Chapter 5 (Section 4)

Question 1

What are the 3 main operations in the cleaning of a masker emitter belt?

Answer 1

1. External cleaning of the belt using a hand held hydraulic grinder
2. Diesel driven WBD-150N water jet machine connected to a flexible lance for interior wall cleaning, with access gained via the cleanout plug opening
3. Butterworth Zero Thrust Hydroblast Gun, modified in accordance with NAVSEA Drawing 6699567, to clean individual emitter holes.

Question 2

What does Chapter 5 cover?

Answer 2

Masker Emitter Belt

Question 3

How long can you use a Butterworth Zero Thrust Hydroblast Gun?

Answer 3

No more than 85 minutes by any one operator in any 24 hour period.

Question 4

What must be worn to operate a Butterworth Zero Thrust Hydroblast Gun?

Answer 4

KM-37 Diving Helmet

Question 5

What risk does the Butterworth Zero Thrust Hydroblast Gun pose?

Answer 5

Significant noise, presenting potential hearing loss hazard to the diver/operator.

Question 6

What kind of cleaning disks can be used for the hand held grinder?

Answer 6

D-3 or D-5 marine cleaning disk

Question 7

How much must the lance be inserted into the masker emitter belt before energizing?

Answer 7

A minimum of one foot.

Question 8

When a lance is energized, what must you never do?

Answer 8

Remove it from the masker emitter belt.

Question 9

What is the difference between a 37’ and 50’ lance?

Answer 9

The 37-foot lance is used for plate access belts, while the 50-foot lance is used for plug access belts.

Question 10

What must be done if the lance jams inside of the masker emitter belt?

Answer 10

Ensure that the HP water supply is secured before attempting to remove it.