9- Leak Testing and Hydraulic Integrity of the Bottom

Question 1

Visual inspection may be direct type when the surface is readily accessible to place the eye within ,,,,,,of the surface at an angle of ,,,,,,,.

Answer 1

24 in. (61 cm)

not less than 30 degrees

Question 2

The minimum illumination is ,,,,,, for general viewing and ,,,,,,,, for viewing of small anomalies.

Answer 2

15-foot candles (25 lumens)

50-foot candles (100 lumens)

Question 3

Leak testing for bottom to shell weld joint is achieved by applying a ,,,,,,,,to one side of a weld, then letting it stand for at least ,,,,, hours ,,,,

Answer 3

highly penetrating oil or dye penetrate

four (12 hours is preferred)

Question 4

Bottom weld joint bubble test :
the inside surface of the bottom is coated with an ,,,,,, solution. Air at not more than ,,,,,, of water pressure is injected by a ,,,, under the bottom of the tank through the clay seal or through a drilled and tapped hole (or holes) in the bottom.

Answer 4

indicator
3 in. (0.75 kPa)
hose

Question 5

Bottom weld joint bubble test :
An alternative approach consists of pumping approximately ,,,, of water into the tank and then placing air at not more than ,,,, of water pressure under the tank. Leaks will be evident if air bubbles through the water in the tank

Answer 5

6 in. (150 mm)

9 in. (2.24 kPa)