Month: July 2026

Easy installation with minimized footprint

The major components of PureBallast 3 Ultra are installed

inline, with the filter and UV reactor(s) incorporated into the

ballast water piping. System layout is simplified by the smaller

design of the upgraded filter, as well by the integration of the

Cleaning-In-Place (CIP) unit and pressure monitoring device

into the UV reactor module. These factors minimize system

footprint, reduce piping work and maximize installation

flexibility for the shipyard.

Delivered Connectivity-ready

To simplify connectivity, the PureBallast 3 Ultra scope of

supply includes a built-in field gateway. The system is

delivered ready to take advantage of Alfa Laval PureBallast

Connect, a secure digital service portal that provides remote

access to system information – anytime, anywhere. Available

on a subscription basis, PureBallast Connect offers ways to

maximize uptime, reduce workload and optimize fleet-wide.

Designed and supported for the whole vessel lifetime

PureBallast 3 Ultra is designed for enduring performance. The

filter and UV reactor(s) are made with best-in-class materials

and built to last the whole vessel lifetime. Features such as

electric actuators on the main valves, which minimize the risk

of pressure waves, secure system reliability.

Our robust design principles enables us to provide a

sustainable supply chain for the entire vessel lifetime.

Adding to the peace of mind are Alfa Laval’s skills, resources

and global service network. We provide shipyards with close

local support, and we deliver parts and optimization

throughout the system lifetime – wherever the vessel sails. Alfa

Laval is a partner to rely on, always.

Introduction

Alfa Laval PureBallast 3 Ultra is the latest ballast water

management system built on proven PureBallast 3

technology. Offering increased performance in challenging

waters and even easier installation, it can be configured for

ballast water flows of 42–3000 m3/h, as well as Ex

requirements.

PureBallast 3 Ultra treats ballast water without chemicals,

combining high-performance filtration with enhanced UV

treatment. In the UV reactor(s), specially designed synthetic

quartz lamp sleeves transmit an extended wavelength

spectrum that provides more UV light. Together with the

internal reactor design, this ensures optimal UV dosage with

very low energy consumption. An expanded range of reactor

sizes further reduces power needs in specific configurations.

Aalborg OM-TCi sets the new standard for fuel economy

in marine boilers. The high efficiency means less fuel consumption,

thereby lower operating cost for the ship owner

and reduced emissions to our environment. Aalborg OM-TCi

is a vertical oilfired boiler with a large furnace and an

enhanced convection part. The standard boiler can be fired

with various fuel oils.

Aalborg OM-TCi is a vertical cylindrical steam boiler in the

capacity range of 8.000 – 20.000 kg/h. It has been developed

based on our well-proven technology and long experience.

The best features of the well-known Aalborg CHB (formerly

UNEX™ CHB) and Aalborg OM (formerly MISSION™ OM)

boilers have been incorporated into the new boiler design.

Furnace

Aalborg OM-TCi consists of a large furnace with gas-tight

membrane walls. A sufficient number of downcomers ensures

safe natural circulation, and adequate furnace dimensioning

guarantees good combustion, moderate loading and low

material stresses.

Convection part

The cylindrical shell surrounds the smoke tubes. These

smoke tubes have enhanced heat transfer features

guaranteeing low exhaust gas temperature and thus high

efficiency.

Burner

The standard boiler can be delivered with an Alfa Laval burner

with fully automatic operation and control. The burner is designed

for a high turndown ratio with complete combustion at low

oxygen levels. Alfa Laval’s Aalborg KB rotary cup burner or

Aalborg KBSA steam atomizing burners are offered based on

application or customer preference.

Control system

The burner and boiler can be monitored and regulated by Alfa

Laval’s own panels such as Aalborg Control, Aalborg Control

Touch or the self-diagnostic Aalborg Steam Pilot safety andcontrol

systems.

Control system

The reliable and userfriendly microprocessor based Aalborg

control system facilitates the operation and control of the

Aalborg OC boiler. The control system provides fully automatic

operation of the boiler plant and the pressure jet

burner. The Aalborg control system includes burner load and

sequence controls, water level and safety device, burner

motor and fuel heater starter, and starter for fuel oil pumps.

Silencer

The composite boiler can be supplied with a compact silencer

to suit any type of diesel engine. The silencer is based on

well-proven technology. The optimum silencer dimensions are

unique for each installation and calculated on the following

basis:

• Engine type

• Exhaust gas amount and temperature at 100% engine load

• Required level of silencing

• Exhaust gas system dimensions

Customer benefits for shipyards and owners

Aalborg OC is designed to meet the ever increasing demands

for rational and cost effective shipbuilding – in every phase of

the project.

Virtually no on-site assembling

Aalborg OC can be delivered fully assembled.

Easy installation

Installation is a matter of connecting up with premounted

fittings and connections situated almost exclusively on the

boiler top. Inlet and outlet boxes are included and the boiler

foundation is prepared for welding to the deck. When opting

for the composite boiler solution, only one boiler has to be

installed and a circulation pump is superfluous.

Project and engineering hours cut to a minimum

All information regarding boiler plants is available immediately

upon request. Due to parametric design methods, the optimal

solution can be identified and quoted instantly. This includes

layout drawings for design of the engine room. Aalborg OC is

an advanced composite boiler in standardised design, offering

thoroughly tested and optimised solutions. Due to the

composite boiler functioning as both oil- and exhaust gasfired

boiler, a high degree of redundancy is obviously built into

the system.

Easy inspection and maintenance

Aalborg OC has adequate space for inspection and maintenance

in the steam/water space.

Construction

Aalborg OC is a vertical boiler with an exhaust gas section consisting

of bare smoke tubes. The cylindrical shell surrounds

the smoke tubes, the furnace, the steam space and the convective

section, which consists of pin tube elements. The boiler

pressure part is manufactured from mild steel able to withstand

high temperatures. Stress concentrations in corners are minimised

by the simple design of cylindrical shells with flat plates

of equal thickness.

Burner

Aalborg OC is equipped with a Aalborg type pressure-jet burner

or Aalborg types rotary cup burner. The burner is mounted

and can be swung out for service and easy access to inspect

the furnace. The burner housing is mounted on the boiler front,

angled 15 degrees downwards against the furnace bottom. This

allows for a long flame and offers better utilisation of the furnace

and the result is a high performance combustion – even with.

The flow of the combusting particles becomes optimal, and

the result is a high performance combustion – even with the

lowest grades of fuel. As an alternative, Aalborg OC can be

equipped with a rotary cup burner.

Aalborg OC is a high performance, combined oil and exhaust

gas-fired boiler, with a 750-5.000 kg/h capacity of the oil-fired

section at 9 bar(g) design pressure. Aalborg OC is a vertical,

cylindrical boiler with an exhaust gas section consisting of bare

smoke tubes while the oil-fired section features pin tubes in

the convection section.

The boiler design has integrated pin tube elements. The pin

tube elements support both the furnace and the boiler top

plate. The design has been significantly optimised to achieve

lower weight and improved strength. The result: longer lifetime

of the pin tube by a factor of 8.

Description

Aalborg OC is a high quality composite boiler design offering

the space-saving alternative of two boilers combined into one.

Aalborg OC is a combined oil and exhaust gas-fired boiler

with a capacity range of up to 5.000 kg/h steam from the

oil-fired section and up to 3.000 kg/h from the exhaust gas

section. It is a standardised, preassembled boiler plant that is

fast and easy to install even if we design the boiler from case

to case to get optimum design. Aalborg OC is designed

according toAlfa Laval’s modular Aalborg boiler concept.

Aalborg OC engages less deck area and has lower weight than

older designs of composite boilers.

Design

The Aalborg i-OC is a vertical and cylindrical boilerthat employs natural circulation of water

and steam. Its pressure sections are manufactured from mild steel that is able to withstand

high temperatures.

The plant is designed according to Alfa Laval’s modular Aalborg boiler concept, with a main

module that comprises two parts: an oil-fired section and an exhaust gas section that recovers

heat from the main engine.

One or two optional exhaust gas modules (Alfa Laval Aalborg Micro boilers) can be incorporated

for auxiliary engine waste heat recovery. Handling the auxiliary exhaust gas with separate but

connected modules ensures flexibility and a stress-free plant design.

• Oil-fired section

The oil-fired section of the main module comprises a furnace, a steam space and a convection

section. The convection section, through which the flue gas flows, consists of helix tubes with

a turbocleaning effect.

• The modulating-type pressure-atomizing burner (Aalborg MF PA) is fully integrated with the

convection part of the oil-fired section. The burner housing is mounted on the boiler front,

angled 15° downwards towards the furnace bottom. It optimizes the flue gas flow distribution

during combustion, which results in higher performance in the convection part and lower NOx

emissions.

• Main engine exhaust gas section

The main engine exhaust gas section comprises smoke tubes and an internal bypass damper.

The bypass consists of a plain tube welded to the lower and upper tube plates,

with the automatic damper installed in the top.

• Auxiliary engine exhaust gas boilers (optional)

The exhaust gas boiler modules for auxiliary engine waste heat recovery comprise serrated

and finned spiral tubes. Each module has its own exhaust gas bypass damper.

These smaller modules are bolted directly to the main module, with no piping or other

equipment. All boiler mountings are shared with and installed on the main module.

Benefits

• Composite design – can utilize fuel and/or exhaust gas

• Minimized footprint and weight

• Internal bypass for regulation of steam production and back pressure

• Standardized, pre-assembled and easy to install

• Optimized for high self-cleaning effect in the smoke tubes

• New burner design for easy inspection and maintenance

Maintenance

The Aalborg i-OC has adequate space for inspection and maintenance in the steam and water

sections. The boiler can easily be washed with water or mechanically cleaned through the

boiler uptakes, and the smoke tubes are also easy to clean when needed. The Aalborg

i-OC is optimized for water level control and a high gas velocity even through the smoke

tubes, which makes it effectively self-cleaning.

Servicing the burner is easy. By opening a top plate, the lance can be withdrawn to service

both the lance and nozzle. Access to the oil system and electrical components is possible

through two separate covers on the side of the burner.

Selection

All information is available immediately upon request, including layout drawings for the

design of the engine room.

The Alfa Laval Aalborg i-OC is a high-performance composite boiler, capable of generating

steam through the firing of oil and/or the recovery of waste heat from engine exhaust gas.

Its modular design comprises one oil-fired section and one–three exhaust gas sections.

One of the exhaust gas sections is connected to the main engine, while the two other

exhaust gas sections are optional and can be connected to one or two auxiliary engines.

Application

Able to work with multiple heat sources, the Aalborg i-OC offers reliable production of steam

while sailing and during port stays. As a composite boiler, it demands considerably less space

than having both oil-fired and exhaust gas boilers on board. In addition, it has a smaller

footprint and weighs less than older composite boiler designs. At its operating pressure of 

7 bar(g), the Aalborg i-OC can produce up to 2500 kg/h of steam with its oilfired section

and up to 1000 kg/h with its exhaust gas sections.