Insulated Piping Systems Susceptible to CUI

Certain areas and types of piping systems are potentially
more susceptible to CUI, including the following:

a. Areas exposed to mist overspray from cooling water towers.
b. Areas exposed to steam vents.
c. Areas exposed to deluge systems.
d. Areas subject to process spills, ingress of moisture, or acid vapors.
e. Carbon steel piping systems, including those insulated for personnel protection, operating between 25°F–250°F (–4°C–120°C). CUI is particularly aggressive where operating temperatures cause frequent or continuous condensation and re-evaporation of atmospheric moisture.
f. Carbon steel piping systems that normally operate in-service above 250°F (120°C) but are in intermittent service.
g. Deadlegs and attachments that protrude from insulated piping and operate at a different temperature than the operating temperature of the active line.
h. Austenitic stainless steel piping systems operating between 150°F–400°F (65°C–204°C). (These systems are susceptible to chloride stress corrosion cracking.)
i. Vibrating piping systems that have a tendency to inflict damage to insulation jacketing providing a path for water ingress.
j. Steam traced piping systems that may experience tracing leaks, especially at tubing fittings beneath the insulation.
k. Piping systems with deteriorated coatings and/or wrappings.