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TRANSCRIPT
© Matthews Engineering Training Ltd
API 580 CERT
Slide 1
API 580 RISK-BASED INSPECTION
A course programme by :
ATTHEWS ENGINEERING TRAINING LTD
MATTHEWS ENGINEERING TRAINING LTD is an authorized global training provider to ASME
A QUICK SAMPLE FROM THE POF and COF sections
© Matthews Engineering Training Ltd
API 580 CERT
Slide 2
API 580 SECTIONS 9,10
• Sec 9 :DMs/FMs
• Sec 10 :POF
Core of the RBI analysis
© Matthews Engineering Training Ltd
API 580 CERT
Slide 3
API 580 SEC 9
Deterioration (damage)
Mechanisms and Failure Modes
API 580 Sec 9
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API 580 CERT
Slide 4
DON’T CONFUSE DMs AND FAILURE MODES
The failure mode is the manner of failure (hole, split etc)
The DM is is the type of deterioration that leads to the failure (corrosion, thinning, fatigue etc)
API 580 Sec 9
© Matthews Engineering Training Ltd
API 580 CERT
Slide 5
DMs
Identifying (DMs) is a major part of the RBI activity
581 Full list of DMs are in
API 581
Wide-ranging and specialised
Simplified list in 580 Definition:
A DM can lead to loss of containment
API 580 Sec 9
© Matthews Engineering Training Ltd
API 580 CERT
Slide 6
API 580 SEC 9
PROBABILITY OF FAILURE
POF
POF
COF
POF is one of the axes on the RBI matrix
API 580 Sec 9.1
All the relevant (multiple) DMs have to be taken into account
© Matthews Engineering Training Ltd
API 580 CERT
Slide 7
POF IS BEST EXPRESSED AS A FREQUENCY
POF
Frequency =No of events (quantitative) occurring within a specific time frame
e.g.
API 580 Sec 10
0.00002 failures per year
0.003 failures per operating period
POF units can be expressed qualitatively (e.g. 1 to 4),as long as the categories are sufficiently
spread (order of magnitude between them) 1 2 3 4
© Matthews Engineering Training Ltd
API 580 CERT
Slide 8
FACTORS AFFECTING POF
POF
DMs on the equipment
Effectiveness of the inspection programme used to find the DMs
Not so obvious
API 580 Sec 10
© Matthews Engineering Training Ltd
API 580 CERT
Slide 9
INFLUENCE OF DMs
Remember :the DM must be related to a failure mode that it will cause (hole, split etc)
Those causing wall-thinning (corrosion,
pitting etc)
Others (SCC etc) causing cracks
API 580 Sec 10
Note the typical linked examples given in Sec 10
(engineering common-sense)
© Matthews Engineering Training Ltd
API 580 CERT
Slide 10
FAILURE MODE
FAILURE MODE MAINLY AFFECTS THE CONSEQUENCES (so we will consider it again later in Sec 11:COF)
© Matthews Engineering Training Ltd
API 580 CERT
Slide 11
FACTORS AFFECTING POF
Effectiveness of the inspection programme used to find DMs CAN BE LIMITED BY:
API 580 Sec 10
• Incomplete coverage (e.g. NDT)
• Technique limitations (0.5mm crack limit?)
• Some DMs occur too quick for detection (fatigue ,SCC cracking etc)
= IT IS IMPORTANT TO USE THE CORRECT NDT