On a frequent basis Kenexis identifies issues surrounding the implementation of engineered safeguards and application of industry standards for these safeguards that require additional research and explanation. Guidance on resolving these issues is provided to our staff in the form of technical memos.

TM - 010 - Acceptable Sharing of BPCS and SIS Field Measurements

Many users of safety automation equipment employ a practice of using redundant field devices for safety-critical process measurements. Occasionally, these redundant devices are used for both safety and process control applications. In general, separation of SIS and BPCS components are the ideal design from the standpoint of safety. However, for a small number of applications separation of field devices is not always required . This memo reveals potential applications where the use of shared field devices may be acceptable as well as addressing the strengths and weaknesses of a design using shared devices.
TM - 010 - Sharing of BPCS/SIS Devices (PDF - 47k)

TM - 005 - BPCS / SIS Separation Requirements

In some cases, separation of the BPCS and SIS is absolutely essential. This memo presents some guidelines for when separation is required, and when some degree of overlap can be accepted.
TM-005 BPCS / SIS Separation Requirements (PDF - 26k)

TM - 004 - Motor Start SIL Verification Issues

Pump and compressor motor starters are a very common final element of safety functions in the process industries. SIL verification conceptual design requires understanding of the details of how various motor starters work and what is represented in their reported failure characteristics.
TM-004 Motor Starter SIL Verification Issues (PDF - 133k)

TM - 003 - Sulfur Recovery Unit Back Flow Scenario

A sulfur recovery unit (SRU) safety instrumented function that has significant potential consequence, but is not often safeguarded against is explained and recommendations for inclusion in SRU SIS design basis studies are provided.
TM-003 SRU Back Flow Scenario (PDF - 33k)

TM - 002 - IPF Naming Conventions

This memo explains the Kenexis standard naming convention for the description of instrumented protective function actions. This memo should be used as a basis for completing the IPF Description column in the Kenexis SIS Design Basis Toolkit.
TM-002 IPF Naming Conventions (PDF - 28k)

TM - 001 - Sulfur Recovery Unit KO Pot Common Cause Failures

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