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Dewatering Dewatering Equipment Equipment

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Dewatering Equipment. Enabling Objectives:. Identify the capabilities and uses of installed drainage Identify the capabilities and uses of portable dewatering equipment Rig and use a peri-jet eductor to dewater a flooded compartment. - PowerPoint PPT Presentation

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Page 1: Dewatering Equipment

Dewatering Dewatering EquipmentEquipment

Page 2: Dewatering Equipment

Enabling Enabling Objectives:Objectives:

Identify the capabilities and uses of Identify the capabilities and uses of installed drainageinstalled drainage

Identify the capabilities and uses of Identify the capabilities and uses of portable dewatering equipmentportable dewatering equipment

Rig and use a peri-jet eductor to Rig and use a peri-jet eductor to dewater a flooded compartment.dewater a flooded compartment.

Note: All objectives are in accordance Note: All objectives are in accordance with NSTM 079 Vol. 2, NWP 3-20.31, with NSTM 079 Vol. 2, NWP 3-20.31, COMNAVSURFPACINST 3541.4B, COMNAVSURFPACINST 3541.4B, COMNAVSURFLANTINST 3541.1C, COMNAVSURFLANTINST 3541.1C, NSTM Chapter 555, NSTM 079 Vol. 3 NSTM Chapter 555, NSTM 079 Vol. 3

Page 3: Dewatering Equipment

Drainage and Flushing Drainage and Flushing SystemsSystems

Definition: Systems of piping Definition: Systems of piping onboard ships, with or without onboard ships, with or without plumbing facilities, installed for plumbing facilities, installed for removing waste and flooding water removing waste and flooding water from within the hull. from within the hull.

Page 4: Dewatering Equipment

Principle Drainage Principle Drainage Systems:Systems: Main drainageMain drainage Secondary drainageSecondary drainage Plumbing and deck drainsPlumbing and deck drains

Page 5: Dewatering Equipment

Main drainageMain drainage Serves all main machinery spacesServes all main machinery spaces

• Note: On some ships, it may extend Note: On some ships, it may extend forward and aft of the machinery forward and aft of the machinery compartment.compartment.

Drains machinery space bilgesDrains machinery space bilges Drains floodable voidsDrains floodable voids Drains fuel tanks ballasted with sea Drains fuel tanks ballasted with sea

waterwater

Page 6: Dewatering Equipment

Main drainage (cont.)Main drainage (cont.) PumpsPumps

• Steam driven reciprocating (older Steam driven reciprocating (older ships)ships)

• Turbine or motor driven centrifugalTurbine or motor driven centrifugal• Eductors (jet pumps) Eductors (jet pumps)

Page 7: Dewatering Equipment

Secondary drainageSecondary drainage Drains spaces forward and aft of Drains spaces forward and aft of

the main machinery spacesthe main machinery spaces The secondary drainage system is The secondary drainage system is

an independent system with it’s an independent system with it’s own pumps and eductorsown pumps and eductors

Page 8: Dewatering Equipment

Secondary drainage Secondary drainage (cont.)(cont.) PumpsPumps

• Electrical motor driven centrifugalElectrical motor driven centrifugal• Eductors (jet pumps)Eductors (jet pumps)• Portable electric submersible pumpsPortable electric submersible pumps

Page 9: Dewatering Equipment

Plumbing and deck drainsPlumbing and deck drains Provided to drain compartments Provided to drain compartments

within the ship by gravity. Gravity within the ship by gravity. Gravity drainage piping is installed most drainage piping is installed most extensively in compartments extensively in compartments above the waterlineabove the waterline

Page 10: Dewatering Equipment

Weather deck drainsWeather deck drains Flooding danger exists with gravity Flooding danger exists with gravity

type drains. Such piping usually type drains. Such piping usually pierces the skin of the ship and pierces the skin of the ship and passes through the watertight passes through the watertight decks. As a damaged ship lists to decks. As a damaged ship lists to one side or settles more deeply, one side or settles more deeply, water will flow back through water will flow back through drainage piping.drainage piping.

Page 11: Dewatering Equipment

Overboard discharge Overboard discharge connectionconnection Allows for discharge of liquids through Allows for discharge of liquids through

the hull of the shipthe hull of the ship Located on the damage control deck Located on the damage control deck

and as close to the damage control and as close to the damage control deck as possibledeck as possible

Located on both port and starboard Located on both port and starboard sides, and through the hull of each sides, and through the hull of each main transverse subdivisionmain transverse subdivision

Made flush with the outer hull surfaceMade flush with the outer hull surface

Page 12: Dewatering Equipment

Overboard discharge Overboard discharge connection (cont.)connection (cont.)

Size and type:Size and type:• Inboard end has a 4 inch female Inboard end has a 4 inch female

swivel hose connection attached to a swivel hose connection attached to a 4 inch male-2 1/2 inch female swivel 4 inch male-2 1/2 inch female swivel hose adapter couplinghose adapter coupling

• A 2 1/2 inch hose cap is attached to A 2 1/2 inch hose cap is attached to the adapterthe adapter

Page 13: Dewatering Equipment

Drainage of magazinesDrainage of magazines All magazines having sprinkler All magazines having sprinkler

systems have drainage capabilitysystems have drainage capability Magazines located above and Magazines located above and

adjacent to the weather deck, adjacent to the weather deck, drain through a check valve drain through a check valve installed in the bulkhead to the installed in the bulkhead to the weather deckweather deck

Page 14: Dewatering Equipment

Drainage of magazines Drainage of magazines (cont.)(cont.) For magazines not located For magazines not located

adjacent to the weather deck, adjacent to the weather deck, overboard drainage is provided overboard drainage is provided through deck drains in the through deck drains in the magazine with independent drain magazine with independent drain piping having a check valve at the piping having a check valve at the shellshell

Page 15: Dewatering Equipment

Drainage of magazines Drainage of magazines (cont.)(cont.) Magazines which cannot be drained Magazines which cannot be drained

overboard by gravity are drained by overboard by gravity are drained by portable pumps, either through portable pumps, either through overhead access or a drain pipe overhead access or a drain pipe installed through the bulkhead to an installed through the bulkhead to an adjacent handling room, access, or adjacent handling room, access, or passage. The drain pipe is installed in passage. The drain pipe is installed in the bulkhead at a point close to the the bulkhead at a point close to the deck and fitted with a hose valvedeck and fitted with a hose valve

Page 16: Dewatering Equipment

Portable dewateringPortable dewateringequipmentequipment

Page 17: Dewatering Equipment

P-100P-100 The P-100 pump unit is an air cooled, The P-100 pump unit is an air cooled,

diesel driven, single cylinder, 10 diesel driven, single cylinder, 10 horsepower, portable pump. It’s horsepower, portable pump. It’s designed for fire fighting and designed for fire fighting and dewateringdewatering

The pump is designed to provide 100 The pump is designed to provide 100 GPM at 83 PSI while lifting 20 feet. In GPM at 83 PSI while lifting 20 feet. In high lift operations, it will deliver 71 high lift operations, it will deliver 71 GPM at 62 PSI while lifting 44 feetGPM at 62 PSI while lifting 44 feet

Page 18: Dewatering Equipment

P-100 equipmentP-100 equipment 3 inch suction hose3 inch suction hose Foot valve and strainerFoot valve and strainer Wye gateWye gate 1 1/2 inch fire hose1 1/2 inch fire hose Vari nozzleVari nozzle Exhaust hoseExhaust hose 1 1/2 inch Vita motivator 1 1/2 inch Vita motivator

Page 19: Dewatering Equipment

Portable electrical Portable electrical submersible pumpsubmersible pump

Either a 3 phase AC or a DC motor Either a 3 phase AC or a DC motor directly connected to a small, high directly connected to a small, high speed, water cooled centrifugal pumpspeed, water cooled centrifugal pump

Designed to dewater compartments not Designed to dewater compartments not served by installed drainage systemsserved by installed drainage systems

Designed to pump cool fresh water / sea Designed to pump cool fresh water / sea waterwater• DFM, JP-5, heavy oil, and Navy distillate can DFM, JP-5, heavy oil, and Navy distillate can

be pumped safely. Refer to owners manual be pumped safely. Refer to owners manual for pumping / cool down times for pumping / cool down times

Page 20: Dewatering Equipment

Sub pump capacitiesSub pump capacities 200 GPM at 50 foot static head200 GPM at 50 foot static head 140 GPM at 70 foot static head140 GPM at 70 foot static head Maximum suction lift of 20 feetMaximum suction lift of 20 feet Pumps may be used in tandem to Pumps may be used in tandem to

reduce the risk of pump damage reduce the risk of pump damage and to increase suction liftand to increase suction lift• Energize lowest pump firstEnergize lowest pump first

Page 21: Dewatering Equipment

Sub pump safety Sub pump safety precautionsprecautions

Operator must wear 7500 volt gloves when Operator must wear 7500 volt gloves when energizing pump.energizing pump.

Use the double braided nylon rope to raise Use the double braided nylon rope to raise and lower the pump. and lower the pump. NEVERNEVER use the use the electical cord!!electical cord!!

The pump can be operated safely with The pump can be operated safely with personnel in the space.personnel in the space.• 3 things must happen for electric shock to occur:3 things must happen for electric shock to occur:

– Motor must ground out, ground wire must be severed, Motor must ground out, ground wire must be severed, personnel must physically touch the pumppersonnel must physically touch the pump

Page 22: Dewatering Equipment

Sub pump safety Sub pump safety precautions (cont.)precautions (cont.)

Keep discharge hose free of kinks and Keep discharge hose free of kinks and sharp bends that will restrict flow. Back sharp bends that will restrict flow. Back pressure will rupture motor seals.pressure will rupture motor seals.

Always use strainer and keep it clear of Always use strainer and keep it clear of debris.debris.

Keep suction lift and discharge head as Keep suction lift and discharge head as low as possible.low as possible.

Keep the suction end of the pump in Keep the suction end of the pump in water while the pump is operating.water while the pump is operating.

Page 23: Dewatering Equipment

Portable eductorsPortable eductors Used for dewatering operations Used for dewatering operations

which involve petroleum products which involve petroleum products or any type of fuelor any type of fuel

Page 24: Dewatering Equipment

2 types of eductors2 types of eductors Peri jetPeri jet 1 1/2 x 2 1/2 single jet (s-type)1 1/2 x 2 1/2 single jet (s-type)

• Both are actuated through a fire hose Both are actuated through a fire hose by firemain pressure or from the by firemain pressure or from the discharge a P-100 pump.discharge a P-100 pump.

Page 25: Dewatering Equipment

Eductors (cont.)Eductors (cont.) Rule of thumb: The amount of Rule of thumb: The amount of

water you put into it is what you’ll water you put into it is what you’ll pump out of the space.pump out of the space.

ExampleExample• Water inlet to eductor is 100 GPMWater inlet to eductor is 100 GPM• Water removed from space is 100 GPM Water removed from space is 100 GPM • Total discharge is 200 GPMTotal discharge is 200 GPM

Page 26: Dewatering Equipment

Review and summaryReview and summary Types of drainageTypes of drainage

• Main drainageMain drainage• Secondary drainageSecondary drainage• Plumbing and deck drainsPlumbing and deck drains

Overboard discharge connectionsOverboard discharge connections Drainage of magazinesDrainage of magazines

Page 27: Dewatering Equipment

Review and summary Review and summary (cont.)(cont.) Emergency drainage equipmentEmergency drainage equipment

• Portable P-100 pumpPortable P-100 pump• Portable electric submersible pumpPortable electric submersible pump• Portable eductorsPortable eductors

– Peri jetPeri jet– S-typeS-type

Page 28: Dewatering Equipment

THE END!!!THE END!!!