Section 9 - Leak Testing

Question 1

Which of the following is not a RPB (release prevention barrier)

Answer 1

Concrete reinforced pad
double bottom tank
Under Tank Liner (diaper)
Effective bottom side CP–

Question 2

Advance leak detection systems are described in:

Answer 2

API 334

Question 3

Tank Hydraulic Integrity is just a fancy way of saying:

Answer 3

The tank is not leaking

Question 4

When visual inspection is performed, the inspector’s eyes should be within:

Answer 4

24 inches of the surface to be examined

Question 5

When visual inspection is performed, the amount of light needed for general viewing should be at least

Answer 5

15 foot candles

Question 6

When visual inspection is performed, the amount of light needed for inspecting small anomalies should be at least

Answer 6

50 foot candles

Question 7

A tank floor is tested with a type of bubble test examination. In this test, an indicator solution is sprayed on the top-side of the floor and low pressure air is added under the floor. The air pressure for this test should not exceed:

Answer 7

3” of water

Question 8

A tank floor is tested with another type of bubble test exam. In this test, about 6” of water is added inside the tank and low pressure air is added under the floor. The air pressure for this test should not exceeded:

Answer 8

9” of water

Question 9

The effectiveness of a tank floor Bubble Test can be improved by:

Answer 9

Tapping the entire botton with an air operated hammer. AIR HAMMER

Question 10

Another variation of the bubble test exam is to build a clay damn around the tank and add water under the tank. (basically a reverse hydro) The height of the water in the dam must be at least

Answer 10

6” above the highest point in the floor.

Question 11

Another method to test a tank floor is to inject an inert gas on the bottom side of the tank floor and use a gas detector on the top side. A common gas for this test is:

Answer 11

Helium

Question 12

A special leak detection method is called volumetric technology. The key measurements in this technology are:

Answer 12

Liquid Level and Temperature

Question 13

Another special leak detection method is called Mass Balancing Technology. The key measurements in this are:

Answer 13

Pressure and Temperature

Question 14

Another leak detection method is called the Chemical Marker Technology. Which of the following best describe this method?

Answer 14

Chemical is added to either the hydrotest water, or the tank’s product Detectors tubes are spaced on the bottom-side for air sampling

Question 15

When the chemical marker technology is used, the typical inoculation concentration is

Answer 15

1 to 10 ppm

Question 16

With Chemical Marker Technology, every part of the bottom should be within

Answer 16

20’ from a detection tube

Question 17

Acoustic Emission is being used to check for a tank leak. If a # of sensors are used then:

Answer 17

Only the general area of a leak can be determined.

Question 18

The sensor used in Acoustic Emission is called:

Answer 18

Accelerometer