API 575 Section 4

Question 1

The inspection guidelines of API 572 should be followed when the operating pressure exceeds:

A. 0.05 psig.
B. 0.5 psig.
C. 2.5 psig.
D. 15 psig.

Answer 1

D. 15 psig (4.1.1)

Question 2

As the product temperature increases, the product’s vapor pressure:

A. decreases.
B. decreases only if specific gravity is less than 1.0.
C. increases.
D. increases only if specific gravity is less than 1.0.

Answer 2

C. increases. (4.2.2)

Question 3

A pressure-vacuum vent is installed on a tank. The PV vent will ensure that the inside pressure or inside vacuum does not exceed:

A. 0.0 psig.
B. a few ounces per square inch.
C. 2.5 psig.
D. 15 ounces per square inch. E. 15 psig.

Answer 3

B. a few ounces per square inch. (4.2.2)

Question 4

Which is most common type of storage tank?

A. Cone roof tank
B. Geodesic Dome roof tank
C. External floating roof tank
D. Internal floating roof tank

Answer 4

A. Cone roof tank (4.2.3.1)

Question 5

While operating, which tank type roof is normally supported by internal members?

A. Cone roof
B. Dome roof
C. Floating roof
D. Umbrella

Answer 5

A. Cone roof (4.2.3.1)

Question 6

Fixed-roof tanks are often self-supporting when tank diameter does not exceed:

A. 20 feet.
B. 40 feet.
C. 60 feet.
D. 100 feet.

Answer 6

C. 60 feet. (4.2.3.1)

Question 7

Which of the following is not an advantage of an umbrella roof or a geodesic dome roof?

A. Low cost roof
B. Keeps snow and rain off of an internal floating roof
C. Can be used on any size of tank
D. Does not require internal supports

Answer 7

A. Low cost roof (4.2.3.1/2)

Question 8

What is the primary reason for using a floating roof instead of a cone roof tank?

A. Less affected by severe weather
B. Less expensive
C. Less maintenance issues
D. Minimizes vapor emissions

Answer 8

D. Minimizes vapor emissions (4.2.3.3.1)

Question 9

Which type of floating-roof is the most susceptible to sinking?

A. External floater with a Double-deck
B. External floater with a Pan (single-deck)
C. External floater with an Annular Pontoon
D. Internal floater with metallic sandwich panels

Answer 9

B. External floater with a Pan (single-deck) (4.2.3.3.1)

Question 10

Why are internal floating roofs sometimes used?

A. Lowers construction costs
B. Reduces vapor loss
C. Minimizes effects of weather (rain & snow)
D. Either reduces vapor loss or minimizes effects of weather (rain & snow)

Answer 10

D. Either reduces vapor loss or minimizes effects of weather (rain & snow) (4.2.3.3.2)

Question 11

Which is the most common type of floating-roof seal?

A. Foam log
B. Mechanical shoe
C. Air bladder
D. Wiper

Answer 11

B. Mechanical shoe (4.2.3.3.3)

Question 12

How does a mechanical shoe work?

A. Gravity is used to place the shoe up by the tank shell
B. A spring or counterweight pulls the shoe against the tank shell
C. A spring or counterweight pushes the shoe against the tank shell
D. A low-friction non-metallic is placed between the shoe and the tank shell

Answer 12

C. A spring or counterweight pushes the shoe against the tank shell (4.2.3.3.3)

Question 13

Which of the following floating roofs is normally constructed of aluminum alloys or stainless steels?

A. Double-deck
B. Internal floater on floats
C. Internal metallic pan floating roofs
D. Pontoon

Answer 13

B. Internal floater on floats (4.2.3.4.e)

Question 14

Low-pressure storage tanks are built to which code?

A. API 620
B. API 650
C. API 650 Annex F
D. API 650 Annex I

Answer 14

A. API 620 (4.3.1)

Question 15

Low-pressure storage tanks are those with a design pressure from:

A. 0.0 - 0.05 psig.
B. 0.05 – 2.5 psig.
C. 2.5 – 15 psig.
D. 5.0 – 25 psig.

Answer 15

C. 2.5 – 15 psig. (4.3.1)

Question 16

API 620 Appendix R provides design rules for refrigerated tanks with design temperatures between:

A. -60 to 40 °F.
B. -50 to 32 °F.
C. -100 to 0 °F.
D. -325 to -60 °F.

Answer 16

A. -60 to 40 °F. (4.3.1)

Question 17

API 620 Appendix Q provides design rules for refrigerated tanks with design temperatures between:

A. -60 to 40 °F.
B. -50 to 32 °F.
C. -100 to 0 °F.
D. -325 to -60 °F.

Answer 17

D. -325 to -60 °F. (4.3.1)

Question 18

Low-pressure storage tanks are normally used for products that have a:

A. vapor pressure that exceeds limits of API 650.
B. low vapor pressure.
C. specific gravity that exceeds limits of API 650.
D. low specific gravity

Answer 18

A. vapor pressure that exceeds limits of API 650. (4.3.2)

Question 19

Hemispheroid, spheroid, and noded spheroid tanks are commonly used when the design pressure exceeds:

A. 2.5 psig.
B. 5.0 psig.
C. 10.0 psig.
D. 125.0 psig

Answer 19

B. 5.0 psig. (4.3.3.1)

Question 20

Which code covers refrigerated liquefied gas tank systems?

A. API 620
B. API 625
C. API 650
D. API 2201
E. UL-142

Answer 20

B. API 625 (4.3.4)