Manoranjan Sahoo EI 200117259
SAFETY RULES
Flow chart for the iterative process to achieve safety
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Safety Rules For Different Zones in Industrial Automation
Manoranjan Sahoo EI 200117259
Determination of the Limits of Machinery All phases of machinery life The limits of machinery including the intended use The full range of foreseeable uses of the machinery The anticipated level of training, experience, and ability of the user Exposure of other persons to the hazards of the machinery Hazard Identification Risk Estimation
Risk analysis:
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Safety Rules For Different Zones in Industrial Automation
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Risk Evaluation and Reduction
Safe machinery design
Protection measures for the risks that can’t be eliminated
Inform users of the residual risks
Information, instruction, training and supervision
Use of Personal Protection Equipment
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Safety Rules For Different Zones in Industrial Automation
Manoranjan Sahoo EI 200117259
Area Guarding
Switch off power when a person enters the hazard area Prevent switching on power when a person is in the hazard area.
Trip and presence sensing device Trip and Area guarding
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Safety Rules For Different Zones in Industrial Automation
Manoranjan Sahoo EI 200117259
Choice of Protective Measures
1. Preventing access during dangerous motion Fixed Guards Movable Guards Two-Hand Controls 2. Preventing dangerous motion during access. Photoelectric Light Curtains Pressure Sensitive Safety Mats Pressure Sensitive Edges
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Manoranjan Sahoo EI 200117259
Fixed guard Movable guard
Two Hand control
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Safety Rules For Different Zones in Industrial Automation
Manoranjan Sahoo EI 200117259
Pressure Sensitive Edge
Pressure Sensitive Safety Mat Photoelectric Light Curtain
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Safety Rules For Different Zones in Industrial Automation
Manoranjan Sahoo EI 200117259
Emergency Stops
Cable Pull Switches Telescopic Trip Switches
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Safety Rules For Different Zones in Industrial Automation
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Safety Light Curtains
Safety light curtains fall into three product families
1. Point of Operation Control 2. Area Access Control
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Safety Light Curtains
3. Perimeter Access Control
Function Advantages Greater productivity Ergonomically sound Frequent and easy access
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Safety Rules For Different Zones in Industrial Automation
Manoranjan Sahoo EI 200117259
Blanking- Fixed and Floating
Fixed Blanking Floating blanking
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Safety Rules For Different Zones in Industrial Automation
Manoranjan Sahoo EI 200117259
Muting
The muting conditions defined in IEC 61508:a. Muting is only permitted to be activated during the time span of the working cycleb. Muting must be performed automatically. c. Muting must not depend on a single electrical signal.d. Muting must not depend completely on software signals.e. The muting signals, if they occur as part of an invalid combination, must not permit any muting state. f. The muting state is removed immediately after the pallet has passed through
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Safety Rules For Different Zones in Industrial Automation
Manoranjan Sahoo EI 200117259
Muting
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How to choose the device 3 characteristics of a device:
Resolution The height of the protected area The safety distance
Resolution visualization
R = I + d R = ResolutionI = Inter-axis distanced = Diameter
Resolution for body Protection
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The height of the protected area
HCA = HSA+2I WhereHCA = Height of the controlled areaHSA = Height of the sensitive areaI = Inter Axis distance
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The safety distance
OSHA Formula: Ds = 63 X TS where Ds= Safety Distance 63 = Recommended hand speed in in/sec
TS = Total stop time in Sec ANSI Formula: Ds = K x (Ts + Tc + Tr + Tbm) + Dpf Ds = The minimum safe distance K = 63 (hand speed in in/sec) Ts = Stopping time of machine, in seconds Tc = Control circuit response time in seconds Tr = Light curtain response time Tbm = Response time of a brake monitor Dpf = Depth penetration factor EN 1050 Formula:
S = (K x T) + C K = 1600mm/sec assumed operator speed T = The overall stopping time of the system C = Depth of penetration S = Safety distance
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CONCLUSION
High efficiency is required High accuracy is required Complexity increases Terrorism increases Safety is required
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Safety Rules For Different Zones in Industrial Automation
Manoranjan Sahoo EI 200117259