(2024 Exam) UWSH General Flashcards
CH5 (Section 1) CH8 (Section 2) CH10 (Appen D11, Sec 10-3) Ch12 (Sec 5), Ch 13 (Sec 1) Ch 16 (appen. D)
Where are Masker Emitter belts installed?
Forward end of the Ship’s machinery spaces.
What are Masker Emitter belts made of?
Flattened 90/10 Copper-nickel (Cu-Ni) pipe epoxied into a fairing channel.
Why are Emitter belts electrically isolated from the ship?
Electrical isolation allows free copper ions to leach from the Cu-Ni belt and serve as an antifoulant, keeping the exposed belt free from marine growth.
Masker emitter belts electrical isolation from the ship is provided by a _____ ______ ______ placed in the bottom of the fairing channel and bonded with epoxy to a ______ ________.
Lexan insulator strip
Backing Plate
How much clearance below a SPU is needed to replace it on a SSN 774?
Clearance of at least 10’ between the bottom of the extended SPU and the seafloor.
Where is the SPU located on a SSN 774?
STBD side in main ballast tank 4A.
How many blades does the SPU propeller on a SSN 774 have?
12 blades. Not 3 like the 688 class.
What ___ major components make up the SPU on a SSN 774?
four
Rotational deployment mechanism (RDM), electrical motor, electrical power system and the SPU controls.
When removing the SPU, the ship should be in sufficient water depth to allow a minimum of _____ below the keel of the vessel?
10′ of water below the keel of the vessel.
What degree position shall the SPU be at prior to lowering it for removal?
Zero degree
The maximum allowable leak rate is ____ of water level rise within the SPU cofferdam Within a ______ time period?
4′′
1-hour period.
Prior to lowering the SPU, a minimum of ____ of cable slack must exist within or immediately above the RDM.
30′′
(ICCP) system must be reactivated within what time frame of the completion of divers’ operations?
2 hours
What are the two types of SRD (Sonar Rubber Domes) repairs?
Grooming repairs and Structural repairs.
What will also be required for Sonar dome repairs if water temp is less than 60 degrees or visibility is less than 10’?
Fresh water firemain, 110VAC/60Hz electrical power, and pier steam.
What are the two types of U/W repair kits for SRD?
1A (52” X 27”) and No. 3 (27” X 27”).
What type of lag bolts are used for SRD repair patches?
Stainless steel lag bolts (full thread- no bolt shoulder)
What is the bonding agent used for SRD repairs?
HP-2 ELASTOLOCK
What is caused by cavitation due to damaged SRD’s?
Noise Spoke.
What is used to clean the sonar dome of fouling, slime, and other contaminants?
A wire cup brush on a hydraulic grinder.
What is the approx. pot life of HP-2?
Approx. 50mins. Workability starts to degrade within 30mins.
Can you use air powered/pneumatic tools for SRD repairs?
No, due to their power and torque loss.
What can you do to prevent HP-2 from sticking to latex gloves?
wet them.
What is the minimum cure time of the HP-2 for SRD repairs.
5 days.
What psi is used to test SRD repairs for bow and keel mounted Sonar domes?
30psig- Bow
20psig- Keel
Diver Tools: What size bar does the U/W hydraulic chainsaw come with?
24”, saw is adaptable for use with 16” and 20” bar and chains.
What shall be established prior to operating any U/W tool?
Positive voice communications