COTEMAR S.A. DE C.V.

FUNCTIONAL SAFETY LIFE CYCLE FOR SAFETY INSTRUMENTED FUNCTIONS OF THE EMERGENCY SHUTDOWN SYSTEM IN C.P. AKAL-B.

CONTEXT OF THE PROJECT

As a result of the electromechanical work that will be carried out in the Akal-B Process Center (C.P. Akal-B) for the management of the separate production of the Ek-Balam field, belonging to the Cantarell Production Asset located in the Gulf of Mexico, and in order to give regulatory compliance with the Process Risk Management and the Functional Safety Life Cycle (FSLC) according to the current standards of Petróleos Mexicanos (PEMEX) / IEC 61511.

OBJECTIVE

Design an Emergency Shutdown System (ESS) that complies with the standards IEC-61511, IEC-61508 and ANSI/ISA 84.00.01, to ensure the safety of the installation at a tolerable level, increasing the reliability and reducing the false alarms of each Safety Instrumented Function (SIF) belonging to the SPPE.

TECHNICAL CONTEXT

As part of the development of the Functional Safety Lifecycle (FSLC) on the Akal-B Production Platform belonging to the C.P. Akal-B, the hazards and hazardous events of the process and its associated equipment were identified, as well as the sequence of events that lead to the hazardous events, the associated process risk resulting from the hazardous events, the risk reduction requirements, the required safety functions to obtain the necessary reduction of risk and to determine if some of those safety functions identified comply with the requirements as safety instrumented functions.

The Safety Integrity Level (SIL) Objective of each Safety Instrumented Function (SIF) was determined based on the risk reduction requirements specifying the safety requirements of the Safety Instrumented System (SIS).

The calculation of PFDavg and MTTFs as performance parameters of the SIS, were defined in this project as Verification of SIL based on the safety integrity level required (SIL Objective).

Subsequently the Emergency Shutdown Logical Matrix of the Safety Instrumented System (SIS) and the operations philosophy were developed. Subsequently the Emergency Shutdown Logical Matrix of the Safety Instrumented System (SIS) were developed. In these documents the functional relations between the elements of each SIF with respect to the process were defined, indicating primary and secondary actions (effects), as well as the functioning and diagnostic specifications in the Human Machine Interface (HMI).

The functional testing procedures of each of the SIF were prepared, to maintain functional safety during their useful life to monitor and register the failures that they could reveal and the functioning conditions.

As part of the FSL the Static and Dynamic Simulation of the process is modeled through specialized commercial software with a focus on functional safety determining the process parameters and conditions according to the logic of the SPPE (Capacity and response time of the performance – Process Safety Time and analysis of operating deviations of the activation of the logic of the SPPE).

RESULTS OBTAINED

The principal benefits obtained by the Client once this project was concluded were: