Jun,29

API RP 554-3-2021 pdf download

API RP 554-3-2021 pdf download

API RP 554-3-2021 pdf download.Process Control Systems- Project Execution and Process Control System Ownership .
1 Scope 1.1 General This recommended practice (RP) addresses the processes required to successfully implement PCSs for oil and gas production, refinery, and petrochemical services. The major topics addressed are listed below. – Part 1. The basic functions that a PCS may need to perform, and recommended methodologies for determining the functional and integration requirements for a particular application. 一Part 2. The practices to select and design the installation for hardware and software required to meet the functional and integration requirements. – Part 3. The project organiz ation, skills, and management required to first execute a process control project and then to own and operate a PCS. Figure 1 shows the general overall scope of oil and gas production, refinery process control, and the associated automation functions, as well as the portions of which this recommended practice addresses. The general scope of the material covers general industrial process control topics that are applicable to oil and gas production, refineries, and petrochemical facilities. The user is cautioned to fully consider the requirements of the particular applications and circumstances that may exist and carefully apply the concepts described in this RP as appropriate. This document is not intended to present a tutorial on the subjects discussed, but rather to aid the reader in identifying and understanding the basic concepts of PCSs. The references provided within the document direct the reader to publications that describe one or more subjects in greater detail than is necessary or desirable for the purposes of this document.
1.2 Document Organization This document is organized to follow the sequence of activities associated with the typical life cycle ofa PCS as summarized in Table 1. The life cycle phases as they apply to PCSs are as follows. -Appraise. Develop business goals and requirements and identify basic functions required. This step is often also referred to as the concept stage. -Select. Further develop business goals and functions into a PCSs scope definition. This step often is part of the early portion of front- end engineering design (FEED). – Define. Finalize PCSs scope definition, select hardware and software, and prepare all applicable design drawings, specifications, and procure other hardware and equipment. This step often forms the bulk of FEED. -Execute. Developdetailed design and procurement, construction/installation, checkout, testing, commissioning. -Operate. Commission, operate, and maintain. API 554 consists of three parts, each focusing on a major aspect of PCSs. The three parts and the areas that they cover are as follows. – Part 1, Process Control System Functions and Functional Specifications. Covers the basic functions that a PCS may need to perform, and describes recommended methodologies for determining the functional and integration requirements for a particular application. – Part 2, Process Control System Design. Covers the hardware and software applied to PCSs and provides recommendations for implementation. Design considerations and references to design practices for control centers and other control system buildings and enclosures are also provided. – Part 3, Process Control System Project Execution and Ownership. Covers project organization, skills and work processes required to first execute a process control project and then to own and operate a PCS. The portions of API 554 that deal with each phase of the life cycle are identifed in Table 1.
3.1 batch control Control functions that occur in a series of complex steps or phases that may combine continuous control, sequence control, and discrete control to execute a processing scheme. 3.2 commissioning The process of preparing a PCS and all of its components and field instrumentation for operation after all loop testing and validation testing has been completed. 3.3 continuous control Control functions that are continuously and repetitively executed to control the values of process variables such as pressure, temperature, flow, etc. that are part of a continuous process such as a refining process, or within a portion of a process associated with a batch control system. 3.4 control loop That part of an instrument control system that includes the input sensor, transmitter, communication path, control algorithm, and final control element. Control algorithm may be executed as one of many such algorithms in a PCS or be performed by stand-alone electronic, pneumatic, or mechanical devices. 3.5 discrete control Control functions that involve on-off operations and interlocks. Discrete control variables are generally associated with thresholds above or below which a control action is taken. The control action is a discrete function such as opening or closing a valve, starting or stopping a motor, etc.

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