ASME Section V: Nondestructive Examination
Comprehensive standard covering all nondestructive examination methods including ultrasonic, radiographic, magnetic particle, penetrant, eddy current, and visual testing. ASME Section V is the most widely referenced NDT standard in North America for pressure vessels, power generation equipment, and industrial applications. It specifies procedure requirements, acceptance criteria, and personnel qualification standards.
The American Society of Mechanical Engineers (ASME) writes the boiler, pressure vessel, and piping codes that almost every U.S. jurisdiction has adopted by reference into law.
For pressure equipment built or operated in the United States, ASME compliance is rarely optional — state boiler-and-pressure-vessel inspectors enforce it directly.
ASME Section V is invoked when the scope of work matches its title — nondestructive examination — and when the contract or regulatory regime cites it as the controlling document. In power and nuclear work, the inspection plan is built directly off the standard's tables; an auditor will cite the paragraph that was followed (or the one that was missed) when writing a finding. On petroleum and petrochemical equipment, ASME Section V usually feeds into a written mechanical-integrity program: inspection intervals, examination methods, and acceptance criteria are all traced back to a clause number in the document. In fabrication shops the standard is reproduced inside the written procedure book and referenced from every inspection report so that the auditor's paper trail leads back to the same paragraph the inspector worked from.
Methods covered
Industries
- Power Generation
- Oil & Gas
- Petrochemical
- Manufacturing
- Personnel qualification: examinations under ASME Section V must be performed by inspectors qualified and certified to a recognised scheme (typically ASNT SNT-TC-1A, CP-189, or ISO 9712 depending on jurisdiction), with documented training hours, vision tests, and a controlling written practice.
- Written procedure: every examination requires a written, controlled procedure that names the method, equipment, calibration steps, scanning pattern, and acceptance criteria — and is qualified before first use.
- Equipment verification: ultrasonic instruments must be verified against a calibration block (V1, V2, IIW, or job-specific reference) at intervals defined by the procedure — typically before use, every four hours of scanning, on operator change, and at end of shift.
- Image-quality verification: every radiograph or digital exposure carries a penetrameter / IQI of the type and thickness specified by the standard; the IQI must be visible and at the required sensitivity for the radiograph to be acceptable.
- Radiation safety: source handling, exclusion zones, dosimetry, and source recordkeeping must follow the licensing authority's rules in addition to the inspection standard itself.
- Magnetic-particle technique: magnetisation method (yoke, prods, central conductor, multidirectional), field strength verification (pie gauge, Hall-effect meter, or QQI), and demagnetisation are all specified in the written procedure.
- Penetrant process control: penetrant family (visible / fluorescent), sensitivity level, dwell times, removal method (solvent / lipophilic / hydrophilic), and developer type are all controlled and documented for each examination.
- Eddy-current setup: probe selection, frequency, gain, and reference-standard calibration must be documented and verified against a reference standard with known artificial flaws prior to inspection.
- Acceptance criteria: indications are evaluated against the standard's tabulated limits (length, depth, alignment, frequency); any indication exceeding the criteria is recorded, dispositioned, and either repaired or evaluated for fitness-for-service.
- Documentation: examination reports must include enough information for a third party to reproduce the inspection — equipment serial numbers, calibration records, inspector ID, sketches of indications, and the controlling procedure revision.
- Code reference and edition: the ASME edition in force at the time of construction (or as amended by jurisdictional adoption) controls the rules; inspection records must cite the edition and addenda that were applied.
- Latest Edition
- 2023
- First Published
- 1968
- Scope
- Defines the NDE methods (RT, UT, MT, PT, ET, VT, LT, AE) used by every other ASME construction code; written-procedure + qualified-personnel framework.
- Acceptance Criteria
- None — Section V contains *examination* requirements only; acceptance lives in the construction code (I, III, VIII, XI, B31.x) that invokes it.
- Calibration / Qualification
- Procedure qualification per T-150; personnel qualified to a written practice (typically SNT-TC-1A or CP-189); equipment verified per the article's calibration table.
Key Clauses Inspectors Cite
- Article 1 — General Requirements (procedure qualification, personnel)
- Article 2 — Radiographic Examination
- Article 4 — Ultrasonic Examination of Welds
- Article 4 Mandatory Appendix III — TOFD
- Article 4 Mandatory Appendix VIII — PAUT
- Article 6 — Liquid Penetrant Examination
- Article 7 — Magnetic Particle Examination
- Article 8 — Eddy Current Examination
- Article 9 — Visual Examination
Companion / Parent Standards
ASME BPVC Section I · ASME BPVC Section III · ASME BPVC Section VIII · ASME BPVC Section IX · ASME BPVC Section XI · ASME B31.1 · ASME B31.3
Sample Contract Language
“All NDE shall be performed in accordance with ASME BPVC Section V, latest edition, with acceptance criteria per ASME Section VIII Division 1, UW-51.”
ASME publishes a new edition of its codes on a fixed three-year cycle (with addenda and code cases issued between editions). Recent editions of ASME Section V have generally tightened personnel qualification language, expanded coverage of advanced ultrasonic methods (PAUT, TOFD) as accepted alternatives to radiography, and clarified the treatment of digital radiography and computed radiography. Inspection records should always cite the specific edition and addenda that were applied — codes are not retroactive, but new construction is always to the current edition unless a contract freezes an earlier one.
A typical refinery turnaround applies ASME Section V to the inspection scope for high-temperature piping and pressure vessels: corrosion-monitoring locations are read with UT thickness gauges, girth welds on repaired sections are radiographed or PAUT-scanned, and any indication outside the standard's acceptance table is dispositioned through API 579 fitness-for-service before the unit restarts.
What does ASME Section V cover?
ASME Section V (Nondestructive Examination) is published by ASME (American Society of Mechanical Engineers). Comprehensive standard covering all nondestructive examination methods including ultrasonic, radiographic, magnetic particle, penetrant, eddy current, and visual testing.
What is the history of ASME Section V and the most common misuse to avoid?
ASME Section V was first issued in 1971 as the consolidated NDE umbrella for the Boiler & Pressure Vessel Code; it merged what had been scattered method-specific paragraphs across Sections I, III, and VIII into a single Article-1-through-Article-31 compendium. The Article numbering has been remarkably stable since — Article 4 (UT), Article 6 (PT), Article 7 (MT), and Article 23 (RT digital) are the workhorses cited in 80%+ of US pressure-equipment procedures. The most common Section V mistake is treating it as a self-contained standard. It is referenced FROM Sections I, III, VIII Div 1/2, and B31 piping codes — those parent sections specify WHEN to inspect; Section V specifies HOW. A procedure that cites only Section V without naming the parent code is incomplete and will fail an authorized-inspector review.
Which sister standards is ASME Section V typically used with?
ASME Section V is paired with Section IX (welding qualification) on every weld-NDT scope; for in-service work it pairs with the API in-service codes (510/570/653) that import Section V methods by reference.
Is ASME Section V mandatory or voluntary?
ASME Section V is a consensus standard. It becomes mandatory when invoked by a contract, by another code that cites it (for example ASME Section V calling out an ASTM practice), or by a regulator that has adopted it into law in a specific jurisdiction.
Who is qualified to perform inspections under ASME Section V?
Inspections under ASME Section V must be performed by personnel qualified and certified to a recognised NDT certification scheme — most commonly ASNT SNT-TC-1A or CP-189 in the United States, ISO 9712 in much of the rest of the world, and NAS 410 for aerospace work. The written practice that controls qualification must be in place before any examination is started.
Which edition of ASME Section V should I use?
New construction follows the edition of ASME Section V in force at the time the contract is signed (or the edition adopted by the controlling jurisdiction). In-service inspection generally follows the edition that was in force when the equipment was built, unless the operator's mechanical-integrity program adopts a later edition by reference.
Standard Code
ASME Section V
Organization
ASME (American Society of Mechanical Engineers)
Methods Covered
6 method(s)
Industries
4 sector(s)
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