Tanks

Question 1

What is “free board” in regards to tanks?

Answer 1

Free board is a space kept between the top of water level and the bottom of the roof slab of a tank.

It is the depth between the overflow pipe and the base of the roof slab, i.e., the clearance maintained between the maximum water level and the roof slab.

Question 2

For a field-erected tank, what type of test is important for the bottom seams?

Answer 2

Vacuum box test

Question 3

What type of test is being described here: “_________ testing is a non-destructive examination used when trying to locate weld seam leaks. A vacuum box and a compressor create a high or low pressure vacuum while a detergent solution is applied to the test area. The detergent bubbles, making leaks visible within the created pressure envelope.”

Answer 3

Vacuum box test

Question 4

What type of test is pictured here?:

Answer 4

Vacuum box test

Question 5

What is this?

Answer 5

Air test hole

Question 6

For a pump suction line coming off a tank, you will often have a valve and an expansion joint. Which one should be first and why?

Answer 6

The valve should be directly on the tank nozzle, so if there’s a leak or repair needed to the expansion joint, you can isolate it without having to drain the tank.