15 August 2002
Tremie Concrete - Concrete placed underwater in such a manner that there is no
free drop of the concrete through the water. This can be accomplished by
pouring through a pipe or placing with special bottom-dump bucket. See Tremie
Tremie Pipe - A vertical pipe through which concrete is placed underwater. In
operation, water must be expelled from the pipe (so as not to mix with the concrete) by
a go-devil (see above) placed ahead of the concrete, or the pipe must be freed of water
before placing concrete and kept dry by means of a special flap valve at the bottom.
During concrete placing, the bottom end of the pipe is kept buried in the concrete mass
being placed so as to prevent backflow of water into the pipe.
Weep Hole - Opening provided in a wall or bulkhead to facilitate drainage of water. It
usually serves to reduce hydrostatic pressure behind the structure.
Wheeler System - A system for introducing hot water into ship oil tanks and means for
removing resulting froth and sludge.
Wildcat - A pocketed and slotted wheel on a winch over which a chain passes.
Winch (or Windlass) - An engine fitted with a rotating drum for hauling ropes. Some are
fitted with multiple drums, a gypsy head for hauling ropes, or a wildcat for hauling