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TESTS/EXAMS > DDS > Flashcards

DDS Flashcards

1
Q

If the CAMS (control and monitoring panel) is OOC or performance is suspect what may be used in its place to monitor CO2?

A

GEOTECH Monitor

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3
Q

What is a LOC?

A

Lock Out Chamber

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4
Q

What is the max allowable CO2 for the GEOTECH CO2 monitor and the CAMS?

A

1000 ppm (GEOTECH)

1000 ppm / 0.76 torr (CAMS)

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5
Q

What checks need to be accomplished prior to entry of the DDS?

A

Check for the presence of water and ventilated for 5 min

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7
Q

What speed and depth must the host ship not exceed when divers are outside the DDS?

A

1-1/2 knots

130 FSW (host ships deck)

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8
Q

What is considered acceptable for the ambient air concentration of hydrogen?

A

3 % or lower (acceptable)

  • 4% -8% (ignite if lit)
  • <8% (EXPLOSION)
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11
Q

During a electrical guard fault/hangar power circuit fault what must be done prior to switching the S2 switch to the both position?

A

Switch S1 to the off position

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12
Q

What are the SDV batteries made of and what gas do they produce?

A

Silver Zinc Cells which produce hydrogen gas

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13
Q

What are the 3 components of the DDS?

A
  1. Chamber
  2. Hangar
  3. Trunk
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14
Q

What CO2 level constitutes ventilation of each compartment?

A

20,000 ppm (2%)

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16
Q

If loss electrical power/ short circuit or CO2 scrubber/heater during O2 treatment or during high O2 in the chamber, what should you not do to troubleshoot until decompression treatment is completed?

A

Turn the breakers on and off

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17
Q

What is the maximum authorized depth in the hangar?

A

130 fsw

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19
Q

What is the minimal manning of the DDS whenever the LOC upper hatch is shut?

A

2 DDS operators

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20
Q

How much does the fairing weigh?

A

400 lbs

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21
Q

How much is the DDS hoist rated to?

A

2000lbs

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22
Q

How much does the DDS watertight door weigh?

A

500 lbs

23
Q

Using the ships HP blow from below what keel depth will exceed the maximum ascent rate for divers?

A

65 FSW

24
Q

Where do you find information about installing secondary cradle restrain straps prior to surfacing?

A

Appendix G & Figure G-1

25
Q

In the event of an injured diver, who can recommend the depth of transfer trunk to 60 FSW?

A

UMO

26
Q

If the SHF-1 will not shut and the SDV is present the host ship shall not dive deeper than how many FSW?

A

160 FSW

27
Q

If the SHF-1 will not shut and the SDV is not present the host ship shall not dive deeper than how many FSW?

A

200 FSW

28
Q

If SHF-1 fails to shut with waves higher 4 feet, what must be done?

A

The hangar door stop link and pin shall be inspected for deformity

29
Q

Training for SHF-1 not shutting (SEP-23), if authorized if wave height is lower than what?

A

3ft

31
Q

When the GEOTECH/CAMS reaches 2000 ppm (1.5 torr) divers must go on emergency breathing source at what boat pressure?

A

760 torr

32
Q

What degree of the ship’s roll prevents the LOC upper hatch from being opened, unless in an emergency?

A

10 degrees

35
Q

What is the minimum allowable head pressure during drain down?

A

10 FSW

36
Q

Above what PPO2 percentage increases fire hazard?

A

22%

40
Q

What is the maximum authorized depth in the transfer trunk?

A

165 FSW

43
Q

How frequently must operators report to the dive sup during any pressurization or depressurization?

A

Every 10 FSW

44
Q

At what PPM do the CO2 monitors alarm?

A

15,000 ppm

45
Q

What are the useful periods of no ventilation?

A

Hangar : 12,000 ppm SEV
Hangar Bubble : 5,000 ppm SEV
Transfer Trunk : 8000 ppm SEV
Chanber : 8,000 ppm SEV

46
Q

How long does the GEOTECH monitor readings lag behind current conditions?

A

Approximately 70 sec

47
Q

For ventilation shallower than what FSW shall the vent valve be fully opened?

A

7 FSW

TESTS/EXAMS (8 decks)

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