Four J D Neuhaus type EH50
air operated monorail hoists
have been supplied and
mounted by Westcon
Løfteteknikk AS of Bergen to
the Maersk offshore rig
Guardian.

They been specified for
synchronised lifting and
handling of an 18.3/4in
15,000psi BOP unit before
and after drilling operations.

Two hoists are each mounted
on twin parallel overhead
rails; each hoist provides 50t
load and 20m lift capacities
for between deck operations.

Removable connector bars
have been supplied for fitting
between paired hoists on the
individual rails to maintain a
fixed working distance of
4060mm between the load
hook centres. With the two
sets of hoists operating
together, a combined lift
capacity of 200t is made
available. The minimum
horizontal travel distance of
the trolleys with connector
bars fitted is 14.81m. The
maximum free travel without
connector bars in place is
18m, with travel distance
limited by pneumatic end
switches on the hoist trolleys.