19.3 Pressure Equipment Sector Codes (ASME, NBIC, API context)

The Pressure Equipment (PE) specific exam uses the same three headings as General Industry — codes, applications, techniques — and a different book list. PE codes items are not a request to recite unpublished millimetre tables from ASME Section VIII paragraph UW-51 or from ASME B31.3. They are a request to know which book owns technique, which book owns acceptance, and how to apply the paragraph printed in the stem to a vessel, boiler, pipe, nozzle, or casting.

If you remember one PE sentence, remember this: ASME Section V is the NDE technique book. Construction and in-service books own acceptance. Candidates who treat Section V as a hidden reject catalog, or who treat API 510 as a new-construction vessel code, miss items that were sitting in the stem the whole time.

ASME Section V as the technique book

ASME Boiler and Pressure Vessel Code, Section V, Nondestructive Examination, is how NDE is performed when a construction or in-service book sends you there. It is organized in articles by method. You do not need an unpublished ASNT article-to-item map, but you do need to know what kind of rule lives in Section V:

When a PE procedure says "radiographic examination shall be in accordance with ASME Section V, Article 2," it is locking how the shot is made: source-side or film-side IQI as required, density in the specified range, identification, geometric unsharpness limits the article and the procedure print. It is not saying that a 6 mm slag line is accept or reject. That sentence, when it exists, lives in the referencing construction code (for vessels, often Section VIII; for power boilers, Section I; for piping, B31.1 or B31.3) or in the in-service book if the work is a repair, alteration, or remaining-life inspection.

Section V also does not certify the inspector. Personnel qualification still comes from the employer's written practice and from whatever central credential that practice accepts. Do not answer a PE personnel item with "Section V issued the badge."

What a PE procedure copies out of Section V

A shop PE procedure is usually a Section V article turned into work instructions: essential variables, calibration blocks, IQI wire or hole type, magnetizing current, penetrant family, viewing conditions, report form. The Level II's job is to run those printed variables. If the stem asks "which of the following is required by the procedure paragraph," the answer is the variable the paragraph actually named — IQI in the area of interest, a designated calibration reflector, a minimum UV-A value, a required scan overlap — not a variable you wish had been there.

If the procedure is silent on a parameter that Section V treats as required when invoked, you do not invent a shop custom and call it Section V. You elevate. The exam version of that fact is: the printed paragraph wins; a remembered article number without text in the stem does not.

Construction books own new-work acceptance

New construction and new fabrication under the ASME family typically point at one of these books for what is acceptable. Learn them as context, not as memorized numeric tables.

UW-51 is the famous Section VIII neighborhood for radiographic examination of welded joints. You should recognize the name as a vessel-construction acceptance pointer. You should not memorize a homemade length-of-slag table and call it an ASNT secret. Editions change. Stems print the row they want. If a PE item wants a reject/accept decision, it will give you the paragraph or the table. Your job is to apply that printed cell to the indication in the stem — rounded versus elongated, in the weld versus in the parent, longer than the printed limit or not.

The same discipline applies to B31.3. Process piping has its own examination and acceptance chapter. It is not Section VIII with the word "pipe" swapped in. A stem about a process-piping girth weld is not answered from a remembered vessel radiograph table. A stem about a Section VIII Category A vessel seam is not answered from a remembered B31.3 note.

B31.1 versus B31.3 is a sector-literacy pair. Power piping and process piping are different books. They can require different extents of NDE and different acceptance. If the stem names B31.1, do not "helpfully" apply B31.3 because that is what your refinery job uses.

Section I is the boiler construction book. A power-boiler drum weld is not automatically a Section VIII vessel weld. The procedure and the data sheet should name Section I when that is the construction code. The Level II does not pick the ASME book that feels close.

In-service books own in-service acceptance

Once the equipment has been in service, a different family of documents often controls inspection, remaining life, repair, and alteration. The PE exam expects context, not an API card-quiz.

These books are not interchangeable with the construction books, and they are not interchangeable with each other.

• API 510 is not the new-construction code for a vessel still in the shop. New construction is Section VIII (or the book the contract named). API 510 is the in-service inspection code.
• API 570 is not a substitute for B31.3 on a new rack. B31.3 built the piping. API 570 inspects it later.
• API 653 is not a vessel book and not a piping book. A tank-bottom scan procedure that invokes 653 is answering a tank question.
• NBIC is the common repair-and-alteration companion to ASME-stamped boilers and vessels. A weld repair on an in-service drum may be an NBIC repair with Section V technique, not a new Section I fabrication.

A PE codes item that names "in-service piping, corrosion under insulation, API 570" is asking you to stay in that stack. Importing a B31.3 new-construction acceptance memory is the trap. A PE codes item that names "new Section VIII vessel, radiography of a Category A weld" is asking you to stay in the construction stack. Importing API 510 remaining-life language is the trap.

Jurisdictions and owners can add rules. The exam version is still: use the book the stem named. Do not average NBIC and API 510. Do not invent a hybrid.

How a Pressure Equipment item is actually built

Forget unpublished ASNT numeric secrets. Learn the three stem patterns. Almost every PE codes item is one of these.

Pattern 1 — Which variable is required?

The stem prints a procedure paragraph that invokes Section V and lists essential variables. It then asks which of four actions is required, or which change is not allowed.

Example shape (illustrative variables, not an ASNT key): "Procedure PE-RT-02 requires film radiography per Section V Article 2, IQI in the area of interest, density within the range printed on the technique sheet. The darkroom produces a film with the IQI visible but outside the location required by the paragraph." The required action is that the exposure does not meet the procedure, not that a Level II may relocate the IQI in the report because the penetrameter "looked fine."

Another shape: "The UT procedure requires a designated calibration reflector and a named scan overlap on a nozzle-to-shell weld. The Level II calibrates on a convenient back reflection from the shell and shortens the overlap to finish the shift." Both changes touch required variables. They are not Level II field adjustments.

Pattern 2 — Which indication is rejectable under the printed table?

The stem prints a short acceptance table or a paragraph that says, for example, elongated indications longer than a stated length are rejectable, cracks are not permitted, and a rounded indication below a stated diameter is acceptable. It then gives one measurement.

Apply the printed row:

1. Identify the indication class the table uses (crack, elongated, rounded, incomplete fusion, incomplete penetration, undercut).
2. Read the unit (length, diameter, depth, "not permitted").
3. Compare the measured value in the stem with that cell.
4. Ignore the number you memorized from a different edition or a different book.

If the printed cell says elongated indications longer than 6 mm are rejectable and the stem's slag line is 8 mm, the indication is rejectable under that printed table. If the stem's slag line is 4 mm, it is not rejectable under that cell — even if your shop's real UW-51 edition would have said something else last year. The exam is testing whether you can read. It is not testing whether you smuggled a code book into the Pearson VUE center.

Do not invent a numeric UW-51 or B31.3 table in your notes and treat it as the ASNT answer key. Construction codes change. The only safe number is the number in the item.

Pattern 3 — Which method does the procedure specify for this geometry?

The stem describes a nozzle, a butt weld, a fillet, a casting, or a repair cavity and prints a procedure sentence: "Nozzle-to-shell welds shall be examined by UT per Article 4 in lieu of RT where the procedure demonstration is approved," or "Steel castings within this thickness shall be radiographed," or "The root of this single-V pipe weld shall be examined by PT before filling." The question is which method the procedure named for that geometry, not which method you prefer and not which method the general-exam physics chapter said is "best" for subsurface work.

Worked shapes:

• A nozzle-to-shell weld with limited film access: the procedure names UT. You do not substitute a double-wall RT shot because you are more comfortable in the darkroom.
• A butt weld the construction code requires to be radiographed: the procedure names RT. You do not substitute UT because the line is already insulated unless the procedure and the referencing code allow that substitution.
• A casting the purchase order requires to be radiographed to a named procedure: RT is the method. A surface PT of the gate pad does not satisfy a volumetric casting requirement the procedure stated.
• A repair cavity the NBIC repair plan requires to be MT after excavation and VT plus MT after welding: you run those methods in that order. You do not skip the excavation MT because "the final MT will catch it."

Applications and techniques (next chapter) go deeper on access and essential technique choices. The codes version of the question is simpler: the procedure sentence is the answer.

Putting the stack together on one job

A new Section VIII vessel in the shop:

1. Contract names Section VIII Division 1 and the owner's spec.
2. Section VIII says which joints need which NDE and points at acceptance.
3. Section V, as invoked, says how that NDE is done.
4. The employer procedure and data sheet implement both layers for that joint.

An in-service process-piping circuit:

1. The inspection plan names API 570 and the owner's piping specification.
2. Remaining-life and repair decisions live in that in-service stack.
3. If a repair is welded, the repair procedure may point back at B31.3 construction rules, Section V technique, or both, as the plan states.
4. The Level II still does not mix a new-construction B31.3 memory into an API 570 corrosion-rate question that printed its own paragraph.

A power-boiler repair under NBIC:

1. NBIC and the jurisdiction own the repair authorization.
2. Section V (or the NBIC-named technique) owns how NDE of the repair is performed.
3. Acceptance of the repair weld is the paragraph the repair plan printed — not a remembered Section VIII shop table from when the boiler was new.

What the Level II may not substitute

The PE Level II applies the named procedure and the named referencing book. The PE Level II does not:

• Treat Section V as an acceptance catalog
• Drop a remembered UW-51 or B31.3 number onto a stem that printed a different cell
• Use API 510 on a new vessel still in the shop
• Use B31.3 on a B31.1 stem, or API 570 on a new rack, or API 653 on a vessel
• Swap RT for UT, or PT for MT, because access is annoying, unless the procedure and the referencing book already allow that substitution
• Average two books that disagree

Those substitutions are procedure or contract changes. They belong to the Level III, the Engineer of Record, or the document owner the written practice names.

Realistic exam scenarios

A stem asks where you read technique variables for a vessel radiograph that invokes ASME. Section V (as implemented by the procedure). A follow-up asks where you read whether the slag line is rejectable. The construction book or the printed table, not Section V by default.

A stem prints "elongated indications longer than 6 mm are rejectable; cracks not permitted" and gives an 8 mm elongated slag line with no crack. Reject on the printed elongated cell. Do not accept it because you remember a kinder number from another edition.

A stem names a nozzle-to-shell weld and quotes the procedure: ultrasonic examination per Article 4. The required method is UT, even if a coworker would rather shoot a film.

A stem names in-service tank-bottom inspection under API 653. The controlling in-service book is 653, not API 510 and not Section VIII.

A stem offers four numeric "UW-51" tables with no paragraph attached and asks which one ASNT requires you to memorize. The honest answer, if it appears as a process question, is that ASNT does not publish those numbers as program secrets — apply the table in the item. If the item instead prints one table, that table is the entire world of the question.