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MK LIT (E5) 01/2021 page 32/172
• Safety, control, or regulating devices to determine whether ventilation systems, gas warning devices,
inerting devices ensure the proper functionality.
• Connection elements and other technical devices (such as lightning protection, requirements for floors)
with regard to their condition, their interconnections, and their installation / assembly for explosion safety
(e.g. type of installation, insulation resistance of electrical cables and lines)
• Take into account the significant interactions of devices, protective systems, safety, control, or regulating
devices and their connecting elements – with each other and with other system parts. This includes, for
example, testing the equipotential bonding, the involvement of pipes in equipotential bonding, overvolt-
age protection, and lightning protection, alignment of units.
6.2.3 Inspection after changes requiring review
Prior to recommissioning after changes subject to mandatory inspection, a full inspection of the system as
a whole is required.
There is a need for a change requiring review if the safety of the system is affected by the change. Changes
requiring review are evaluated in accordance with applicable national regulations. Checks after a change
requiring review may be limited to the changes made. Verify whether the system has been changed in
accordance with the regulations and is working properly. See the requirements for initial commissioning
(chap. 6.2.1).
6.2.4 Recurring tests
Plants must be tested in their entirety on a recurring basis in accordance with the relevant regulations. The
recurring tests serve to maintain the safety of the system. Among other things, the actual state of the system
is compared with the target state (according to the safety plan and available test records.
Extinguishing systems/ fire suppression systems must be tested at least every 2 years. Testing of ventila-
tion systems, gas warning and inertization equipment must be carried out at least annually.
Periodic testing, e.g. of devices, protection systems, etc., as well as ventilation systems, gas warning and
inertization devices can be partially dispensed with if a tested maintenance concept is available. The full
inspection of the entire system remains unaffected by this.
6.3 Proof of tests
The results of the tests in accordance with sections must be recorded in a test log or test report. This also
applies to identified defects or concerns regarding the operation of the system.
Proceed in accordance with the relevant national regulations.
For Germany, please pay particular attention to DGUV Information 205-026 on retention of records.
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