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Masoneilan Products SVI II ESD - GE Energy

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Safety Information<br />

1<br />

Introduction<br />

This section provides information necessary to design, install, verify and maintain<br />

a Safety Instrumented Function (SIF) utilizing a <strong>Masoneilan</strong> Smart Valve<br />

Interface, <strong>SVI</strong> <strong>II</strong> <strong>ESD</strong>. This manual provides necessary requirements for meeting<br />

the IEC 61508 or IEC 61511 functional safety standards.<br />

Terms and Abbreviations<br />

The following terms and abbreviations are related to safety functions of the <strong>SVI</strong> <strong>II</strong><br />

<strong>ESD</strong> and are used throughout this document.<br />

Safety<br />

Functional<br />

Safety<br />

Basic<br />

Safety<br />

Safety<br />

Assessment<br />

Fail-<br />

Safe<br />

State<br />

Fail Safe<br />

Fail<br />

Dangerous<br />

Freedom from unacceptable risk of harm.<br />

The ability of a system to carry out the actions necessary to achieve or<br />

to maintain a defined safe state for the equipment / machinery / plant /<br />

apparatus under control of the system.<br />

The equipment must be designed and manufactured such that it protects<br />

against risk of damage to persons by electrical shock and other<br />

hazards and against resulting fire and explosion. The protection must<br />

be effective under all conditions of the nominal operation and under<br />

single fault condition.<br />

The investigation to arrive at a judgment - based on evidence - of the<br />

safety achieved by safety-related systems.<br />

State where the <strong>SVI</strong> <strong>II</strong> <strong>ESD</strong> is de-energized and has exhausted Actuator<br />

1 in a single acting configuration or has caused Actuator 1 to be at<br />

an equal or lower pressure than Actuator 2 in a dual acting configuration.<br />

Failure that causes the valve to go to the defined fail-safe state without<br />

a demand from the process.<br />

Failure that does not respond to a demand from the process (i.e. being<br />

unable to go to the defined fail-safe state).<br />

1

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