Nace CP 1, Course Manual

Page: 321 / 535

RP0176-2003
NACE International
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Foreword
Offshore structures represent large capital investments. Structures are being placed in offshore
areas worldwide and are being designed to withstand forces resulting from hurricanes, arctic
storms, tidal currents, earthquakes, and ice floes. Moreover, platform structures are currently
being placed in deeper waters and, therefore, have become larger, more complex, and more
expensive. Control of corrosion on structures is necessary for the economic development of oil
and gas production, to provide safe support for working and living areas, and to avoid potential
harm to the environment. For the purposes of this standard, offshore structures are considered to
be stationary structures (platforms or subsea facilities) that are fixed to the sea floor by gravity,
piling, and/or mooring cables.
This NACE International standard is intended for use by corrosion control personnel concerned
with the corrosion of steel fixed offshore platforms associated with petroleum production. It
outlines materials, practices, and methods for control of corrosion for steel fixed structures
associated with petroleum production located in offshore areas. The purpose is to facilitate more
effective corrosion protection of structures by the presentation of reliable information. Corrosion
on offshore structures can be divided into three major areas: the submerged zone, the splash
zone, and the atmospheric zone. The submerged zone also includes that portion of the structure
below the mudline. This standard does not include procedures for the control of internal corrosion
of wells, piping, and associated equipment that may be in use on the structure, but does include
external protection of these items in the atmospheric zone on the structure.
This standard was originally issued in 1976 and revised in 1983 by Task Group (TG) T-1-2 on
North Sea Corrosion Problems. It was revised in 1994 by Task Group T-1-5 and in 2003 by Task
Group 170, which is administered by Specific Technology Group (STG) 30 on Oil and Gas
Production—Cathodic Protection. TG 170 is sponsored by STGs 02 on Protective Coatings and
Linings—Atmospheric and STG 05 on Cathodic/Anodic Protection. It is issued by NACE
International under the auspices of STG 30.
In NACE standards, the terms shall, must, should, and may are used in accordance with the
definitions of these terms in the NACE Publications Style Manual, 4th ed., Paragraph 7.4.1.9.
Shall and must are used to state mandatory requirements. The term should is used to state
something good and is recommended but is not mandatory. The term may is used to state
something considered optional.
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