(2024 Exam) USN Diving Umbilicals

Question 1

What is the max life of Rubber breathing has hose and synthetic umbilicals?

Answer 1

12 years for RubberSynthetic umbilical assemblies do NOT have a maximum lifetime limit.

Question 2

Proof test is conducted at a minimum of _____% the system maximum operating pressure? Operating pressure for breathing air is _____?

Answer 2

200%
300 psi

Question 3

Pressure the hose to twice the WP of the system OR 750psi (whichever is less) and hold the pressure for a minimum of ____?

Answer 3

:10

Question 4

If pressure is greater than 500psi, reduce the pressure to 500psi, lift hose assembly until the ___ lb dead weight is approximately ___ to ___” off the ground and hold for ___?

Answer 4

200 lb weight4” to 6” :10

Question 5

If the marks have “creeped” more than ___” during the course of testing, the hose is unacceptable?

Answer 5

1/16”

Question 6

Pneumofathometer Hoses are tested at ___ psi for ___min?

Answer 6

200psi for :10

Question 7

D-rings are tested at ___ lbs for ___mins?

Answer 7

500lbs for :10

Question 8

What MIP are umbilicals covered under?

Answer 8

MIP 5921/039

Question 9

When installing fittings into hoses, what lubricant is authorized to be used?

Answer 9

Clean Fresh Water.

Question 10

When installing a barbed fitting onto the end of the umbilical, leave a ____ +/- ____” gap?

Answer 10

0.06” +/- 0.03”

Question 11

What do you pressurize hot water hoses to for a pressure test?

Answer 11

Pressurize the hose to 100psi or twice the working pressure (whichever is less), hold for :10.

Question 12

When seizing cable to the D-rings, ____ “ _____ must be used?

Answer 12

3/16” nylon cord.