307 Advanced DC Question and Answer
[2026] | UPDATED ACTUAL Exam |
Detailed Answer Explanations
• Under normal conditions, soundings of voids and tanks are made by -✓✓ The
sounding and security watch.
• During war conditions, a sounding detail is established -✓✓ In each repair party. (War
conditions)
• What leads to spaces or voids below decks -✓✓ Sounding tubes
• Signs of flooding from a sounding tube -✓✓ Air blowing out because water displaces
oxygen. A trickle of water appearing around the threads of the sounding cap indicates
that the compartment below is completely flooded
• Signs of fire from a sounding tube -✓✓ Air sucking in because fire needs oxygen to
fuel itself
• PROPER WAY TO TAKE SOUNDING -✓✓ Lower the plum bob until it taps the
bottom, reel back up, check for any liquid, if liquid is found, the sounding is UNSAT,
sound 2 more times. If no presence of liquid is found, the sounding is SAT.
• TYPES OF PATCHES -✓✓ E.W.A.R.P., BANDING PATCH, JUBILEE PATCH, RAPID
RESPONSE CLAMP, SOFT PATCH,
• E.W.A.R.P. -✓✓ EMERGENCY WATER ACTIVATED REPAIR PATCH
• E.W.A.R.P. details -✓✓ Rated at 150 PSI, 2 sizes- 4X15 & 2X5, fiberglass tape
covered by resin, RUPTURED PIPE MUST BE ISOLATED, Water activated for 20
seconds. 30 minutes to harden, cannot be used on JP-5/Fuel and potable water
systems or systems with operation temperatures that exceed 300˚F
• BANDING PATCH details -✓✓ Rated at 150 PSI, used for temporary emergency pipe
patching for LP pressure piping system, utilizes strong back plate tightened down by ½
inch stainless steel strapping
• BANDING TOOL KIT -✓✓ 2 ball peen hammers, 4 chain wrenches, 2 pairs of cut
resistant gloves, Strapping dispenser w/ metal strapping, Banding seals, Banding tool, 3
types of metallic strong backs
, • JUBILEE PATCH details -✓✓ Rated at 100 PSI, consists of sheet metal rolled into a
cylinder and shaped at the gap that the two ends are really flanges, every repair locker
contains assorted sizes, System isolation is not needed
• RAPID RESPONSE CLAMP details -✓✓ 8 different sizes that vary from 38mm to
980mm. Rated at 294 PSI
• SOFT PATCH details -✓✓ Rated at 150 PSI, sheet rubber, marline, wooden wedges
and oakum, insert wedge into rupture, draw a line where flush with the pipe, cut wedge
½" below marked line, line the rupture or wrap end of wedge with oakum, Hammer in
wedge, cut to where it's flush with the pipe, wrap rubber gasket, gasket should go 2"
past both ends of crack, and a ¼" gap at back/bottom, Wrap marlin around, start in
center by tying off a 6-12" tail, wrap marlin 2" past gasket on one end, back to center,
go 2" past the other end and back to center.
• PIPE PATCHING KIT -✓✓ Hacksaw blades, Hacksaw frame, 2 pairs of cut resistant
gloves, Machinist hammer, Half hatchet, Marlin on wooden dowel, Oakum, 3 different
size plugs, 4 different size wedges, 2 sizes of E.W.A.R.P., Rubber sheet,
• PIPE JUMPER HOSE SYSTEM (PJHS) details -✓✓ Located in Repair locker 1F, used
for temporary emergency cold pipe repairs in minutes so piping gets back in service
quickly, Permanent repairs can then be made at a more convenient time and place,
Used on hydraulic line, chilled water lines, fuel lines, fire protection systems, firemain
and compressed air systems.
• PLUGGING details -✓✓ The simplest method to repair small holes is to use wooden
plugs made of soft wood. Plugs should not be painted, unpainted soft wood absorbs
more water and grips better, it's best to wrap plugs with lightweight cloth prior to
insertion. The cloth will help plugs grip better and also fills gaps between plugs,
Mattresses, pillows, and blankets can be used to plug a hole.
• BOX PATCH details -✓✓ Put over a shell hole from inside the ship and held in place
with shoring, can stuff the box with pillows or lay pillow over hole before applying box
patch, Can also stuff rags and wedges into holes between the box and hull.
• SHORING The process of -✓✓ placing supports against the side of, beneath or above
a structure to prevent metal fatigue, sagging and bulging
• Best way to temporarily support structure until more permanent measures are possible
-✓✓ Shoring
• SHORING OBJECTIVES -✓✓ To reinforce straining bulkheads, doors and hatches
against abnormal pressures, To support damaged and weakened structures and fittings
• SYMPTOMS OF STRAINS ON STRUCTURES -✓✓ Panting, buckling, bulging, frature
[2026] | UPDATED ACTUAL Exam |
Detailed Answer Explanations
• Under normal conditions, soundings of voids and tanks are made by -✓✓ The
sounding and security watch.
• During war conditions, a sounding detail is established -✓✓ In each repair party. (War
conditions)
• What leads to spaces or voids below decks -✓✓ Sounding tubes
• Signs of flooding from a sounding tube -✓✓ Air blowing out because water displaces
oxygen. A trickle of water appearing around the threads of the sounding cap indicates
that the compartment below is completely flooded
• Signs of fire from a sounding tube -✓✓ Air sucking in because fire needs oxygen to
fuel itself
• PROPER WAY TO TAKE SOUNDING -✓✓ Lower the plum bob until it taps the
bottom, reel back up, check for any liquid, if liquid is found, the sounding is UNSAT,
sound 2 more times. If no presence of liquid is found, the sounding is SAT.
• TYPES OF PATCHES -✓✓ E.W.A.R.P., BANDING PATCH, JUBILEE PATCH, RAPID
RESPONSE CLAMP, SOFT PATCH,
• E.W.A.R.P. -✓✓ EMERGENCY WATER ACTIVATED REPAIR PATCH
• E.W.A.R.P. details -✓✓ Rated at 150 PSI, 2 sizes- 4X15 & 2X5, fiberglass tape
covered by resin, RUPTURED PIPE MUST BE ISOLATED, Water activated for 20
seconds. 30 minutes to harden, cannot be used on JP-5/Fuel and potable water
systems or systems with operation temperatures that exceed 300˚F
• BANDING PATCH details -✓✓ Rated at 150 PSI, used for temporary emergency pipe
patching for LP pressure piping system, utilizes strong back plate tightened down by ½
inch stainless steel strapping
• BANDING TOOL KIT -✓✓ 2 ball peen hammers, 4 chain wrenches, 2 pairs of cut
resistant gloves, Strapping dispenser w/ metal strapping, Banding seals, Banding tool, 3
types of metallic strong backs
, • JUBILEE PATCH details -✓✓ Rated at 100 PSI, consists of sheet metal rolled into a
cylinder and shaped at the gap that the two ends are really flanges, every repair locker
contains assorted sizes, System isolation is not needed
• RAPID RESPONSE CLAMP details -✓✓ 8 different sizes that vary from 38mm to
980mm. Rated at 294 PSI
• SOFT PATCH details -✓✓ Rated at 150 PSI, sheet rubber, marline, wooden wedges
and oakum, insert wedge into rupture, draw a line where flush with the pipe, cut wedge
½" below marked line, line the rupture or wrap end of wedge with oakum, Hammer in
wedge, cut to where it's flush with the pipe, wrap rubber gasket, gasket should go 2"
past both ends of crack, and a ¼" gap at back/bottom, Wrap marlin around, start in
center by tying off a 6-12" tail, wrap marlin 2" past gasket on one end, back to center,
go 2" past the other end and back to center.
• PIPE PATCHING KIT -✓✓ Hacksaw blades, Hacksaw frame, 2 pairs of cut resistant
gloves, Machinist hammer, Half hatchet, Marlin on wooden dowel, Oakum, 3 different
size plugs, 4 different size wedges, 2 sizes of E.W.A.R.P., Rubber sheet,
• PIPE JUMPER HOSE SYSTEM (PJHS) details -✓✓ Located in Repair locker 1F, used
for temporary emergency cold pipe repairs in minutes so piping gets back in service
quickly, Permanent repairs can then be made at a more convenient time and place,
Used on hydraulic line, chilled water lines, fuel lines, fire protection systems, firemain
and compressed air systems.
• PLUGGING details -✓✓ The simplest method to repair small holes is to use wooden
plugs made of soft wood. Plugs should not be painted, unpainted soft wood absorbs
more water and grips better, it's best to wrap plugs with lightweight cloth prior to
insertion. The cloth will help plugs grip better and also fills gaps between plugs,
Mattresses, pillows, and blankets can be used to plug a hole.
• BOX PATCH details -✓✓ Put over a shell hole from inside the ship and held in place
with shoring, can stuff the box with pillows or lay pillow over hole before applying box
patch, Can also stuff rags and wedges into holes between the box and hull.
• SHORING The process of -✓✓ placing supports against the side of, beneath or above
a structure to prevent metal fatigue, sagging and bulging
• Best way to temporarily support structure until more permanent measures are possible
-✓✓ Shoring
• SHORING OBJECTIVES -✓✓ To reinforce straining bulkheads, doors and hatches
against abnormal pressures, To support damaged and weakened structures and fittings
• SYMPTOMS OF STRAINS ON STRUCTURES -✓✓ Panting, buckling, bulging, frature
