INTRODUCTION / PURPOSE:
The purpose of these instructions is to clarify the activities
that must be completed, and to specify the most important
documentation to be prepared for the technical supervision
This technical supervision can be performed as a separate
activity within the scope of complete technical supervision,
of which a separate section of the Ex-Document is issued.
This technical supervision (maintenance) can also be performed
within the scope of other technical supervisions (KL, EIE,
EII, URE, URI, NEU and OUP), and is not issued as a separate
section of the Ex-Document (TN-OD) but the assessment (supervision)
of maintenance is included in the above-mentioned sections.
This technical supervision is based on the requirements of
standard HRN EN 60079-17 as well as other related standards.
Through technical supervision of maintenance, Ex-Agency checks
the project documentation which accompanies plant maintenance
procedures in areas at risk of explosive atmospheres, and
checks the conformity of the actual condition with the documentation
which, among others, also involves analysis and verification
• establishment of a maintenance system (as
an activity) and its technical supervision by Ex-Agency,
• availability of maintenance manuals,
• records of all activities performed on the equipment with
respect to technical modifications (e.g. which may affect
the area classification performed), relating to maintenance,
modifications, additions, etc. on the equipment and installations,
• the current and actual condition of explosion protection
of equipment (at the level of visual or control inspection
• efficiency of the maintenance system (with respect to explosion
protection) and proposing modifications, additions, improvements,
etc. to the type and schedule of inspections.
Technical supervision of maintenance is based on the Ex-manual
of the plant.
There are two categories (types) of maintenance system organization:
• The user has his own organized maintenance system which
is approved by Ex-Agency’s technical report (TN-ODP), that
is, the user has a “complete” Ex-manual of plant maintenance.
• The maintenance is performed by an outside service company
that has an Ex-manual of maintenance activities approved by
Ex-Agency’s technical report (TN-ODA). In this case the user/plant
owner has a “shortened version” of the Ex-manual which specifies
the basic guidelines of the maintenance system (e.g. inspection
schedule, responsible persons, record-keeping, contract with
service company, method of implementing the system, etc.).
Please note that these instructions contain only “typical
requirements” of documentation which include most plants and
can differ to a lesser or greater degree for some types of
plants. In this sense it is necessary to keep in mind that
certain plants require other documentation which is not listed
in these “illustrated” instructions. The instructions also
show only the basic requirements without demonstrating technical
details. Technical (comprehensive) details are defined by
standards from the explosion protection field, Ex-Council
decisions, positive engineering practices, etc.
Before the start of technical supervision, it is necessary
to complete the project documentation so that it contains
the minimum documentation described in these instructions.
REQUIRED DOCUMENTATION, CERTIFICATES, REPORTS:
• System of records and data-keeping (either electronic or
in the form of equipment card files) of the electrical and
non-electrical equipment and installations in areas at risk
of explosive atmospheres, and records of activities and inspections,
past and present, on said equipment,
• Documentation of eventual repairs (in accordance with HRN
• Documentation of periodical (or continuous) checks and tests
on electrical and non-electrical installations,
• Documentation on technical modifications performed, maintenance
activities on technical installations, etc., which may affect
the area classification performed.
The above-mentioned maintenance system (as an activity) must
be certified by technical supervision of Ex-Agency (with respect
to system organization, qualifications and responsibilities,
operational procedures, etc.).