SIS-TECH Solutions LP

Automated Independent Backup (AIB) system
The Automated Independent Backup (AIB) system is a stand-alone, automated safety instrumented system (SIS). It is suitable for legacy process control systems where users have implemented safety logic in a distributed control system’s (DCS) software but the DCS does not meet modern safety specifications. The system can be installed to provide either Safety Integrity Level 2 (SIL2) or Safety Integrity Level 3 (SIL3) protection, without requiring any changes to the existing hardware or DCS software. It can also be used on new control systems at a lower installed cost than a safety programmable logic controller (PLC).

SIL Solver
SIL Solver is an advisory software package intended for use in verifying the safety integrity level (SIL) of safety instrumented functions (SIF) and other protective instrumented functions (PIF). It uses globally recognized calculation methods defined in appropriate standards and methodologies including: ANSI/ISA 84.00.01-2004/IEC 61511; ISA TR84.00.02; and CCPS Chemical Process Quantitative Risk Analysis (CPQRA). Using a Microsoft Windows graphical user interface (GUI), the software integrates an extensive device database with simplified fault-tree-analysis equations to form a SIL verification tool. In addition to calculating the probability to fail on demand average (PFDavg), SIL Solver also calculates the mean time to failure spurious (MTTFsp) thereby ensuring that the SIS/PIF design meets the desired reliability. The device database is password-protected and includes dangerous and spurious failure rates, common cause factors, diagnostic intervals, and diagnostic coverage for more than 150 devices. Each device datasheet lists the assumptions made relative to the device boundary, diagnostics, common cause factor, and data source. Default data cannot be changed or altered, ensuring user assessments are always performed with approved data.