Page 51 - Critical Control flipbook_Neat

Material Engulfment

1 What is the name of the 2 What are its specific objectives related to the Priority Unwanted
critical control for Material
Event (PUE)?
Engulfment?
Only Work Above Material Level If material storage/transfer space must be entered as absolute last resort, then entrants
remain above material level

3 What are the critical 4 What are the activities 5 What can be sampled from
within the management
control performance
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?
Material level and location are known Technology or approved method used to Inspection record review for past entries
prior to entry confirm material level / location before Project Plan (for silo cleaning)
entering the space and recorded in
formal pre-entry inspection
Part of Project Plan (for silo cleaning)

Cleaning work/access is done from the Risk assessment, SOP and permit-to-work Review of risk assessment, SOP and
top down. If standing on material is for the top-down entry created permit to work being available and used
required, cavities eliminated and a flat/ Part of Project Plan (for silo cleaning) Project Plan (for silo cleaning)
covered surface prepared

Equipment used is certified and suitable Defined requirements for the equipment Review of record of certification and
for entrants to work from top down being used and accessibility to this equipment specifications
without risk of falling or engulfment equipment (work access, fall protection Project Plan (for silo cleaning)
systems, etc.)
Part of Project Plan (for silo cleaning)

Entrants to the material storage/transfer Authorization process for entering into Review process and authorized samples
space are trained and certified and material storage/transfer spaces defined from work completed
work is authorized by permit-to-work in and procedure created Project Plan (for silo cleaning)
advance Part of Project Plan (for silo cleaning)

6 What is the target performance for critical 7 What is the critical control performance
trigger for shutdown, critical control review or
control?
investigation?
Entry only completed with entrant above level of material Entry into space with entrant below material level or not
(if material present) authorized entry
For silo cleaning, Project Plan is authorized and signed off by Lack of formal Project Plan for silo cleaning activity
Plant Manager’s N+1

Creation date: 01/2021 • The latest and only controlled version of this document is available on the HSE intranet.
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