Civil Engineering Reference
In-Depth Information
FIGURE 6.9
Cow horn anode weighing 189 kg.
the installation, stand-off anodes to be mounted on structural members could be
displaced laterally not more than one anode length and circumferentially a max-
imum of 30
.
For welding of anodes to structural members under high external loads,
welded connections are placed at least 150 mm away from other welds, and
a minimum of 600 mm away from structural nodes of jacket structures.
Installed anodes must be adequately protected during any subsequent coat-
ing work. Any spill of coating on anodes has to be removed. For coated objects,
exposed anode cores are coated to the same standard.
Visual inspection of the welds and any brazed connections is the main
inspection procedure for anode installation.
For welding to structural members, further nondestructive testing (NDT),
such as radiographic or ultrasonic testing, may apply in accordance with the
applicable fabrication specification.
Subsequent to completed anode installation, compliance with drawings for
anode installation must be confirmed.
For brazed and mechanical connections for electrical continuity, measure-
ments are carried out according to a documented procedure and with an instru-
ment capable of verifying an electrical resistance of 0.1 ohm maximum.
Cow horn anodes are shown in
Figure 6.9
; a cow horn anode weighs
189 kg.
°
6.9 ALLOWABLE TOLERANCE FOR ANODE DIMENSIONS
In most cases, the anode tubular core shall be 80 mm, Schedule 80 pipe, extend-
ing for the full length of the anode casting, having a minimum stand-off height
of 300 mm and being fabricated from ASTM 106 Grade B or similar material.
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