Bettis CB/CBx & G-Series
IEC 61508 SIS/SIL Safety Manual
SIL Safety Manual
VAWCO2991 Rev. C
November 2017
SIL Safety Manual
VAWCO2991 Rev. C
Table of Contents
Section 1: Scope
Section 2: Purpose
Section 3: Topics
3.1 Safety function.............................................................................................. 6
3.2 Proof test procedure ..................................................................................... 6
3.3 Repair/Replace procedure ............................................................................. 6
3.4 Installation and site acceptance prodecure .................................................... 6
3.5 Application and environmental limits ............................................................ 6
3.6 Periodic maintenance requirements .............................................................. 6
3.7 Hardware version .......................................................................................... 7
3.8 Settings ........................................................................................................ 7
3.9 Functional safety data ................................................................................... 7
3.10 Archievable SIL statement ............................................................................. 7
3.11 Product lifetime limits ................................................................................... 7
Table of Contents
November 2017
Section 4: Installation, Operation & Maintenance Manual, IOM
Section 5: Technical Files
Table of Contents
3
Section 1: Scope
November 2017
Section 1: Scope
All Bettis brand CB/CBx & G-series products currently SIS/SIL certied by EXIDA using
IEC 61508 guidelines.
SIL Safety Manual
VAWCO2991 Rev. C
4
Scope
SIL Safety Manual
VAWCO2991 Rev. C
Section 2: Purpose
To ensure all the applicable safety requirements of IEC 61508 are complied with, thereby
ensuring current certied SIS/SIL levels are maintained.
Section 2: Purpose
November 2017
Purpopse
5
Section 3: Topics
November 2017
Section 3: Topics
3.1 Safety function
The CB/CBx Series and G Series actuators rotate with sufcient torque to move a valve to its
fail-safe state when hold-position air released.”
The Bettis brand Actuator Selection Procedure provides functional denition with specics
on input variables and performance.
3.2 Proof test procedure
Proof Test procedure and proof test coverage are part of the FMEDA reports which are
provided to those requiring SIS functionality, see exida report nos. EAS 16/06-010 R001
and R002. No specic tools are required for proof testing. Individual who will perform the
proof test is expected to be trained in actuator maintenance.
SIL Safety Manual
VAWCO2991 Rev. C
3.3 Repair/Replace procedure
Procedures to repair or replace the CB/CBx Series and G Series actuators are provided in the
respective IOM, see Section 4 for a listing of Bettis IOM document numbers.
Please refer to the IOM for any tools required for repair and replacement and required
competency of technicians. Maintenance and subsequent test procedures are also covered
in the IOM’s. Any failures, identied by the end-user during maintenance, repair or proof
testing, that potentially impact the functional safety of the CB/CBx Series and G Series
actuators should be reported back to Valve Automation Customer Service Coordinator.
3.4 Installation and site acceptance prodecure
Any necessary installation and site acceptance procedures are discussed in the CB/CBx
Series and G Series actuators IOM listed in Section 4. IOM denes exercising of the
actuator after installation. The IOMs also dene testing after maintenance.
3.5 Application and environmental limits
All application and environmental limits need to be observed for the CB/CBx Series and G
Series Actuators. Please observe the pressures and temperatures that are stamped on the
nameplate per European Directives.
More information can be found in the Bettis Technical Files listed in Section 5.
3.6 Periodic maintenance requirements
For the CB/CBx Series and G Series actuators the periodic maintenance requirements
should be observed, refer to the IOM documents listed in Section 4. A 5-year normal
maintenance interval is dened for the CB/CBx Series and G Series actuators.
6
Topics
SIL Safety Manual
VAWCO2991 Rev. C
3.7 Hardware version
The hardware version of the actuator can be identied from the nameplate on the actuator.
3.8 Settings
Installation and maintenance settings for the CB/CBx Series and G Series actuators are
specied in the IOMs. There are not specic safety settings to be made.
3.9 Functional safety data
Users applying the actuators in functional safety applications should contact Bettis
to obtain the assessment and FMEDA report, which include failure data, a sample
PFDavg calculation, and other associated statistical data to establish or satisfy SIL level
requirements. This information is available in exida reports EAS 16/06- 010 R001,R002 and
R003 for G FMEDA, CB FMEDA and assessment respectively.
Section 3: Topics
November 2017
3.10 Archievable SIL statement
The CB/CBx Series and G Series actuator have been assessed per the relevant requirements
of IEC 61508, Parts 1 and 2. They provided systematic integrity up to SIL 3. For random
integrity they have been designated as Type A devices with Hardware Fault Tolerance
(HFT) = 0. PFDavg and Architectural Constraints must be veried for each nal element
application. When using the CB/CBx Series and G Series actuator in a redundant
conguration, a common cause factor of at least 5% should be included in safety integrity.
3.11 Product lifetime limits
The IOM denes a 5-year minimum maintenance interval for the CB/CBx Series and G Series
actuators. This addresses components that may have age related degradation.
The remaining components are not age sensitive. Please also refer to the FMEDA reports,
exida report nos. EAS 16/06-010 R001 and R002 for the useful life of the actuators.
Topics
7
Section 4: Installation, Operation & Maintenance Manual, IOM
November 2017
Section 4: Installation, Operation &
Maintenance Manual, IOM
• 137464 CBA/CBB 315, 420, 520, 525 & 725 double-acting models
• 137465 CBA/CBB 315, 415, 420, 520, 525 & 725 spring-return models
• 137462 CBA730, 830, 930 & 1030 double-acting models
• 137463 CBA730, 830, 930 & 1030 spring-return models
• 068269 CB315, 420, 520, 525 & 725 double-acting models
• 068270 CB315, 415, 420, 520, 525 & 725 spring-return models
• 124840 G-series pneumatic models
• 124841 G-series pneumatic models with tandem power cylinders
• 124843 G-series double-acting pneumatic models with M11 hydraulic override
• 127073 G-series spring-return pneumatic models with M11 hydraulic override
• 127215 G-series pneumatic models w/tandem power cylinders & M11 hydraulic
override
SIL Safety Manual
VAWCO2991 Rev. C
8
Installation, Operation & Maintenance Manual, IOM
SIL Safety Manual
VAWCO2991 Rev. C
Section 5: Technical Files
• 136360 CB/CBA x15, x20 & x25 models for pneumatic service
• 136373 G-series models for pneumatic service
• 137569 G-series models for hydraulic service
Section 5: Technical Files
November 2017
Technical Files
9
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