PDC on Hazard and Risk Assessment By Maharshi Mehta, ISS - PowerPoint PPT Presentation

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PDC on Hazard and Risk Assessment By Maharshi Mehta, ISS


PDC on Hazard and Risk Assessment Occucon 2014, Goa February 11, 2014 – PowerPoint PPT presentation

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Title: PDC on Hazard and Risk Assessment By Maharshi Mehta, ISS

Hazard and Risk Assessment
  • PDC on Hazard and Risk Assessment
  • Occucon 2014, Goa
  • February 11, 2014
  • Maharshi Mehta, CSP, CIH
  • International Safety Systems, Inc.,
    Washingtonville New York, USA
  • www.issehs.com

  • Introduction to Industrial Hygiene
  • Hazards
  • Chemical Physical and Biologcal Agents
  • Hazards and Risk
  • Exposure Limits
  • Risk Assessment Tools
  • Case Studies
  • Demonstration of Risk Assessment tools

Industrial Hygiene
Hazard Anticipation-Hazards likely to be present?
Hazard Recognition-What are health hazards?
Risk Evaluation-Exposed to health hazard? How
Risk Control-How can exposure be reduced?
So that.. Health risk is minimized
And potential for occupational illnesses,
material loss are reduced and the company
liability minimized
The Need
  • Prevent occupational illness and injury by
    reducing/eliminating health risk
  • Significant cost savings by reducing/recovering
    particulate/vapor emissions
  • Regulatory requirements
  • Productivity increase
  • In the Europe, 150 million workdays are lost each
    year due to work accidents and illnesses and the
    insurance costs 20 billion Euros
  • Annual cost of occupational illnesses and
    injuries in Latin America is about 75 billion

Exposure Limits
  • Airborne concentration of a substance
  • Repeated exposure to the substance below exposure
    limit day after day is unlikely to produce
    adverse health effects in healthy workers
  • High Health Hazard Chemicals have low exposure
  • Examples of exposure limits at Huntsman
  • Hydrochloric acid 5 ppm ceiling limit
  • Ammonia 25 ppm long term limit for 8 hours

Exposure limits are not a fine line between safe
and dangerous concentrations
Organizations Establishing Occupational Exposure
Limits (OELs)
  • American Conference of Governmental Industrial
    Hygienists (ACGIH), USA
  • Local Regulatory Agencies
  • Occupational Safety and Health Administration
    (OSHA), USA
  • Health and Safety Executive (HSE), UK
  • Technical Rules for Hazardous Substances (TRGS),
  • GE Established OELs
  • More stringent

Units of Exposure Limits
Expressed as concentration of the airborne
substance in a volume of air
  • Vapor/gaseous airborne substances
  • ppm (parts per million)- the parts of airborne
    substance per million parts of air
  • ppb (parts per billion)- the parts of airborne
    substance per billion parts of air
  • Particulate airborne substances
  • mg/m3 - milligrams of airborne substance per
    cubic meter of air
  • µg/m3 - micrograms of airborne substance
    per cubic meter of air

1 m
1 m
1 m
1 mg
Airborne fibers Fibers/cc -fibers per cubic
centimeter of air
Concentration of airborne substance is 1 mg/m3
What are Hazards and Risks
  • Hazard Chemical, Physical and or Biological
    agent that can cause harm 
  • Risk - The likelihood that the potential for harm
    will be caused by hazards
  • Hazardous substances are present most of the time
  • Risk is dependant on (a) human exposure to
    hazards and (b) degree of exposures
  • Degree of exposure is dependant on controls
    provided and work practices followed

Industrial Hygiene Risk Assessment (IHRA) is
process of determining degree of health RISK
based on degree of HAZARDS and extent of EXPOSURE
The Need
  • Assist in determining
  • the need for exposure controls
  • respiratory protection and types of respirators
  • if an illness is work related or not
  • Assist in protecting company in occupational
    illness litigations
  • Targeted medical surveillance
  • Medical surveillance focused on potentially
    exposed individuals

Methodology - Planning
  • Obtain and review process information, chemical
    lists before hand
  • Obtain and review past mentoring data and
    historical assessment
  • Review floor plan and mark areas CRA to ensure
    all areas are covered
  • Review applicable regulation and standards
  • Obtain list of chemicals and ingredients

Where and When Should Chemical Risk Assesment be
  • Where
  • Include all operations and activities
  • Include all non-routine operations and activities
    such as, maintenance
  • Include activities with no apparent health risk
  • E.g., Warehouse potential risk from noise and
    carbon monoxide (CO) from forklift may be present
  • When
  • Before any new process begins
  • When change in process occurs

Required for Employees, Contract Employees,
Temporary Workers
Chemical Risk Assessment
  • Degree of hazards
  • Hydrochloric acid and ammonia
  • Frequency and duration of handling/exposure
  • How long tanker unloading is done
  • The risk of the material becoming airborne
  • of HCl and does it become airborne
  • Historical air monitoring results (if available)
  • Existing engineering controls and work practices
  • How do we collect QC sample
  • Effectiveness of exposure control is determined
    or not
  • Chemical properties volatility, particle size,
  • Fly ash , coal dust
  • Ingestion
  • Skin contact

Site Visit
  • Determine frequency/duration of
    operation/personal exposures
  • Determine approximate quantities of materials
  • Observe controls - make subjective assessment of
  • Interview workers and/or supervisors at each
    stage of process
  • Gather data on raw materials, finished products,
  • Collect relevant MSDSs
  • Note specific PPE used
  • Start to complete Risk Ranking

Rank Frequency Duration Frequency Duration Frequency Duration Frequency Duration Health Hazard Health Hazard Airborne Potential Engineering Control Skin Exposure Skin Exposure
  Daily Weekly monthly Yearly Chemicals API Airborne Potential   Skin Hazard Exposure Potential
1 Minimal (under 30 minutes) Any / Minimal (under 5 hours) Any / Minimal (under 20 hours) Any / Minimal (under 250 hours) OEL in range 3.1 to 10 mg/m3 or gt 1000 ppm OHC 1, OEL gt1000 µg/m3 Low Total enclosure validated by IH monitoring No skin hazard, temporary effects  
2 About 30 min to lt 2 hour 5 to 15 hours per week 20 to 60 hours per month 250 to 500 hours per year OEL in range 0.51 to 3 mg/m3 or 101 to 1000 ppm OHC 2, OEL 100 µg/m3 - 1000 µg/m3 Medium Total enclosure NOT validated    
3 About ½ Shift (2 to 4 hours) 15 to 25 hours per week 60 to 80 hours per month Use More Frequent Basis OEL in range 0.01 to 0.5 mg/m3 or 10 to 100 ppm OHC 2, OEL 100 µg/m3 - 1000 µg/m3 High      
4 About ¾ Shift (4 to 7 hours) 25 to 30 hours per week Use More Frequent Basis Use More Frequent Basis OEL lt 0.01 mg/m3 or lt 10 ppm OH Cat 3, OEL 10 µg/m3 - 100 µg/m3   Moderate (LEV) validated Probable skin irritants, materials may cause dermatitis. Short term skin exposure
5 (over 7 hours) Use More Frequent Basis Use More Frequent Basis Use More Frequent Basis   OH Cat 4, OEL 1 µg/m3 - 10 µg/m3        
6           Cat 4, OEL 0.01 µg/m3 - 1 µg/m3   Moderate not Validated    
7           OH Cat 4, OEL lt 0.01 µg/m3     Will cause skin irritation, sensitizers, corrosives (acids, caustics, nickel). Repeated-long Skin exposure
8               Non-fixed controls movable LEV    
10               No controls Materials toxic to skin (ACGIH) Skin Skin exposure certain
Final Risk Ranking Criteria Final Risk Ranking Criteria Final Risk Ranking Criteria
  Description Final Risk Ranking
lt50 Acceptable process is well controlled and personal exposures are obviously unlikely to become significant no further action required other than periodic review  1
50-200 Potentially acceptable but it may be possible to further reduce exposures by adopting simple recommendations 2
200-400 Further evaluation needed the qualitative assessment has not provided enough information to be confident that personal exposures are acceptable air monitoring may be required. 3
gt 400 Very High Risk -Implement exposure controls immediately 4
Case Study-HCl unloading
  • 37 HCl, how hazardous the chemical is?
  • Ceiling Limit of 2 ppm
  • Unloading is done from tanker
  • Closed piping
  • Unloading is done for 2 hours/week
  • Is it harmful through skin?
  • Skin Contact likely?
  • What is final risk

  • Frequency Duration Ranking?
  • Hazard Ranking?
  • Is it becoming easily airborne? Ranking?
  • Are exposure controls provided? Effective?
  • Inhalation ranking multiplication of 1x2x3x4
  • Now what is inhalation ranking?

Skin Ranking
  • Is HCl very harmful to skin? What is ranking?
  • Is skin contact likely? What is ranking?
  • Skin Exposure ranking is 1x2
  • What is skin exposure risk?
  • Total Risk is Inhalation Ranking Skin Ranking
  • What is Total Ranking?
  • Is risk acceptable? What needs to be done

Observations and Recommendations
  • Very important as observation based degree of
    risk is more important than number based risk
  • Provides bases for ranking used
  • Obtain and enter as much of the pertinent
    information as possible based on observations and
  • While making recommendations, consider
  • Quick Fix
  • Feasibility
  • Cost effectiveness
  • Mention PPEs used, if any

Quantitative Exposure Assessment
  • Chemical exposure monitoring
  • Direct reading instruments
  • Detector tubes (Colorimetric tubes)
  • Passive monitoring with Diffusion badges/tubes
  • Active monitoring with sampling pumps
  • Noise monitoring
  • Area noise monitoring
  • Personal noise exposure monitoring (Dosimetry)
  • Heat stress monitoring
  • Ionizing radiation monitoring
  • Vibration monitoring
  • Bio-aerosol monitoring

Active Air Monitoring
Sampling media
Sampling media
Sampling pump
Active Air Monitoring
  • Process
  • Air is drawn through a sampling media, kept in
    the breathing zone of the person potentially
    exposed, with a battery operated sampling pump
  • The sampling media is analyzed and weight of
    contaminant determined
  • The weight is divided by the volume of air drawn
    through the media to determine contaminant
  • Substance-specific accurate identification of
  • Corporate and regulatory requirements
  • Acceptable in litigation
  • Determines exposure during actual work. Not an
    instantaneous concentration determination as in
    direct reading instrument

Quality Assurance in Exposure Monitoring
  • Health of working people depends on exposure
    monitoring results
  • Ensure sampling duration is closed to the
    exposure duration.
  • Do not miss beginning and ending of shifts as
    high exposure may occur during this time (e.g.,
    cleaning of work area)
  • Exposure monitoring may have to begin at 6 am if
    shift starts at 6 am.
  • Ensure calibration of sampling device before and
    after sampling
  • Ensure sampling device is calibrated annually
  • Ensure sampling time is exact. Ensure sampling
    time does not end with 0 and 5 (e.g., 805 am,
    810 am)

Demonstration of Risk Assessment Tool and
  • Control Of Substances hazardous to Health (COSHH)
    Risk Assessment Tool
  • Industrial Hygiene Risk Assessment Tool at one of
    the largest corporations
  • Process
  • Computerized model
  • Data Synthesis and analysis for 2000 sites

COSHH Assessment Tool-Part 1
COSHH Assessment Part 2
COSHH Assessment Part 3
COSHH Assessment Part 4
Enhanced IH Module
Assessment w/Risk Assessment integrated into IH
Enhanced IH Module (Cont.)
Streamlined Add New Assessment form
Risk Assessment Details section
Enhanced IH Module (Cont.)
Risk Assessment Details Pending for an Existing
Assessment Record
Risk Assessment Details Completed
Enhanced IH Module (Cont.)
Streamlined Risk Assessment Details Form with
Guidance Mouseovers
Enhanced IH Module (Cont)
Risk Assessment Workflow Option to Submit to
Enhanced IH Module (Cont.)
Risk Assessment Review Option Special Right
HSE (UK) COSHH Essentials
  • Control banding tool for small to medium size
    enterprises to do risk assessments for chemicals
    mixtures of chemicals
  • Required information
  • Type of task shoveling, drilling
  • Hazard classification (using risk safety
    phrases from MSDS )
  • Volatility or dustiness (from guidance material)
  • Amount used- kg,mg,litres,milliliters

HSE (UK) COSHH Essentials (cont)
  • System identifies
  • Control band (control approach)
  • Produces advice on controlling risk from the
    chemical being used in the task
  • Provides written guidance documentation

ILO Chemical Control Tool kit
  • Very similar to COSHH Essentials
  • Does not apply to process dusts or fumes due to
    the fact that these are not classified by the
    supplier of individual chemicals
  • Has general application to many situations in
    developing countries but susceptible groups
    (child workers pregnant women) need to be

Stages of the ILO Chemical Control Toolkit
Stage 1 Hazard Classification
Stage 1 Hazard Classification (cont)
Stage 2 How Much is Used
Stage 3 - Dustiness
Stage 3 Volatility
Source ILO toolkit
Stage 4 Control Approach
Source ILO toolkit
Stage 5 Task Specific Control Guidance Sheet
Source ILO toolkit
Stage 5 Task Specific Control Guidance Sheet
Source ILO toolkit
Stage 5 Task Specific Control Guidance Sheet
Source ILO toolkit
Lessons Learned
  • Understanding Hazard is prerequisite to risk
  • Risk Assessment is essential to determine degree
    exposure controls
  • Comprehensive Risk Assessment reduces over all
    cost of exposure monitoring and provides
    opportunity to implement exposure controls before
  • Above all Adds few days, months or years in to
    life of working people.
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