Pressure Vessel Design & Inspection Codes Flashcards
7 cards from real API 510 practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Pressure Vessel Design & Inspection Codes flashcards as text
According to API 510, post-weld heat treatment (PWHT) of a repair weld may be waived under certain conditions. Which factor most commonly allows this waiver?
Answer: The base metal P-number, wall thickness, and preheat meet the exemption criteria in the construction code
PWHT waivers are based on material P-number, thickness, preheat temperature, and other criteria specified in the original construction code such as ASME VIII.
Under ASME Section VIII Division 1, what is the minimum required thickness for a flat head cover versus a hemispherical head of the same diameter and design pressure?
Answer: Flat heads require significantly more thickness because they resist pressure by bending rather than membrane action
Flat heads must resist pressure by bending, which is far less efficient than the membrane (hoop) stress action in curved heads, requiring substantially greater thickness.
According to API 510, what is a 'rerating' of a pressure vessel?
Answer: A change to the established MAWP or temperature rating of the vessel
Rerating is a formal change to the vessel's MAWP or design temperature, either upward or downward, based on engineering calculations and inspection findings.
When API 510 refers to 'on-stream inspection,' what primary technique is used to assess internal corrosion without vessel entry?
Answer: Ultrasonic thickness measurement from the external surface
Ultrasonic thickness (UT) scanning from the outside is the primary on-stream method for measuring wall thickness and detecting internal corrosion without vessel entry.
In ASME VIII Division 1, the 'U' stamp on a pressure vessel certifies that:
Answer: The vessel was fabricated in accordance with ASME Section VIII Division 1 requirements
The ASME 'U' stamp indicates the vessel was designed, fabricated, inspected, and tested per ASME Section VIII Division 1, with a certified manufacturer's data report.
According to API 510, which document records the vessel's design data, material specifications, and inspection history and must be maintained by the owner/operator?
Answer: The vessel inspection record and documentation file
API 510 requires the owner/operator to maintain vessel inspection records including design data, inspection findings, repairs, and alterations throughout the vessel's service life.
Under ASME VIII Division 1, which head type is considered the code standard and typically used as the basis for most shell-and-tube heat exchanger channel closures?
Answer: 2:1 semi-ellipsoidal heads
The 2:1 semi-ellipsoidal head is the standard ASME VIII head type widely used in industrial vessels including heat exchanger channels due to its balance of efficiency and fabrication practicality.