COTEMAR S.A. DE C.V.

FUNCTIONAL SAFETY LIFE CYCLE FOR THE STARTUP OF THE ABKATUN-A COMPRESSION PLATFORM WITH THE MODULES 1 AND 2 OF THE ABKATUN-A COMPLEX.

CONTEXT OF THE PROJECT

As a result of the startup of operations of the Abkatun-A Compression platform with modules 1 and 2 belonging to the Abkatun-A Complex, and for purposes of complying with the regulations on Process Risk Management and Functional Safety Lifecycle (FSL) according to the current standards of Petróleos Mexicanos (PEMEX) / IEC 61511.

OBJECTIVE

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

TECHNICAL CONTEXT

As part of the development of the Functional Safety Lifecycle (FSL) in the Abkatun-A Compression with the modules 1 and 2 the hazards and the hazardous events of the process and their associated equipment were determined, as well as the sequence of events that lead to the hazardous events, the associated process risk derived from the hazardous events, the requirements of risk reduction, the functions required of safety to obtain the necessary risk reduction and determine if any of the safety functions suggested are 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 parameters of performance of the SPPE, were defined in this project as a Verification of SIL measure based on the required safety integrity level (SIL Objective).

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

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

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 ESS (Capacity and response time of the performance – Process Safety Time and analysis of operating deviations of the activation of the logic of the ESS).

RESULTS OBTAINED

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