API RP 574 – Inspection of Piping, Tubing, Valves, and Fittings

Systematically assess your piping inspection programme against API RP 574 — covering pipe circuit classification and prioritisation, inspector qualifications, inspection planning, corrosion under insulation (CUI) programme, injection point inspection, deadleg inspection, soil-to-air interface inspection, small-bore piping, NDE methods for piping, thickness measurement at CMLs, valve and fitting inspection, corrosion assessment, fitness-for-service, and inspection records management.

API RP 574 (4th Edition) Companion to API 570 CUI – Corrosion Under Insulation Injection Points & Deadlegs Valve & Fitting Inspection Auto-Save Enabled

Showing all API RP 574 inspection topics.

All piping components shown.

Overall Progress

✓ Compliant: 0 ~ Partial: 0 ✗ Gap: 0 — N/A: 0 ○ Not Assessed: 0

🔧 Inspector / Company & Piping System Details

Company / Operator Name

Assessed By

Assessment Date

Revision Number

Process Unit / System

Piping Circuit ID

Pipe Material

Circuit Class (API 570)

Insulation Present

API 570 Inspection Status

RBI Programme

Scope of Assessment

TOPIC: GeneralPlanning QualificationCircuit Class CUIInjection Pts DeadlegsSoil/Air Small-BoreNDE ThicknessValves FittingsCorrosion FFSRecords All Pipe Valves Fittings Instruments Exp.Joints

Piping Inspection Programme Report

Section compliance overview for API RP 574 Inspection of Piping, Tubing, Valves, and Fittings.

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ASSESSED BY
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DATE
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UNIT / SYSTEM
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CIRCUIT ID
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MATERIAL
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CIRCUIT CLASS
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INSULATION
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API 570 STATUS
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RBI
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SCOPE
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📊 Section Compliance Rate

🔴 Identified Gaps & Actions

ISO Xpert – Your API RP 574 Piping Inspection Partner

Expert piping inspection programme consulting — API RP 574 gap analysis, circuit classification, inspection plan development, CUI programme, injection point programme, NDE review, CML optimisation, and API 570 compliance support. Headquartered in London, serving clients globally.

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Last Updated: April 2025 | ISO Xpert Ltd

For legitimate internal piping inspection programme assessment only. Results are indicative. API RP 574 is the property of API. ISO Xpert Ltd is not affiliated with API. Governed by the laws of England and Wales.

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API RP 574 Inspection of Piping Tubing Valves Fittings — Frequently Asked Questions

Authoritative answers about API RP 574 Inspection of Piping Tubing Valves Fittings, inspection intervals, qualifications, RBI, and ISO Xpert consulting.

What is API RP 574?

API RP 574 is the American Petroleum Institute Recommended Practice for Inspection of Piping, Tubing, Valves, and Fittings. It is the companion inspection guidance document to API 570 (Piping Inspection Code), providing practical guidance on how to inspect piping systems, including pipe circuit classification, inspection methods for different piping components, NDE techniques, and specific guidance for high-risk areas such as injection points, deadlegs, and soil-to-air interfaces.

What are injection points and why are they critical in API RP 574?

Injection points are locations where chemicals, corrosion inhibitors, water, steam, or other substances are injected into a process stream. They are particularly susceptible to localised corrosion because the injected chemical may not be uniformly mixed with the process stream at the injection location, leading to high local concentrations, velocity effects, and phase changes. API RP 574 and API 570 require injection points to receive increased inspection frequency with thickness measurements extending both upstream and downstream of the injection nozzle.

What are deadlegs in piping and how should they be inspected?

Deadlegs are sections of piping that are out of service or have little or no flow. They can accumulate water, solids, or process condensate that concentrates corrosive species. In water-containing services, deadlegs can corrode from the inside even when the main active piping is protected by inhibitor flow. API RP 574 requires deadlegs to be identified in the inspection programme, with thickness measurements at the low-point and in areas where liquid accumulates or stagnation occurs.

How does CUI affect piping inspection per API RP 574?

Corrosion Under Insulation (CUI) is one of the most significant inspection challenges in process plant piping. Water ingress into the insulation — especially in temperature ranges favourable to corrosion (carbon steel: 10°C to 175°C) — can cause severe localised external corrosion of the pipe wall that is hidden under the insulation. API RP 574 requires a CUI inspection programme for all insulated piping, using methods such as pulsed eddy current (PEC), profile radiography, insulation removal with UT, or thermal inspection.

Can ISO Xpert help with API RP 574 piping inspection programme development?

Yes. ISO Xpert provides API RP 574 piping inspection programme gap analysis, circuit classification, inspection plan development, NDE programme review, CUI programme development, injection point programme development, and API 570 compliance support. Contact us at info@iso-xpert.com or call +44 7853 109840.

API RP 574 – Inspection of Piping, Tubing, Valves, and Fittings

🔧 Inspector / Company & Piping System Details

Piping Inspection Programme Report

ISO Xpert – Your API RP 574 Piping Inspection Partner

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API RP 574 Inspection of Piping Tubing Valves Fittings — Frequently Asked Questions

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