A-Frame & Hoisting System Components

1

A-frame Oil tube stabbing board Pin

φ100×400

111.53.400.01

40CrNiMoA Alloy Steel

1. Alternating shear load under long-term A-frame operation; 2. Corrosion caused by drilling fluid and marine salt spray; 3. Dimensional deviation due to improper installation leading to uneven stress distribution.

1. Conduct non-destructive testing (NDT) for cracks every 3 months of operation; 2. Apply anti-corrosion grease compatible with alloy steel regularly in corrosive environments; 3. Ensure the matching of pin and hole dimensions before installation, and avoid forced assembly; 4. Check the matching locknut and cotter pin status regularly to prevent pin loosening and abnormal wear.

2

Pin

φ70×380

111.53.400.02

40Cr Alloy Steel

1. Fatigue wear caused by repeated folding and lifting of A-frame; 2. Abrasion between pin and bushing due to lack of lubrication; 3. Impact damage during equipment transportation and installation.

1. Fill high-temperature resistant lubricating oil between pin and bushing every 1 month; 2. Install protective sleeves during transportation to avoid direct impact on pin surface; 3. Control the lifting and folding speed of A-frame to reduce impact load on pins; 4. Replace pins immediately if surface wear depth exceeds 0.5mm.

3

Pin

φ100×480

111.53.400.03

40CrNiMoA Alloy Steel

1. High-load shear during heavy oil tube lifting; 2. Corrosion and oxidation caused by long-term exposure to outdoor and humid environments; 3. Stress concentration caused by surface scratches and defects.

1. Strictly abide by the rated load of the pin, and prohibit overloading operation; 2. Regularly polish the pin surface to remove scratches and apply anti-rust paint; 3. Use in conjunction with qualified washers to disperse load and reduce stress concentration; 4. Conduct load testing every 6 months to verify the bearing capacity of the pin.

4

Pin

φ50×105

111.52.00.04

35CrMo Alloy Steel

1. Micro-cracks caused by vibration during hoisting operation; 2. Wear caused by relative rotation between pin and connected parts; 3. Corrosion caused by chemical media in the working environment.

1. Install vibration-damping gaskets at the connection to reduce vibration impact; 2. Check for micro-cracks using magnetic particle testing every 4 months; 3. Avoid contact with strong chemical media, and clean the pin surface in time if contaminated; 4. Ensure the pin is fully seated during installation to prevent partial load.

5

Pin

φ40×90

111.53.380.01

35CrMo Alloy Steel

1. Abrasion due to insufficient lubrication between pin and hole; 2. Fatigue failure caused by long-term cyclic load; 3. Damage caused by improper disassembly and assembly using inappropriate tools.

1. Establish a regular lubrication schedule, and use lubricants that match the working temperature; 2. Record the number of operation cycles, and replace the pin when reaching the specified fatigue life; 3. Use special disassembly tools to avoid damaging the pin thread and surface; 4. Check the fit clearance between pin and hole regularly, and replace the bushing if the clearance exceeds the limit.

1

Safety pin

φ20×150

111.53.00.02

304 Stainless Steel

1. Corrosion caused by marine salt spray and drilling fluid; 2. Fatigue bending caused by long-term vibration; 3. Wear at the pin hole due to repeated insertion and removal during maintenance.

1. Use anti-corrosion spray for maintenance every 2 months in marine and humid environments; 2. Check the straightness of the safety pin regularly, and replace it if there is any bending; 3. Avoid frequent disassembly and assembly, and use appropriate tools to prevent deformation during insertion and removal; 4. Install a protective cover to prevent direct impact and contamination.

2

Safety pin

φ15×90

111.53.00.08

304 Stainless Steel

1. Oxidation and corrosion in high-humidity working environments; 2. Shear damage caused by excessive vibration leading to abnormal stress; 3. Wear caused by friction with the locking groove.

1. Regularly clean the pin surface and apply anti-rust oil; 2. Check the matching degree of the safety pin and the locking groove, and replace the related parts if the groove is worn; 3. Strengthen the inspection of the safety pin during high-vibration operation periods; 4. Replace the safety pin immediately if there is any sign of wear or deformation.

3

Safety pin

φ10×75

111.53.00.05

2Cr13 Stainless Steel

1. Corrosion caused by contact with corrosive media; 2. Bending deformation caused by improper installation and impact; 3. Fatigue failure caused by long-term cyclic load.

1. Avoid contact with strong acids and alkalis, and clean the surface in time if contaminated; 2. Ensure correct installation position, and do not knock the safety pin with heavy objects; 3. Record the service time, and replace it regularly according to the maintenance manual; 4. Check the locking status before each operation to ensure it is fully inserted and locked.

1

A-frame Cantilever sheave

Customized for A-frame cantilever

111.53.406.00

Sheave Body: QT600-3 Ductile Iron; Bearing: GCr15 Bearing Steel

1. Rope groove wear caused by long-term friction with steel wire rope; 2. Bearing damage caused by lack of lubrication and dust intrusion; 3. Impact damage caused by sudden load during hoisting.

1. Regularly check the rope groove wear, and reprocess or replace the sheave when the wear depth exceeds 10% of the steel wire rope diameter; 2. Inject high-temperature resistant grease into the bearing every 20 working hours; 3. Install a dust cover to prevent dust and debris from entering the bearing; 4. Avoid sudden start and stop during hoisting to reduce impact load on the sheave.

2

Fast line sheave assy.

Assembly type

101.51.20.00

Sheave Body: 42CrMo Alloy Steel; Bearing: GCr15SiMn Bearing Steel

1. Severe wear caused by high-speed friction with fast line steel wire rope; 2. Bearing overheating and failure caused by high load and long-term operation; 3. Corrosion caused by harsh working environment (humidity, salt spray).

1. Monitor the surface temperature of the sheave during operation, and stop for inspection if overheating occurs; 2. Use lubricants with good high-temperature resistance and anti-wear performance; 3. Conduct anti-corrosion treatment on the sheave surface regularly; 4. Check the steel wire rope for defects regularly to avoid abnormal wear of the rope groove caused by rope defects.

3

Sheave set assy.

Assembly type

101.51.40.00

Sheave Body: QT600-3 Ductile Iron; Bearing: GCr15 Bearing Steel

1. Uneven wear of multiple rope grooves caused by inconsistent tension of steel wire ropes; 2. Bearing damage caused by dust and impurities; 3. Fatigue damage of sheave body caused by long-term cyclic load.

1. Adjust the tension of each steel wire rope to ensure consistency; 2. Regularly clean the sheave assembly and replace the dust seal; 3. Conduct non-destructive testing on the sheave body every 6 months to check for fatigue cracks; 4. Avoid overloading operation, and strictly abide by the rated load of the sheave set.

4

Auxiliary sheave assy. I

Assembly type

101.51.70.00

Sheave Body: QT500-7 Ductile Iron; Bearing: GCr15 Bearing Steel

1. Wear caused by occasional use but long-term storage and corrosion; 2. Bearing seizure caused by lack of lubrication during long-term storage; 3. Impact damage during installation and disassembly.

1. Apply anti-rust oil and wrap with moisture-proof film during storage; 2. Check and lubricate the bearing before use after long-term storage; 3. Use professional lifting tools during installation and disassembly to avoid collision; 4. Check the rotation flexibility before each use, and stop using if there is any stuck phenomenon.

5

Auxiliary sheave assy. II

Assembly type

101.51.80.00

Sheave Body: QT500-7 Ductile Iron; Bearing: GCr15 Bearing Steel

1. Same as Auxiliary sheave assy. I; 2. Wear caused by contact with irregular workpieces during auxiliary hoisting.

1. Same as Auxiliary sheave assy. I; 2. Use protective sleeves when hoisting irregular workpieces to avoid direct contact with the sheave; 3. Clean the sheave surface in time after use in harsh environments.

6

Wire line stop roller

Customized for wire line

111.53.15.00

Roller Body: 42CrMo Alloy Steel; Shaft: 35CrMo Alloy Steel

1. Wear caused by long-term friction with wire line; 2. Shaft bending caused by lateral force; 3. Corrosion caused by humid environment.

1. Check the roller surface wear regularly, and replace if the wear is excessive; 2. Ensure the wire line runs along the center of the roller to avoid lateral force; 3. Lubricate the shaft and bearing regularly; 4. Apply anti-rust treatment to the roller and shaft surface.

1

U-bolt

M42

111.53.400.04

45# Carbon Steel (Heat Treated)

1. Thread wear caused by repeated assembly and disassembly; 2. Corrosion caused by outdoor environment; 3. Bending deformation caused by excessive clamping force.

1. Use torque wrench to control clamping force during installation, avoiding over-tightening; 2. Apply anti-rust paint to the surface after installation; 3. Check the thread status regularly, and repair or replace if there is wear; 4. Use spring washers to prevent loosening caused by vibration.

2

Slotted nut

M42×3 GB6178-86 (M42×3-8)

-

40Cr Alloy Steel

1. Thread wear caused by long-term vibration; 2. Slot damage caused by improper insertion and removal of cotter pins; 3. Corrosion leading to thread seizure.

1. Match with corresponding cotter pins to ensure reliable locking; 2. Use appropriate tools to insert and remove cotter pins to avoid slot damage; 3. Regularly clean the thread and apply anti-seize agent; 4. Replace the nut if the slot is deformed or the thread is worn.

3

Cotter pin

6.3×65 GB91-86 (6.3×65)

-

Q235 Carbon Steel

1. Bending fatigue caused by vibration; 2. Corrosion caused by humid environment; 3. Shear damage caused by excessive stress.

1. Ensure the cotter pin is fully opened after installation, and the opening angle is not less than 60 degrees; 2. Replace the cotter pin regularly (every 3 months) in humid environments; 3. Check the fit between cotter pin and nut slot, and avoid stress concentration; 4. Do not reuse cotter pins that have been bent multiple times.

4

Slotted Nut

M10 GB6178-1986 (M10-8)

-

35# Carbon Steel

1. Thread wear caused by repeated assembly and disassembly; 2. Slot damage caused by incorrect cotter pin selection; 3. Corrosion leading to thread damage.

1. Select cotter pins of matching specifications; 2. Clean the thread before installation and apply anti-rust oil; 3. Use torque wrench to control the tightening torque; 4. Replace the nut if the thread is slippery or the slot is damaged.

5

Bolt

M10X70 GB/T31.1-1988 (M10X70-8.8)

-

40Cr Alloy Steel (8.8 Grade)

1. Thread wear caused by long-term vibration; 2. Bolt breakage caused by over-tightening; 3. Corrosion caused by harsh environment.

1. Strictly follow the specified torque for installation; 2. Use anti-loosening washers to prevent loosening; 3. Conduct anti-corrosion treatment on the surface; 4. Check the bolt status regularly, and replace if there is any sign of fatigue.

6

Washer

10 GB/T97.1-1986 (10)

-

65Mn Spring Steel

1. Deformation caused by excessive clamping force; 2. Corrosion caused by humid environment; 3. Wear caused by friction with bolt and nut.

1. Do not use deformed washers; 2. Replace washers when they are corroded or worn; 3. Ensure the washer size matches the bolt specification; 4. Install the washer correctly to avoid reverse installation.

7

Cotter pin

φ2.5X20 GB91-86 (2.5X20)

-

Q235 Carbon Steel

1. Bending fatigue caused by vibration; 2. Corrosion caused by humid environment; 3. Damage caused by improper installation.

1. Use pliers to open the cotter pin correctly, avoiding excessive force; 2. Replace regularly in humid and corrosive environments; 3. Ensure the cotter pin is inserted in place; 4. Do not use cotter pins with diameter less than the specified size.

8

Slotted Nut

M30 GB6178-86 (M30-8)

-

40Cr Alloy Steel

1. Thread seizure caused by corrosion; 2. Slot damage caused by cotter pin insertion and removal; 3. Thread wear caused by long-term vibration.

1. Apply anti-seize agent to the thread before installation; 2. Use cotter pins of matching specifications to avoid slot damage; 3. Regularly check the locking status, and re-tighten if necessary; 4. Replace the nut if the thread is damaged or the slot is deformed.

9

Washer

30 GB/T93-87 (30)

-

65Mn Spring Steel

1. Deformation caused by excessive clamping force; 2. Corrosion caused by outdoor environment; 3. Wear caused by friction with the connected parts.

1. Control the tightening torque during installation; 2. Apply anti-rust paint to the surface; 3. Replace the washer if it is deformed or worn; 4. Ensure the washer is flat and free of burrs before installation.

10

Cotter pin

φ6.3X50 GB91-86 (φ6.3X50)

-

Q235 Carbon Steel

1. Shear damage caused by excessive stress; 2. Bending fatigue caused by vibration; 3. Corrosion caused by humid environment.

1. Ensure the cotter pin is of sufficient strength for the application; 2. Check the opening status regularly, and re-open if it is flattened; 3. Replace regularly in humid environments; 4. Avoid using damaged cotter pins.

1

Drawbar

Customized

111.53.411.00

42CrMo Alloy Steel

1. Fatigue damage caused by long-term cyclic load; 2. Corrosion caused by harsh working environment; 3. Wear at the connection caused by vibration.

1. Conduct non-destructive testing for fatigue cracks every 6 months; 2. Apply anti-corrosion paint to the surface regularly; 3. Check the connection status regularly, and replace the connecting pins if worn; 4. Strictly abide by the rated load, and prohibit overloading.

2

Shackle

8.5TS-BX8.5-1

-

20CrMnTi Alloy Steel

1. Wear at the pin and shackle body connection; 2. Deformation caused by overloading; 3. Corrosion caused by marine salt spray and humid environment.

1. Check the wear of the connection before each use, and replace if the wear exceeds the limit; 2. Strictly prohibit overloading, and the lifting angle should not be less than 60 degrees; 3. Apply anti-corrosion grease to the pin regularly; 4. Store in a dry and ventilated place when not in use, and apply anti-rust oil.

3

Eye bolt in tail

M30X120 GB31.1-86 (M30X120-8.8)

-

40Cr Alloy Steel

1. Thread wear caused by repeated assembly and disassembly; 2. Bending deformation caused by lateral load; 3. Corrosion caused by humid environment.

1. Avoid applying lateral load during use, and ensure the load is along the axis; 2. Use torque wrench to control the tightening torque; 3. Regularly check the thread and eye status, and replace if there is wear or cracks; 4. Apply anti-rust treatment to the surface.

4

Eye bolt in head

M16X35 GB32.1-1986 (M16X35-8)

-

35CrMo Alloy Steel

1. Thread wear caused by long-term vibration; 2. Eye damage caused by improper lifting; 3. Corrosion caused by harsh environment.

1. Use lifting tools that match the eye size to avoid eye damage; 2. Check the thread and eye for cracks regularly; 3. Apply anti-rust oil to the thread before installation; 4. Do not use if the eye is deformed or the thread is slippery.

5

Eye bolt in tail

M24X120 GB31.1-86 (M24X120-8.8)

-

40Cr Alloy Steel

1. Same as M30X120 eye bolt in tail; 2. Thread seizure caused by corrosion.

1. Same as M30X120 eye bolt in tail; 2. Apply anti-seize agent to the thread to prevent seizure; 3. Clean the thread in time after use in corrosive environments.

1

Clip

60×φ30×φ3

111.53.00.03

304 Stainless Steel

1. Wear caused by long-term friction with fixed components; 2. Loosening caused by vibration; 3. Corrosion caused by humid and corrosive environments.

1. Check the clamping status regularly, and re-tighten if loose; 2. Apply anti-corrosion spray to the surface in corrosive environments; 3. Ensure the clip size matches the fixed component; 4. Replace the clip if the clamping surface is worn or deformed.

2

Clip

120×φ60×φ6

101.51.00.01

304 Stainless Steel

1. Same as 60×φ30×φ3 clip; 2. Deformation caused by excessive clamping force.

1. Same as 60×φ30×φ3 clip; 2. Use torque wrench to control clamping force, avoiding over-tightening; 3. Use rubber gaskets between the clip and the fixed component to reduce friction.

3

Pressboard

δ50

111.53.00.05

Epoxy Resin Board

1. Cracking caused by impact load; 2. Aging and brittleness caused by long-term exposure to sunlight and high temperature; 3. Damage caused by chemical corrosion.

1. Avoid direct impact on the pressboard; 2. Install a protective cover to avoid long-term sunlight exposure; 3. Avoid contact with strong chemical media; 4. Check the pressboard for cracks and brittleness regularly, and replace if damaged.