Question 1

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 2

The three hardness tests normally used are the:

Options :

A : Schindler, Johnson, Williams

B : Rockwell, Vickes, Brinell

C : Rockwell, UT, Shearwave

D : Brinell, Vicky, Rockdale

Answer: B

Question 3

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 4

A combination of corrosion and erosion results in significantly greater metal loss that can be expected from corrosion or erosion alone. This type of loss occurs at

Options :

A : high-velocity and high-turbulence areas

B : areas where condensation or exposure to wet hydrogen sulphide or carbonates occur

C : surface-to-air interfaces f buried piping

D : areas where gradual loss of material occurs because of a corrosive medium

Answer: A

Question 5

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

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