The insulator system typically consists of a thermal substance and a thin metal sheathing,
Typical insulation material is low in density to limit air movement, and some contain
gases to minimize the heat flow. This latter type of insulation hold moisture like
a sponge. Even in non-sponge like insulator materials, when water intrudes under
the insulator, it accumulates in the lower portion of the pipelines, tanks, flanges
or equipment, resulting in corrosion and leaks.
It is not economical, and highly time consuming to visually inspect by removing the
thermal insulation of a few hundreds metres of pipelines. A number of non-destructive
inspection methods have been used to inspect for CUI, including acoustic emission,
infrared imaging, radiography, ultrasonic testing, eddy current techniques.
However, some pipelines are a few kilometres long, and some pipelines are positioned
30 to 40 metre above ground, which will requires scaffoldings. Furthermore, inspections
are difficult due to the limited access in highly congested areas. In some cases,
CUI is found in a few percent of an entire pipeline after several years of inspection
time. When visual inspection is carried out by removing the insulation, the integrity
of the water tightness is sometimes disrupted.
Since the locations of CUI caused by water leakages are basically unpredictable,
monitoring CUI in selected areas and partial visual inspections may miss some of
the CUI locations, resulting in serious accidents. Therefore, large amounts of accurate
CUI data from the entire pipelines or tanks must be collected with a minimum man-power.
CUI Warning System include a long-lasting battery powered wireless sensors to transmit
the data indicating the existences of corrosion electrolyte (water and moisture)
on the CUI Sensor Tapes.
CUI Warning System provides the frequency and duration of wet time to determine the
risk of CUI for any portions or the entire structure of pipeline, tank or equipment
in your plant.
CUI CP Shield is designed to provide galvanic cathodic protection (CP) and barrier
protection to steel pipes, vessels and equipment under insulation. The corrosion
protection os achieved using the water that causes CUI.
By combining the following features using sacrificial zinc and aluminium anodes and
corrosion resistance aluminium barrier, a highly cost-effective CUI protection system