Section 1: INTRODUCTION
Scope. This handbook provides comprehensive descriptions of the
predominant crane types in service at Navy shore facilities. It also outlines the
design requirements and the pertinent engineering methodology for design
evaluation of older and contemporary cranes.
It should be understood that numerous exceptions to the crane
configurations, design features, and design criteria can be found in the Navy
crane inventory all with a record of successful performance but they are
beyond the scope of this handbook. Unless such exceptions are clear
non-compliances with the requirements of this handbook or their performance
becomes questionable, they should be left intact.
Definitions. The terms "older cranes", "newer cranes", "standard
commercial", and "custom design(ed)", and "built-up" are used throughout this
handbook. Their definitions follow.
Older cranes, in the case of portal and floating cranes, are those
designed and built prior to the early 1980's; newer cranes are those of the later
period. Their prominent visual distinctions are illustrated in figures 5, 6, 7,
and 8. Container and mobile cranes are all in the newer crane category. The
distinction among the other crane types is less identifiable, but the most visible
features on older cranes are riveted structural connections, extensive use of open
gearing, wide use of castings, and imprecise material identification.
Standard commercial or commercial assemblies and components are
those items readily available off-the-shelf from manufacturers specializing in the
design and production of such items. This definition encompasses mobile cranes,
packaged hoists, underrunning hoist/trolley units, gear reducers, brakes,
spreaders, hooks, wheels, etc. To be used on cranes, these items must comply with
the applicable recognized industry standards.
Custom designed or built-up are terms applied to items of original
or unique design, including entire cranes, assemblies, and components.
Applicability to Older Cranes. Older cranes, which do not comply with
the design criteria presented in this handbook, may remain in service in their
original configuration if they have a history of satisfactory performance. When
assemblies or components of older cranes need to be repaired or replaced, they
should be upgraded to the criteria of this handbook only where it is practical to
do so. Navy Crane Center (NCC) controls this upgrading process through the review
and approval/disapproval of Crane Alteration Requests, as mandated in NAVFAC
Applicability to Standard Commercial Items. The applicability of
Sections 4, 5, 6, and 8 to purchased off-the-shelf items is limited to the
optional features offered by the manufacturers of these items and easily
implemented modifications. Such modifications are confined essentially to
replacement of wire rope, hook block, or hook of packaged hoist or hoist/trolley
Cancellation. This handbook cancels and supersedes NAVFAC DM-38.01,
Weight Handling Equipment, and Change 1 dated October 1986.