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One of the major problems for enterprises of oil refinery,
petrochemical, chemical and other industries is determination of the
current technical state of equipment. The decision of this problem is
especially pressing for facilities operating over their normative
lifetime.
Because of the long periods of structures operation and annually
growing intensity of emergency failures which result in formation of
service defects in metal as walls corrosive and erosive wear,
discontinuity flaws, exfoliation and cracks, the use of traditional
discrete methods of inspection becomes ineffective due to the great
labor input, impropriety and locality of these inspection methods.
The radical way for ensuring the required level of structure
maintenance reliability is the application of complex diagnosis
monitoring (CDM) systems.
The practical experience shows that the CDM systems:
- make possible to increase the predictability level of process
equipment current state and carry out hardware check of the facilities
technical state, and operation of the whole system with sending the
results directly to the executive;
- offers increase of the technical devices safe operation and
reduction of the premature corrosive wear of process equipment
assemblies, early detection of the mounting and welding defects and
increase of the process equipment overhaul life;
- reduces costs for the equipment periodic inspections and repair due
to early detection of defects.
The CDM systems enable the execution of a continuous check
(monitoring) of the facility technical state when in service on the
basis of different NDT methods, methods for measuring the stress-strain
state, means for measuring the process working parameters, and methods
for observing the factors effecting on facility damaging.
The necessity of CDM systems installation is reasonable at
the facilities having the following features:
- the structural failure may cause considerable material and
ecological losses, human victims;
- access for carrying out the structure periodic inspection and check
is hindered or impossible;
- a significant amount of preparatory works and works on periodic
check at the facility requires its partial or full shutdown, and
building of auxiliary structures for conducting this inspection;
- the structure has low operational life;
- requirements of guideline.
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