DDS Flashcards
If the CAMS (control and monitoring panel) is OOC or performance is suspect what may be used in its place to monitor CO2?
GEOTECH Monitor
What is a LOC?
Lock Out Chamber
What is the max allowable CO2 for the GEOTECH CO2 monitor and the CAMS?
1000 ppm (GEOTECH)
1000 ppm / 0.76 torr (CAMS)
What checks need to be accomplished prior to entry of the DDS?
Check for the presence of water and ventilated for 5 min
What speed and depth must the host ship not exceed when divers are outside the DDS?
1-1/2 knots
130 FSW (host ships deck)
What is considered acceptable for the ambient air concentration of hydrogen?
3 % or lower (acceptable)
- 4% -8% (ignite if lit)
- <8% (EXPLOSION)
During a electrical guard fault/hangar power circuit fault what must be done prior to switching the S2 switch to the both position?
Switch S1 to the off position
What are the SDV batteries made of and what gas do they produce?
Silver Zinc Cells which produce hydrogen gas
What are the 3 components of the DDS?
- Chamber
- Hangar
- Trunk
What CO2 level constitutes ventilation of each compartment?
20,000 ppm (2%)
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?
Turn the breakers on and off
What is the maximum authorized depth in the hangar?
130 fsw
What is the minimal manning of the DDS whenever the LOC upper hatch is shut?
2 DDS operators
How much does the fairing weigh?
400 lbs
How much is the DDS hoist rated to?
2000lbs
How much does the DDS watertight door weigh?
500 lbs
Using the ships HP blow from below what keel depth will exceed the maximum ascent rate for divers?
65 FSW
Where do you find information about installing secondary cradle restrain straps prior to surfacing?
Appendix G & Figure G-1
In the event of an injured diver, who can recommend the depth of transfer trunk to 60 FSW?
UMO
If the SHF-1 will not shut and the SDV is present the host ship shall not dive deeper than how many FSW?
160 FSW
If the SHF-1 will not shut and the SDV is not present the host ship shall not dive deeper than how many FSW?
200 FSW
If SHF-1 fails to shut with waves higher 4 feet, what must be done?
The hangar door stop link and pin shall be inspected for deformity
Training for SHF-1 not shutting (SEP-23), if authorized if wave height is lower than what?
3ft
When the GEOTECH/CAMS reaches 2000 ppm (1.5 torr) divers must go on emergency breathing source at what boat pressure?
760 torr
