Dewatering Dewatering EquipmentEquipment

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

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.

Principle Drainage Principle Drainage Systems:Systems:

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

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 Drains fuel tanks ballasted with

sea watersea water

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)

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

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

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

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.

Overboard discharge Overboard discharge connectionconnection

Allows for discharge of liquids Allows for discharge of liquids through the hull of the shipthrough the 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

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

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

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

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

Portable dewateringPortable dewateringequipmentequipment

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

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

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 / Designed to pump cool fresh water / sea watersea water• 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

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

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 3 things must happen for electric shock to

occur: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

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.

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

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.

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

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

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

THE END!!!THE END!!!