API 510 Pressure Vessel Design & Fabrication Standards 5

Question 1

Per ASME Section VIII Div. 1 UW-11, when is spot (10%) radiographic examination required rather than full radiography for Category B and C butt welds?

Accepted Answer

When the designer selects spot RT for the joint efficiency credit of 0.85

Answer

Spot RT per UW-11(b) is selected at the designer's option to obtain a joint efficiency of 0.85, rather than full RT (E=1.00) or no RT (E=0.70).

Question 2

What is the primary purpose of the Manufacturer's Data Report (Form U-1) required by ASME Section VIII Div. 1?

Accepted Answer

To certify that the vessel was designed, fabricated, and inspected in accordance with the Code

Answer

The U-1 form is the Manufacturer's Data Report certifying that the pressure vessel was designed, fabricated, and inspected in full conformance with ASME Section VIII Div. 1.

Question 3

When calculating the required shell thickness for a horizontal vessel, which load combination per ASME VIII-1 UG-22 must the designer consider in addition to design pressure?

Accepted Answer

Weight of vessel contents, weight of vessel itself, and wind or seismic loads

Answer

UG-22 requires consideration of internal/external pressure plus weight (vessel, contents, attachments), wind, seismic, and other applicable loadings when determining required thickness.

Question 4

A weld joint between a nozzle neck and a shell is classified under ASME VIII-1 as which weld joint category?

Accepted Answer

Category D

Answer

Category D per UW-3 covers welds connecting nozzles, communicating chambers, or other connections to the main shell, head, or side plates.

Question 5

In ASME Section VIII Div. 1, what is the minimum thickness (t_min) for a flat unstayed circular head attached by welding per UG-34?

Accepted Answer

t = d × sqrt(CP / SE)

Answer

UG-34(c) gives the formula t = d × sqrt(CP/SE) for flat circular heads, where C is a coefficient based on attachment method.

(API 510) Certified Pressure Vessel Inspector Practice Test

(API 510) Certified Pressure Vessel Inspector Practice Test

API 510 Pressure Vessel Design & Fabrication Standards 5