API 510 Material Evaluation and Selection

Question 1

Why is material identification important for pressure vessel inspection?

Accepted Answer

To verify the correct material was used and ensure compatibility with service conditions

Answer

For inventory purposes only

Answer

To determine vessel color

Answer

For recycling planning

Question 2

What is positive material identification (PMI)?

Accepted Answer

Field testing to verify the chemical composition of installed materials

Answer

Visual inspection of materials

Answer

Reviewing purchase orders

Answer

Checking paint color

Question 3

Which material property is most critical for pressure vessel service at elevated temperatures?

Accepted Answer

Creep resistance and elevated temperature strength

Answer

Color

Answer

Weight

Answer

Magnetic properties

Question 4

What is hydrogen-induced cracking and why is it a concern for pressure vessels?

Accepted Answer

Hydrogen atoms diffuse into steel, causing embrittlement and cracking under stress

Answer

It only affects plastic vessels

Answer

It is a surface cosmetic issue

Answer

It only occurs in copper

Question 5

What is the purpose of hardness testing during pressure vessel inspection?

Accepted Answer

To assess material condition and detect changes from original properties

Answer

To determine vessel age

Answer

To measure vessel capacity

Answer

To check paint adhesion

Question 6

When should material substitutions be evaluated during pressure vessel repairs?

Accepted Answer

When the original material is unavailable, ensuring the substitute meets or exceeds requirements

Answer

Never - exact match required always

Answer

Only for cosmetic repairs

Answer

Substitutions are always acceptable