IMO
2/19
IMO-R26 EN
3
1.
SCOPE
This manual contains guidance for inspecting Jamesbury
tank car ball valve components and determining their
acceptability for continued service. These instructions
shall be used in conjunction with the specific Installation,
Maintenance and Operation (IMO) manual for the ball valve
under repair.
2.
WARNINGS
PRIOR TO READING THESE INSTRUCTIONS, READ AND UNDERSTAND
THE SPECIFIC IMO FOR THE TANK CAR VALVE BEING REPAIRED.
FOLLOW ALL DISASSEMBLY INSTRUCTIONS IN THE SPECIFIC IMO
FOR THE TANK CAR VALVE BEING REPAIRED.
IF YOU HAVE ANY QUESTIONS CONCERNING THE USE, APPLICATION
OR COMPATIBILITY OF THE VALVE WITH THE INTENDED SERVICE,
CONTACT METSO FOR MORE INFORMATION.
DO NOT EXCEED THE VALVE PERFORMANCE LIMITATIONS!
EXCEEDING THE PRESSURE OR TEMPERATURE LIMITATIONS MARKED
ON THE VALVE IDENTIFICATION PLATE MAY CAUSE DAMAGE AND
LEAD TO UNCONTROLLED PRESSURE RELEASE. DAMAGE OR
PERSONAL INJURY MAY RESULT.
WHEN HANDLING THE VALVE ASSEMBLY, TAKE ITS WEIGHT INTO
ACCOUNT! PLACE LIFTING DEVICES SECURELY AROUND THE VALVE
BODY. FAILURE TO FOLLOW THESE INSTRUCTIONS MAY RESULT IN
DAMAGE OR PERSONAL INJURY FROM FALLING PARTS.
3.
GENERAL
All used soft goods (seats, packing, seals, bearings, and
orings) shall be replaced with using OEM parts. For a list of
repair/service kits, see the specific IMO manual for the ball
valve under repair.
WARNING
THE USE OF NON-OEM PARTS IN THE REPAIR OF A
JAMESBURY
TANK
CAR BALL VALVE CAN RESULT IN POOR PERFORMANCE, INCREASED
MAINTENANCE FREQUENCY AND/OR FIELD FAILURES RESULTING IN
EQUIPMENT DAMAGE OR PERSONAL INJURY.
4.
VALVE CLEANING
All valve components shall be clean and free of debris.
Valve shall be cleaned using a media compatible solution.
Cleaning methods shall not damage the components or
their sealing surfaces.
5.
GENERAL VALVE INSPECTION
Valve components shall be replaced using ONLY OEM parts.
Inspect all ball valve components for damage before
reassembling valve.
Proper lighting shall be used when inspecting parts.
Inspection mirrors may be used to achieve necessary angle
of view.
Sealing Surfaces are areas on the valve components which
are critical to the valve sealing performance. Sealing surfaces
are shown in
Figures 2 through 5
. Seat sealing critical areas
are the portion of the sealing surface defined in
Figure 6
.
No damage as defined in sealing area criteria (5.1) shall be
allowed on these surfaces.
Functional Surfaces are areas on the valve components
which are critical to the valve performance, fit and/or
assembly of the product. Functional surfaces are shown in
Figures 2 through 5
as dotted line.
5.1
Sealing Area Criteria:
NOTE:
The repair facility must use their own judgment and
experience when evaluating damage severity in sealing
areas. Metso recommends that all repairs be confirmed by
gas testing for shell and seat leakage.
NOTE:
Where specific areas of sealing surfaces are identified
as critical (e.g. Seat sealing areas in
Figure 6
), the inspection
criteria applies to the critical areas only and not the entire
surface.
Corrosion- Pitting and/or raised corrosion products on
sealing surfaces are not acceptable.
Staining- Staining is light corrosion that can be visually
detected but not felt with a fingernail. Staining is acceptable
on seat sealing areas.
Scratches- Scratches are visually noticeable, mechanical
damage, deep enough to catch a finger nail in. Damage
that will “catch” a fingernail or that produces raised material
(such as dents) are not acceptable in sealing areas.
Light scratches- Light scratches are scratches that can be
visually detected and can be felt with a fingernail but in
which the fingernail does not “catch”. Light scratches can
be acceptable in static sealing areas only when oriented
concentric to the seal and not across the seal (which could
provide a path for leakage past the seal).
Rub Marks- Rub marks are marks that typically appear in the
ball wiping zone. The marks can be visually detected but not
felt with a fingernail and are acceptable on ball sealing and
wiping zones.
Damage- Damage consists of scratches, galling, pitting,
cracks, corrosion and /or voids.
