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20 Cards in this Set
- Front
- Back
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What are the 2 types of plugs used in UWSH?
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-Wooden damage control (DC) plugs
-Mechanical Expandible plugs |
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When plugs are installed on the vertical sides of the hull (above the bilge keel or turn of the bilge), what is perfered over tag lines?
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Bellybands can help to secure the plug in addition to locating the plug.
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T or F, installation of an internal sealing blank in combination with a closed sea chest valve meets the double-valve protection requirement without a diver installed plug?
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true
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What must be approved and followed when any diver installed plug serves as the primary or secondary barrier to the sea?
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FWP, including the patch and plug inspection sheet and the patch and plug installation checksheet that has been approved by the RA and the ships CO or his disignated rep.
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Who must be notified prior to the installation of a plug?
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The CO or his disignated representative shall be notified of the location of the plug and level of protection provided (single or double protection).
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Who signs off the patch and plug inspection checksheet approving the inspection and where shall it remain on file while the device is installed on the vessel?
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Dive supervisor signs the inspection checksheet and it remains on file at the installing activity.
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How long shall divers remain on dive station?
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Until double valve protection is established, repairs are completed or ship's CO or his designated representative permission is granted.
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What must be stamped on the end plate or waterproof tag of a mechanical expandable plug?
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Size range
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Mechanical plugs must have a seated presure rating of what?
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At least 1 1/2 times the static pressure head it will seal.
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Due to the potential of galvanic corrosion, mechanical plugs with ________ components are not authorized?
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Aluminum
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T or F, tapered mech. plugs are authorized for UWSH?
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False, they tend to dislodge during the tightening process.
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What is required to verify the integrity of the plug upon installation and prior to removal?
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Communication protocol with the on-site repair personnel.
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How do you verify a positive seal has been made after a plug has been installed?
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Have SF open a bleed valve installed in the system, or slowly loosen an internal flange.
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What is the maximum a DC plug may protrude from the opening after it has been installed?
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3 to 4 inches
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What are used on DC plugs as a sealing compound?
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Binsuke
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How are hull openings identified and located on submarines?
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SF must identify the location by use of a weighted line hung over the side at the correct frame location. 2 independent DV must verify the correct hul opening is being patched or plugged by returning an onboard tapping signal.
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What is the minimum size wire rope used for bellybands?
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3/8" wire rope
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How are leak checks conducted on the plug by the DV?
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By releasing air bubbles around the perimeter of the plug.
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Who must be notified on submarines prior to breaking loose fastners to confirm plug seal?
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The CO
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What must be verified on all internal installed sealing blanks?
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A less than 1/2 inch diameter vent valve
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