SIS

Safety Instrumented Systems (SIS) play a critical role in protecting many industrial process and automation systems.

Safety Requirements Specifications (SRS) Development
We assist customers with developing their SRS in compliance with ANSI/ISA S84.00.01-2004 (IEC 61511 mod). These documents are used to specify the functional and integrity requirements of the SIS.

Safety Instrumented Function (SIF) Design Evaluation - Safety Integrity Level (SIL) Verification
Our SIF modeling and design expertise ensures compliance with ANSI/S84.00.01-2004 (IEC 61511 mod). We design SIFs to meet our customers' risk reduction and plant availability requirements.

We also review our customers' existing shutdown systems and protective functions to determine the SIL achieved by each protective function. Plant availability is critical to our customers; spurious trips can be costly. As such, we recommend areas where the design of existing shutdown systems can be modified to reduce the spurious trip rate and increase up time.

SIS Design and Implementation
We design, configure, test, commission, validate, and perform SIS startup services. We also provide the necessary ANSI/S84.00.01-2004 (IEC 61511 mod) compliant documentation.

Proof Test Procedure Development
SIFs must be tested periodically to ensure that the calculated probability of failure on demand (PFD) is maintained. This is a requirement of ANSI/ISA S84.00.01-2004. We assist customers in developing proper proof test procedures to ensure compliance with this standard.