8 - Damage Mechanisms and Failure Modes Flashcards
Identification of Damage Mechanisms:
Identification of the ,,,,, and ,,,,, for equipment included in a risk analysis is essential to the quality and the effectiveness of the risk analysis
credible damage 3 mechanisms
failure modes
Identification of Damage Mechanisms:
The RBI team shall consult with,,,,,, to define the equipment damage mechanisms, damage modes (optional), and potential failure modes
a corrosion specialist
Identification of Damage Mechanisms:
The term …….is used in some industries to identify a subset of mechanisms that
are dependent upon long-term exposure at specific temperatures or cyclic stresses
“aging mechanism”
Identification of Damage Mechanisms:
It is often possible to have two or more damage mechanisms at work on the same piece of equipment For example; ,,,,,
SCC in combination with (thinning or pitting).
Damage Mechanisms:
Understanding ,,,,,, and the interaction with the ,,,,,, (both internal and external) and mechanical environment is key to identifying damage mechanisms.
equipment operation
process environment
Damage Mechanisms:
,,,,, can provide useful input
(such as the spectrum of process conditions, injection points, etc.) to aid ,,,, in the identification of credible damage mechanisms and rates.
Process specialists
corrosion specialists
Damage Mechanisms:
localized thinning may be caused by the method of ,,,,,
fluid injection
Failure Modes:
local thinning could lead to a ,,,,, in the pressure-containing boundary.
pinhole leak
Failure Modes:
cracking could lead to a ,,,,, crack with a leak before break scenario or could lead to ,,,,,
through-wall
a rupture
Failure Modes:
Examples of failure modes include the following;
a) pinhole leak,
b) small to moderate leak,
c) large leak,
d) ductile rupture,
e) brittle fracture
Accumulated Damage:
,,,,,,, damage by one mechanism may progress to a point at which a different mechanism
takes over and begins to dominate the rate of damage
Accumulated Damage:
