Friday, 11 December 2015

SAFETY PERFORMENCE

SAFETY PERFORMENCE

  SAFETY PERFORMANCE INDICATORS


1. FREQUENCY RATE

2. FATAL ACCIDENT FREQUENCY RATE

3. PERCENTAGE REDUCTION IN FREQUENCY RATE(PRFR)

4. WEIGHTED FREQUENCY RATE

5. SAFE T-SCORE

 6. INCIDENCE RATE

7. SEVERITY RATE

8. MEAN DURATION RATE

9. DURATION RATE

10. DISABLING INJURY INDEX 

 

FREQUENCY RATE

A question 'How often do injuries occur?' is replied by the frequency rate which is defined as the disabling (lost time) injuries per 106 man-hours worked.
 F1   =    No. of lost time injury x 106
                   Manhours worked
 FR   =    No. of lost time injury x 106
                   Manhours worked
 If the injury does not cause loss of time in the period in which it occurs but in a subsequent period the injury should be included in the frequency rate of the period in which the loss of time begins.
 If an injury causes intermittent loss of time, it should only be included in the frequency rate once that is, when the first loss of time occurs.
 Since frequency rate F, is based on the lost time injuries reportable to the statutory authorities, it ma) be used for official purposes only. In all other cases frequency rate F, should be used for comparison purposes.
 In some country, the frequency coefficient (F) h determined by
 F   =    No. of injuries for a given period x 1000
                   Total Man – hours of exposure

FATAL ACCIDENT FREQUENCY RATE

 It indicates fatalities per 108 man-hours worked. It is the number of deaths from industrial injuries expected in a group of IOQO people during their working lives (1000 x 40 years x 52 weeks x 48 hours = 1000  x 40  x50x  50  =  108) 
FAFR of chemical Industry
FAFR in UK Of
France                          -           8.5
West Germany -           5
UK                              -           4
USA                            -           5
Chemical Ind.               -           4
Steel Ind.                      -           8
Coal Mining                  -           40
Air Crew                      -           250
FAFR for non-industrial activities
Staying at home                        -           3
Travelling by bus                       -           3
Travelling by car                       -           57
Traveling by air             -           240
Motor cycling                           -           660
Rock climbing                           -           4000


PERCENTAGE REDUCTION IN FREQUENCY RATE(PRFR) 

 PRFR   =    Frequency rate now x 100

                   Frequency rate past
 This is used to decide awards. Average PRFR for two consecutive years is considered.

WEIGHTED FREQUENCY RATE 

  While giving National Safety Award, this rate : considered and given bv -

 WFR   =    (No. of fatal accidents x 10) x 106
                        Total man – hours worked
 +    (No. of permanent total dis – abilities x 10) x 106
                               Total man – hours worked
 +    (No. of Nonfatal  Accidents) x 106
                        Total man – hours worked
 Here each fatal accident and permanent total disability are equated with 10 non-fatal accidents.


SAFE T-SCORE

It is given by
 SafeT-Score  =
 Frequency rate now – Frequency rate past
           Frequency rate past x 106
            Manhours worked now.
 Positive (+) STS indicates a worsening record while negative (-) STS indicates an improving record over the past.
   If STS is                                                        It indicates
 Between +2 & -2                     Change is not significant. There may be random fluctuation only.
More than +2                           Record is worsening than it was in the past. Something wrong has happened.
Less than – 2                            Record is improving than it was in the past. Something better has happened.
 Thus Safe-T-Score is useful to compare our safety record with the past and to control it if it is found worsening.

INCIDENCE RATE 

 General incidence rate is the ratio of the number of injuries to the number of employees during the period under review. It is expressed as the number of accidents or injuries, per 1000 persons employed.

 IL         =    No. of lost –time accidents or injuries x 1000
                        Average No. of persons employed
 IR         =    No. of reportable lost time accidents or injuries x 1000
                              Average No. of persons employed

SEVERITY RATE

A question 'How serious are the injuries? is replied by the severity rate which is defined as the number of days of lost time per 106 man-hours worked.
 SL        =    Mandays lost due to lost time injury x 106
                                   Manhours worked.
 SR        =    Mandays lost due to reportable lost time injury x 106
                                   Manhours worked.
 The severity coefficient (S) is determined by
 S          =    Mandays lost in all accidents for a given period
                              No. of injuries for a given period
  Since severity rate SR is based on the lost time injuries reportable to the statutory authorities, it should be used for official purposes only. In all other cases severity rate SL should be used for comparison purposes.

MEAN DURATION RATE 

  It is an average number of days lost per accident

 MDR   =    Total number of mandays lost
                     Total number of accidents
             =    Severity Rate
                  Frequency Rate
       It is also called average days charged or average severity per injury and given by:
 Average days charged =    Severity Rate
                                                   Frequency Rate
Mandays lost per accident =       Total days lost or charged
 Total no. of disabling injuries
 

MEAN DURATION RATE 

  It is an average number of days lost per accident

 MDR   =    Total number of mandays lost
                     Total number of accidents
             =    Severity Rate
                  Frequency Rate
       It is also called average days charged or average severity per injury and given by:
 Average days charged =    Severity Rate
                                                   Frequency Rate
Mandays lost per accident =       Total days lost or charged
 Total no. of disabling injuries


DISABLING INJURY INDEX 

 

DII       =    Frequency Rate x Severity Rate
                                      1000
 Disabling Index is also given as :
 DII =  Frequency Rate + 10% of Severity Rate.
 This index can be used to compare plant to plant.

FREQUENCY SEVERITY INDEX 

 

FSI   =   Frequency rate x Severity rate
                                1000
 This is the square root of Disabling Injury Index. It gives combined effect of frequency and severity rate. This index can be used to compare-plant to plant. This can be used to indicate degree of improvement.

MOTOR VEHICLE ACCIDENT RATE 

 

MVAR =    Number of accidents x 106

                 Miles of operating exposure

MOTOR VEHICLE ACCIDENT RATE 

 

MVAR =    Number of accidents x 106

                 Miles of operating exposure


COST SEVERITY RATE 

 

Cost Severity Rate        =    Total cost of accidents  x 106
                                           Total Production Man-hours

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