API 1163 In-Line Inspection Systems Qualification

API 1163 is the standard for qualifying in-line inspection (ILI) tools and processes for hazardous-liquid and gas pipelines, defining tool performance specifications, dig verification programs, and reporting requirements.

Definition

API 1163 ensures that ILI vendor performance claims (detection threshold, sizing accuracy, location accuracy) are demonstrated through pull-test verification or in-line dig validation. ILI runs every 5–10 years are required by US PHMSA for high-consequence areas.

What this document is

The API standard for in-line inspection system qualification, defining how ILI system performance — detection, identification, sizing and location — is validated against stated specifications.

How it is applied

It shifts the conversation from vendor claims to demonstrated performance, requiring the tool, procedures and personnel to be qualified as a system and results to be validated against field verification digs.

The common misuse

Accepting a tool specification as achieved performance. The standard exists because unvalidated tolerance claims lead directly to wrong dig decisions.

Where API 1163 In-Line Inspection Systems Qualification fits in an inspection programme

A term is only useful when it connects to a decision. API 1163 In-Line Inspection Systems Qualification appears in written procedures, in technique sheets, and in the records an owner or accreditation body reviews afterwards — which means the way it is defined in your documentation has to match the way it is applied on site. Where the two drift apart, audits find it. Atlantis writes and reviews procedures against the governing codes, trains inspection personnel to apply them, and builds the record-keeping that makes the evidence retrievable years later. Procedure development and code consulting · NDT training and certification · Ask us about your programme.

Related terms

Magnetic Flux Leakage (MFL) — MFL is an electromagnetic NDT method that magnetizes a ferromagnetic component to saturation and detects flux leakage at metal-loss features using Hall-effect or coil sensors, widely used for tank-floor and pipeline pig inspection.
ASME B31.8 Gas Transmission and Distribution Piping — ASME B31.8 is the code for gas transmission and distribution piping systems, including pipelines and onshore station piping, defining NDT, hydrostatic testing, and integrity management for natural gas service.
ASME B31.4 Liquid Pipelines — ASME B31.4 is the code for transportation of liquids by pipelines, including crude oil, refined petroleum products, liquid alcohols, ammonia, and CO2, defining weld NDT requirements integrated with API 1104.

More standard terms

ASME Section V · ASME Section VIII · ASME Section IX · ASME Section XI · ASME B31.1 Power Piping · ASME B31.3 Process Piping · API 510 Pressure Vessel Inspection Code · API 570 Piping Inspection Code · API 571 Damage Mechanisms · API 579-1 / ASME FFS-1 Fitness-for-Service

Where this comes up in practice

Terms like this one appear in three places that matter commercially: the written practice that governs how your personnel are qualified, the procedures and technique sheets that define how an examination is actually performed, and the evidence an auditor or client asks for when they want to know why an inspection was accepted. Getting the terminology right is the easy part; being able to produce the qualification record, the calibration traceability and the procedure revision that applied on the day of the inspection is the part that decides audits.

Atlantis NDT provides NDT training and certification against ASNT SNT-TC-1A and ISO 9712, ASNT Level III consulting for written practices and procedure approval, inspection management software that holds qualification, calibration and procedure-revision evidence in recoverable form, and an asset integrity platform that binds inspection results to the asset they describe. Browse the full NDT glossary or ask a Level III directly.