API 510 Pressure Vessel Design & Fabrication Standards 3

Question 1

In ASME Section VIII Div. 1, what is the maximum allowable working pressure (MAWP) stamped on a vessel's nameplate based on?

Accepted Answer

The weakest element of the completed vessel at the designated temperature

Answer

Per UG-98, the MAWP stamped on the nameplate is the maximum pressure permissible at the top of the vessel based on the weakest component.

Question 2

Which ASME Code category of welded joints includes circumferential seams connecting shells to heads?

Accepted Answer

Category B

Answer

Category B per UW-3 includes circumferential welded joints in the main shell, including head-to-shell seams.

Question 3

A vessel fabricated to ASME Section VIII Div. 1 requires post-weld heat treatment (PWHT). Per UCS-56, what is the standard holding temperature range for P-No. 1 carbon steel?

Accepted Answer

1100°F to 1200°F (593°C to 649°C)

Answer

UCS-56 specifies a PWHT holding temperature of 1100°F to 1200°F (593°C to 649°C) for P-No. 1 carbon steel.

Question 4

Under ASME VIII-1 UG-84, what is the purpose of a Charpy impact test for pressure vessel materials?

Accepted Answer

Determine resistance to brittle fracture at low temperatures

Answer

Charpy V-notch impact tests per UG-84 assess a material's notch toughness to prevent brittle fracture, especially at low minimum design metal temperatures (MDMT).

Question 5

What is the minimum required preheat temperature for welding P-No. 1 Group 2 carbon steel greater than 1.5 in. thick per ASME Section VIII Div. 1 (UCS-56 and applicable WPS requirements)?

Accepted Answer

150°F (66°C)

Answer

ASME Section I/VIII and WPS requirements generally require 150°F (66°C) preheat for P-No. 1 carbon steel over 1.5 in. thick to prevent hydrogen cracking.

(API 510) Certified Pressure Vessel Inspector Practice Test

(API 510) Certified Pressure Vessel Inspector Practice Test

API 510 Pressure Vessel Design & Fabrication Standards 3