Crown Block & Components for SJ Petro ZJ40

1

Fixed frame

P1200099AA

Q355B carbon structural steel, welded and normalized for structural strength

1. Weld fatigue from repeated load impact; 2. Corrosion from oilfield sewage and dust.

1. Inspect weld seams quarterly for cracks per API 8C Clause 6.2; 2. Clean and apply anti-corrosion paint after each drilling cycle.

2

Fixed frame

P1000087AA

Q355B carbon structural steel, precision machined for assembly accuracy

1. Bolt loosening leading to uneven stress; 2. Abrasion from sand particles in harsh oilfield environments.

1. Retorque connecting bolts monthly; 2. Install dust covers to prevent sand intrusion into assembly gaps.

3

Crown sheave

P1000088AA

45# carbon steel, quenched and tempered, groove surface hardened to HRC 45-50

1. Groove wear from rope friction; 2. Bearing seizure causing sheave jamming and abnormal wear.

1. Lubricate bearings weekly with high-temperature grease; 2. Check rope alignment to avoid uneven groove wear.

4

Crown shaft

P1000089AA

40Cr alloy steel, heat-treated for toughness and wear resistance

1. Fatigue fracture from alternating loads; 2. Corrosion from insufficient lubrication and moisture.

1. Conduct non-destructive testing (NDT) every 6 months; 2. Ensure continuous lubrication to form oil film on shaft surface.

5

Oil cup M10X1

Z04120201005AA

Brass, precision-threaded for leak-proof lubrication

1. Thread damage from improper grease gun operation; 2. Clogging from contaminated grease.

1. Use matching grease gun nozzles to avoid thread stripping; 2. Clean oil cup before refilling with new grease.

6

Bearing 97518E

Z04120201004AA

High-carbon chromium bearing steel (GCr15), sealed for dust and moisture resistance

1. Grease degradation from high temperature and heavy load; 2. Sand intrusion causing roller wear.

1. Replace grease every 2 months or after 200 working hours; 2. Inspect sealing rings regularly for damage.

7

Stud bolt

P0300015AA

8.8-grade alloy steel, zinc-plated for corrosion resistance

1. Thread galling from over-torque; 2. Corrosion-induced thread failure in high-humidity environments.

1. Torque to specified values (per SJ Petro ZJ40 maintenance manual); 2. Apply anti-seize compound to threads before installation.

8

Shaft sleeve

P2400301AA

45# carbon steel, precision machined for interference fit

1. Wear from shaft rotation and misalignment; 2. Deformation from excessive axial load.

1. Check fit clearance during assembly (0.01-0.03mm); 2. Avoid overloading the sheave assembly beyond rated capacity.

9

Nut M20

4101800008

8.8-grade carbon steel, heat-treated for impact resistance

1. Loosening from rig vibration; 2. Thread wear from repeated disassembly.

1. Use locking washers to prevent vibration-induced loosening; 2. Replace nuts after 3 disassembly cycles.

10

Spring washer 20

4500100322

65Mn spring steel, tempered for elastic resilience

1. Fatigue failure from repeated compression; 2. Corrosion leading to loss of elastic force.

1. Replace spring washers whenever nuts are removed; 2. Store in dry environment to avoid rust.

11

Press plate

P2200492AA

Q235A carbon steel, stamped and normalized

1. Deformation from uneven bolt torque; 2. Wear from contact with rotating components.

1. Torque bolts evenly to ensure uniform pressure; 2. Inspect for deformation before each assembly.

12

Countersunk head screw M6X10

P1400283AA

4.8-grade carbon steel, zinc-plated

1. Screw head damage from improper screwdriver use; 2. Thread stripping from over-tightening.

1. Use matching Phillips screwdrivers to avoid head damage; 2. Torque to 2-3 N·m per manufacturer specs.

13

Sealing ring

4311300020

NBR rubber, resistant to oil and high temperature (up to 120°C)

1. Thermal aging from prolonged exposure to high temperatures; 2. Damage from sharp edges during installation.

1. Install with a plastic sleeve to avoid sharp edge damage; 2. Replace every 12 months or if oil leakage is detected.

14

Locking nut

4313100020

8.8-grade alloy steel, with nylon insert for self-locking

1. Nylon insert wear leading to loss of self-locking function; 2. Thread damage from over-torque.

1. Replace if nylon insert is worn or deformed; 2. Avoid using impact tools for tightening.

15

Locking washer

P6000705AA

65Mn spring steel, precision stamped

1. Elastic fatigue from repeated use; 2. Bending deformation during installation.

1. Replace after each disassembly; 2. Ensure proper alignment with locking nut notches.

16

Spacing ring

4315306010

45# carbon steel, precision ground for dimensional accuracy

1. Wear from axial movement of components; 2. Corrosion from insufficient lubrication.

1. Check dimensional accuracy annually; 2. Ensure proper lubrication between spacing ring and adjacent components.

17

Adjusting ring, bearing

Z04120100001AA

40Cr alloy steel, heat-treated for wear resistance

1. Wear from bearing rotation; 2. Deformation from improper adjustment.

1. Adjust to specified clearance (0.02-0.05mm); 2. Inspect for wear during bearing replacement.

1

Bolt M16X40

P9990081AA

8.8-grade alloy steel, zinc-plated for corrosion resistance

1. Thread galling from over-torque; 2. Fatigue failure from rig vibration.

1. Torque to 45-50 N·m; 2. Apply anti-seize compound to threads before installation.

2

Spring washer 16

Z04121300002AA

65Mn spring steel, tempered for elastic resilience

1. Fatigue failure from repeated compression; 2. Rust from oilfield moisture.

1. Replace after each disassembly; 2. Clean and dry before installation.

3

Oil cup M10X1

4311300020

Brass, precision-threaded for leak-proof lubrication

1. Clogging from contaminated grease; 2. Thread damage from improper grease gun use.

1. Clean oil cup monthly; 2. Use only compatible high-temperature grease.

4

Crown sheave

P1100641AA

45# carbon steel, quenched and tempered, groove surface hardened to HRC 45-50

1. Groove wear from rope friction; 2. Bearing seizure causing abnormal sheave rotation.

1. Inspect groove wear monthly; 2. Lubricate bearings weekly with lithium-based grease.

5

Press plate

4314504026

Q235A carbon steel, stamped and normalized

1. Deformation from uneven bolt torque; 2. Wear from contact with rotating parts.

1. Torque bolts evenly; 2. Inspect for deformation before each use.

6

Double row tapered roller bearing

P2200491AA

GCr15 bearing steel, precision ground for load-bearing capacity

1. Grease degradation from high temperature; 2. Contamination from sand and moisture.

1. Replace grease every 2 months; 2. Check seals regularly for damage.

7

Spacing sleeve

4315616040

45# carbon steel, precision machined for interference fit

1. Wear from axial movement; 2. Deformation from excessive load.

1. Check fit clearance during assembly; 2. Avoid overloading beyond rated capacity.

8

Crown shaft

4313000016

40Cr alloy steel, heat-treated for toughness and wear resistance

1. Fatigue fracture from alternating loads; 2. Corrosion from insufficient lubrication.

1. Conduct NDT every 6 months; 2. Ensure continuous lubrication to prevent rust.

9

Press plate

4101800008

Q235A carbon steel, stamped and normalized

1. Deformation from uneven pressure; 2. Abrasion from dust and debris.

1. Clean before installation; 2. Ensure proper alignment with adjacent components.

10

Retaining plate 75X20

P0300057AA

Q355B carbon steel, precision machined

1. Bolt loosening leading to plate displacement; 2. Corrosion from oilfield environment.

1. Retorque bolts monthly; 2. Apply anti-corrosion coating annually.

11

Left support

P0000208AA

Q355B carbon steel, welded and stress-relieved

1. Weld fatigue from load impact; 2. Wear from sheave rotation.

1. Inspect weld seams quarterly; 2. Check for wear on contact surfaces monthly.

12

Slotted countersunk head screw M6X20

4500300013

4.8-grade carbon steel, zinc-plated

1. Screw head damage from improper tool use; 2. Thread stripping from over-tightening.

1. Use matching slotted screwdrivers; 2. Torque to 3-4 N·m.

13

Steel wire φ2 L=500

P1100642AA

High-carbon steel, galvanized for corrosion resistance

1. Fatigue fracture from repeated bending; 2. Rust from moisture.

1. Inspect for kinks and rust monthly; 2. Replace if any damage is detected.

14

Right support

P2400300AA

Q355B carbon steel, welded and stress-relieved

1. Weld fatigue from load impact; 2. Corrosion from oilfield sewage.

1. Inspect weld seams quarterly; 2. Clean and apply anti-corrosion paint regularly.

15

Nut M20

P0100218AA

8.8-grade alloy steel, heat-treated for impact resistance

1. Loosening from rig vibration; 2. Thread wear from repeated disassembly.

1. Use locking washers; 2. Replace after 3 disassembly cycles.

16

Supporting sleeve L519

P6004250AA

45# carbon steel, precision machined for dimensional accuracy

1. Wear from shaft rotation; 2. Deformation from axial load.

1. Check dimensional accuracy annually; 2. Ensure proper lubrication between sleeve and shaft.

17

Cotter pin ￠4x25

Z04121300001AA

Q235A carbon steel, zinc-plated

1. Bending fatigue from vibration; 2. Rust leading to breakage.

1. Inspect monthly for bending or rust; 2. Replace if any damage is found.

18

Stud bolt

4315306020

8.8-grade alloy steel, zinc-plated for corrosion resistance

1. Thread galling from over-torque; 2. Corrosion-induced thread failure.

1. Torque to specified values; 2. Apply anti-seize compound to threads.

1

Bolt M12X25

P9990077AA

8.8-grade alloy steel, zinc-plated for corrosion resistance

1. Thread wear from repeated disassembly; 2. Fatigue failure from rig vibration.

1. Torque to 25-30 N·m; 2. Replace after 3 disassembly cycles.

2

Spring washer 12

4311300020

65Mn spring steel, tempered for elastic resilience

1. Fatigue failure from repeated compression; 2. Rust from moisture.

1. Replace after each disassembly; 2. Store in dry environment.

3

Oil cup M10X1

P1100640AA

Brass, precision-threaded for leak-proof lubrication

1. Clogging from contaminated grease; 2. Thread damage from improper use.

1. Clean monthly; 2. Use compatible grease for high-pressure conditions.

4

Fastline sheave

4314504026

45# carbon steel, quenched and tempered, groove surface hardened to HRC 45-50

1. Groove wear from heavy rope load; 2. Bearing seizure causing abnormal rotation.

1. Inspect groove wear weekly; 2. Lubricate bearings with high-load grease.

5

Press plate

4315612025

Q235A carbon steel, stamped and normalized

1. Deformation from uneven bolt torque; 2. Wear from contact with rotating parts.

1. Torque bolts evenly; 2. Inspect for deformation before use.

6

Double row tapered roller bearing

4313100012

GCr15 bearing steel, precision ground for heavy-load capacity

1. Grease degradation from high temperature; 2. Contamination from sand and debris.

1. Replace grease every 2 months; 2. Check seals for damage regularly.

7

Spacing sleeve

4101800008

45# carbon steel, precision machined for interference fit

1. Wear from axial movement; 2. Deformation from excessive load.

1. Check fit clearance during assembly; 2. Avoid overloading beyond rated capacity.

8

Crown block shaft

P0300056AA

40Cr alloy steel, heat-treated for toughness and wear resistance

1. Fatigue fracture from alternating loads; 2. Corrosion from insufficient lubrication.

1. Conduct NDT every 6 months; 2. Ensure continuous lubrication.

9

Press plate

P0000208AA

Q235A carbon steel, stamped and normalized

1. Deformation from uneven pressure; 2. Abrasion from dust.

1. Clean before installation; 2. Ensure proper alignment.

10

Retaining plate 75X20

4500300013

Q355B carbon steel, precision machined

1. Bolt loosening leading to displacement; 2. Corrosion from oilfield environment.

1. Retorque bolts monthly; 2. Apply anti-corrosion coating annually.

11

Press plate

P1000375AA

Q235A carbon steel, stamped and normalized

1. Deformation from heavy load; 2. Wear from repeated use.

1. Inspect for deformation monthly; 2. Replace if damaged.

12

Right support

P2400299AA

Q355B carbon steel, welded and stress-relieved

1. Weld fatigue from load impact; 2. Wear from sheave rotation.

1. Inspect weld seams quarterly; 2. Check contact surfaces for wear.

13

Slotted countersunk head screw M6X20

P0100263AA

4.8-grade carbon steel, zinc-plated

1. Screw head damage from improper tool use; 2. Thread stripping from over-tightening.

1. Use matching slotted screwdrivers; 2. Torque to 3-4 N·m.

14

Steel wire φ2 L=500

P6004250AA

High-carbon steel, galvanized for corrosion resistance

1. Fatigue fracture from repeated bending; 2. Rust from moisture.

1. Inspect monthly for damage; 2. Replace if kinks or rust are present.

15

Nut M20

P0100264AA

8.8-grade alloy steel, heat-treated for impact resistance

1. Loosening from rig vibration; 2. Thread wear from repeated disassembly.

1. Use locking washers; 2. Replace after 3 disassembly cycles.

16

Supporting sleeve L107

Z04121300003AA

45# carbon steel, precision machined for dimensional accuracy

1. Wear from shaft rotation; 2. Deformation from axial load.

1. Check dimensional accuracy annually; 2. Ensure proper lubrication.

17

Cotter pin ￠4X26

4315306020

Q235A carbon steel, zinc-plated

1. Bending fatigue from vibration; 2. Rust leading to breakage.

1. Inspect monthly; 2. Replace if any damage is detected.

18

Stud bolt

P2400299AA

8.8-grade alloy steel, zinc-plated for corrosion resistance

1. Thread galling from over-torque; 2. Corrosion-induced thread failure.

1. Torque to specified values; 2. Apply anti-seize compound to threads.

19

Left support

P0000208AA

Q355B carbon steel, welded and stress-relieved

1. Weld fatigue from load impact; 2. Corrosion from oilfield sewage.

1. Inspect weld seams quarterly; 2. Clean and apply anti-corrosion paint regularly.

1

Bolt M22x65

4303322065

8.8-grade alloy steel, zinc-plated for corrosion resistance

1. Thread galling from over-torque; 2. Fatigue failure from rig vibration; 3. Corrosion from oilfield moisture.

1. Torque to 80-85 N·m per ISO 898-1; 2. Apply anti-seize compound to threads; 3. Retorque monthly.

2

Nut M22

4315100022

8.8-grade alloy steel, heat-treated for impact resistance

1. Loosening from vibration; 2. Thread wear from repeated disassembly; 3. Deformation from over-torque.

1. Use spring washers for anti-loosening; 2. Replace after 3 disassembly cycles; 3. Avoid impact tool use.

3

Spring washer 22

4313100022

65Mn spring steel, tempered for elastic resilience

1. Fatigue failure from repeated compression; 2. Rust from moisture; 3. Deformation from over-tightening.

1. Replace after each disassembly; 2. Store in dry, sealed containers; 3. Avoid over-compression during installation.

4

Bolt M24x70

4303324070

8.8-grade alloy steel, zinc-plated for corrosion resistance

1. Thread galling from over-torque; 2. Fatigue fracture from alternating loads; 3. Corrosion from oilfield sewage.

1. Torque to 100-105 N·m; 2. Conduct visual inspections monthly; 3. Apply anti-corrosion coating annually.

5

Nut M24

4315100024

8.8-grade alloy steel, heat-treated for impact resistance

1. Loosening from rig vibration; 2. Thread wear from repeated use; 3. Corrosion-induced failure.

1. Use locking nuts for critical applications; 2. Replace if threads are worn; 3. Clean threads before installation.

6

Spring washer 24

4313100024

65Mn spring steel, tempered for elastic resilience

1. Fatigue failure from repeated compression; 2. Rust from high humidity; 3. Bending deformation.

1. Replace after each disassembly; 2. Inspect for elasticity before installation; 3. Avoid reuse of deformed washers.

7

Cotter pin 5X45

4314504045

Q235A carbon steel, zinc-plated for corrosion resistance

1. Bending fatigue from vibration; 2. Rust leading to breakage; 3. Damage from improper installation.

1. Inspect monthly for bending or rust; 2. Replace if any damage is detected; 3. Ensure proper spreading of pin ends after installation.

Are these components compatible with other ZJ-series drilling rigs?

No, all components are exclusively designed for SJ Petro ZJ40 Truck-Mounted Drilling Rigs. Dimensional and load-bearing specifications are tailored to ZJ40’s crown block design, ensuring compliance with SJ Petro’s original equipment standards and API 8C.

What is the recommended maintenance cycle for ZJ40 crown block components?

Follow a dual-cycle maintenance plan: Weekly checks (lubrication, visual wear inspection); Monthly inspections (bolt torque, seal integrity); Semi-annual NDT for load-bearing components (shafts, sheaves); Annual replacement of seals and wear parts (spring washers, cotter pins).

Do these components meet industry safety standards?

Yes, all components comply with API 8C (Hoisting Equipment for Drilling and Production Platforms) and ISO 898-1 (Mechanical Properties of Fasteners), passing strict quality control tests to ensure load-bearing capacity and durability for oilfield safety requirements.