1
Scope
2
Normative
References
1
3
Terms
and
Definitions
2
4
Pressure-relieving
Devices
4
Pressure-relief
Valve
...........................................................................................................................................
Direct-acting
Pressure-relief
Valve
....................................................................................................................
6
Pilot-operated
Pressure-relief
Valves
..............................................................................................................
10
Rupture
Disk
Device
...........................................................................................................................................
11
Pin
-actuated
Devices
........................................................................................................................................
22
2
3
4
5
6
.1
.2
.3
4
.5
.6
.7
.8
3
Causes
of
Improper
Performance
....................................................................................................................
23
Corrosion
............................................................................................................................................................
23
Damaged
Seating
Surfaces
..............................................................................................................................
27
Failed
Springs
....................................................................................................................................................
28
Improper
Setting
and
Adjustment
....................................................................................................................
30
Plugging
and
Fouling
........................................................................................................................................
30
Galling
..................................................................................................................................................................
34
Misapplication
of
Materials
..............................................................................................................................
34
Improper
Location,
History,
or
Identification
..................................................................................................
34
Improper
Handling
..............................................................................................................................................
34
Improper
Differential
Between
Operating
and
Set
Pressures
......................................................................
37
Improper
Inlet/Outlet
Piping
Test
Procedures
................................................................................................
37
6
Inspection
and
Testing
......................................................................................................................................
37
6.1
Reasons
for
Inspection
and
Testing
................................................................................................................
37
6.2
Shop
Inspection/Overhaul
................................................................................................................................
38
6.3
Inspection,
Testing,
Maintenance,
and
Setting
of
Direct-acting
SpringJoaded
Valves
on
Equipment
・・
48
6.4
Inspection,
Testing,
Maintenance,
and
Setting
of
Direct
Spring-operated
Safety
Valves
Used
on
Fired
Pressure
Vessels
................................................................................................................................
50
6.5
Inspection,
Testing,
Maintenance,
and
Setting
of
Pilot*operated
Pressure-relief
Valves
..........................
51
6.6
Inspection,
Testing,
Maintenance,
and
Setting
of
Weight-loaded
Pressure
and/or
Vacuum
Vents
on
Tanks
..............................................................................................................................................................
52
7
Inspection
and
Replacement
of
Rupture
Disk
Devices
................................................................................
53
7.1
Rupture
Disk
Removal
and
Replacement
........................................................................................................
53
7.2
Examples
of
Rupture
Disk
Failure
Modes
......................................................................................................
53
7.3
Rupture
Disk
Holder
..........................................................................................................................................
57
7.4
Inspection
and
Replacement
of
Rupture
Disks
..............................................................................................
57
8
Pressure-relief
Valve
Visual
On-stream
Inspection
........................................................................................
57
8.1
Ge
neral
................................................................................................................................................................
57
8.2
Post-relief
Event
................................................................................................................................................
58
9
Inspection
Frequency
........................................................................................................................................
58
9.1
Ge
neral
................................................................................................................................................................
58
9.2
Frequency
of
Shop
Inspection/Overhaul
........................................................................................................
59
9.3
Time
of
Inspection
..............................................................................................................................................
60
9.4
Inspection
and
Servicing
Deferral
....................................................................................................................
61
