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API SPEC 2C Document Information:
Title
Specification for Offshore Pedestal Mounted Cranes
American Petroleum Institute
Publication Date:
Mar 1, 2004
Scope:
GENERAL
This specification details the requirements for design, construction,
and testing of offshore
pedestal mounted cranes. Offshore cranes are defined herein as
pedestal mounted elevating and
rotating lift devices of the types illustrated in Figure 1 for
transfer of materials or personnel
to or from marine vessels and structures. Offshore cranes are
typically mounted on a fixed (bottom
supported) or floating platform structure used in drilling and
production operations. API Spec 2C
is not intended to be used for the design, fabrication, and testing of
davits and/or emergency
escape devices. API Spec 2C is also not intended to be used for
shipboard cranes or heavy lift
cranes. Shipboard cranes are mounted on surface type vessels and are
used to move cargo,
containers, and other materials while the crane is within a harbor or
sheltered area. Heavy lift
cranes are mounted on barges or other vessels and are used in
construction and salvage operations
within a harbor or sheltered area or in very mild offshore
environmental conditions.
SAFE WORKING LIMITS
The intent of this specification is to establish safe working limits
for the crane in anticipated
operations and conditions. This is accomplished by establishing Safe
Working Loads (SWLs) based on
allowable unit stresses and design factors. Operation of the crane
outside of the limits
established by the manufacturer in accordance with the guidelines set
forth in this document can
result in catastrophic failure up to and including separating the
entire crane and operator from
the foundation. Compliance with the allowable stresses and design
factors set forth in this
specification does not guarantee that the crane will not be dismounted
from its foundation in the
event of a gross overload such as might occur in the event of snagging
the supply boat.
CRITICAL COMPONENTS
A critical component is any component of the crane assembly devoid of
redundancy and/or auxiliary
restraining devices whose failure would result in an uncontrolled
descent of the load or
uncontrolled rotation of the upper-structure. Due to their
criticality, these components are
required to have stringent design, material, traceability, and
inspection requirements. The
manufacturer shall prepare a list of all critical components for each
crane. Appendix A contains an
example list of critical components.
COMMENTARY
Further information and references on various topics contained in this
specification are included
in the Commentary found in Appendix B. The section numbers in Appendix
B correspond to the section
numbers of this specification. For example, Section 4.3 of this
specification, entitled In-service
Loads, corresponds to Section B.4.3 in Appendix B.
RECORD RETENTION
The manufacturer shall maintain all inspection and testing records for
20 years. These records
shall be employed in a quality audit program of assessing malfunctions
and failures for the purpose
of correcting or eliminating design, manufacturing, or inspection
functions, which may have
contributed to the malfunction or failure.
MANUFACTURER SUPPLIED DOCUMENTATION
The manufacturer shall supply to the purchaser certain documentation
for each crane manufactured.
Unless otherwise agreed to by the purchaser, the documentation shall
include:
1. Load and information charts per Section 4.2.
2. Crane foundation design forces and moments per Section 5.2.
3. List of all critical components per Section 1.3 and certification
that these components meet the
API Spec 2C material, traceability, welding (as applicable), and
nondestructive examination
requirements.
4. Operations, Parts, and Maintenance Manual.
5. If requested by the purchaser, failure mode assessments for gross
un-intended overloads as per
Section 4.6.
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