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.
