Automatic tank cleaning.Effi cient systems. Safe management.

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Our background: No. 1 worldwide in environ-mental services.

Veolia Environmental Services, we are part of Veolia Envi-

ronment, the world’s leading company for environmental

services in the fi eld of water, disposal services, energy op-

timisation and transport. We have almost 300,000 Veolia

employees operating in more than 67 countries with know-

how, a high degree of technical expertise and with passion

for the preservation of existing resources and their environ-

mentally compatible utilisation. Veolia Environmental Ser-

vices off er a complete service for all disposal and environ-

mental problems. Our customer orientation is proven daily

by our delivery of reliable services on schedule using the

latest technology. Furthermore, our high effi ciency and fl exi-

bility guarantee a competitive price- performance ratio.

A state-of-the-art installation and setup.

For all types of industrial cleaning we often have processes

developed in-house and the latest machinery and vehicles,

in order to meet the highest safety and technical require-

ments. At the same time, we never lose sight of economic

effi ciency as the core of our customer orientation, speed

and an outstanding price performance ratio characterise

our service. Our personnel are passionate team players, com-

petent, quality aware and thorough in their compliance

with all directives and guidelines in the fi eld of environ-

mental protection and occupational health and safety.

Versatility: always from a single source.

Our inter-group experience enables us to off er a compre-

hensive range of services. This includes very individual

requirements. We know the situation on the ground and

as a powerhouse of innovation we develop technological,

modern solutions to meet your present and future requi-

rements. See for yourself how we carry out modern tank

cleaning …

2 Tank cleaning 3Tank cleaning

Innovative processes modernise industry.

This includes tank cleaning technology.

The optimum performance capability of in-

dustrial systems lies in the globalised manage-

ment of the decisive competitive advantage.

Unnecessary shutdown times, process faults

or complications arising from environmental

legislation must be precluded. In the search for

outsourcing partners for services, trust in the

technological expertise, experience and qualifi cations of personnel and the readiness

of operating teams to cooperate comes fi rst. For cleaning storage and crude oil tanks,

Veolia Environmental Services off ers the ideal systems.

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4 Tank cleaning

Make way for the cleaning cannon.

The Manway Cannon forms a unit consisting of a cleaning

nozzle, video camera and searchlight, mounted in a cleaning

opening of the tank. Controlled from a mobile control room

with a self-suffi cient energy supply, the fl exible cleaning

cannon can fl ush out any point in the tank with water or

some other medium.

A hydraulic pump generates the required pressure.

Automated or joystick-controlled: the operator has it in full view.

In the mobile control room, the cleaning process is mo-

nitored on several monitors and is digitally recorded and

documented. The camera and cleaning cannon perform

their tasks either automatically using special software

or under the manual control of the operator. If there are

ignitable residual products, the inside of the tank is iner-

ted and the atmosphere is monitored by an online analy-

sis station. If the maximum limit value is exceeded, the

cleaning system automatically shuts down. Residual gas

can be fed back to the tank through a cushion gas line

when vacuuming out the cleaning residue.

The technology:

• The system meets the requirements of the Machinery

Directive and of RL 94 / 9/ EC: Explosion Protection Directive

(ATEX 95) Zone 1 with respect to explosion protection:

• Flushing pressure up to 20 bar at 950 l / min.

• Online analysis station with infrared measuring techno-

logy for continuous monitoring of the gas atmosphere in

the tank

An overview of the advantages:

• Cleaning in a sealed system

• No direct exposure use of a cleaning team in the tank

• Time saving combined with a high standard of safety.

• Avoidance of emissions.

• Automation and documentation

Manway CannonRemotely controlled automated tank interior cleaning.

The manual removal of dirt and residue from inside tanks using cleaning teams wearing

protective clothing and breathing apparatus belongs in the past. This was physically

and mentally stressful for the workers, time-intensive and by no means free of safety

risks. The Manway Cannon method developed by us is the safest, most environmen-

tally friendly solution for the internal cleaning of storage or crude oil tanks of any size.

Tank cleaning 5

Sedimentation tank 1

Vacuum tanker

Vacuum pump

Mobile control room

Water from fi re service hydrants

Sedimentation tank2

Nitrogen (N2)

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7Tank cleaning6 Tank cleaning

How it’s done: Sludge dissolution using heated crude oil.

COWS automatic cleaning is achieved with the roof landed

in the maintenance position. Before the tank is emptied,

the sludge is mapped.

The pneumatically driven injectors are positioned inside

the tank through the roof leg supports.

The tank is sealed, emptied and inerted before the washing

operation.

A supply tank is needed to provide fresh crude oil, it is pre-

heated and pumped out to the injectors in the washing

tank. During this phase solids are controlled by encoura-

ging sedimentation using the tank as a decanter. The crude

oil and the valuable recovered hydrocarbons (dissolved sludge)

are vacuumed out by the COWS unit and transferred back

to the supply tank.

A fi nal circulation with gas oil is undertaken to complete

the dissolution of the sludge, to maximise hydrodynamic

cleaning of the roof, wall and fl oor.

The supply tank is kept under refi nery specifi cations thanks

to dedicated fi lters. Continuous fi ltration eliminates inor-

ganic compounds such as sand, rusts, paintings etc.

The supply tank can be operated during cleaning operations.

When the automatic cleaning is fi nished (controlled with

regular mapping) operators enter the tank to remove the

few remaining inorganic solids and complete the internal

clean.

An overview of the advantages:

• No personnel in the sealed, inerted tank

• Optimisation / reduction of the gas atmosphere for fi ne

cleaning

• Minimisation of the gas emissions by means of the

sealed system

• Reduction of waste and recovery of crude

• Time and cost saving

Our COWS (crude oil washing system) method is also carried out

in a sealed system to ATEX standard (ATEX 95), Zone 1 and renders the

use of personnel inside the tank during cleaning superfl uous.

The basic principle is dynamic sludge dissolution using heated crude oil, with

the heated crude oil being introduced into the inerted tank through special nozzles

in the sealed roof.

COWS Crude oil washing system

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managing resources:

www.veolia.co.uk

Refi nery ProjectsVeolia Environmental Services (UK) PlcDock Road South, Bromborough, Wirral Cheshire CH62 4SQtel: +44(0)151 644 4300fax: +44(0)151 644 4301

e-mail: info@veolia.co.uk

Veolia Umweltservice Industrie-Reinigung GmbH & Co. KGKruppstraße 941540 DormagenTel. +49(0)2133 264-0Fax +49(0)2133 264-120

E-Mail: ir@veolia-umweltservice.de

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