Masoneilan SVI II ESD Quick Start Guide
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© 2018 Baker Hughes, a GE company, LLC. All rights reserved.
Introduction
This section provides information necessary to design, install, verify and maintain a Safety Instru-
mented Function (SIF) utilizing a Masoneilan Smart Valve Interface, SVI II ESD. This manual pro-
vides necessary requirements for meeting the IEC 61508 or IEC 61511 functional safety
standards.
Terms and Abbreviations
The following terms and abbreviations are related to safety functions of the SVI II ESD and are
used throughout this document.
Safety
Freedom from unacceptable risk of harm.
Functional
Safety
The ability of a system to carry out the actions necessary to achieve or to
maintain a defined safe state for the equipment / machinery / plant /
apparatus under control of the system.
Basic
Safety
The equipment must be designed and manufactured such that it protects
against risk of damage to persons by electrical shock and other hazards
and against resulting fire and explosion. The protection must be effective
under all conditions of the nominal operation and under single fault con-
dition.
Safety
Assess-
ment
The investigation to arrive at a judgment - based on evidence - of the
safety achieved by safety-related systems.
Fail-
Safe State
State where the SVI II ESD is de-energized and has exhausted Actuator 1
in a single acting configuration or has caused Actuator 1 to be at an equal
or lower pressure than Actuator 2 in a dual acting configuration.
Fail Safe
Failure that causes the valve to go to the defined fail-safe state without a
demand from the process.
Fail
Dangerous
Failure that does not respond to a demand from the process (i.e. being
unable to go to the defined fail-safe state).
Fail
Dangerous
Unde-
tected
Failure that is dangerous and that is not being diagnosed by automatic
stroke testing.
Fail
Danger-
ous
Detected
Failure that is dangerous but is detected by automatic stroke
testing.
1. Safety Information
