Hydrocarbon Processing - October 2021 - GP-14

MAINTENANCE AND RELIABILITY
ently safer design include utilizing advanced technologies, proper
equipment design margins, equipment spare/redundancy,
multiple trains, enforcement in equipment support structures
and associated piping, upgraded materials of construction, etc.
The success also depends on the planning and scheduling of
all related engineering activities focusing on the prevention of
unplanned shutdowns, including value engineering, alarm/trip
setpoints rationalization, functional safety, risk analysis of equipment
failure mode, etc. For the development of a new LNG facility,
it is always a good practice to start the program early, such as
in the engineering design phase. It will be beneficial to make the
owner's maintenance strategy known to all parties involved (engineering
contractors, licensors, equipment manufacturers, etc.)
to help prevent unplanned shutdowns, and to put relevant design
requirements in the basis of design. The owner's engineers
typically play an important role in ensuring that all of these procedures
align with the owner's maintenance philosophy.
During plant operation, proper maintenance of all major
equipment systems is of paramount importance to minimize the
potential of unplanned shutdowns due to component wear or
equipment failure. While details and techniques for implementing
an advanced maintenance program may depend on the specific
maintenance method chosen, in general, several steps may follow:
1. Identify target equipment or systems, including
those that have emergency shutdown interlocks
in design, based on potential risk level of failure.
2. Evaluate the current conditions of target equipment or
systems based on plant monitoring data and inspection
in reference to historical reliability data.
3. Set maintenance priorities accordingly. If a shutdown
for maintenance and inspection is unavoidable, then the
scheduled shutdown interval may be re-evaluated based
on the potential risk level of major asset equipment to
minimize the potential risk of failure, maintenance/
repair cost, and cost due to loss of production.
Sometimes, unplanned shutdowns can occur due to human
error. While numerous factors can contribute to human error,
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Hydrocarbon Processing - October 2021

Table of Contents for the Digital Edition of Hydrocarbon Processing - October 2021

Contents
Hydrocarbon Processing - October 2021 - Cover1
Hydrocarbon Processing - October 2021 - Cover2
Hydrocarbon Processing - October 2021 - Contents
Hydrocarbon Processing - October 2021 - 4
Hydrocarbon Processing - October 2021 - 5
Hydrocarbon Processing - October 2021 - 6
Hydrocarbon Processing - October 2021 - 7
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Hydrocarbon Processing - October 2021 - Cover3
Hydrocarbon Processing - October 2021 - Cover4
Hydrocarbon Processing - October 2021 - GP-1
Hydrocarbon Processing - October 2021 - GP-2
Hydrocarbon Processing - October 2021 - GP-3
Hydrocarbon Processing - October 2021 - GP-4
Hydrocarbon Processing - October 2021 - GP-5
Hydrocarbon Processing - October 2021 - GP-6
Hydrocarbon Processing - October 2021 - GP-7
Hydrocarbon Processing - October 2021 - GP-8
Hydrocarbon Processing - October 2021 - GP-9
Hydrocarbon Processing - October 2021 - GP-10
Hydrocarbon Processing - October 2021 - GP-11
Hydrocarbon Processing - October 2021 - GP-12
Hydrocarbon Processing - October 2021 - GP-13
Hydrocarbon Processing - October 2021 - GP-14
Hydrocarbon Processing - October 2021 - GP-15
Hydrocarbon Processing - October 2021 - GP-16
Hydrocarbon Processing - October 2021 - GP-17
Hydrocarbon Processing - October 2021 - GP-18
Hydrocarbon Processing - October 2021 - GP-19
Hydrocarbon Processing - October 2021 - GP-20
Hydrocarbon Processing - October 2021 - GP-21
Hydrocarbon Processing - October 2021 - GP-22
Hydrocarbon Processing - October 2021 - GP-23
Hydrocarbon Processing - October 2021 - GP-24
Hydrocarbon Processing - October 2021 - GP-25
Hydrocarbon Processing - October 2021 - GP-26
Hydrocarbon Processing - October 2021 - GP-27
Hydrocarbon Processing - October 2021 - GP-28
Hydrocarbon Processing - October 2021 - GP-29
Hydrocarbon Processing - October 2021 - GP-30
Hydrocarbon Processing - October 2021 - GP-31
Hydrocarbon Processing - October 2021 - GP-32
Hydrocarbon Processing - October 2021 - GP-33
Hydrocarbon Processing - October 2021 - GP-34
Hydrocarbon Processing - October 2021 - GP-35
Hydrocarbon Processing - October 2021 - GP-36
Hydrocarbon Processing - October 2021 - GP-37
Hydrocarbon Processing - October 2021 - GP-38
Hydrocarbon Processing - October 2021 - GP-39
Hydrocarbon Processing - October 2021 - GP-40
Hydrocarbon Processing - October 2021 - GP-41
Hydrocarbon Processing - October 2021 - GP-42
Hydrocarbon Processing - October 2021 - GP-43
Hydrocarbon Processing - October 2021 - GP-44
https://www.nxtbook.com/gulfenergyinfo/gulfpub/HPI-Market-Data-2023-v3
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https://www.nxtbook.com/nxtbooks/gulfpub/catalyst_handbook_2020_v2
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https://www.nxtbook.com/nxtbooks/gulfpub/hp_201812
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