(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
Always operate the U/W chainsaw with the _____ ____ ______ installed?
Bar tip guard
What is the recommended flow rate for the U/W hydraulic chainsaw?
14gpm
Why are hydraulic tools preferred over pneumatic tools?
Because of greater power transfer, improved work area visibility, and significantly longer tool life.
What is the preferred HPU’s for use with the U/W chainsaw and why?
For maximum performance of the chainsaw employ with NAVSEA Model 2 or Model 4 HPU. the MOD 2 or 4 is capable of meeting the required 14gpm required by the saw.
What hydraulic fluid is approved for use in NAVSEA hydraulic power units and diver tool systems?
E.F. HOUGHTON P.R. 1192 petroleumbase hydraulic fluid
Hydraulic fluid temperature must never exceed ____ F?
140 F
What is the recommended operating temperature range for the hydraulic diver tools?
80 F to 120 F
What can be done to heat hydraulic fluid?
a. Using procedures in a HPU manual, start the power unit with no tools connected. Set system maximum system relief pressure as recommended in the respective tool appendix. Observe temperature gauge until fluid temperature reaches desired level (at least 80o F).
b. Store hydraulic system in a warm place.
c. Operate tool with minimum amount of hydraulic hose in the water.
d. Insulate hydraulic reservoir.
e. Use dipsticktype heater in reservoir.
f. Install flexible electric heating panel on hydraulic reservoir.
Fluid temperatures exceeding ____F can damage equipment seals?
150F
Morgrip bolts are used on ___ and ___ class ships?
FFG 7 and CG 47 class ships.
CPP is controlled from the ______ or _______ ?
Bridge or engine room
When conducting a CPP blade removal, what condition should the ship try to achieve prior to blade removal.
Ensure that the ships has no more than 1 degree of list and minimum possible trim during the actual blade removal.
What position should CPP blades be set to prior to starting removal?
Blades should be set to the zero position.
What is used to dewater the blade bolt holes?
Hydrolube
If the bolt does not come loose, increase the pressure in ___ psi increments? DO NOT EXCEED ______ psi?
500 psi increments
37,500 psi.
What weight chain hoist are used for CPP blade removal?
3-ton
Shaft covering repairs: _____ shall be the first applied coating to the bare metal?
Primer
The second layer of shaft covering is a thin layer of _________ _______ _______?
polysulfide fairing compound
polysulfide fairing compound for shaft covering repairs shall set for a minimum of _____?
12hrs.
What NSTM covers Propulsion Shafting?
NSTM Chapter 243
At the conclusion of the shaft covering inspection, what is required to be done to all areas of the shaft with exposed bare metal?
The inspecting activity is required to apply HYCOTE. This is a temporary repair to retard corrosion.
During application of the GRP, the ideal temperature of the shaft and the immediate environment should be about ____F?
73F.
What is the purpose of waster sleeves inside sea chest?
Protection sleeves (ie. waster sleeves) are installed in sea chests to prevent galvanic corrosion of sea chest valves and piping components.
What are the two types of protection sleeves are encountered in large sea chests.
Retainer ring and Partial flange- They are differentiated by the manner in which they attach to the sea chests.
Ch16 Appendix D: What minimum size wire rope is allowed to be used for installing belly bands?
3/8”
How long after white water is achieved should you to continue to run the eductor?
Run the eductor for an additional 30 seconds to ensure that the interior of the patch is sufficiently evacuated and vented to atmospheric pressure.
What is the starting distance of an ICCP inspection?
20 ft
Divers working within 15 feet of an active system must wear?
A full dry suit, unisuit, or wet suit with hood and gloves.
When conducting a pre-deployment noise inspection, what is the distance between the propeller and rope guard?
1/4 to 1/2”.
For rope guard bolts, ensure that all screws are flush and staked how?
a minimum of two places opposite to each other (in accordance with reference h).
NSTM081: The ship shall be breasted out a minimum of ____ from the pier and clear on the outboard side. In the case of aircraft carriers, the ship shall be breasted out a minimum of ____?
Ships- 4 feet
Carriers- 20 feet
NSTM 081:There shall be sufficient depth of water under the keel, a minimum of ____ at Mean Low Water (MLW).
6 feet
NSTM081: When cleaning submarine propellers, what should not be used at the 3-inch area adjacent to the propulsor leading edges, trailing edges, tips, cusps, and fillets?
abrasive power tools or devices shall be used for cleaning
During masker emitter belt cleanings, what shall be done to the lance prior to operating it?
Place a highly visible marking applied 3’ from the tip of the lance.
NSTM081: The lance should be inserted into the cleanout opening at a rate of ___ ____ _____ until the lance has traveled _____’?
one foot per minute (FPM)five feet
While cleaning the masker emitter system, if more than ___percent of the holes are restricted, repeat the cleaning process?
5%
Do not attempt to clean PRAIRIE emitter holes without a minimum ____’ of of water below the lowest emitter hole?
10 feet
What are the two types of cleaning disc used for hull cleanings?
D3 & D5 extra coarse
What is the minimum lag bolt length for SRD repairs?
Minimum lag bolt length for any location is 2 inches.
Fairing compound should be applied in what air temperature?
Maintain an ambient air temperature between 80-90 oF. Allow a minimum of 12 hours for the fairing compound to cure.
Surface ship classes adhering to a dry dock periodicity of 10 years or less may omit the ____ and _____ layers?
first and second layers
Current waterborne repair methods for only the ____ layer, ____ layer and the _____ layer have been developed?
first (primer)
third layer (fairing compound)
fourth layer (GRP)
