Generally
The maintenance service for a company´s
process machinery is of vital significance or importance for operating
security it´s availability and reliability.
To ensure operating security it´s availability
and reliability, computer functions shall be available for stop planning,
material storage etc.
A log system shall be available who continuously
and rapidly supervise the machinery and functions state.
Disturbances and failures shall be indicated
and reported to aid maintenance people in quickly repairing
the failure.
In continuous processes where every stop implies
loss of production and increased costs, is that important.
For exmple, a modern papermachine that produces
newspaper continousuly 24 hours a day will cost about 100000 swedish crown
every hour the machinery remains idle.
With such stop-time costs, it is easy to understand
how important it is to minimize stop time.
Operating security in the process industry.
Profitability in process industries depends on
many factors. Operating security is of gratest significance.
When planning and making projections for a plant,
it is critically important to deal with fundamental security questions.
It is important to select correct, highly reliable
equipment and components and to accurately determine the equipment´s
maintenance issues in prevention and acute maintenance.
.
It is also important that maintenance activity
is well organized and that the competence of maintenance presonnels matches
the complexity needs of the equipment.
Redundancy requirements are sometimes necessary
in complex electronic systems. In that way, it may be possible to avoid
process stoppage due to disturbances in the control system.
Factors that influence operating security
Operating security is measured by process availability and depends on the security requirements in the process, ability in maintenance, and maintenance security.
Security in complex integrated functions
is measured by the probability of failure and
is mentioned as the number of failure per unit of time or in average time
between failure, MTBF (Mean Time Between Failure ).
Ability in maintenance
are measured by what is required in equipment
repairs and maintenance and can be measured by time of repair and costs
of repairs per failure.
Maintenance security
depends on the resources and maintenance organization
such as: personnel, spare parts, assistance for maintenance etc.and can
be measured by costs for spare parts and waiting time for failure repair.
Security in operation depends, therefore, partly on the equipment´s technical performance, partly on the components´ quality for reliability and accuracy, and partly on the maintenance availability of personnel resources, technical assistans and spare parts.
Summary
To sum up, we can say that operating security
has the gratest impact on the profitability of an industrial investment
in the short as well as long view.
It is seldom profitable to install equipment
at the lowest costs, if one fears increased problems with security.
Therefore, it is important during all phases
of a project, from pre-planning to starting operation-to think about the
security questions both in strictly profitable view and in personnel security
view.
In the planning and the thechnical build up of
control systems, it is necessary to test the demand on functions and components.
It is also particularly importment to study the
technical build-up of personnel from both a security and maintenance view.
It is also important to think about how the process
equipment will be adapted to meet increased production volume and quality.
It is a doubtful investment to implement existing
old equipment with a more accuracy control system if the process equipment
doesn´t have adequate performance.
It is important to take into consideration that
installed equipment shall function well for a profitable production during
the equipment´s total life time with an adpted maintemance service.
The resulting operation security depends on the
equipment´s failure frequency, partly on the maintenance organizations
capacity to realize prevention maintenance and to anticipate failure.
Both material and personnel resources should
be availibel and adapted to the equipment.
Of gratest important is also the dokumentation
for operation security.
The dokumentation must be well-structured and
well-organizt so that the maintenance function shall operate quickly and
well without too long a stoppage in the operation.
The dokumentation shall be adapted to what you
need so that everyone who needs it gets the basic he needs in his work
.
Well-made dokumentation adapted to the user increases
the equipment´s availability and reduse operating and maintenance
costs.
Finally, the education of personnel is important
to the security. Maintenance personnel competency must be adapted to the
equipments technical level.
In the case of existing equipment or in new or
changed equipment, personnel must complete or renew their education.