Page 31 - 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?
Explosion Vents and Fire Fighting Having appropriately designed explosion vents as per ISO/EN 14491, and fire fighting
systems
Prevent any catastrophic explosion due to confinement and secondary explosion. Limit
the extent of the damage and further propagation

3 What are the critical 4 What are the activities 5 What can be sampled from
control performance
within the management
the set of activities for
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?
Certified explosion protection devices All explosion protection devices to have Review documentation for any
rated for the Pmax, Kst, and Pred values vendor certificate and Operations & discrepancies, and whether the device is
of coal in use Maintenance (O&M) manuals fit for purpose
Pmax - Maximum Pressure Deviations from O&M manuals to be
Kst - Pressure Rise during explosion managed as Management of Change
Pred - Reduced pressure due to (MoC)
explosion venting

Regular inspection and maintenance of all Scheduled inspection and maintenance Percentage of inspection or Preventive
explosion protection devices. Free of any in Computerized Maintenance Maintenance (PM) completion rate
build-up Management System (CMMS) as per Number of defects found during
manufacturer’s requirements/ Corporate inspection and PMs. (This should be
CIP guidance documented in CMMS)
Classified as highest priority and critical
equipment in CMMS

Regular inspection, testing and Scheduled inspection, testing Percentage of inspection or PM
maintenance of fire fighting system and maintenance in CMMS as per completion rate
(Reels, hydrant, hose, fixed cannons) international codes such as NFPA Number of deferred inspection,
Annual performance testing (Flow & test or PMs
Pressure) Number of defects found during
inspection and PMs. (This should be
documented in CMMS)
Coloured or tagged as “Critical Control” A systematic approach across the plant No. of non compliance to the defined
in the field to identify, colour or tag as “critical” - This systematic approach
Explosion vent zones need to be should be visual as well as identifiable in
barricaded and access restricted CMMS

6 What is the target performance for critical 7 What is the critical control performance
trigger for shutdown, critical control review or
control?
investigation?
Both explosion protection and fire fighting system to be Failed/inadequate Certified Equipment during Inspection
adequately sized and designed according to standards. All the Unauthorised deferment without Plant Manager’s written
inspection, maintenance and testings are carried out as per ISO/ authorisation
EN 14491 Standard and NFPA

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