Civil Engineering Reference
In-Depth Information
Inserts formed from flat steel bar are bent using reduced formers to produce
bends of controlled radius. The supplier
'
s proposed procedure is selected to
ensure that the tolerances and acceptance criteria are fully complied with.
6.8 INSTALLATION OF ANODES
In the case of a new structure, the anodes are usually installed on the fixed offshore
structure by welding in and by clamps. In the case of retrofitting, the anode sup-
ports the existing steel structure. When using the clamp type, electrical continuity
is typically provided by a copper cable, attached to the anode support and the pro-
tection object by brazing, or by some special mechanical connection designed to
ensure reliable electrical continuity. Electrical continuity cables may also be
installed to provide electrical continuity to components of a CP unit without reli-
able electrical connection to anodes by welds, by metallic seals or by threaded cou-
plings. The design requirements for such connections apply.
In the detailed design drawings of the CP system, it is important to consider
the anode-fastening devices, which should be designed to be match the method
of installation and operation of the offshore structure platform and any other
special requirements.
Thermite welding is not recommended, but pin brazing may be considered.
The following information and any optional requirements (intended as a
checklist) should be supplied by the purchaser:
anode detailed drawings from CP design, or by manufacturer if completed
●
the detailed drawing for CP design defining the location of individual anodes
●
preparation requirements
●
any special requirements for documentation
●
any further amendments to, and deviations from, the order.
●
The contractor may specify that all work related to anode installation be
described in an installation procedure specification. If applicable, this document
should include, as a minimum, the following:
materials specification and equipment to be used, including certificates and
material data sheets
●
receipt, handling and storage of anodes and other materials for anode installa-
tion requirement
●
reference to welding and/or brazing procedure specifications and qualifica-
tion of personnel carrying out welding/brazing
●
anode fastening inspection and testing procedure.
●
All welding associated with anode installation should be qualified according to
a recognized standard. Only qualified welders of brazing equipment may be used.
Installation of anodes is carried out according to the approved for construc-
tion drawings that will present locations of individual anodes and any other
relevant specifications for fabrication of the protection object. To facilitate
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