API RP 970-2017 pdf download.Corrosion Control Documents.
However, these systems and components may be covered by other types of Risk-based Inspection (RBI) or risk assessment work processes, such as RCM. This recommended practice outlines the essential elements in defining, monitoring, and maintaining CCDs as a vital component of corrosion management (damage mechanism control strategies) and inspection planning, including RBI. This RP does not address process operating windows established for normal process control, for the purposes of maintaining product quality, or for other operating factors unrelated to control for the purpose of maintaining equipment integrity and reliability. However, the contents of a comprehensive, good quality CCD can be the basis for establishing Integrity Operating Windows (IOWs) in accordance with API RP 584. This RP is a guideline document for organizing Corrosion Control Documents. The owner/user of this RP may also develop internal documents that detail how their company will create and implement the processes suggested herein. Section 5 contains key points for establishing a site procedure that documents the CCD work process. NOTE Even though CCDs are labeled “Documents” for the purposes of this RP, it is recognized that much of the suggested content of a CCD may, in fact, reside in separate folders and electronic information storage sites. These separate folders and electronic information storage sites may be considered suitable alternatives to creating a separate or standalone CCD. It is not the intention of this RP to require operators to create a new document, but instead to have the components discussed in this document available for use in a work process covering integrity management.
3 Terms, Definitions, and Acronyms For the purposes of this document, the following terms, definitions, and acronyms apply. 3.1 alarm Primary method of communication for IOW Critical limit and some higher level IOW Standard limit exceedances. Typically, an audible sound (e.g. horn, buzzer, beep) along with a visual signal (e.g. flashing light) in the control room that alerts operators to a potential deviation in a process condition that may need immediate attention. 3.2 circuit A subsection of piping systems (see 3.24 for definition of “system”) that includes piping, equipment and components that are exposed to a process environment of similar corrosivity and expected damage mechanisms and is of similar design conditions and construction material where by the expected type and rate of damage can reasonably be expected to be the same. Some may refer to these as “loops” but this designation is being supplanted by the “system” or “circuit” designation. NOTE 1 Complex process units or piping systems may be divided into piping circuits to manage the necessary inspections, data analysis, and record keeping. NOTE 2 When establishing the boundary of a piping circuit, it may be sized to provide a practical package for record keeping and performing field inspection. 3.3 corrosion control document (CCD) A document or other repository or system that contains the necessary information to understand materials damage susceptibility issues in a specific type of operating process unit at a plant site. Generic CCDs can also be developed that provide generic guidance upon which to build a unit-specific CCD, but generic CCDs are not as useful as unit- specific CCDs that are based on actual hardware configurations, actual process conditions and actual materials of construction.
3.6 integrity operating window (IOW) Established limits for process variables (parameters) that can affect the integrity of the equipment if the process operation deviates from the established limits for a predetermined amount of time (includes Critical, Standard and Informational IOWs). Guidance on setting IOWs is given in API RP 584. 3.7 IOW critical limit An established IOW level which, if exceeded, could cause rapid deterioration such that the operator should take immediate predetermined actions to return the process variable to the acceptable IOW range to prevent significant defined risks of potential equipment damage or hazardous fluid release could occur in a short timeframe. Other terminology has been used in place of Critical Limit, such as Safe Operating Limit, Key Operating Limit, Standard Reliability Limit, or Reliability Operating Limit.