API 570 Question Bank (API 570 QB001)

151) On buried piping, what is the frequency of pipe coating holiday surveys?

a) The frequency is governed by the leak test interval of the pipe

b) It is usually based on indications that other forms of corrosion control are ineffective.

c) Surveys are normally made every 5 years

d) Pipe coating holiday surveys are made when the pipe is excavated.

152) For a piping buried in lengths greater than __________ feet and not cathodically protected, evaluation of soil corrosivity should be performed at 5-year intervals.

a) 50

b) 75

c) 100

d) 150

153) If buried piping is cathodically protected, the system should be monitored at intervals in accordance with Section 10 of NACE RP0169 or Section 90 of API RP 651. 

API RP 651 specifies __________ interval.

a) Annual

b) Biannual

c) Biennial

d) Trennial

154) Buried piping inspected periodically by excavation shall be inspected in lengths of __________ feet at one or more locations judged to be most susceptible to corrosion

a) 2 to 4

b) 4 to 6

c) 6 to 8

d) 8 to 10

155) After excavation of buried piping, if inspection reveals damaged coating or corroded piping:

a) The condition should be noted in the records and the inspection interval shortened

b) The complete piping system must be day-lighted (excavated) for repair or replacement.

c) The damaged coating or corroded piping must be repaired or replaced

d) Additional piping shall be excavated until the extent of the condition is identified.

156) If buried piping is contained inside a casing pipe, the casing should be:

a) Capable of carrying the same pressure as the product pipe

b) Checked to see if its protective coating is intact and serviceable

c) Pressure tested to make sure it is serviceable

d) Inspected to determine if water and / or soil has entered the casing

157) An alternative or supplement to inspection of buried piping is leak testing with  liquid at a pressure at least __________ % greater than the maximum operating pressure at intervals ½ the length of those shown in Table 9-1 of API 570 for piping NOT cathodically protected and at the same intervals as shown in Table 9-1 for cathodically protected piping.

a) 5

b) 10

c) 25

d) 50

158) The leak test for buried piping should be for a period of __________ hours.

a) 4

b) 8

c) 12

d) 24

159) The leak test for a 8" diameter buried piping system is 300 psi. After 7 hours, the pressure reacts 273 psi. What should the inspector do?

a) Nothing is required. The loss of pressure is negligible and will not affect the test. The loss can be disregarded.

b) The system should be re-pressurised to the original leak test pressure and the test should begin again.

c) The test charts and the temperature should be reviewed to determine if any change in temperature caused the pressure drop.

d) The piping should be visually inspected externally and / or inspected internally to find the leak and assess the extent of corrosion.

160) A buried piping system that is not cathodically protected has to have an inspection interval set. The soil resistivity is checked and found to be 3400 ohm/cm. As the inspector, what interval would you set?

a) 2.5 years

b) 7.5 years

c) 5 years

d) 10 years

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