API 510 Chapter 15 – NDE Requirements of API 510 and API RP 577

Step 1: variable table

Prepare for the API 510 Pressure Vessel Inspector certification exam with this API 510 Chapter 15 NDE Requirements study guide and free practice test.

Nondestructive Examination, commonly abbreviated NDE, is one of the most important areas of pressure-vessel inspection. An API 510 inspector must understand not only the major NDE methods, but also which method is suitable for a particular damage mechanism, what each method can detect, and what its limitations are.

This chapter focuses on NDE requirements and principles associated with:

• API 510

• API RP 577

• ASME Section V

• ASME Section VIII Division 1

Important examination topics include:

• Visual examination

• Radiographic Testing – RT

• Liquid Penetrant Testing – PT

• Magnetic Particle Testing – MT

• Ultrasonic thickness measurement – UT

• NDE procedures

• Calibration

• Examination techniques

• Interpretation

• Documentation

• Recordkeeping

• Image Quality Indicators

• Radiographic density

• Backscatter

• Location markers

• Yoke and prod MT techniques

• Surface preparation

• Discontinuity versus defect

• Selection of NDE based on damage mechanism

After reviewing these topics, take the free API 510 Chapter 15 Practice Test to check your understanding.

Step 1 – API 510 NDE Method Comparison Table

Use this table as a quick revision guide before attempting the practice questions.

NDE Method	Best Used For	Typical Detectable Conditions	Important Limitation
VT – Visual Testing	Surface condition and general inspection	Corrosion, distortion, leakage, weld profile, visible cracks	Cannot reliably detect hidden subsurface damage
PT – Liquid Penetrant Testing	Surface-breaking discontinuities	Fine surface cracks, laps, porosity open to surface	Discontinuity must be open to the surface
MT – Magnetic Particle Testing	Surface and near-surface discontinuities	Cracks and other discontinuities in ferromagnetic materials	Limited to suitable ferromagnetic materials
RT – Radiographic Testing	Internal weld examination	Porosity, slag, some lack of penetration and fusion	Planar defects can be difficult to detect when poorly oriented
UT Thickness	Remaining wall thickness	General/local wall loss and corrosion thickness	Spot readings can miss localized deterioration
Specialized UT	Internal/planar damage	Cracks, laminations, and internal flaws depending on technique	Technique and operator dependent

The most important exam principle is:

Choose the NDE method based on the damage mechanism and type of discontinuity you are trying to detect.

What Is Nondestructive Examination?

Nondestructive Examination is the examination of a material, component, or weld without destroying its future usefulness.

NDE methods allow inspectors to obtain information about:

• Surface condition

• Wall thickness

• Weld quality

• Cracking

• Corrosion

• Internal discontinuities

• Material deterioration

Different NDE methods use different physical principles.

No single NDE method can reliably detect every type of damage.

Therefore, effective inspection often requires combining:

Damage-mechanism knowledge + correct NDE method + proper examination technique

Why NDE Is Important for API 510

Pressure vessels can deteriorate through mechanisms such as:

• General corrosion

• Localized corrosion

• Pitting

• Erosion

• Corrosion Under Insulation

• Stress corrosion cracking

• Hydrogen damage

• Fatigue

• Weld cracking

• High-temperature damage

Some conditions can be detected visually.

Others require specialized examination.

For example:

General corrosion

may be evaluated using ultrasonic thickness measurements.

Surface cracking

may require MT or PT.

Internal weld discontinuities

may require RT or UT.

Selecting the wrong technique can result in serious damage remaining undetected.

API 510 NDE Requirements

API 510 requires inspection methods to be appropriate for the condition being evaluated.

An inspector should consider:

• Expected damage mechanism

• Equipment material

• Damage location

• Defect orientation

• Accessibility

• Surface condition

• Vessel geometry

• Previous inspection results

• NDE effectiveness

• Required examination sensitivity

Inspection should therefore be damage-mechanism driven rather than simply selecting whichever NDE method is easiest to perform.

API RP 577 and NDE

API RP 577 connects welding inspection with commonly used NDE methods.

A welding inspector should understand how different weld discontinuities may be detected.

Examples include:

Porosity

Often detected effectively by radiography.

Slag inclusions

May be visible by RT depending on size and orientation.

Surface cracks

Can often be detected by MT or PT.

Lack of fusion

May require appropriate RT or UT techniques depending on orientation and geometry.

Incomplete penetration

May be detectable using radiography or ultrasonic techniques in suitable configurations.

Understanding the discontinuity helps determine the most suitable examination method.

ASME Section V and API 510

ASME Section V provides rules and methods for nondestructive examination.

For the current API 510 examination scope, important Section V areas include:

• Article 1 – General Requirements

• Article 2 – Radiographic Examination

• Article 6 – Liquid Penetrant Examination

• Article 7 – Magnetic Particle Examination

• Article 23, SE-797 – Manual Ultrasonic Thickness Measurement

An important concept is:

ASME Section V generally tells you how to perform the examination.

The referenced construction or inspection Code determines when examination is required and what acceptance criteria apply.

This distinction is particularly important when working with ASME Section VIII.

ASME Section V Article 1 – General Requirements

Article 1 provides general requirements applicable to Section V examinations.

API 510 candidates should understand topics such as:

• Scope

• Referencing Code requirements

• Responsibilities

• Written procedures

• Calibration

• Examination

• Documentation

• Recordkeeping

Inspection vs Examination

These terms should not automatically be treated as identical.

Examination generally refers to activities performed using specific NDE techniques to obtain information about the condition of material or components.

Inspection is broader and can involve reviewing examination results, Code compliance, condition, documentation, and overall integrity.

An API Authorized Pressure Vessel Inspector may use results generated by qualified NDE personnel when making inspection decisions.

NDE Procedures

NDE should be performed using appropriate documented procedures when required.

A procedure can address items such as:

• Examination method

• Equipment

• Calibration

• Surface preparation

• Examination technique

• Coverage

• Interpretation

• Documentation

The purpose is to ensure that examinations are performed consistently and effectively.

Calibration

Calibration helps confirm that NDE equipment provides reliable results.

Calibration requirements depend on the examination method.

Examples include:

• UT thickness instrument calibration

• MT equipment checks

• Radiographic system requirements

• Reference standards

Do not confuse equipment calibration with acceptance criteria.

Calibration helps establish confidence in the measurement or examination system.

Visual Examination – VT

Visual examination is one of the most useful pressure-vessel inspection methods.

It can be used during:

• External inspection

• Internal inspection

• Welding inspection

• Repair inspection

• Pressure testing

• General condition assessment

Visual examination can reveal:

• General corrosion

• Pitting

• Leakage

• Distortion

• Bulging

• Weld-profile problems

• Undercut

• Mechanical damage

• Damaged insulation

• Coating deterioration

• Support damage

Advantages of Visual Examination

VT is:

• Fast

• Relatively inexpensive

• Widely applicable

• Useful for large areas

• Effective as a first inspection method

A skilled visual inspection can identify areas requiring additional NDE.

Limitations of Visual Examination

Visual examination generally cannot reliably detect:

• Internal weld defects

• Subsurface cracking

• Hidden corrosion beneath insulation

• Internal laminations

• Small cracks not visible at the surface

Therefore:

VT should often guide additional NDE rather than replace it.

ASME Section V Article 2 – Radiographic Examination

Radiographic Testing uses penetrating radiation to create an image based on differences in material thickness and density.

Radiation may be produced by sources such as:

• X-ray equipment

• Gamma-ray sources

The radiation passes through the component and produces an image on a detector.

Areas that absorb different amounts of radiation appear differently in the resulting image.

What Can Radiography Detect?

RT can be particularly effective for volumetric weld discontinuities such as:

• Porosity

• Slag inclusions

• Certain incomplete-penetration conditions

• Certain fusion imperfections

It can provide a permanent examination record when images are appropriately retained.

RT and Defect Orientation

A very important concept is:

Radiographic detectability depends on defect orientation relative to the radiation beam.

Volumetric discontinuities such as rounded porosity usually cause measurable thickness/density differences regardless of orientation.

Planar defects such as:

• Cracks

• Lack of fusion

can be much more difficult to detect if they are not favorably aligned with the radiation beam.

Therefore, RT is not automatically the best method for every weld defect.

Radiographic Image Density

Traditional radiographic film density relates to the degree of film darkening caused by radiation exposure.

Density must fall within the applicable examination requirements.

Incorrect density can make interpretation difficult or prevent the radiograph from meeting examination requirements.

Candidates should understand the general role of:

• Exposure

• Material thickness

• Source

• Film/detector response

• Density requirements

Image Quality Indicators – IQIs

An Image Quality Indicator, or IQI, provides evidence of radiographic image quality and examination sensitivity.

Common forms include:

• Wire-type IQIs

• Hole-type IQIs

IQI requirements can involve:

• Selection

• Placement

• Number

• Identification

• Visibility

The purpose of an IQI is not to reproduce a defect.

It demonstrates that the radiographic technique has achieved the required image quality.

Source-Side Placement

Where practical and required by the applicable technique, the IQI is normally positioned in the location specified by the Code to demonstrate appropriate examination sensitivity.

Candidates should understand that IQI placement matters because geometric arrangement affects image quality.

Location Markers

Radiographs require appropriate location identification so indications can be related to actual locations on the pressure vessel or weld.

Without reliable location markers, an indication may be difficult to locate for:

• Repair

• Re-examination

• Documentation

Backscatter Radiation

Backscatter occurs when radiation passes through the object and is scattered back toward the detector from surrounding surfaces.

Excessive backscatter can degrade image quality.

Radiographic procedures therefore contain requirements for detecting and controlling backscatter.

Radiographic Records

Documentation can include:

• Equipment identification

• Weld identification

• Radiograph location

• Technique

• IQI information

• Interpretation

• Examination results

• Examiner information

• Date

Accurate records are essential when radiographs are used to support vessel acceptance or repair decisions.

Liquid Penetrant Testing – PT

Liquid Penetrant Testing detects surface-breaking discontinuities in suitable nonporous materials.

The process relies on liquid penetrating into a discontinuity open to the surface.

After excess penetrant is removed, developer helps draw penetrant from the discontinuity and creates a visible indication.

Basic PT Steps

A typical PT sequence includes:

1. Surface preparation

The surface must be appropriately clean and suitable for examination.

2. Penetrant application

Penetrant is applied to the examination surface.

3. Penetrant dwell

Time is allowed for penetrant to enter surface openings.

4. Excess penetrant removal

Excess penetrant is removed without improperly removing penetrant from discontinuities.

5. Developer application

Developer draws penetrant back to the surface and improves indication visibility.

6. Examination and interpretation

Indications are evaluated.

7. Post-cleaning

Cleaning may be required following the examination.

PT Techniques

Penetrant systems can include different techniques and materials.

Candidates should understand that procedure requirements can vary with:

• Penetrant type

• Removal method

• Developer

• Lighting conditions

The examination procedure should match the selected penetrant system.

What Can PT Detect?

PT is useful for surface-breaking conditions such as:

• Fine cracks

• Surface porosity

• Laps

• Seams

• Other open-to-surface discontinuities

PT Material Applications

Unlike MT, PT does not require ferromagnetic material.

It can therefore be useful on suitable materials such as:

• Carbon steel

• Stainless steel

• Nickel alloys

• Other nonporous metallic materials

However, the examined surface must be suitable for penetrant examination.

PT Limitations

PT cannot detect:

• Completely subsurface flaws

• Internal discontinuities with no surface opening

Surface condition is also very important.

Paint, scale, oil, grease, dirt, or other contamination can interfere with penetrant entry.

PT Indications

Candidates should distinguish:

Relevant indications

from

Nonrelevant or false indications

An indication does not automatically mean there is a rejectable defect.

It must be interpreted and evaluated against the applicable acceptance criteria.

Magnetic Particle Testing – MT

Magnetic Particle Testing is used to detect surface and near-surface discontinuities in ferromagnetic materials.

The component is magnetized.

If a discontinuity interrupts the magnetic field, magnetic flux can leak from the surface.

Fine magnetic particles accumulate in the leakage field and form an indication.

What Can MT Detect?

MT is particularly effective for detecting:

• Surface cracks

• Near-surface cracks

• Weld-toe cracking

• HAZ cracking

• Fatigue cracks

• Other suitable discontinuities

Ferromagnetic Materials

MT requires a suitable ferromagnetic material.

Common carbon and low-alloy steels are generally suitable.

Many austenitic stainless steels are not suitable for conventional MT.

For nonmagnetic materials, PT may be a better surface-crack examination method.

MT Yoke Technique

The yoke technique uses an electromagnetic or permanent magnet yoke to create a magnetic field in the examination area.

The yoke is placed on the surface and magnetic particles are applied.

Yokes are widely used for:

• Weld examination

• Repair inspection

• Local surface-crack detection

MT Prod Technique

The prod technique uses electrical contacts placed directly against the test surface.

Current flows between the prods and creates a magnetic field around the current path.

Because prods make electrical contact with the examination surface, the technique requires appropriate control to prevent surface damage such as arc burns.

For the current API 510 exam, the detailed Article 7 scope specifically includes yoke and prod techniques.

Magnetic Field Direction

MT is most effective when the discontinuity crosses the magnetic field at a favorable angle.

A crack oriented nearly parallel to the field may produce a weak indication.

Therefore, examinations may require magnetization in more than one direction.

This is a fundamental MT principle.

Visible vs Fluorescent Magnetic Particles

MT can use:

• Visible particles

• Fluorescent particles

Fluorescent particles are examined under appropriate ultraviolet-A lighting conditions.

The technique selected should follow the examination procedure.

MT Limitations

MT is limited because:

• The material must be ferromagnetic.

• Detectability depends on flaw orientation.

• Surface condition can affect examination.

• Geometry can interfere with magnetic-field distribution.

PT vs MT

This is a common exam comparison.

PT

• Surface-breaking discontinuities only

• Can be used on many nonporous materials

• Requires penetrant dwell and developer

• Not limited to ferromagnetic material

MT

• Surface and certain near-surface discontinuities

• Requires ferromagnetic material

• Uses magnetic field and particles

• Highly effective for cracking in suitable steels

A good exam rule is:

Austenitic stainless steel surface crack → think PT

Carbon-steel surface/near-surface crack → MT may be especially useful

Always confirm the specific examination requirement.

Ultrasonic Testing – UT

Ultrasonic examination uses high-frequency sound waves to obtain information about material thickness or internal condition.

For the current API 510 examination, the ASME Section V ultrasonic scope specifically includes SE-797 manual pulse-echo contact ultrasonic thickness measurement.

Thickness measurement is particularly important for pressure-vessel inspection.

How UT Thickness Measurement Works

A transducer sends an ultrasonic pulse into the material.

The sound travels through the material and reflects from the opposite surface.

The instrument measures the sound travel time.

Using the material’s acoustic velocity, the instrument calculates thickness.

Conceptually:

Thickness = Sound Velocity × Travel Time / 2

The division by two accounts for the sound traveling to the back wall and returning to the transducer.

Couplant

A couplant is placed between the UT probe and the material surface.

Its purpose is to eliminate the air gap and help transmit ultrasonic energy from the probe into the material.

Common couplants can include suitable gels or liquids.

Without adequate coupling, reliable thickness measurement may not be possible.

UT Thickness Applications

Ultrasonic thickness measurement can be used to monitor:

• General corrosion

• Wall thinning

• Erosion

• Remaining wall thickness

• Condition Monitoring Locations

Measurements can then support calculations involving:

• Corrosion rate

• Remaining life

• Inspection interval

• Fitness for continued service

UT Calibration

The UT instrument should be appropriately calibrated for the measurement being performed.

Factors can include:

• Material acoustic velocity

• Probe

• Reference standard

• Thickness range

• Temperature where relevant

Incorrect calibration can produce inaccurate thickness results and therefore incorrect remaining-life calculations.

UT Surface Condition

Surface condition can affect measurement quality.

Problems can include:

• Heavy scale

• Rough corrosion

• Coatings

• Curved surfaces

• Poor probe contact

The inspector or examiner should understand the limitations of the measurement and verify suspicious readings where appropriate.

Spot UT vs Scanning

A single thickness measurement represents only one small location.

This is particularly important for localized corrosion.

If damage is highly localized, widely spaced spot readings can completely miss the thinnest area.

Therefore, inspection may require:

• Additional measurements

• Grid mapping

• UT scanning

• Other appropriate corrosion mapping techniques

UT Measurement Repeatability

For corrosion-rate calculations, repeat measurements should be taken in a consistent manner whenever practical.

Factors affecting repeatability include:

• Exact measurement location

• Probe orientation

• Surface preparation

• Instrument calibration

• Operator technique

Good CML records help future inspectors compare measurements reliably.

NDE Selection by Damage Mechanism

The inspection method should match the expected form of deterioration.

General Corrosion

Common approach:

• VT

• UT thickness measurement

Localized Corrosion

Possible approach:

• VT

• UT scanning or thickness mapping

Surface Cracking in Carbon Steel

Possible approach:

• MT

• PT where appropriate

Surface Cracking in Austenitic Stainless Steel

Possible approach:

• PT

Internal Weld Volumetric Discontinuities

Possible approach:

• RT

• Appropriate UT techniques

Corrosion Under Insulation

Possible approach:

• Targeted insulation removal

• VT

• UT

• Other suitable screening/examination methods

HTHA or Complex Internal Damage

May require specialized advanced ultrasonic or other techniques beyond simple spot thickness measurement.

The key lesson is:

Damage type determines inspection technique.

NDE Method vs Acceptance Criteria

This distinction is extremely important.

An NDE method tells you how to examine.

Acceptance criteria tell you whether an indication is acceptable.

For example:

ASME Section V may tell you how to perform PT.

The referenced Code establishes the acceptance criteria applicable to the pressure-vessel weld or component.

Do not automatically search Section V for every reject/accept decision.

Relevant Indication vs Defect

A useful distinction is:

Indication

Evidence produced by an NDE examination that requires interpretation.

Discontinuity

An interruption in the normal physical structure of material or weld.

Defect

A discontinuity that exceeds the applicable acceptance criteria and is therefore rejectable.

Not every NDE indication is a defect.

This distinction is particularly important in PT, MT, RT, and UT interpretation questions.

Linear vs Rounded Indications

Some Code acceptance criteria distinguish between:

Linear indications

and

Rounded indications

Linear indications can be associated with crack-like or elongated discontinuities.

Rounded indications can be associated with conditions such as porosity.

Their significance and acceptability depend on the applicable Code criteria.

Do not decide acceptance based simply on whether an indication is visible.

NDE After Weld Repairs

When an unacceptable weld defect is repaired, inspection should verify the completed repair as required.

The process can include:

1. Locate the defect.

2. Remove the defective material.

3. Confirm adequate defect removal where required.

4. Perform repair welding using an appropriate qualified WPS.

5. Perform the required NDE.

6. Evaluate the repaired area against applicable acceptance criteria.

7. Document the result.

Repair should address the actual defect rather than simply making the original NDE indication disappear.

NDE and API 510 Repairs and Alterations

API 510 repair and alteration work may require examination methods based on:

• Repair type

• Weld configuration

• Material

• Service

• Damage mechanism

• Original Code requirements

• Engineering assessment

Possible examinations include:

• VT

• PT

• MT

• RT

• UT

An Authorized Pressure Vessel Inspector should understand why a particular method is being specified.

NDE in Lieu of Pressure Testing

In certain carefully evaluated repair situations, applicable rules may permit specified NDE to be used instead of a pressure test when all required conditions are satisfied.

This is not simply an inspector’s informal choice.

The current API 510 examination reference list includes ASME PCC-2 Article 502 – Nondestructive Examination in Lieu of Pressure Testing for Repairs and Alterations.

Candidates should understand the general principle that substitute NDE must be appropriately engineered and satisfy the applicable repair requirements.

API 510 NDE Exam Scope

For the current API 510 exam cycle, candidates should concentrate on the following ASME Section V topics:

Article 1 – General Requirements

Study:

• Scope

• Referencing Code

• Responsibilities

• Calibration

• Examination terminology

• Records

Article 2 – Radiographic Examination

Study:

• General RT requirements

• Marking

• IQI selection and placement

• Density

• Backscatter

• Location markers

• Records

Article 6 – Liquid Penetrant Examination

Study:

• Procedures

• Contaminants

• Techniques

• Examination

• Interpretation

• Documentation

• Records

Article 7 – Magnetic Particle Examination

Focus on:

• Yoke technique

• Prod technique

• Procedures

• Calibration

• Examination

• Interpretation

• Documentation

Article 23 / SE-797 – Ultrasonic Thickness Measurement

Study:

• Scope

• General ultrasonic principles

• Manual pulse-echo contact thickness measurement

• Measurement procedures

API 510 NDE Quick-Decision Table

Situation	Useful First NDE Consideration
Visible vessel corrosion	VT
Need accurate remaining wall thickness	UT
Fine surface crack in carbon steel	MT
Fine surface crack in nonmagnetic stainless steel	PT
Internal weld porosity	RT
Localized corrosion	UT mapping/scanning
Weld crack	MT/PT or appropriate UT depending on situation
Suspected internal planar flaw	Appropriate UT technique
General external vessel condition	VT
Condition beneath insulation	Targeted access + suitable NDE

The final inspection method should always consider material, geometry, damage orientation, accessibility, and applicable Code requirements.

Common API 510 NDE Exam Mistakes

Assuming RT Detects Every Weld Defect

Planar defects can be difficult to detect when unfavorably oriented.

Using MT on Any Material

MT requires suitable ferromagnetic material.

Assuming PT Detects Subsurface Cracks

PT detects discontinuities open to the examined surface.

Treating One UT Reading as Representative of an Entire Vessel

Localized thinning can exist between spot readings.

Confusing IQI With a Defect Standard

An IQI demonstrates radiographic image quality. It is not intended to imitate every possible weld defect.

Looking Only in ASME Section V for Acceptance Criteria

Section V primarily addresses NDE methodology. The referencing construction or inspection Code normally establishes applicable acceptance criteria.

Confusing an Indication With a Defect

An indication requires interpretation. A discontinuity becomes a defect when it exceeds the applicable acceptance requirements.

Ignoring Surface Preparation

Poor preparation can significantly reduce the effectiveness of PT, MT, VT, and UT.

Ignoring Damage Orientation

Orientation affects the detectability of cracks and other planar discontinuities.

Selecting NDE Before Identifying the Damage Mechanism

Start with:

What damage am I trying to find?

Then select the method.

How to Solve API 510 NDE Questions

Use this sequence.

Step 1 – Identify the Damage

Is it:

• Wall thinning?

• Surface crack?

• Subsurface crack?

• Porosity?

• Slag?

• Localized corrosion?

Step 2 – Identify the Material

Is it:

• Carbon steel?

• Low-alloy steel?

• Austenitic stainless steel?

• Another alloy?

Step 3 – Determine Damage Location

Is it:

• Surface?

• Near surface?

• Through thickness?

• Internal?

• Hidden beneath insulation?

Step 4 – Select the NDE Method

Choose a method capable of detecting the expected damage.

Step 5 – Check Technique Limitations

Ask what the method could miss.

Step 6 – Apply the Referencing Code

Determine the applicable acceptance requirements.

A useful memory sequence is:

Damage → Material → Location → NDE Method → Limitation → Acceptance

Take the Free API 510 Chapter 15 Practice Test

Take this free API 510 Chapter 15 NDE Requirements Practice Test and check your understanding of nondestructive examination requirements in API 510, API RP 577, and ASME Section V.

Practice questions can cover:

• Visual examination

• RT

• PT

• MT

• UT

• IQIs

• Radiographic density

• Backscatter

• Location markers

• Penetrant techniques

• MT yoke technique

• MT prod technique

• Ferromagnetic materials

• Ultrasonic thickness measurement

• Calibration

• NDE records

• Damage mechanism selection

• Weld discontinuities

• Examination versus acceptance

Attempt each question before looking at the answer.

For every incorrect answer, identify:

What damage was being sought?

Which method was selected?

Why was another method more appropriate?

This is much more useful than simply memorizing the correct option.

Current API 510 NDE References

For the September 2026, January 2027, and May 2027 API 510 exam cycle, the applicable references include:

API 510
Pressure Vessel Inspection Code – 11th Edition, October 2022, with applicable errata.

API RP 577
Welding Processes, Inspection, and Metallurgy – 3rd Edition, October 2020, with applicable errata.

ASME BPVC Section V
2025 Edition, with examination coverage including Articles 1, 2, 6, 7 and Article 23/SE-797 as specified by API.

ASME Section VIII Division 1
Selected portions dealing with pressure-vessel construction and NDE requirements.

Candidates should always check the official API Publications Effectivity Sheet applicable to their individual examination date because Code editions and examination scope may change.

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API 510 Question Bank – 5,000+ Practice Questions

Practice areas include:

• API 510

• Nondestructive Examination

• ASME Section V

• API RP 577

• Visual inspection

• Radiographic Testing

• Liquid Penetrant Testing

• Magnetic Particle Testing

• Ultrasonic Testing

• Thickness measurement

• Welding inspection

• Weld discontinuities

• ASME Section VIII

• ASME Section IX

• API RP 571 damage mechanisms

• API RP 572 inspection practices

• API RP 576 pressure-relieving devices

• Welding qualifications

• PWHT

• Impact testing

• Pressure-vessel calculations

• Corrosion rate

• Remaining life

• MAWP

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• Repairs

• Alterations

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Use the UpWeld learning package as a practice and revision resource together with the official API, ASME, and other examination references applicable to your exam date.

UpWeld questions are independently developed educational practice questions. They are not official API examination questions, and no particular practice question can be guaranteed to appear on the API 510 certification examination.

Continue Your API 510 Exam Preparation

After completing the API 510 Chapter 15 NDE Requirements Practice Test, review every incorrect answer using the applicable examination references.

For every NDE scenario, ask:

What damage am I looking for?

Is it surface or internal?

What material is being examined?

Which NDE method can detect it?

What are that method’s limitations?

Which Code establishes acceptance?

A strong revision sequence is:

Damage Mechanism → Material → Location → NDE Method → Technique → Limitation → Interpretation → Acceptance → Documentation

Once you learn to choose NDE methods based on the expected damage rather than memorizing isolated facts, API 510 NDE questions become much easier to solve.

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API, API 510, API RP 577, ASME, ASME BPVC Section V, and related publication names belong to their respective owners.

UpWeld practice questions are independently developed for educational purposes and are not official API examination questions. Examination references, editions, and requirements may change. Always verify the official API 510 Body of Knowledge and Publications Effectivity Sheet for your examination date.

Click here to read the next API 510 Exam Chapter 16- The NDE Requirements of ASME V