Page 5 - Al-Rashed Newsletter January 2020

SHIPPING WORLD
AL-RASHED PROJECTS- MUTLA SUB

STATION

Al-Rashed International Shipping Co Projects & Logistics Division in contract with M/s
Sayed Hamid Behbehani & Sons Co. W.L.L. (SHBC) Heavy Lift divisions handled new
sub-station projects for PAHW Mutla Project secured by Al-Ahleia Switchgear Co. who
executes turnkey-EPC projects for construction of 400kV/132kV/11kV Primary
Substations for PAHW, MEW Kuwait.
These Substations incorporate equipment such as 300MVA/30MVA Power
Transformers, 1000KVA/250KVA Station Transformers, Neutral Grounding Resistors,
400kV/132KV Gas Insulated Switchgears, 11kV Double Busbar Switchgear, associated
Control & Relay Panels and Battery & Battery chargers and shunt reactors.
Al-Rashed’s scope of work included receiving and delivery of Shunt Reactors and all
general accessories from Shuaiba port and delivery to the Mutla Sub Station sites (1Z,
2Z and 3Z) as well as the Jacking & Skidding Operations of 300MVA transformers
which includes placing & aligning the transformers on foundation as per client’s
requirement and specifications. The shipments arrived on 3 different vessels from
November 2019 to January 2020, where Al-Rashed was also the appointed vessel
agent for all 3 voyages.

JACKING STEPS
The first step in the jacking and cribbing procedure is to set up a safe jacking
arrangement. This arrangement consists of two cribbing piles and two identical,
hydraulically interconnected (hydraulically interconnected jacks are jacks that share a
common hydraulic supply line from a single hydraulic manifold and pumping unit in a
configuration so that the lifting pressure in both jacks is always equal) jacks placed at
one end of the piece of transformer at the manufacturer-approved equipment support
points.
The cribbing piles at the jacking end provide safety in the event that the hydraulic jacks
fail to support the load. These piles will also support the load when the jacks are not
used or removed. The other end of the equipment rests hard on cribbing to provide
stability. This is very important because it prevents the load from rolling during jacking.
This arrangement provides predictable loads in the jacks and at the cribbing points and
prevents two-pointing. During the jacking operation, the cribbing piles adjacent to the
jacks should be continuously shimmed to minimize the distance that the load will settle
in the event that a jack fails.
The next step is to extend the two interconnected jacks high enough to install the
cribbing layer. The jacks will extend equally because the opposite end is resting hard
against its cribbing. Install the layer of cribbing under the jacked end. Shim the cribbing
tight with steel shims or hardwood. Next, slowly release the pressure in both jacks using
a common needle type valve.

SKIDDING STEPS
Moving a transformer by skidding requires services and equipment which can be
supplied only by an experienced heavy-equipment moving contractor.
If lifting by crane is impractical, the transformer can be moved along the ground by
Skidding on greased rail beam Moving transformer along the railway involves four
distinct steps:
a) Building the railway; Setting Supporting Beams, Wooden Block, and Rail, setting
between Foundation and Multi Axle
b) Moving the Transformer from the multi axle to the railway;
c) Skidding along the railway;
d) Positioning the transformer on designated place.