API 510 Chapter 17 – 30 Open-Book Sample Questions

Try these questions, using all of the codes specified in the API 510 exam ‘effectivity list’. There is little point in guessing the answers – the objective is to see where the answers come from in the codes, thereby increasing your familiarity with the content.

Prepare for the API 510 Pressure Vessel Inspector certification exam with this API 510 Chapter 17 Open-Book Practice Test featuring 30 open-book sample questions and answers.

The open-book portion of the API 510 exam is designed differently from the closed-book portion. It does not simply test what you can memorize. It tests whether you can:

• Identify the correct Code or Recommended Practice
• Locate detailed requirements efficiently
• Interpret Code language correctly
• Apply formulas and tables
• Compare several Code requirements
• Perform pressure-vessel calculations
• Determine inspection requirements
• Evaluate welding, NDE, repair, and material requirements
• Select the best answer from the options provided

This Chapter 17 practice test brings together subjects covered throughout the UpWeld API 510 study series and gives you an opportunity to practice realistic open-book Code navigation.

The current API 510 examination contains 60 open-book questions, while this UpWeld chapter provides a 30-question practice set that can be used as a focused half-length open-book simulation. API currently allows 3.75 hours for the 60-question open-book portion.

What Is the API 510 Open-Book Exam?

The API 510 examination is divided into two parts:

Of the 170 total questions, 140 are scored and 30 are unscored pretest questions. Candidates do not know which questions are pretest questions, so every question should be treated seriously. 

The open-book portion tests information that an inspector is expected to be able to find and apply from the applicable Code documents, even when that detail would not normally be memorized.

What References Are Available During the Open-Book Exam?

Candidates do not take their personal paper Codes, notes, books, or study guides into the testing center.

API states that the relevant Code and standard documents are made available electronically during the open-book examination, and only the portions identified for the examination are provided.

For the September 2026, January 2027, and May 2027 API 510 exam cycle, the official Effectivity Sheet includes the following references.

Always check the official API Effectivity Sheet for your own exam window because editions can change.

Why Open-Book Questions Can Be Difficult

Having the Code available does not necessarily make the open-book section easier.

The challenge is time.

A candidate who searches every Code document from the beginning for every question can quickly run out of time.

Open-book questions can require you to:

Find a requirement

and then

Interpret and apply it correctly.

For example, a question might provide:

• Vessel dimensions
• Actual thickness
• Corrosion allowance
• Joint efficiency
• Material allowable stress
• Design temperature

and ask for the vessel’s MAWP.

Finding the equation is only the first step. You must still identify the correct variables and perform the calculation correctly.

API 510 Open-Book Exam Strategy

A strong open-book strategy follows this sequence:

Question → Topic → Reference → Paragraph/Table/Figure → Apply → Verify

Do not begin by randomly searching every available document.

First identify what the question is actually testing.

For example:

Inspection interval question
Start with API 510.

Damage mechanism question
Think API RP 571.

Pressure-relief valve inspection question
Think API RP 576.

Welding process question
Think API RP 577.

Material verification/PMI question
Think API RP 578.

Pressure-vessel design equation
Think ASME Section VIII Division 1.

WPS/PQR/WPQ qualification
Think ASME Section IX.

NDE technique
Think ASME Section V.

Repair method
Think API 510 and possibly ASME PCC-2.

Building this reference map can save valuable examination time.

API 510 – Where to Look

API 510 is the central inspection Code.

Open-book questions may involve subjects such as:

• Inspection plans
• Inspection intervals
• Internal inspection
• On-stream inspection
• External inspection
• Thickness measurements
• Corrosion rates
• Remaining life
• MAWP
• Fitness-for-Service
• Repairs
• Alterations
• Rerating
• Pressure testing
• Pressure-relieving devices
• Records
• Inspector responsibilities

When a question concerns an existing pressure vessel in service, API 510 should usually be one of the first references you consider.

API RP 571 – Damage Mechanisms

API RP 571 is used for questions involving deterioration mechanisms.

For the current API 510 exam cycle, API includes Section 2 and 15 specified mechanisms, including:

• Amine SCC
• Atmospheric corrosion
• Boiler water and steam condensate corrosion
• Brittle fracture
• Caustic corrosion
• Caustic SCC
• Chloride SCC
• Corrosion Under Insulation
• Erosion/Erosion-corrosion
• High-temperature H₂/H₂S corrosion
• High-temperature hydrogen attack
• Hydrochloric acid corrosion
• Naphthenic acid corrosion
• Sulfidation
• Wet H₂S damage

The official Effectivity Sheet limits RP 571 coverage to these specified areas. American Petroleum Institute

For open-book questions, identify:

Material → Environment → Temperature → Damage appearance → Inspection method

before selecting the mechanism.

API RP 572 – Pressure Vessel Inspection

API RP 572 provides practical guidance on inspection practices for pressure vessels.

Questions may involve:

• External inspection
• Internal inspection
• On-stream inspection
• Inspection planning
• Vessel components
• Common deterioration locations
• NDE selection
• Inspection limitations

Use RP 572 when the question is asking how or where a pressure vessel should practically be inspected.

API RP 576 – Pressure-Relieving Devices

API RP 576 covers inspection of pressure-relieving devices.

Open-book questions can involve:

• Spring-loaded pressure-relief valves
• Pilot-operated valves
• Rupture disks
• Inspection
• Testing
• Fouling
• Corrosion
• As-received testing
• Installation
• Inlet piping
• Discharge piping
• Inspection frequency
• Records

A useful question to ask is:

Is this question about the pressure vessel itself or the device protecting it against overpressure?

If it concerns the PRD, API RP 576 is likely relevant.

API RP 577 – Welding

API RP 577 covers welding processes, inspection, and metallurgy.

Important open-book subjects include:

• SMAW
• GTAW
• GMAW
• SAW
• FCAW concepts
• Welding consumables
• Preheat
• PWHT
• Welding discontinuities
• Hydrogen cracking
• Welding inspection

Use API RP 577 when the question asks about the practical characteristics or inspection of welding.

For formal qualification of a WPS, PQR, or welder, move to ASME Section IX.

API RP 578 – Material Verification

API RP 578 is also included in the current API 510 reference list.

Material Verification Program questions can involve:

• Positive Material Identification
• Alloy verification
• Material mix-ups
• Identification of alloy components
• Material verification programs
• Documentation
• Inspection strategy

Do not overlook RP 578 simply because many traditional API 510 study courses concentrate more heavily on 571, 572, 576, and 577.

ASME Section VIII Division 1

ASME Section VIII is one of the most important references for API 510 numerical and construction questions.

The current Effectivity Sheet includes:

• Introduction U
• UG
• UW
• UCS
• Appendices 1–4
• Appendix 6
• Appendix 8
• Appendix 12

from the 2025 Edition. 

Questions may involve:

• Shell thickness
• Head thickness
• MAWP
• Joint efficiency
• Hydrostatic testing
• Pneumatic testing
• Radiography
• Nozzle welds
• PWHT
• Impact testing
• NDE acceptance

ASME Section V

Use ASME Section V for NDE method and technique requirements.

Current API 510 coverage includes:

• Article 1
• Article 2 – RT
• Article 6 – PT
• Article 7 – MT
• Article 23 / SE-797 – ultrasonic thickness measurement

Remember:

Section V tells you how the examination is performed.

The referencing Code generally determines the applicable acceptance requirement.

ASME Section IX

Use Section IX for welding qualification questions.

Typical questions can involve:

• WPS
• PQR
• WPQ
• P-Numbers
• F-Numbers
• A-Numbers
• Essential variables
• Nonessential variables
• Qualification ranges
• Mechanical testing
• Welder positions
• Thickness qualification

Before searching Section IX, identify whether the question concerns:

Procedure qualification

or

Welder performance qualification.

That distinction will immediately narrow your search.

ASME PCC-2

ASME PCC-2 provides recognized repair methods for pressure equipment and piping.

For the current API 510 exam cycle, API specifies selected PCC-2 Articles covering subjects such as:

• Butt-welded insert plates
• External weld buildup
• Alternatives to PWHT
• In-service welding
• Weld buildup and overlay
• Fillet-welded patches
• Cr-Mo repair welding
• Hot taps
• Flaw excavation and weld repair
• Flange repair
• Heat exchanger repair
• Pressure and tightness testing
• NDE in lieu of pressure testing

The exact included Articles are identified on the API Effectivity Sheet.

Types of Questions to Expect in Open-Book Practice

A strong 30-question practice set should mix several question styles rather than asking 30 simple Code lookups.

Direct Code Lookup

Example concept:

What interval or condition is specified by API 510?

These test your ability to locate a specific rule.

Table Lookup

Example:

What joint efficiency applies to this weld configuration?

These require finding and correctly reading an ASME table.

Figure or Curve Question

Examples can involve:

• UCS-66 impact-test exemption curves
• Weld diagrams
• Nozzle attachment details

Calculation Question

Possible subjects include:

• Corrosion rate
• Remaining life
• MAWP
• Required shell thickness
• Head thickness
• Static head
• Hydrostatic-test pressure
• Pneumatic-test pressure

Scenario Question

A question may describe a vessel condition and ask which requirement applies.

These often require combining:

Technical understanding + Code navigation.

Welding Qualification Question

You may need to compare a WPS, PQR, or WPQ against ASME IX requirements.

Repair Question

You may need to identify whether an activity is a repair or alteration and determine applicable API 510/PCC-2 requirements.

Essential API 510 Open-Book Calculations

Candidates should be comfortable locating and applying formulas involving:

Corrosion Rate

Conceptually:

Corrosion Rate = Thickness Loss ÷ Time

Make sure the correct historical thickness readings and time interval are used.

Remaining Life

Remaining Life = (Current Thickness − Required Thickness) ÷ Corrosion Rate

Do not confuse:

• Actual thickness
• Required thickness
• Corrosion allowance

Cylindrical Shell Required Thickness

For the applicable internal-pressure equation:

t = PR / (SE − 0.6P)

Cylindrical Shell Allowable Pressure

P = SEt / (R + 0.6t)

2:1 Ellipsoidal Head

For the applicable standard geometry:

t = PD / (2SE − 0.2P)

Hydrostatic Test

A commonly tested ASME VIII relationship uses:

1.3 × MAWP × applicable stress ratio

Pneumatic Test

A commonly tested relationship uses:

1.1 × MAWP × applicable stress ratio

Always apply the complete current Code requirements rather than relying only on memorized formulas.

How to Read an Open-Book Question

Before opening any reference, identify four things.

1. What Is Being Asked?

Is the question asking for:

• A number?
• An interval?
• A requirement?
• A material?
• A welding qualification?
• An NDE method?
• A repair method?

2. What Topic Is It Testing?

Determine the technical subject.

3. Which Reference Owns That Topic?

Go instantly to the most likely document.

4. Is It a Lookup or Application Question?

Some questions need only one paragraph.

Others require:

Find requirement → interpret values → calculate/apply → choose answer.

This distinction helps you manage time.

Open-Book Time Management

The current API 510 open-book examination provides 3.75 hours for 60 questions. 

That means candidates cannot spend ten minutes researching every difficult question.

A good strategy is:

First pass: answer questions whose references and solutions are clear.

Second pass: return to longer calculations or difficult Code searches.

Final pass: review unanswered or flagged questions.

Do not allow one difficult lookup to consume the time needed for several easier questions.

How to Use This 30-Question Practice Test

For a realistic exercise, complete all 30 questions without referring to answer explanations until the end.

Use only the references applicable to the current API 510 exam.

During the exercise:

• Identify the governing publication before searching.
• Record the paragraph/table/figure used.
• Show calculations.
• Mark uncertain answers.
• Review every incorrect response.

The objective is not merely to obtain a score.

The objective is to become faster at finding the correct requirement.

Create a Code Navigation Log

While practicing Chapter 17, maintain a simple navigation log.

After several practice sessions, the reference locations become familiar.

That familiarity is one of the biggest advantages you can develop before the real examination.

Learn Code Structure Instead of Memorizing Page Numbers

Page numbers can change between editions or electronic document layouts.

A better approach is to remember:

Code → Section → Paragraph/Table/Figure

For example:

ASME VIII → UCS-66 → impact-test exemption

is more useful than memorizing a PDF page number.

Likewise:

ASME IX → Article II → procedure qualification

is more reliable than remembering where a paragraph happened to appear in your study copy.

Use Keywords Carefully

When using electronic Code navigation, search using technical terminology from the question.

For example:

Question says:

“postweld heat treatment exemption”

Useful concepts to locate include:

PWHT, UCS-56, or the relevant repair provision.

Question says:

“surface crack on austenitic stainless steel”

Think:

PT → ASME Section V Article 6

Question says:

“welder qualification position”

Think:

ASME IX Article III / applicable QW performance rules

Do not search an entire Code for a long sentence copied from the question.

Identify the engineering concept first.

Do Not Overlook Notes and Footnotes

Many incorrect open-book answers result from reading only the main row of a table.

Code requirements can depend on:

• Notes
• Footnotes
• Exceptions
• Referenced paragraphs
• Material limitations
• Thickness limitations

When you find the apparent answer, check whether the table or paragraph contains conditions that change it.

Understand “Shall,” “Should,” and “May”

Code wording matters.

Generally:

Shall indicates a mandatory requirement.

Should indicates a recommendation.

May indicates permission or an option.

The exact context remains important, but recognizing these words helps interpret Code questions correctly.

Watch for “Except,” “Unless,” and “Provided That”

Some of the hardest open-book questions test an exception rather than the main rule.

Read carefully when you see wording such as:

• Except
• Unless
• Alternatively
• Provided that
• Where permitted
• When required
• Subject to

The first sentence you find may not be the complete answer.

Calculation Questions – Write Variables First

Before using your calculator, write the variables.

Example:

P = ?

S = given

E = given

R = given

t = given

Then select the formula.

This prevents common errors such as:

• Using diameter instead of radius
• Forgetting joint efficiency
• Adding corrosion allowance incorrectly
• Using design pressure when MAWP is required
• Mixing millimetres and inches

Do Not Mix Code Editions

Your practice material should match the edition listed on the Effectivity Sheet for your exam.

For the current September 2026–May 2027 cycle, the ASME BPVC reference is the 2025 Edition, while individual API Recommended Practices use the editions specified on the current Effectivity Sheet.

Using an old table or formula note can lead to an incorrect answer even when your Code-navigation method is otherwise correct.

Open-Book vs Closed-Book Study

The two parts require different preparation.

Closed-Book Preparation

Concentrate on:

• Fundamental concepts
• Frequently used rules
• Terminology
• Basic formulas
• Inspector responsibilities
• Common damage mechanisms

Open-Book Preparation

Concentrate on:

• Code navigation
• Tables
• Figures
• Detailed requirements
• Exceptions
• Calculations
• Welding qualification review
• Repair requirements
• Cross-references

Do not prepare for both sections using only memorization.

30 Open-Book Sample Questions – Recommended Coverage

Your Chapter 17 test should ideally contain a balanced mix such as:

The 30 questions do not need to be distributed equally, but the test should require candidates to move between several references.

Common API 510 Open-Book Exam Mistakes

Searching Before Understanding the Question

Determine the topic before opening the Code.

Using the Wrong Reference

A welding-process question may belong in API RP 577, while a welding-qualification question belongs in ASME IX.

Stopping at the First Search Result

Always check surrounding paragraphs, notes, and exceptions.

Spending Too Long on One Question

Flag difficult questions and return later.

Using Old Code Editions

Study from the Effectivity Sheet applicable to your exam date.

Memorizing Answers Instead of Locations

Knowing that the answer was “B” during practice does not help when the exam changes the scenario.

Remember where and why the rule applies.

Ignoring Units

Check psi, MPa, inches, millimetres, feet, and other units before calculating.

Ignoring Joint Efficiency

E can significantly change ASME VIII design calculations.

Forgetting Static Head

Liquid head can affect pressure at lower vessel elevations.

Confusing Required Thickness With Actual Thickness

These values serve different purposes in corrosion, remaining-life, and MAWP calculations.

How to Review an Incorrect Open-Book Question

Do not merely record:

Correct Answer: C

Instead, record:

Topic: Impact-test exemption
Reference: ASME VIII
Location: UCS-66
Why I missed it: Used wrong material curve
Correct method: Identify material → curve → thickness → temperature → adjustment

For another question:

Topic: Welder qualification
Reference: ASME IX
Problem: Looked in procedure qualification instead of performance qualification
Correction: WPQ → Article III

This turns every mistake into a navigation lesson.

Take the Free API 510 Chapter 17 Open-Book Practice Test

Now take the free API 510 Chapter 17 – 30 Open-Book Sample Questions and Answers Practice Test.

For the best preparation:

1. Use the current examination references.
2. Work under timed conditions.
3. Do not check answers while taking the test.
4. Record the Code location for each answer.
5. Show all numerical calculations.
6. Review both correct and incorrect answers afterward.

A correct answer reached by guessing does not demonstrate open-book readiness.

The goal is to be able to say:

“I know which document controls this question, where the requirement is located, and why the answer is correct.”

Current API 510 Exam Structure

For the current API 510 certification exam:

Total Questions: 170

Closed-Book Questions: 110

Open-Book Questions: 60

Scored Questions: 140

Pretest Questions: 30

Closed-Book Time: 2.75 hours

Open-Book Time: 3.75 hours

API states that the overall exam day also includes a tutorial and a 45-minute lunch break. 

Current API 510 Open-Book References

For the September 2026, January 2027, and May 2027 exam cycle, candidates should prepare using the editions specified by API, including:

API 510 – 11th Edition

API RP 571 – 3rd Edition

API RP 572 – 5th Edition

API RP 576 – 5th Edition

API RP 577 – 3rd Edition with applicable errata

API RP 578 – 4th Edition

ASME BPVC – 2025 Edition

ASME PCC-2 – 2022 Edition

Only the portions identified on the official Effectivity Sheet are within the applicable examination scope. 

Buy API 510 Exam Learning Package Study Material

Want more practice after completing the free 30-question open-book test?

UpWeld offers an API 510 Exam Learning Package containing more than 5,000 independently developed practice questions covering theory, Code navigation, practical scenarios, and numerical calculations.

API 510 Question Bank – 5,000+ Practice Questions

The learning package includes practice covering:

• Closed-book style questions
• Open-book style questions
• API 510
• API RP 571
• API RP 572
• API RP 576
• API RP 577
• API RP 578
• ASME Section V
• ASME Section VIII
• ASME Section IX
• ASME PCC-2
• Pressure-vessel calculations
• Corrosion rate
• Remaining life
• MAWP
• Shell and head calculations
• Hydrostatic testing
• Pneumatic testing
• Welding
• WPS/PQR/WPQ
• NDE
• PWHT
• Impact testing
• Damage mechanisms
• PRDs
• Repairs
• Alterations
• Rerating
• Practical scenarios
• Numerical calculations

API 510 Learning Package Price

5,000+ Practice Questions

Cost: $100 USD

Email: upweld.org@gmail.com

WhatsApp: https://wa.link/4dn6ee

Additional study guidance and supporting preparation resources may also be included with the package.

Use the UpWeld question bank as a practice and revision resource alongside the official API and ASME references applicable to your examination window.

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

Continue Your API 510 Exam Preparation

Chapter 17 should be used as the integration test for everything learned in Chapters 1–16.

When you finish the 30 questions, do not focus only on your percentage score.

Review:

Which Codes took me longest to navigate?

Which calculations caused mistakes?

Did I confuse API requirements with ASME requirements?

Did I miss notes or exceptions?

Was I able to identify the correct reference before searching?

The strongest open-book preparation sequence is:

Understand the question → Identify the subject → Select the reference → Locate the requirement → Apply the requirement → Check exceptions → Calculate if necessary → Select the best answer.

That is the skill this Chapter 17 practice test should develop.

Disclaimer

UpWeld is an independent educational and exam-preparation platform. UpWeld is not affiliated with, sponsored by, authorized by, or endorsed by the American Petroleum Institute, ASME, or their certification programs.

API, API 510, API Recommended Practices, ASME, ASME BPVC, PCC-2, 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 structure, reference editions, and syllabus 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 570 Exam Chapter 19 – The Final Word on Exam Questions