Question 1

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

Question 2

The total resistivity for a Wenner 4-Pin test that utilizes pins spaced 2 feet apart and a 6 “R” factor is:

Options :

A : 2298 ohm/cm

B : 3500 ohm/cm

C : 6000 ohm/cm

D : 8000 ohm/cm

Answer: A

Question 3

Resistance to sulphidation is generally achieved by

Options :

A : Upgrading to higher nickel alloys

B : Upgrading to higher chromium alloys

C : Upgrading to higher copper based alloys

D : All of the above.

Answer: B

Question 4

During periodic scheduled inspections, more extensive inspection should be applied to an area beginning __________ upstream of the injection nozzle and continuing for atleast __________ pipe diameters downstream of the injection point.

Options :

A : 10 inches, 20

B : 12 feet, 10

C : 12 inches, 10

D : 10 feet, 10

Answer: C

Question 5

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