Chemical Engineering March 2019 - 32

Cover Story
Part 1
Non-Destructive Testing:
Managing Corrosion
Under Insulation
Corrosion under insulation (CUI) creates a pervasive and versatile challenge to the integrity of
insulated equipment, but non-destructive inspection can help to avoid undesirable CUI surprises
Ana Benz,
Fadi Basma
and Michael
Townsend
IRISNDT
IN BRIEF
RISK-BASED INSPECTION
GENERAL NDE
SELECTION
DIGITAL TECHNOLOGIES
C
refineries,
32
orrosion under insulation (CUI)
has been occurring ever since
industry started insulating equipment.
However, most of the CUI
reported until the 1970s developed in stainless
steel due to stress-corrosion cracking.
At that time, with limited insulation, carbonsteel
equipment did not develop significant
CUI [1]. Since then, with higher energy
costs, carbon-steel piping, tanks and vessels
have been more intensively insulated
to save on energy costs, and as a result,
they have begun to develop CUI.
CUI is a common problem for petroleum
petrochemical
facilities,
plants and chemical and fertilizer
power
plants.
FIGURE 1. This horizontal, coated 0.375-in.-thick pipe leaked
due to CUI after only four years of service
One's predisposition could be to consider
CUI as a problem that is isolated only to sites
in close proximity to a marine environment,
but this is not always the case. CUI can happen
in dry industrial sites as far away from
the sea as the Canadian prairies (Figure 1).
Once equipment is insulated, the proximity
to cooling towers, leaking heat tracing, rain,
mist from melting snow that saturates insulation
and other leaks or steam can have an
impact on CUI.
CUI can remain undetected until a leak
develops or until the insulation and cladCHEMICAL
ENGINEERING WWW.CHEMENGONLINE.COM
MARCH 2019

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Chemical Engineering March 2019

Table of Contents for the Digital Edition of Chemical Engineering March 2019

Contents
Chemical Engineering March 2019 - Cover1
Chemical Engineering March 2019 - Cover2
Chemical Engineering March 2019 - Contents
Chemical Engineering March 2019 - 2
Chemical Engineering March 2019 - 3
Chemical Engineering March 2019 - 4
Chemical Engineering March 2019 - 5
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Chemical Engineering March 2019 - Cover3
Chemical Engineering March 2019 - Cover4
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