Safety Instrumented Systems (SIS) – including SIL Verification, Safety Requirements Specifications (SRS), Test Plan Development and Optimization, Validation, Verification, and Functional Safety Assessment – primarily using our Vertigo™ SIS Lifecycle Management Software, and Open PHA™ HAZOP/LOPA Documentation Software.

Safety Instrumented Systems are designed to implement the Safety Instrumented Functions (SIF) to safeguard critical processes in the case of an unacceptable deviation in the process. An SIS system is composed of sensors, logic solvers, and final elements and the logic solver is programmed to act on the deviation to place the process in a safe state.

Kenexis provides several types of engineering services from verifying the SIL is met to complete SRS documentation package and continued engineering support to keep the SIS safe and reliable.

SIL Verification includes determination of probability of failure on demand, spurious trip rates, and other performance metrics. SIL Verification considers the type of equipment employed, advanced voting arrangements, diagnostics, and testing frequency. Once SIL Selection (performance target) is completed (usually using LOPA), achievement of the SIL Selection is verified using SIL Verification. SIL Verification can be calculated easily with our database in Vertigo™ SIS Safety Lifecycle software.

Safety Requirements Specification (SRS) encompass all of the requirements developed during the risk analysis and conceptual design phases of the safety lifecycle, and other safety critical requirements, collected and presented in a design basis document referred to as SRS. The SRS is used for subsequent detailed design engineering of the actual SIS System. All SRS data can be maintained easily throughout an SIS lifecycle with Vertigo™ SIS Safety Lifecycle software.

Test Plan Development and Optimization, Validation, and Verification ensure the ongoing integrity of a SIS throughout its lifecycle requires vigilant maintenance and testing practices that are aligned with the risk analysis assumptions and requirements specifications.

Functional Safety Assessment verifies that the SIS is designed in compliance with the ISA/IEC 61511 and best practices of peer organizations.

Continuing Engineering Support service is used by companies to have an independent third party monitor and track actual equipment performance against assumptions, audit system activity and changes so that system performance and equipment changes are reconciled with initial assumptions and specifications.