BILGE WATER SEPARATION RELIABLE, POWERFUL, ECONOMICAL

MULTI-PHASE EMULSION BREAKER MPEB

SYSTEMATIC FILTRATION MAHLE INDUSTRIEFILTRATION

AND SEPARATION

Decades of experience and innovation

MAHLE’s global success is driven by products

MAHLE Industriefiltration has been developing

that are perfectly tailored to meet our cus-

and building advanced filtration and separation

tomers’ requirements, products which deliver

technology for over 50 years. Our leading sys-

unsurpassed cost-effectiveness due to their

tems are used in a wide range of industrial

modular design. Ten of the world’s top 15 ship-

applications and in power plants, civil and mili-

building companies and the world’s three

CONTENT

tary shipbuilding. Our systems are used wher-

largest shipyards equip their ships with our

What is bilge water?

4

ever the focus is on operational safety, quality

environmentally friendly, high quality systems,

and environmental protection.

placing their trust in the outstanding operating

Towards cleaner oceans

6

The MPEB bilge water separators

8

security of MAHLE Industriefiltration system. MAHLE Industriefiltration is part of the MAHLE Group, one of the 30 largest automotive suppli-

Constant quality and safety

ers in the world and the world leader in compo-

MAHLE Industriefiltration supplies highly effi-

nents and systems for combustion engines and

cient, customised solutions for a wide range of

peripherals.

applications: Bilge water deoiling

The MPEB: A uniquely simple concept 10 Conventional technologies versus MPEB 12

Own developments based on efficient

Ballast water treatment

Simple, compact design

14

modular designs

Cooling lubricant and detergent processing

Flow diagram

16

Increasingly tough environmental regulations

Industrial waste water cleaning

pose welcome challenges for MAHLE’s highly

Separation technology for the oil industry

skilled and inspired development engineers,

Oil and fuel treatment for engines, turbines

who use their broad expertise with systematic

and gears; heavy oil filtration

innovation to produce results. These are eviden -

Protection for hydraulic systems, pipelines,

ced by our numerous patents for core technol-

transfer and circulation systems

Benefits for shipyards and shipowners, Retrofitting, Documentation, Approval 18

ogy elements and our diverse range of products that make an important contribution to ad -

This comprehensive portfolio is rounded off by

vanced process and environmental engineering.

customer support services precisely tailored to our customers’ needs, including retrofitting and the integration of new units.

3

WHAT IS BILGE WATER? MORE THAN A COMPLICATED MIXTURE

What is bilge water?

Stable emulsions in bilge water

Bilge water is the result of leakages, of de -

Separation of oil and particles from bilge water

watering processes from sedimentation

and

is becoming increasingly challenging, due to

sludge tanks and of drains from different clean-

the presence of stable emulsions and suspen-

ing systems. Bilge water collects in a ship’s

sions. Emulsion and suspension formation and

bilge wells, which are located in the lowermost

stability are of major concern in the context of

part of the vessel just about the hull.

bilge water treatment.

The definition of bilge water is thus much wider

By definition, an emulsion is a mixture of two

in scope than merely the contents of a ship’s

immiscible liquids. An oil-in-water emulsion

bilge. In simple terms, bilge water contains two

consists of small oil droplets dispersed in a

types of substreams:

continuous water phase. A suspension is a

Flows that are reasonably continuous and

mixture in which solid particles are dispersed in

predictable, and,

the con tinuous water phase. Emulsions, or

Flows that are intermittent in nature and diffi-

small droplets of one liquid (the dispersed

cult to foresee.

phase), can form in the other liquid (the continuous phase) under agitation, such as during

The first category includes water from the separa-

pumping or throttling in valves. Droplets of oil

tor sludge tank and water from cleaning activities

dispersed in water generally coalesce, or com-

in the ship’s engine room. The second category

bine, into larger droplets because oil is not sol-

may include soot water, leakage and incident

uble in water.

spills from tanks and machinery spaces. Increasing the droplet size helps facilitate sepBilge water is thus composed of a mixture of

aration. The presence of surfactants, such as

water, detergents and other chemicals, fuel oil,

detergents, soaps and other surface-active

lubricating oil, hydraulic oil, catalytic fines, oil

compounds, however, may contribute to stabil-

additives, soot and dirt. This mixture is collect-

isation of small oil droplets. This makes separa-

ed in the bilge water holding tank, which gen-

tion very challenging.

erally is maintained at an elevated temperature. This high temperature facilitates primary separation due to the force of gravity in the bilge water tank and preferably is of the two- or three-stage type. Oil rises to the top of the tank while particles settle to the tank bottom, generally dividing the bilge water into three distinct layers in the tank: Top layer. This contains most of the oil and organic solvents and constitu tes a small portion of the total tank volume. Skimming this top layer for separate treatment is recommend ed. Middle, or main, layer. This aqueous phase contains water polluted by oil, chemicals and particles in emulsified form. This is fed to the bilge water treatment system. Bottom layer. This contains solids and heavy sludge, which should also be removed for separate treatment.

5

The use of chemicals on board for cleaning and

Usage of chemicals always causes some type of

main tenance, treatment of water, fuel and lube

compromise between cleaning efficiency and sep-

oil conditioning contributes to the stabilisation

aration efficiency on the one hand and environ-

of emulsions. Most chemical manufacturers

mental friendliness on the other. MAHLE Industrie-

claim that their products do not stabilise emul-

filtration strongly recommends the use of quick-

sions in bilge water. But the utilisation of sur-

separating, environmentally friendly and non-toxic

face-active chemicals can cause many prod-

detergents. Choosing chemicals that are compa-

ucts to contribute to the formation of stable

tible, non-toxic, biodegradable and non-emulsify-

emulsions.

ing, helps prevent problems downstream.

TOWARDS CLEANER OCEANS A MAJOR ENVIRONMENTAL CONCERN FOR THE SHIPPING INDUSTRY

Current international legislation mandates that

Bilge water legislation

the bilge water that is discharged directly into

Bilge water treatment is an environmental appli-

the ocean by ships should contain no more

cation that must meet the stringent require-

than 15 parts per million of residual oil in water.

ments of international legis lation. Disposal of untreated bilge water into our oceans is strictly

Regardless of its source, bilge water must be

prohibited by international law and subject to

treated to reduce the oil content to levels that

heavy fines, especially in sensitive waters.

meet international and national regulations for

Current MARPOL legis lation stipulates that

release into the environment. This is critical to

separated bilge water containing no more than

keeping the world’s oceans and their vast

15 ppm oil in water can be discharged into

marine ecosystems healthy and productive.

international waters. Some national, regional and local authorities have more stringent regu-

Efficient bilge water treatment minimises the

lations.

impact of ship propulsion on the marine environment as well as the heavy fines that ship

The International Maritime Organization (IMO)

operators can face for pumping oily bilge water

Resolution MEPC.107(49) specifies how to

overboard. Efficient treatment also reduces the

type approve equipment used on board ships.

need for and cost of waste disposal on shore.

The NFV separators comply with the Eu ropean Marine Equipment Directive, MED 2002/75/EC.

Over the years, waste disposal costs have con-

Many manufacturers of bilge wa ter separators

tinued to climb as local authorities enforce

have succeeded in meeting the specified

stricter laws for the land-based companies that

requirements for equipment certification, but

process this waste.

much of this equipment falls short of delivering the high separation efficiency required under real operating conditions.

6

Enforcement Enforcement of bilge water regulations is now

In 2004, French authorities levied a €250,000

much more aggressive than before, thanks to

fine against the captain and owner of a cargo

technological developments making the detec-

vessel that left a 6.5 km-long oil slick in its

tion of illegal discharges possible. Authorities

wake off the coast of Brittany due to a mal-

around the world are pursuing the prosecution

functioning bilge separator. In another case,

of vessel owners, operators, crewmembers,

two chief engineers who worked for a shipping

and shoreside employees who are involved in

company with its headquarters in the British

illegal discharges at sea for any criminal activity.

Virgin Islands were sentenced to two years of probation and fined for their roles in concealing

Port State Control Authorities carry out inspec-

the discharge of oily wastewater from their

tions, which include a visit on board a ship in

ship. Yet a third case against a U.S. shipping

order to check that the overall condition of the

company that pled guilty to covering up an ille-

ship, including bilge water treatment equipment

gal oil discharge resulted in a $4.2 million fine.

and oil record log books, meets generally accepted international rules and standards.

Criminal prosections related to the illegal discharge of oily bilge water continue.

In the absence of valid certificates or documents or if there are clear grounds for believing that the condition of a ship or of its equipment is in violation of international regulations, further investigation is conducted. Heavy fines are levied against violators not only for crewmembers but senior shipping executives as well, and penalties are increasing in severity, often including prison.

7

THE MULTI-PHASE EMULSION BREAKER

BILGE WATER SEPARATORS

MPEB® is a trademark owned by MAHLE Industriefiltration. The company reserves the right to make changes at any time without prior notice.

The cleaning of bilge water poses distinct

Overview

challenges

The NFV Multi-Phase Emulsion Breaker MPEB

Not only does the composition and flow of bilge

is the collective name for a series of continuous

water constantly change, making continuous

bilge water separators for the treatment of bilge

and efficient treatment difficult, but treatment

water at sea.

on board also presents another set of constraints.

The MPEB is easy to install for any new or exis -

Treatment methods must meet the individual

viron ment Protection Committee Re solution,

requirements of shipowners for safety, reliabi lity

MEPC.107(49), of the Interna tio nal Ma ritime

and automation as well as the specific design

Or ga nization (IMO).

ting installation. It complies with the Ma rine En -

of the ships. In addition, performance of the treatment system can vary depending on the oil

The MPEB separators use patented two-stage

content and the size of the droplets and parti-

separation technologies to remove contami-

cles present in the water and on various oper-

nants from the bilge water. These systems do

ating conditions.

not require backflushing or the use of any che micals, absorption processes, or absorption or membrane filters. A range of capacities be tween 0.25 m 3 and 10 m 3 per hour is available.

8

MPEB: Standard configuration, capacities and dimensions Type

Configuration

Flow rate (m3/h)

Size, including service space L × W × H (mm)

Weight (kg)

1.0

2500 × 1200 × 1400

550

2.5

3000 × 1300 × 1800

650

5.0

3400 × 1500 × 2000

1000

10.0

3400 × 1500 × 2000

1050

MPEB (Single system)

First stage

Second stage

MPEB-VT

0.25

1600 × 1000 × 1100

700 × 500 × 1400

250

(Divided system)

0.5

1600 × 1100 × 1300

700 × 500 × 1400

300

1.0

2000 × 1200 × 1400

700 × 500 × 1800

390

2.5

2600 × 1300 × 1800

1100 × 1000 × 1800

630

5.0

3100 × 1700 × 2000

1200 × 1100 × 2200

1030

10.0

3100 × 1700 × 2000

1200 × 1100 × 2900

1170

0.25

1500 × 900 × 1150

400

0.5

1600 × 1700 × 1300

520

1.0

1600 × 2000 × 1500

600

2.5

2700 × 2300 × 1800

900

5.0

2800 × 2800 × 2000

1250

10.0

2800 × 2800 × 2000

1300

MPEB Deoiler 2000 (Dual system)

System benefits

References Hundreds of MPEB units approved according to the latest IMO Resolution MEPC.107(49) are now installed on ships belonging to renowned shipowners, many of whom are returning customers who relied on previous generations of the system.

Standard sizes

Compact, modular, flexible design. Three

The MPEB from MAHLE Industriefiltration is

mo dels, two pump options and several differ-

available in three models:

ent sizes are available. Customisation is also

MPEB: Single system, in one pressure vessel.

avail able upon request.

MPEB-VT: Divided system, in two individual

Easy to operate. Simply start the system and

pressure vessels. Suitable for retrofit installa-

leave it running. By connecting the system to

tions.

a level switch in the bilge water tank, the

MPEB Deoiler 2000: High-performance dual

MPEB will auto matically start.

system, in two pressure vessels built together.

No moving parts. The MPEB does not have any moving parts and generally operates at

Delivery options

ambient temperature .

Different

delivery pump

options to

are

facilitate

offered:

Lower operating costs. The MPEB reduces

Built-on

installation.

operating costs by eliminating the need for

Separate feed pump to minimise suction

chemicals, absorption processes, membrane

head where required.

filters and backflushing. Technical support. All spares, service and sales engineers are available through an international service network.

9

Working principle The MPEB continuously separates oil, emul-

In the first stage, the NFV Multi-Phase Se pa r a -

sions and dispersions from water without back-

tor MPS uses patented profiles to separate oil

flushing or the use of chemicals. However,

and solids from the bilge water.

because the MPEB has a self-cleaning function, it effectively overcomes the challenges of

In the second stage, the NFV Mechanical Emul -

What makes the MPEB a uniquely simple concept?

using absorption filters.

sion Breaker MESB separates fine emulsified oil

In addition to its simple working principle, it is simple to operate, simple to maintain, simple to install, and, simple to commission.

The MPEB provides con tinuous pressure-type

ments. Separated oil is discharged to a waste

separation in two stages using the principles of

oil tank. An oil-in-water monitor measures the

gravity and coalescence to separate oil and

residual oil content before cleaned water is dis-

solid particles from the bilge water.

charged overboard.

droplets using patented emulsion breaker ele-

A UNIQUELY SIMPLE CONCEPT TO COMPLY WITH THE MEPC.107(49) STANDARD

MPS: Patented wave-type profiles of oleophilic material are stacked one on top of the other. Ten to fifteen rows of profiles, depending on separator size, are placed in an insert.

1 st stage:

top of the profiles, pass through the openings

NFV Multi-Phase Separator MPS

and flow onward to the oil dome. As the

The helical rotary pump transfers the oily water

droplets rise, any solid particles that are sus-

mixture from the bilge water settling or collect-

pended in the droplets separate from the oil

ing tank into the MPEB separator, where larger

due to the difference in the densities between

oil drops and solids are pre-separated by grav-

the oil and the solids. The particles drop onto

ity and a good amount of oil instantly flows

the profile below, sliding off the profile edges to

upward into the oil collecting dome.

the bottom of the separator, where they are drained into the sludge tank.

After that, the oily water mixture flows through the patented Multi-Phase Separator MPS whe re

The oil collected in the oil dome during this first

it is led through a parallel arrangement of wave-

stage is automatically drained into the sludge/

type profiles (see figures for first stage on the

waste oil tank via the discharge valve, which is

lower left-hand side of page 9).

acti vated by a signal from the level electrode

Small droplets of the lighter discontinuous

loca ted in the oil dome.

phase (oil) collect at the lower edges of the proMicrofibre bed element. The second stage consists of between two and twelve elements, depending on the size of the separator.

10

files due to the combined effects of gravity, flow

After passing through the Multi-Phase Sepa -

and coalescence. The small oil droplets coa-

rator, the oily water mixture is directed onward

lesce to form larger droplets as they collect

to the Mechanical Emulsion Breaker, which

underneath the profiles, where they float to the

comprises the second stage of the system.

1 st stage

2 nd stage

1

1. 2. 3. 4.

3

2

4

Small oil droplets collect at the lower edge of the profiles and coalesce into larger droplets. These droplets flow upward into the oil dome, where it is collected and drained into the waste oil tank.

Coalescing effects in the microfibre bed which consists of various layers of different types of micrometre thin fibres of a special oleophilic material (a material that “loves” oil).

2 nd stage:

The fine droplets of oil collect between the fila-

NFV Mechanical Emulsion Breaker MESB

ments of the microfibre and form a wetting film.

The MESB processes the oily water from the

The oil proceeds along with the continuous

MPS. This stage utilises patented Emulsion

phase (water) to the outer periphery of the

Breaker elements to separate fine emulsified oil

micro fibre bed where the liquids pass through a

droplets which remain in the bilge water after the

sleeve, which contributes to the formation of

first stage of processing. The main principle of

larger drops of oil. The drops of oil rise inter-

separation utilised in this stage is coalescence.

mittently upward and onward into the oil dome of this second stage. The oil collected in the

In the microfibre bed, the separation of oil from

second oil dome is automatically drained into

water is possible even when the difference in

sludge/waste oil tank via the discharge valve.

density between the two liquids is minute (see figures for the second stage above).

Screen effective Flow collision Interception Inertial impaction

The sampling point for the oil-in-water monitor is located in the clean water outlet of the sec-

The oily water enters the Mechanical Emulsion

ond stage. The separation result is continuous-

Breaker through a perforated pipe and passes

ly monitored. If the separation result is less than

through a microfibre bed where the principles

or equal to 15 ppm, the cleaned water is direct-

of filtration, collision, interception and inertial

ed for discharge overboard. If the result is

impaction contribute to the formation of larger

greater than 15 ppm the bilge water is re-circu-

oil droplets.

lated back to the bilge water tank.

Operation and maintenance Simply start or stop the pump to operate the unit. As an option, the unit may also be configured to operate automatically by using level switches in the bilge holding tank to start the pump. Maintenance is easy and convenient. The NFV MultiPhase Separator elements (first stage) must be cleaned on occasion about once a year, but no replacement is necessary. NFV Mechanical Emulsion Breaker elements (second stage) require replacement when the differential pressure reaches the set point or about every two years.

11

SIGNIFICANT ADVANTAGES MPEB VERSUS CONVENTIONAL TECHNOLOGIES

Conventional gravity (static) oil separators on

Absorption filters

board most vessels sailing the oceans today

Many suppliers have added absorption filters

are unable to meet the requirements of the IMO

after the gravity oil separators in order to meet

Reso lu tion MEPC.107(49). These systems were

MEPC.107(49) requirements. These inline ab -

designed to handle the requirements for effi-

sorp tion filters are sometimes designed to last

cient separation under the IMO Resolution

not much more than the 2.5 hour duration of

MEPC.60(33) which went into effect in 1993.

the IMO MEPC.107(49) test for the handling of emulsions and dispersions. For example, for a

For systems to be approved according to

2.5 m 3 /h system of 27 kg of oil must be

MEPC.60(33) the systems were tested with dif-

absorbed during the 2.5 hours if 50 percent of

ferent mixtures of oil and water. These simple

the emulsified oil is to be taken up in the

gravity separators have difficulties in many

absorption stage.

cases when confronted with the emulsified bilge water that is often produced on board.

If the absorption filters are optimised in this way

That’s why the new MEPC.107(49) specifies

for the 2.5 hour IMO test, the filters then quick-

that bilge water separators must also be tested

ly tend to reach their design capacity, become

with an emulsion. The test emulsion is com-

saturated and require immediate replacement.

posed of a mixture of water, heavy fuel oil, gas

However, because the composition of bilge

oil, tensides and fine iron oxide particles.

water varies, there isn’t any scientific way to an ti cipate when the initial breakthrough of oil

Cross section of absorption elements: New (above) and after 2.5 hour emulsion test according to IMO procedures (beyond).

12

To fulfil the new rules most bilge water systems

may occur. An alarm triggered by the oil-in-

now have added a second stage downstream

water monitor is the first indication to the oper-

in order to meet the requirements of handling

ator that something is wrong.

emulsions

and

dispersions

according

to

MEPC.107(49). This second stage is of differ-

This means that the service life of the filter will

ent types:

be short under actual operating conditions,

Comparison with conventional technologies

Principle of other make

Comment

MPEB

Suction-type system

Often requires a second pump before the system due to limited pump suction height. Requires the bilge separator and the bilge water holding tank to be close to or at the same level. Requires the interruption for cleaning with fresh water.

Pressure-type system

Backflushing systems

Generates a lot of waste oil with high water content, and thus high waste disposal costs. Lowers actual capacity to less than that of nominal capacity. Chemicals Absorption filter

Active carbon bed

Creates waste by contributing approximately 15 to 25 percent of the content of bilge water that requires disposal on shore. Requires frequent replacement before the filter reaches its saturation point, thus increasing operating costs. Can cause oil to be released into the system if the filter is not replaced before reaching its saturation point. Does not provide an adequate filtering effect since active carbon beds are primarily used to purify drinking water systems and not to filter oil from wastewater.

Continuous operation and no backflushing required

No chemicals required No absorption filter required

No active carbon bed required

Requires feed to contain less than 10 to 20 ppm to obtain acceptable product life cycle. Is sensitive to solids. Requires frequent replacement and disposal. Is labour intensive, requiring more man hours for maintenance.

even if real bilge water rarely has the amount of

Chemicals

emulsions and dispersions as the bilge water

Another solution for a second stage down-

used for the IMO test.

stream is the addition of a chemical separation plant and additional filters filled with sand,

Whatever the interval, the filter elements may

granulate and/or activated carbon. This solu-

require frequent re place ment, which in the case

tion, however, is a costly, labour-intensive alter-

of activated carbon filters is a dirty process that

native that generates a lot of waste. Between

requires special handling and disposal which

15 and 25 percent of the treated bilge water

can be expensive.

must be pumped ashore, which is an expensive pro cess in many ports, and sent to a land-

Backflushing

based plant for further processing.

Most conventional gravity oil separators use intermittent backflushing sequences to clean the system. Intermittent backflushing, however, reduces the nominal capacity of the separator because it requires water for cleaning to be pumped at designated intervals into the system.

Typical layout of conventional suction coalescer with absorption filter supplied by other manufacturers.

The backflushing water may contain be tween 70 and 80 percent waste oil. Back flushing increases the overall consumption of water on board. It also increases the volume of water that is discharged to the waste oil tank, thus generating an increased volume of sludge for onshore disposal.

13

MPEB-VT 5

SIMPLE, COMPACT DESIGN FOR THE BEST USE OF AVAILABLE SPACE

The MPEB bilge water separators are available

2 nd stage:

in different designs, sizes and capacities. This

NFV Mechanical Emulsion Breaker MESB

enables flexibility in both design and configura-

The Mechanical Emulsion Breaker consists of a

tion to enable shipbuilding companies to imple-

chamber with patented emulsion breaker ele-

ment effective, creative solutions.

ments for the separation of fine emulsified oil droplets and a pump, heater and oil dome to

st

1 stage:

collect separated oil.

NFV Multi-Phase Separator MPS The Multi-Phase Separator consists of an insert

The Mechanical Emulsion Breaker has the fol-

with patented wave-type profiles for the sepa-

lowing auxiliary parts:

ration of oil and solid particles from the bilge

Automatic oil drain with level electrode and

water and a pump, heater and oil dome to col-

pneumatic operated oil discharge valve,

lect separated oil.

Control cock at the oil collection dome, Differential pressure switch with electric con-

14

The Multi-Phase Separator also has the follow-

tacts,

ing auxiliary parts:

Pressure gauge,

Automatic oil drain with level electrode and

Solenoid valve for scavenger line,

pneumatic operated oil discharge valve,

Spring loaded non-return valve,

Control cock at the oil collection dome,

Pneumatically operated three-way valve in the

Safety valve,

outlet to re-circulate separated bilge wa ter if

Pressure gauge, and,

residual oil content exceeds 15 ppm, and,

Solenoid valve for scavenger line.

Manual three-way valve for harbour test.

Key components

which opens a valve to release the oil that has accumulated in the dome into the waste oil

Dry-run pump protection

tank. Manual operation is also possible.

For built-on pumps: The level electrodes in the oil domes cause both the oil discharge valve and

Sludge drains

the solenoid valve of the scavenger line that is

Sludge drains are located at the bottom of each

affected to open for a pre-set interval. The scav-

separation chamber to transfer sludge collect-

enger line serves as the source of priming fluid.

ed during the separation process to the sludge

If the pre-set interval is exceeded, the pump

tank of the ship.

automatically shuts off and an alarm is activated. Differential pressure switch For pumps installed separately: An electronic

A differential pressure switch monitors the

Dry Running Protection Device (TSE) uses a

pres sure drop across the microfibre bed ele-

temperature sensor installed in the pump stator

ments in the second stage. If the differential

to provide protection. When the pump runs dry,

pressure exceeds the maximum allowable va-

the valve in the suction line automatically clos-

lue, the unit automatically switches off and the

es and the scavenger line transfers priming

control cabinet indicates that the elements

fluid (in this case, bilge water) out of the MPEB

must be replaced.

and into the pump. Control cabinet Patented inserts

Mounted directly on the MPEB, the control

Stacked in the Multi-Phase Separator, wave-

cabinet houses the main switch, pump switch,

like profiles employ the principles of gravity and

hour meter and pro cess controller, which pro-

coalescence to separate the oil and particles

vides automatic operation and supervision. The

from the water.

process controller makes the unit easy to operate, providing fully automated monitoring and

Micro-fibre bed

control of all system functions.

A micro-fibre bed in the Mechanical Emulsion Breaker use the principles of filtration, collision,

Oil-in-water monitor

interception, inertial impaction and coales-

This OMD 2005 type monitor continuously

cence to remove any emulsions which remain

analyses the cleaned bilge water using samples

after the first processing stage.

that are extracted through the water line situated at the outlet. When the residual oil content

Oil domes

is 15 ppm or less, the cleaned water passes

The MPEB has two oil domes, one in the Multi-

through the three-way valve for immediate dis-

Phase Separator and one in the Mechanical

charge overboard or is routed to holding tank

Emulsion Breaker. Each dome collects the oil

for discharge later. When the residual oil con-

that is separated from the bilge water during

tent exceeds the 15 ppm limit, the three-way

each stage of separation.

valve re-circulates the water to the bilge water

Oil-in-water monitor

tank for re-processing. Control cocks Control cocks are situated on the oil domes to

Harbour control valve

check the function of the level electrodes.

When the ship is in port, bilge water separators can undergo inspection by authorities. To facil-

Oil drains

itate inspection, a manually operated three-way

Oil drains are situated in both processing

valve is installed immediately after and adjacent

stages. The level electrodes in each oil dome

to the three-way valve on the outlet. This

automatically control the drainage intervals.

enables authorities to test the bilge alarm and

When the oil level reaches its maximum capa -

the automatic stopping device without dis-

city, the level electrodes signal the control unit,

charging any bilge water overboard.

Helical rotary pump This progressive cavity pump transfers oily water from the bilge tank into the MPEB. The special design of the rotor and stator minimises agitation, thus reducing the formation of emulsions. The pump may be built on to the MPEB or delivered as a separate unit.

15

Flow diagram 1

2

Helical rotary pump

5

Oil domes

Transfers bilge water to the bilge sepa -

Collect oil that is separated from the bilge

rator.

water.

Strainer (Not included)

6

Oil drains

Traps large particles from the bilge water

Automatically discharge oil that collects

be fore the fluid enters the bilge sepa -

in the dome to the waste oil tank.

rator. 7 3

4

Level electrodes

Electric heater

Measures the level of oil in the dome at

Heats the oil to prevent clogging by hea -

two different levels and opens the oil

vy fuel oil when the unit is not in opera-

drain valve for inter mittent discharge of

tion.

oil and air that have accumulated.

Multi-Phase Separator (1 st stage)

8

Safety valve

Separates oil from bilge water using

Automatically releases pressure in the

patented profiles and the force of gravity.

unit, when pressure exceeds 3.8 bar.

Flushing water

To waste oil tank 8

7

6

LS

3

5

1

From drains and leaks 4

From bilge wells 2

Bilge holding tank

13

Sludge drain

13

9

Solenoid valve for scavenger line

13

Sludge drains

Enables the passage of water into the

Discharge collected sludge and particles

pump in order to prevent dry-running of

to sludge tank.

the pump. 14 10

Control cabinet

Mechanical Emulsion Breaker

Automatically controls bilge water sepa-

(2 nd stage)

rator functions and starts the pumps.

Separates fine emulsions using patented microfibre bed to agglomerate fine oil

15

Oil-in-water monitor Continuously measures oil content of

droplets into a wetting film.

cleaned bilge water. 11

Differential pressure switch Automatically switches the unit off if the

12

16

Three-way valve

pressure drop exceeds 1.5 bar, and indi-

Discharges clean water overboard and

cates on the control cabinet when ele-

re-circulates oily water that exceeds the

ments require replacement.

15 ppm limit to the bilge water tank. 17

Spring-loaded non-return valve

Harbour control valve

Directs the cleaned water overboard.

Enables manual testing of the bilge water

Spring loaded at 0.7 bar in the outlet.

separator while the ship is in port.

14

15

Sampling water 6

7

LS 11

PDS 9

5

9 12 16

10

3

17 13

Cleaned water overboard

Benefits for shipyards

Benefits for shipowners

Pre-mounted system for easy installation.

Reliable, easy-to-operate system provides

Complete delivery, including harbour control

continuous operation with automated control

valve, dry-run protection and overboard non-

and monitoring system.

return valve.

High separation efficiency, thanks to the pa -

Easy commissioning and initial start-up.

ten ted profiles and emulsion breaker ele-

Flexible configuration for different engine

ments.

room designs.

Reduced operating costs, thanks to automated control, low maintenance and minimal fresh water consumption.

TREATMENT OF OILY

MPEB 5

Retrofitting

Documentation

MPEB is ideal for replacing older bilge water se-

MAHLE Industriefiltration supplies each MPEB

parator systems. It is available as the MPEB-VT,

bilge water separator with full documentation

which is a separator unit that consists of two

either as paper copies or as PDF (Portable Do -

vessels. The first vessel is placed in the same

cu ment Format) files on a CD-ROM. The inst r -

location as the old bilge water separator; the

uct ion manual, which can also be made avail-

second vessel may be placed anywhere in the

able in most major languages, covers:

engine room where there is any available space.

Safety System description

MPEB-VT 5

18

Approval

Operating instruction

The MPEB and the oil-in-water monitor are

Alarms and fault finding

approved according to the IMO Resolution

Installation instructions

MEPC.107(49) as well as the European Marine

Spare parts

Equipment Directive, MED 2002/75/EC.

Component descriptions

The MPEB also fulfils the requirements of all

Spare parts, service and support

major classification societies. Upon request,

MAHLE Industriefiltation provides spare parts

the MPEB can be delivered with individual test

kits for all service and maintenance needs. Glo-

certificates (USCG-certificate No.162.050/9041/0

bal technical service, training and support are

or RMRS-certificate No. 06.001.08.272).

available throughout the lifetime of the MPEB.

WASTE WATER ON BOARD SHIPS

www.mahle-industrialfiltration.com MAHLE Industriefiltration GmbH Plant Hamburg Tarpenring 31–33 D-22419 Hamburg Phone +49 (0) 40-53 00 40-0 Fax +49 (0) 40-52 76-567 [email protected] www.mahle-industrialfiltration.com MAHLE Filtersysteme GmbH Industriefiltration Schleifbachweg 45 D-74613 Öhringen Phone +49 (0) 79 41-67-0 [email protected] www.mahle-industrialfiltration.com

70370376.07/2008

Fax +49 (0) 79 41-67-234 29