Page 33 - Impiantistica Industriale

Pict .06

Pict .05
operation. They were issued several documents tracks . Fagioli high performance skidding system
and studies after an in-depth analysis of the ground is designed to self-load and move items horizon-
capacity around the installation area: levelling acti- tally from one location to another. Steel structure
vity was executed with sand and crusher-run ma- of the skid system is composed by a Main Body
terial as well as the production of drawings with a and two “double boogie” Floating Shoes (to over-
“map” for the accurate placement of mats onto the come possible gaps and misalignment) in such a
ground. This was done just for the correct and safe way the shoes can negotiated track crown +/‐ 2°.
positioning of the heavy lift crawler crane. The floating shoes are provided with stainless ste-
el at the bottom and they can slide onto the skid
Once the vessel was on vertical position, Fagioli tracks, which are provided with teflon pads. Fagioli
disconnected the reactor from the tailing frame sy- developed a skid system with skid shoes capaci-
stem and lowered it onto temporary supports. This ty of 1000 ton each with the possibility to couple
operation allowed the installation of No. 4 ‘sup- 2 skid shoes for a total of 2000 ton capacity. The
port shelves’ at the bottom of the reactor. These skid shoe is composed by two sections, hinged Pict .07
support shelves had the main function to be used together and equipped
as “connectors” for the skidding system which was with n.° 2 push – pull
subsequently used for the skidding operation. units (composed of two
After the installation of the support shelves (with a jacks hydraulically linked
weight of about 1.8 ton each) and the retaining pla- and one anchor block),
tes inside the “skirt” of the vessel, the reactor was with the upper frame free
lifted, rotated and moved by crawler crane over the to slide transversally with
existing pipe rack (pict.05). respect to the skid base
+/- 50mm. A sophistica-
The pipe rack, containing methane and cables, ted control system provi-
was impossible to be removed and prevented the des high standard of syn-
passage of the reactor by trailers or SPMTs. chronization among the
skid shoes both for lifting
and skidding operations.
Skidding operation The positioning of the re-
actor onto the skid shoes
and final installation was gradually executed
with load releasing sta-
In the meantime Fagioli operators had been prepa- ges in steps of 20% at a
ring a tailor made squared support frame provided time until each skid sho-
with clamps (pict. 06). The frame was planned, cre- es took about 130 ton of
ated and manufactured by Fagioli with the scope of load (pict. 07).
receiving the reactor in vertical position. The squa- After checking that the
red support frame was fixed onto No. 4 x 1,000 support frame was cor-
ton capacity each skid shoes positioned onto skid rectly positioned onto the

Impiantistica Italiana - Maggio-Giugno 2023 29