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Installation, Operation and Maintenance Manual
MAN-03-04-103-0738-EN Rev. 1
Section 15:
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Additional Safety Instructions
Additional Safety Instructions
for Actuators used in
Emergency Shut-down Service
or IEC 61508 safety integrity
level (SIL) Compliant Installations
The actuator will move a valve to the designated safe position per the actuator
design within the specified safety time.
The actuator has met the systematic requirements for SIL-3.
The actuator is a Type A device with a hardware fault tolerance (HFT) = 0.
If the automated partial valve stroke test (PVST) diagnostics is used, the
diagnostics time is the PVST test interval.
Customer is required to confirm the actuator is operated within the listed
temperature limitations shown on page 1.
Customers may voluntarily register their actuator by contacting Biffi actuator
sales department.
Actuators should be inspected for proper functioning and signs of deterioration
every 100,000 cycles or annually (whichever comes first) under normal operating
conditions. Inspect more frequently under severe operating conditions defects
should be repaired promptly.
Normal operating conditions are: Air Quality within ANSI/ISA-7.0.01
standards; operating temperature and pressures consistent with the actuator
nameplate and catalog limits; environment free from excessive particulates;
operating environment consistent with the actuator materials of construction.
Under these conditions, actuator life can exceed a million cycles.
The recommended minimum operating interval is six months and a partial
stroke is acceptable to confirm that the installation is functioning.
When an actuator has been repaired or any maintenance is performed, check
the actuator for proper function (proof testing). Any failures effecting functional
safety should be reported to the Pelham facility.
IEC 61508 (SIL) installations should consult the Emerson factory to obtain the
assessment and FMEDA report, which include failure data, PFDAVG, and other
associated statistical data to establish or satisfy SIL level or requirements. This
information is available in report MOR 12\04-064 R001 V1 R1 FMEDA.
Proof testing of the actuator shall be performed on the interval determined per
IEC 61508 / IEC 61511 requirements. A suggested proof test is included in report
MOR 12\04-064 R001 V1 R1 FMEDA. No special tools are needed. The report
includes the achieved proof test coverage.
Service and maintenance on actuators shall only be performed by personnel
trained in Safety Integrity Systems (SIS) operations and in the repair and
maintenance procedure for Biffi actuators.
Section 15: Additional Safety Instructions
May 2020
31
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