Api Rp 586 Pdf May 2026

API RP 586 , officially titled " NDT Methods for Equipment Damage Mechanisms

," is a suite of Recommended Practices (RPs) developed by the American Petroleum Institute (API) to provide guidance on selecting and using non-destructive evaluation (NDE) techniques for specific damage mechanisms. Inspectioneering

Because this is a multi-part standard, what you need depends on the specific equipment or damage you are analyzing. As of recent drafts, the standard is organized as follows: API RP 586-1: Heat Exchanger Tubing Inspection

: Focuses on electromagnetic and ultrasonic testing for shell-and-tube and air-cooled heat exchangers.

API RP 586-2: Inspection for High Temperature Hydrogen Attack (HTHA)

: Provides critical guidance on advanced ultrasonic testing (UT) methods like Phased Array (PAUT), Time of Flight Diffraction (ToFD), and Full Matrix Capture (FMC/TFM) to detect early-stage HTHA. API RP 586-3: NDE for Contact Point Corrosion (CPC)

: Addresses inspection methods for corrosion occurring at pipe-to-support interfaces. Where to Find the Documents

Since these are technical standards, they are generally not available for free legally. You can obtain them through official standard distributors: Official API Publications API Publications Store is the primary source for the final, published versions. Standards Aggregators

: You can purchase the PDF versions from recognized retailers like Accuris (formerly IHS Markit) Technical Summaries api rp 586 pdf

: For a high-level overview of the research behind the HTHA section, you can review technical papers from Inspectioneering Journal Using the Right NDT and Inspection for Damage Mechanisms

The API RP 586 document, titled Internal Inspection of Carbon Steel Equipment

, is a Recommended Practice developed by the American Petroleum Institute. It focuses on the technical aspects and methodologies for inspecting the internal surfaces of carbon steel pressure vessels, piping, and other equipment used in the refining and petrochemical industries. Key Aspects of API RP 586:

Provides guidance on the types of damage mechanisms commonly found in carbon steel equipment and the best inspection practices to detect them.

Covers various inspection techniques, including visual inspection (VT), ultrasonic testing (UT), magnetic particle testing (MT), and other Non-Destructive Examination (NDE) methods. Damage Mechanisms:

Addresses common issues like general thinning, localized corrosion, pitting, and environmental cracking (such as H2S-related cracking). Maintenance & Reliability:

It is often used in conjunction with other API standards like (Pressure Vessel Inspection) and

(Piping Inspection) to ensure the mechanical integrity of plant assets. Accessing the PDF API RP 586 , officially titled " NDT

As a copyrighted technical standard, the full PDF is not typically available for free. You can legally obtain it through the following official channels: API Publications Store: The primary source for purchasing the official document. Standards Subscriptions:

Many engineering firms provide access through subscriptions like IHS Markit or ASTM Compass. University Libraries:

If you are a student, your institution may have a license for the API standards database. damage mechanisms covered within this document? AI responses may include mistakes. Learn more

This is a good report structure for the topic: “API RP 586: Technical Report on Pipe Flange Leakage” (formally API Recommended Practice 586).

Since you specified “API RP 586 PDF,” I have focused the report on what a professional would need to understand, locate, and apply this document.

3. Techstreet (Clarivate)

Techstreet is another authorized distributor offering the PDF with advanced features like:

Cross-referencing links to other standards (ASTM, NACE, ISO).
Printable and searchable watermarked PDFs.
Multi-user access for engineering teams.

Q4: Does API RP 586 apply to LPG or cryogenic liquids?

A: Partially. For high-vapor-pressure liquids (LPG, butane, propane), RP 586 recommends using pressurized sample cylinders and chilling. But you may also need GPA 2174 (for LPG sampling) as a supplement.

3.3 Risk Matrices

A key output of the API RP 586 methodology is the Risk Matrix. This visual tool plots POF against COF to categorize equipment into risk levels (e.g., Low, Medium, High, Extreme). This matrix allows decision-makers to prioritize resources effectively. Cross-referencing links to other standards (ASTM, NACE, ISO)

Why is API RP 586 Essential for HPHT and Subsea Applications?

High-Pressure High-Temperature (HPHT) environments—defined as pressures exceeding 15,000 psi and temperatures above 350°F (177°C)—push materials to their absolute limits. In these conditions, a minor deviation in alloy chemistry can lead to sulfide stress cracking (SSC), hydrogen-induced cracking (HIC), or ductile-to-brittle transition failures.

API RP 586 mandates that every critical component, from the wellhead housing down to a single lock screw, must be traceable back to its original melt. The "API RP 586 PDF" outlines the acceptance criteria for:

Composition verification (PMI tolerance levels).
Hardness testing (to prevent hydrogen embrittlement).
Record retention (typically 25+ years for subsea equipment).

Without adherence to this RP, operators face regulatory fines, forced shutdowns, and voided warranties from equipment manufacturers.

Common Non-Conformances (NCRs) Found During Audits

When third-party auditors (such as DNV, ABS, or Lloyds) inspect a facility for API Q1 or API 6A compliance, they frequently write NCRs related to API RP 586. The most common violations include:

1. Executive Summary

API RP 586 (Recommended Practice 586) provides standardized methodology to evaluate leakage rates from bolted pipe flanges. Unlike traditional flange design (ASME BPVC Section VIII) which focuses on mechanical strength, API RP 86 addresses emissions control — critical for refinery, petrochemical, and natural gas facilities subject to fugitive emission regulations (e.g., EPA Method 21, LDAR programs).

Key output: This report helps engineers specify gaskets, bolt loads, and flange finishes to achieve a quantifiable leak rate (e.g., ≤ 10⁻⁵ mg/sec/mm of flange OD).

How does API RP 586 relate to ISO 3171?

ISO 3171 (Automatic Pipeline Sampling) is an international standard. API RP 586 is more focused on refinery and terminal situations where sample system retrofits, safety hazards, and operator training require practical, local guidance. Both are complementary; many engineers use ISO 3171 for fundamental math (e.g., determining sample cycle intervals) and RP 586 for the mechanical design and safety implementation.

What is API RP 586?

API RP 586 is a recommended practice published by the American Petroleum Institute (API). Its full title is: "API Recommended Practice 586: Technical Report on Material Traceability and Identification for Subsea and High-Pressure High-Temperature (HPHT) Equipment."

It is important to note a frequent source of confusion: API RP 586 is technically identical to API 17TR2 (Technical Report 2). In 2015, the API renumbered several subsea documents. What was once API 17TR2 is now API RP 586. Therefore, when you search for an "API RP 586 PDF," you are also searching for the latest edition of the 17TR2 guidelines.