ARPO designs and prepares works related to the functional safety analysis based on the international codes IEC-61511, ISA-S.84.00.01-2004, applicable API's, etc., beside relying on the local or own users codes, such as the PEMEX reference codes NRF-045 and 011 among others. For it, ARPO uses tools of specializing software licensed in favour of ARPO,with top technology for the calculation and execution of analysis of the different parameters and metric that define the availability and the correct design and implantation of one SIS. Among the documents related to the functional safety that ARPO has the aptitude to develop the following ones are:

• Hazard and operability HAZOP analysis
• Specification of functional safety requirements (SRS)
• Selection and calculation of objective SIL
• Validation and calculation of failure probabilities under demand (PFD)
• Verification of objective SIL accomplishment and maintenance recommendations listing
• Risk consequences and reduction factors analysis
• Environmental Impact assessments
• Construction risk assessments
• Safety Instrumented Systems auditing
• Causes and effects matrixes
• SIS Management System implantation