ASME Construction Requirements: Sections I, IV, and VIII
The exam tests whether you can place a given item in the right ASME construction code and then apply that code's inspection and testing rules. Scope errors cascade: the wrong code means the wrong stamp, the wrong data report form, and the wrong test pressure.
Scope boundaries
- Section I (Power Boilers): steam boilers above 15 psig; high-temperature water boilers above 160 psig or above 250 °F. Includes superheaters, economizers, and other pressure parts. Symbol stamp S; Manufacturer's Data Report Form P-2.
- Section IV (Heating Boilers): steam not over 15 psig; water not over 160 psig and not over 250 °F. Symbol stamp H; Form H-2.
- Section VIII: unfired pressure vessels. Division 1 (U) for general service; Division 2 (U2) alternative rules with a lower design margin; Division 3 (U3) high pressure. Data Report U-1 / U-1A, partial report U-2.
Tests and certification
The hydrostatic test is 1.5 × MAWP for Section I and 1.3 × MAWP (corrected by the stress ratio at test temperature) for Section VIII Div. 1. The AI witnesses the test, verifies the gauge, reviews the data report, and only then may the item be stamped.
Worked example. A welded tank, design 175 psig at 300 °F, water service, ½ in. shell: it exceeds 15 psi and is not a boiler, so Section VIII Div. 1 applies - U stamp, Form U-1, hydro test 1.3 × 175 ≈ 228 psig with a stress ratio of 1.0. If the same tank were a heating boiler at 12 psig steam and 200 °F, Section IV would govern instead - H stamp, Form H-2, and the 160 psig / 250 °F water limits would not be engaged.
Traps. Reading the Section IV water limits as 160 psig or 250 °F instead of both; calling any fired unit a Section I boiler; applying Div. 1's 1.3 factor to a Section I boiler; forgetting that Div. 2 and 3 carry different stamps and reports. Passing a hydro test does not cure a scope error - a misclassified item is nonconforming even if it holds pressure.