Page 25 - Critical Control flipbook_Neat

Coal Mill Explosion

1 What is the name of the 2 What are its specific objectives related to the Priority Unwanted
critical control for Coal Mill
Event (PUE)?
Explosion?
Hazardous Area Management Having the area appropriately classified into corresponding ‘Hazardous Areas’ as per ISO/
IEC 60079-10-2, and hence minimising the ignition sources by having the appropriate
equipment and access control to prevent an explosion

3 What are the critical 4 What are the activities 5 What can be sampled from
control performance
the set of activities for
within the management
requirements to meet the systems that support verification, providing a
objectives? having the critical control clear image of the critical
able to do what is required? control status?

Hazardous Area Classification (HAC) All hazardous area drawings are available Review the HAC and ensure that it is
drawings with appropriate equipment in the system with version control and current and signed off by a competent
selection (e.g ATEX certified, IECEx current authority
certified or NEC/CEC)

Regular inspection and maintenance of Scheduled inspection and maintenance Percentage of inspection or Preventive
all equipment within the hazardous area in Computerised Maintenance Maintenance (PM) completion rate
that could potentially lead to explosion Management System (CMMS) as per Number of defects found during
(Detailed, Close, and Visual Inspection) manufacturer’s requirements/ Corporate inspection and PMs. (This should be
CEM guidance documented in CMMS)
Classified as highest priority and critical
equipment in CMMS

No Hot work allowed within Hazardous Only trained and competent HWP issuers Number of competent HWP issuers for
area unless the area has been on hazardous areas are allowed to issue hazardous area
declassified, and Hot Work Permit (HWP) HWP Review the declassification process
issued A specific procedure to declassify during an actual HWP process to
hazardous area for hot work activities measure its effectiveness
Number of fire incidents reported in
hazardous areas

Coloured or tagged as “Hazardous Area” System to identify, colour or tag as Number of non compliances
in the field. (Ex) “Hazardous Area”. (This should be visual as
well as identifiable in CMMS)

Access restricted, with appropriate Access control to hazardous areas, only Number of areas without access control
signage competent and authorised personnel can and signage
enter a hazardous area with appropriate
PPE and tools (anti-static, spark proof)

6 What is the target performance for critical 7 What is the critical control performance
trigger for shutdown, critical control review or
control?
investigation?
All the inspection, maintenance and testings are carried out as 15% Failed Certified Equipment during Inspection
per ISO/IEC 60079 Standard Unauthorised deferment of maintenance without Plant
No Hot Work unless area has been declassified Manager’s written authorisation

Creation date: 01/2021 • The latest and only controlled version of this document is available on the HSE intranet.
© 2021 Holcim - For internal use only