SOMETIMES THE SAFESTSOLUTION IS ALSO TWO MONTHS FASTER.

SELLAFIELDCUMBRIA, UK

SEP 29 2013

MAY 13 2011

LOADING A MODULE ONTO THE BARGE

TILTING THE LAST MODULE IN PLACE

Discover more on www.mammoet.com

NUCLEAR SAFETY REQUIREMENTS INSPIRE AN OPTIMIZED SCHEDULE.

SEP 24 2013

DISCHARGE OF MODULEJUNE 2 2011

BEACH LANDING OF SPECIALLY DESIGNED BARGE

A Z

As in all nuclear projects, safety

was the top priority for the

construction of a new evaporator

unit at the Sellafield nuclear

reprocessing site. To accelerate

the schedule, civil engineer

Costain had developed a modular

construction plan. Eleven

modules had to be transported

to the site before being lifted

and installed inside the unit.

The safety of the procedure had

to be absolutely beyond doubt.

So Mammoet killed two birds

with one stone by devising a

tailor-made four-way gantry

system that would deliver

precision and safety while saving

two months of construction time.

The gantry system would lift each of

the modules to the correct height,

from which they would be skidded

into the new unit and installed.

However, the modules needed to be

installed in 11 different locations in

the unit. This meant that the entire

gantry system had to be moved

alongside the unit prior to each

installation. Normally, a gantry is

jacked-up and down when it needs

to be repositioned. But this would be

time-consuming if it had to be done

11 times. Therefore, Mammoet came

up with the idea of designing and

installing the system on permanent

skids. That way, the gantry could be

skidded without jacking-up the entire

system every time it needed to be

repositioned. This solution greatly

increased the level of efficiency, and

saved two months of time during the

whole project.

The modules – ranging between

50 and 500 tons – were built at

Ellesmere Port near Liverpool.

After completion, they were

transported to the quay on Mammoet

SPMTs. There, they were positioned

on a specially-designed barge that

could land on the beach near the site

as there was no dock facility

available. Via an installed ramp and

temporary road over the beach,

the modules were driven off to the

storage area. There they were

checked, and then transported to

the site for installation. The gantry –

34 meters high, 38 meters wide, and

18 meters long – lifted the modules

from the SPMTs to the right level.

From there, they were skidded into

the evaporator unit for installation.

The last module was lifted and

installed in 2013, and the new unit is

expected to be operational in 2016.

RESOURCES

CRANES 2 mobile cranes

TRANSPORT 32 axle lines of SPMT

MARITIME EQUIPMENT 1 barge

SPECIAL EQUIPMENT 1 gantry system, consisting of:1 heavy skid system, 2 38 meter gantry beams, 1 medium skid system, 1 specially designed lift table, 1 stroke controlled jacking system, 4 300 ton strand jacks

CREW 16 Mammoet professionals

used

by

perm

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used

by

perm

issi

on fr

om S

ella

field

Ltd

used

by

perm

issi

on fr

om S

ella

field

Ltd