Question 1

A NPS 4 Schedule 80 (0.337" wall) branch connection is welded into a NPS 6 Schedule 40 (0.280" wall). A 0.375" reinforcing pad is used around the branch connection. The fillet weld sizes are as required by the Code. The branch connection is inserted into the header. The material of the branch and header is ASTM A672 Grade B70. What thickness would be used to determine whether heat treatment of the connection is required ? (Express answer to nearest hundredth)

Options :

A : 0.768"

B : 0.891"

C : 0.998"

D : 0.567"

Answer: B

Question 2

A blank is required between two NPS 10, 300 lb. class flanges. The maximum pressure in the system is 385 psi at 200 degrees F. A corrosion allowance of 0.175" is required. The inside diameter of the gasket surface is 9.25". The blank is ASTM A516 Grade 70 material with no weld joint. Calculate the pressure design thickness required for the blank

Options :

A : 0.789"

B : 0.692"

C : 0.556

D : 0.768"

Answer: B

Question 3

Austenitic stainless steels typically contain chrome and nickel, and are used for:

Options :

A : corrosion resistance

B : resistance to high temperature degradation

C : sulfur resistance

D : both a and b, above

Answer: D

Question 4

Steels with CE greater than 0.55% typically require:

Options :

A : Preheating only

B : Pre-heating & PWHT

C : No pre- heating or PWHT

D : PWHT only

Answer: B

Question 5

A local area has been thinned on the wall thickness of a flanged fitting. The fitting is NPS 8 Class 400, and the local area has been thinned to 0.400”. Is this corrosion acceptable per ASME B 16.5?

Options :

A : Yes

B : No

C : Cannot be calculated from information given

D : Wall thicknesses may not be less than that shown in B16.5

Answer: B