Offshore Crane Safety

 

Offshore Mechanical Cranes, Introduction

Item Code 11125

Introduction to mechanical crane operation and definition of terms specific to offshore use. (Also available in Portuguese)

SCRIPT SAMPLE
...On this crane there are two load carrying lines. The first being the main hoist line, used for heavy slow lifting. The main hoist line follows a path from the revolving superstructure up the boom through the head machinery down to the main hook block...

...Multiple part reeving is used to connect the main hook block to the head machinery. Multiple part reeving is a system where the wire rope travels around a series of sheaves in both the head machinery and main hook block...

...The second load carrying line is the auxiliary hoist line, used for light fast lifting. The auxiliary hoist line follows a path from the revolving superstructure up the boom through a single sheave in the boom tip extension down to the overhaul ball...

...Now let us go back to the revolving superstructure and inside the cab where the cranes operational controls, operator's station and machinery are located...

...We'll start with the prime mover of the crane called the engine. Connected to the engine is the power take-off or master clutch. The power take-off transfers engine power to the operating functions of the machine. Clutches are used to engage or disengage the power from the power take-off. These clutches in turn transfer the power to the machine functions such as booming, swinging, and hoisting...

...To control these crane functions, once the clutches are disengaged circular brakes are used. These brakes, called band brakes, have a metal band lined with heat and wear resistant friction material...

...The wire rope from the main and auxiliary hoists are spooled onto drums called laggings...

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John Sabella & Associates, Inc.
John Sabella & Associates, Inc. &bull 190 W. Uncas Road, Port Townsend, WA 98368 &bull USA
Phone: 360-379-1668 &bull Fax: 360-379-5148 &bull info@johnsabella.com