VDI/VDE 2180 BLATT 4
Safeguarding of industrial process plants by means of process control engineering - Verification of the hardware safety integrity of safety instrumented systems
| Organization: | VDI |
| Publication Date: | 1 July 2010 |
| Status: | inactive |
| Page Count: | 23 |
| ICS Code (IT applications in industry): | 35.240.50 |
| ICS Code (Industrial process measurement and control): | 25.040.40 |
scope:
The present guideline is only valid in conjunction with the complete guideline VDI/VDE 2180. The methods described are used to verify the required Safety Integrity Level (SIL) of the hardware for the safety instrumented system (SIS).
This verification consists of two parts. Firstly, there is the evaluation of structural suitability. Secondly, SIL qualification of an SIS is dependent on its safety-related probability of failure (PFD). The following factors influence the outcome:
• choice and reliability of equipment,
• structural design and
• test proof interval of the SIS.
Note: The processes of proven-in-use and type-testing both have the aim of excluding systematic faults within devices. Both classes of device are also taken into consideration within the NE 93 statistics. That follows that proven-in-use and type-tested devices in this guideline are to be treated equally with respect to systematic and spurious faults.
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