20 API RECOMMENDED PRACTICE 2D
Lubricate components and correct deÞciencies as required
based on the results of these inspections. Document these
results per section 4.2.2.
C.4.1.2c Quarterly inspections (performed by a qualiÞed
inspector) may include but not be limited to the following
actions:
1. Check all ßuid levels of prime mover.
2. Check control mechanisms including brakes and
clutches for proper operation.
3. Visually check for hoist lubricant oil leakage. In hoists
where a sight glass is provided, also check the ßuid level.
4. Visually check for leakage or damage in the air and nonmechanical
systems.
5. Check the following devices where applicable:
a. Boom Hoist Pawl.
b. Helicopter Warning Light.
c. Crane Hook Latch.
6. Perform a walk-around visual examination of the crane
boom and support structure to ensure that no visual damage
exists.
7. Ensure the correct load-rating chart for the conÞguration
in use is visible to the crane operator at the primary control
station.
8. Visually check wire rope for evident deterioration and
damage, or improper reeving.
9. Visually check for loose, missing, or corroded bolts,
pins, keepers or cotter pins.
10. Visually check rigging gear to be used, such as slings,
sling hooks and shackles.
11. Further check all control mechanisms for proper
adjustment, excessive wear of components, and contamination
by foreign matter.
12. Check appropriate electrical apparatus for proper function.
13. Check boom hoist limit and anti-two block devices for
proper operation. Care should be exercised to prevent damage
to crane components.
14. Boom should be inspected for bent chord members,
missing or broken lacing and cracked welds on critical members.
Boom section end connections should be inspected for
cracked welds, deformation and corrosion.
15. Check boom angle/radius indicators over full range for
accuracy.
16. Sheaves should be inspected for wear, cracks, and rope
path alignment and bearing condition.
17. Check power plants for proper performance and compliance
with safety requirements.
18. Check belts and chains for proper adjustment.
19. Visually check crane hooks for deformation, and discard
if deformations exceed the manufacturerÕs recommendations.
20. Inspect wire rope as per 5.1.2.
21. Check lubricant level in all hoists and slew drives,
including those not Þtted with sight glasses.
Lubricate components and correct deÞciencies as required
based on the results of these inspections. Document these
results per section 4.2.2. Oil sample analysis, as suggested by
the hoist manufacturer, is intended primarily to evaluate its
mechanical integrity. Oil sample analysis need not necessarily
mean a laboratory analysis. It can be effectively achieved
by qualitative tests performed in the Þeld by a qualiÞed
inspector or operator (such as cheese cloth, smell and texture
tests).
C.4.1.2d Annual inspections (performed by a qualiÞed
inspector) will include pre-use, monthly, and quarterly
Inspections, as well as inspections of critical crane components.
A basic guideline for annual inspections should consider,
but not be limited to, the following actions:
1. Check all ßuid levels of prime mover.
2. Check control mechanisms including brakes and
clutches for proper operation.
3. Visually check for hoist lubricant oil leakage. In hoists
where a sight glass is provided, also check the ßuid level.
4. Visually check for leakage or damage in the air and
non-mechanical systems.
5. Check the following devices where applicable:
a. Boom Hoist Pawl.
b. Helicopter Warning Light.
c. Crane Hook Latch.
6. Perform a walk-around visual examination of the crane
boom and support structure to ensure that no visible damage
exists.
7. Ensure the correct load-rating chart for the conÞguration
in use is visible to the crane operator at the primary
control station.
8. Visually check wire rope for evident deterioration and
damage, or improper reeving.
9. Visually check for loose, missing, or corroded bolts,
pins, keepers or cotter pins.
10. Visually check rigging gear to be used, such as slings,
sling hooks and shackles.
11. Further check all control mechanisms for proper
adjustment, excessive wear of components, and contamination
by foreign matter.
12. Check appropriate electrical apparatus for proper
function.
13. Check boom hoist limit and anti-two block devices
for proper operation. Care should be exercised to prevent
damage to crane components.
14. Boom should be inspected for bent chord members,
missing or broken lacing and cracked welds on critical
members. Boom section end connections should be
inspected for cracked welds, deformation and corrosion.
Copyright American Petroleum Institute
Reproduced by IHS under license with API
Document provided by IHS Licensee=Unocal/5958404001, 04/20/2004 22:22:06 MDT
Questions or comments about this message: please call the Document Policy Group
at 303-397-2295.
--````,,,,,``,,,,,,`,`,`,,````,-`-`,,`,,`,`,,`---
RECOMMENDED PRACTICE FOR OPERATION AND MAINTENANCE OF OFFSHORE CRANES 21
15. Check boom angle/radius indicators over full range
for accuracy.
16. Sheaves should be inspected for wear, cracks, and
rope path alignment and bearing condition.
17. Check power plants for proper performance and compliance
with safety requirements.
18. Check belts and chains for proper adjustment.
19. Visually check crane hooks for deformation, and discard
if deformations exceed those manufacturersÕ
recommendations.
20. Inspect wire rope as per 5.1.2.
21. Check lubricant level in all hoists and slew drives,
including those not Þtted with sight glasses.
Lubricate components and correct deÞciencies as required
based on the results of these inspections. Document these
results per section 4.2.2. Oil sample analysis, as suggested by
the hoist manufacturer, is intended primarily to evaluate its
mechanical integrity. Oil sample analysis need not necessarily
mean a laboratory analysis. It can be effectively achieved
by qualitative tests performed in the Þeld by a qualiÞed
inspector or operator (such as cheese cloth, smell and texture
tests).
Inspection of critical crane components: The annual
inspection of critical components appropriate for an individual
machine will differ, depending on the crane type and
design of the individual components. A basic guideline for
inspection of critical crane components should consider but
not be limited to the following:
22. Hoist AssembliesÑAnnual inspection and maintenance
of the hoist should be determined by the owner as a
function of the hoist type, past and anticipated duty cycle,
and condition. The quality of the hoist lubricant is considered
a primary indicator of the mechanical integrity of the
hoist. Brakes should be tested by stalling the drive. See
Appendix D, Commentary on Spring-Set Hoist Brakes,
for additional recommendations for spring-set hoist
brakes.
23. FoundationÑWeldments in the craneÕs pedestal and
supporting deck structure should be visually examined for
fracture, deformation and corrosion. Special attention
should be paid to areas of rust and cracked paint.
24. Swing Circle AssemblyÑThe swing circle assembly
is the connecting component between the crane revolving
upperstructure and the pedestal. Consequently, regular
inspections are paramount to insure a long and safe operational
life.
There are three (3) main types of swing circle assemblies
typically used on pedestal-mounted cranes:
¥ Hook and roller assemblies
¥ King posts
¥ Ball/roller bearings
The inspection procedure for each varies signiÞcantly and
should be tailored, not only to Þt the type of swing circle
assembly, but also for the physical and operational environment
of each particular crane and platform.
Regardless of the type of swing circle assembly, the objective
of any inspection is to determine and monitor wear,
fatigue, corrosion, and the overall operational condition. The
crane and swing circle assembly manufacturers are the best
sources for information in developing the inspection program.
The following are suggested inspection guidelines for
each type of swing circle assembly.
Hook and Roller Assemblies
Ring Gear:
a. Center pin and bushing condition should be veriÞed and
monitored for wear. Center pin wear is generally due to
improperly or unevenly adjusted hook rollers.
b. Proper lubrication of center pin bushing should be
veriÞed.
c. Obvious wear between ring gear teeth and swing pinion
gear would indicate center pin wear and improperly adjusted
hook rollers.
d. Excessive lateral wallowing, wobbling, or loud popping
noise of machine base or frame indicates center pin bushing
wear.
Hook Rollers:
a. Hook rollers to turntable clearance should not exceed
manufacturer speciÞcations.
b. Hook rollers should be evenly adjusted to minimize
uneven stress and wear on center pin and center pin bushing.
c. Hook roller path should be smooth, ßat, and have no
ridges or dents that would cause uneven load distribution.
d. Hook rollers should be concentric with no ßat spots.
e. Bearings should be well lubricated and should roll
smoothly with no noticeable popping or grinding noise.
Hook Roller Brackets, Bracket Pads, and Bolts:
a. Machine should be tilted fully in both directions noting
any deßection between the hook roller bracket and the
machined surface of the main frame pad where the hook
roller bracket mounts. Consult manufacturer for tolerances.
Note: Forged castings that comprises hook roller brackets
very seldom bend or distort; i.e. the main frame generally
yields, thus causing obvious deßection or gap.
b. Hook roller bracket bolts should be checked for proper
bolt torque, excess stretching, excess rust pitting, improper
size, etc.
King Post
Bearing areas of the crane should be inspected to assure
that there is no signiÞcant wear or damage to either the rotating
or stationary load bearing members, that left uncorrected,
might result in a loss of structural integrity of the mounting
system. The king post crane inspection procedure will depend
on the design of the crane being i
20 API 20 API RECOMMENDED PRACTICE 2D
ส่วนประกอบหล่อลื่นและ Lubricate components and correct deÞciencies as required
based on the results of these inspections. Document these
results per section 4.2.2.
C.4.1.2c Quarterly inspections (performed by a qualiÞed
inspector) may include but not be limited to the following
actions:
1. Check all ßuid levels of prime mover.
2. Check control mechanisms including brakes and
clutches for proper operation.
3. Visually check for hoist lubricant oil leakage. In hoists
where a sight glass is provided, also check the ßuid level.
4. Visually check for leakage or damage in the air and nonmechanical
systems.
5. Check the following devices where applicable:
a. Boom Hoist Pawl.
b. Helicopter Warning Light.
c. Crane Hook Latch.
6. Perform a walk-around visual examination of the crane
boom and support structure to ensure that no visual damage
exists.
7. Ensure the correct load-rating chart for the conÞguration
in use is visible to the crane operator at the primary control
station.
8. Visually check wire rope for evident deterioration and
damage, or improper reeving.
9. Visually check for loose, missing, or corroded bolts,
pins, keepers or cotter pins.
10. Visually check rigging gear to be used, such as slings,
sling hooks and shackles.
11. Further check all control mechanisms for proper
adjustment, excessive wear of components, and contamination
by foreign matter.
12. Check appropriate electrical apparatus for proper function.
13. Check boom hoist limit and anti-two block devices for
proper operation. Care should be exercised to prevent damage
to crane components.
14. Boom should be inspected for bent chord members,
missing or broken lacing and cracked welds on critical members.
Boom section end connections should be inspected for
cracked welds, deformation and corrosion.
15. Check boom angle/radius indicators over full range for
accuracy.
16. Sheaves should be inspected for wear, cracks, and rope
path alignment and bearing condition.
17. Check power plants for proper performance and compliance
with safety requirements.
18. Check belts and chains for proper adjustment.
19. Visually check crane hooks for deformation, and discard
if deformations exceed the manufacturerÕs recommendations.
20. Inspect wire rope as per 5.1.2.
21. Check lubricant level in all hoists and slew drives,
including those not Þtted with sight glasses.
Lubricate components and correct deÞciencies as required
based on the results of these inspections. Document these
results per section 4.2.2. Oil sample analysis, as suggested by
the hoist manufacturer, is intended primarily to evaluate its
mechanical integrity. Oil sample analysis need not necessarily
mean a laboratory analysis. It can be effectively achieved
by qualitative tests performed in the Þeld by a qualiÞed
inspector or operator (such as cheese cloth, smell and texture
tests).
C.4.1.2d Annual inspections (performed by a qualiÞed
inspector) will include pre-use, monthly, and quarterly
Inspections, as well as inspections of critical crane components.
A basic guideline for annual inspections should consider,
but not be limited to, the following actions:
1. Check all ßuid levels of prime mover.
2. Check control mechanisms including brakes and
clutches for proper operation.
3. Visually check for hoist lubricant oil leakage. In hoists
where a sight glass is provided, also check the ßuid level.
4. Visually check for leakage or damage in the air and
non-mechanical systems.
5. Check the following devices where applicable:
a. Boom Hoist Pawl.
b. Helicopter Warning Light.
c. Crane Hook Latch.
6. Perform a walk-around visual examination of the crane
boom and support structure to ensure that no visible damage
exists.
7. Ensure the correct load-rating chart for the conÞguration
in use is visible to the crane operator at the primary
control station.
8. Visually check wire rope for evident deterioration and
damage, or improper reeving.
9. Visually check for loose, missing, or corroded bolts,
pins, keepers or cotter pins.
10. Visually check rigging gear to be used, such as slings,
sling hooks and shackles.
11. Further check all control mechanisms for proper
adjustment, excessive wear of components, and contamination
by foreign matter.
12. Check appropriate electrical apparatus for proper
function.
13. Check boom hoist limit and anti-two block devices
for proper operation. Care should be exercised to prevent
damage to crane components.
14. Boom should be inspected for bent chord members,
missing or broken lacing and cracked welds on critical
members. Boom section end connections should be
inspected for cracked welds, deformation and corrosion.
Copyright American Petroleum Institute
Reproduced by IHS under license with API
Document provided by IHS Licensee=Unocal/5958404001, 04/20/2004 22:22:06 MDT
Questions or comments about this message: please call the Document Policy Group
at 303-397-2295.
--````,,,,,``,,,,,,`,`,`,,````,-`-`,,`,,`,`,,`---
RECOMMENDED PRACTICE FOR OPERATION AND MAINTENANCE OF OFFSHORE CRANES 21
15. Check boom angle/radius indicators over full range
for accuracy.
16. Sheaves should be inspected for wear, cracks, and
rope path alignment and bearing condition.
17. Check power plants for proper performance and compliance
with safety requirements.
18. Check belts and chains for proper adjustment.
19. Visually check crane hooks for deformation, and discard
if deformations exceed those manufacturersÕ
recommendations.
20. Inspect wire rope as per 5.1.2.
21. Check lubricant level in all hoists and slew drives,
including those not Þtted with sight glasses.
Lubricate components and correct deÞciencies as required
based on the results of these inspections. Document these
results per section 4.2.2. Oil sample analysis, as suggested by
the hoist manufacturer, is intended primarily to evaluate its
mechanical integrity. Oil sample analysis need not necessarily
mean a laboratory analysis. It can be effectively achieved
by qualitative tests performed in the Þeld by a qualiÞed
inspector or operator (such as cheese cloth, smell and texture
tests).
Inspection of critical crane components: The annual
inspection of critical components appropriate for an individual
machine will differ, depending on the crane type and
design of the individual components. A basic guideline for
inspection of critical crane components should consider but
not be limited to the following:
22. Hoist AssembliesÑAnnual inspection and maintenance
of the hoist should be determined by the owner as a
function of the hoist type, past and anticipated duty cycle,
and condition. The quality of the hoist lubricant is considered
a primary indicator of the mechanical integrity of the
hoist. Brakes should be tested by stalling the drive. See
Appendix D, Commentary on Spring-Set Hoist Brakes,
for additional recommendations for spring-set hoist
brakes.
23. FoundationÑWeldments in the craneÕs pedestal and
supporting deck structure should be visually examined for
fracture, deformation and corrosion. Special attention
should be paid to areas of rust and cracked paint.
24. Swing Circle AssemblyÑThe swing circle assembly
is the connecting component between the crane revolving
upperstructure and the pedestal. Consequently, regular
inspections are paramount to insure a long and safe operational
life.
There are three (3) main types of swing circle assemblies
typically used on pedestal-mounted cranes:
¥ Hook and roller assemblies
¥ King posts
¥ Ball/roller bearings
The inspection procedure for each varies signiÞcantly and
should be tailored, not only to Þt the type of swing circle
assembly, but also for the physical and operational environment
of each particular crane and platform.
Regardless of the type of swing circle assembly, the objective
of any inspection is to determine and monitor wear,
fatigue, corrosion, and the overall operational condition. The
crane and swing circle assembly manufacturers are the best
sources for information in developing the inspection program.
The following are suggested inspection guidelines for
each type of swing circle assembly.
Hook and Roller Assemblies
Ring Gear:
a. Center pin and bushing condition should be veriÞed and
monitored for wear. Center pin wear is generally due to
improperly or unevenly adjusted hook rollers.
b. Proper lubrication of center pin bushing should be
veriÞed.
c. Obvious wear between ring gear teeth and swing pinion
gear would indicate center pin wear and improperly adjusted
hook rollers.
d. Excessive lateral wallowing, wobbling, or loud popping
noise of machine base or frame indicates center pin bushing
wear.
Hook Rollers:
a. Hook rollers to turntable clearance should not exceed
manufacturer speciÞcations.
b. Hook rollers should be evenly adjusted to minimize
uneven stress and wear on center pin and center pin bushing.
c. Hook roller path should be smooth, ßat, and have no
ridges or dents that would cause uneven load distribution.
d. Hook rollers should be concentric with no ßat spots.
e. Bearings should be well lubricated and should roll
smoothly with no noticeable popping or grinding noise.
Hook Roller Brackets, Bracket Pads, and Bolts:
a. Machine should be tilted fully in both directions noting
any deßection between the hook roller bracket and the
machined surface of the main frame pad where the hook
roller bracket mounts. Consult manufacturer for tolerances.
Note: Forged castings that comprises hook roller brackets
very seldom bend or distort; i.e. the main frame generally
yields, thus causing obvious deßection or gap.
b. Hook roller bracket bolts should be checked for proper
bolt torque, excess stretching, excess rust pitting, improper
size, etc.
King Post
Bearing areas of the crane should be inspected to assure
that there is no signiÞcant wear or damage to either the rotating
or stationary load bearing members, that left uncorrected,
might result in a loss of structural integrity of the mounting
system. The king post crane inspection procedure will depend
on the design of the crane being i
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