20
Competence in Functional Safety
Functional safety of globe valves, rotary plug valves, ball valves and butterfly valves
6.2 Electrical installation
Responsibility
Only cables with the prescribed outer diameter of the cable glands may be used.
For EExi circuits the electrical cable data must comply with the data taken as
the basis during planning.
Cable glands and cover screws must be fastened tightly to ensure that the degree of
protection is met.
Only devices with suitable equipotential bonding may be connected.
The installation regulations for the respective explosion protection measures must be
observed.
Prior to start-up, the voltage must be checked to ensure that it meets the permissible
range.
Prior to start-up, the necessary verifications (verification of intrinsic safety) must be
available.
The effect of disturbances to lines must be checked, especially
– disturbance caused by EMC influences and
– disturbance caused by capacitance influences when long lines are used (risk that
a solenoid valve remains energized).
The special conditions specified in the explosion protection certificates must be
adhered to.
Operator
6.3 Installation of control valves
Control valves must be installed free of stress and with low degrees of vibration.
After installation, the flange joints must be checked for leaks.
The pipeline must be rinsed prior to installing the control valve.
Operator
