17th February, 2010. Today the Developer Team Of SIL4S Ltd announces the immediate availability of the Tool4S Software: tool4sdemo.sil4s.com.

In 2005, we started the development of web based HAZOP study software aiming for the following goals:

Web based SW

• The SW follows the IEC 61511 (ANSI/ISA—84.00.01—2004) standard life cycle philosophy
• A multi-user SW, i.e. several users can work on the same project simultaneously
• The HAZOP part of the SW matches the EN 61882 HAZOP study Standard
• LOPA part of the SW uses the cumulative LOPA method and calculates the target SIL and target RRF values automatically.

Tool4S is running either on:

• Individual laptop
• SIL4S server
• Company Server with dedicated license.

We split the task into three separate activities:

• HAZARD and Risk analysis according to IEC 61511 Safety Life Cycle Phase 1 (HAZOP)
• Allocation of safety function to protection layers according to IEC 61511 Safety Life Cycle Phase 2 (LOPA)
• Safety Requirements Specification (SRS) for SIS according to IEC 61511 Safety Life Cycle Phase 3 .

The advantage of HAZOP and LOPA integration is:

•     Common database saves time by avoiding multiple repeated activity
•     Homogeneity of the Safety documentation
•     One SW for one task/project.