ZJ40 Drilling Rig Telescoping Cylinder Centralizer Parts

1

Centralizer, telescoping cylinder

Z04170000038AA

Alloy Steel (Q355B) with Anti-Corrosion Coating & Precision Machining

1. Wear from contact with cylinder surfaces; 2. Corrosion by drilling fluid and outdoor exposure; 3. Deformation from lateral pressure.

1. Inspect centralizing accuracy monthly per API Spec 7K; 2. Clean surface and reapply anti-corrosion grease biweekly; 3. Avoid forced contact with deformed cylinder sections.

2

Side folding arm I

Z04170100062AA

Alloy Steel (40Cr) with Quenching & Tempering Treatment

1. Fatigue wear at hinge points; 2. Bending deformation from uneven force; 3. Corrosion-induced structural weakening.

1. Lubricate hinge points monthly with lithium-based grease; 2. Inspect for bending during daily checks; 3. Conduct magnetic particle inspection quarterly for cracks.

3

Bottom folding arm

Z04170100063AA

Alloy Steel (40Cr) with Quenching & Tempering Treatment

1. Fatigue wear at hinge points; 2. Bending deformation from uneven force; 3. Corrosion-induced structural weakening.

1. Lubricate hinge points monthly with lithium-based grease; 2. Inspect for bending during daily checks; 3. Conduct magnetic particle inspection quarterly for cracks.

4

Side folding arm II

Z04170100061AA

Alloy Steel (40Cr) with Quenching & Tempering Treatment

1. Fatigue wear at hinge points; 2. Bending deformation from uneven force; 3. Corrosion-induced structural weakening.

1. Lubricate hinge points monthly with lithium-based grease; 2. Inspect for bending during daily checks; 3. Conduct magnetic particle inspection quarterly for cracks.

5

Rectangular tube

P9840512AA

Carbon Steel (Q235B) with Seamless Welding

1. Welding joint fatigue under repeated load; 2. Corrosion by drilling fluid; 3. Deformation from impact or pressure.

1. Inspect welding joints monthly for cracks; 2. Apply anti-corrosion paint annually; 3. Avoid dropping heavy objects on the tube.

6

Stiffener 80X80

P6004338AA

Alloy Steel (Q355B) with Reinforced Structure

1. Wear from structural friction; 2. Welding joint detachment; 3. Corrosion-induced weakening.

1. Inspect welding connections weekly; 2. Apply anti-rust grease to contact points; 3. Replace if bending or cracks are found.

1

Tension spring

P9000099AA

High-Carbon Spring Steel (65Mn) with Heat Treatment

1. Fatigue fracture from repeated expansion/contraction; 2. Rust and corrosion; 3. Deformation from over-tensioning.

1. Inspect for cracks or deformation weekly; 2. Apply anti-rust oil monthly; 3. Avoid over-stretching beyond rated capacity.

2

Bolt, tension spring

P2200302AA

Carbon Steel (45#) with Heat Treatment

1. Thread wear from spring vibration; 2. Fatigue fracture from tension; 3. Corrosion by drilling fluid.

1. Tighten to 30-35 N·m torque; 2. Apply anti-seize agent to threads; 3. Replace together with worn springs.

3

Left tension spring seat L120

P9810176AA

Alloy Steel (Q235B) with Precision Machining

1. Wear from spring friction; 2. Deformation from repeated tension; 3. Corrosion in humid environments.

1. Apply molybdenum disulfide lubricant to contact points; 2. Inspect for deformation monthly; 3. Replace if seat grooves are worn.

4

Bottom tension spring seat

P9810177AA

Alloy Steel (Q235B) with Precision Machining

1. Wear from spring friction; 2. Deformation from repeated tension; 3. Corrosion in humid environments.

1. Apply molybdenum disulfide lubricant to contact points; 2. Inspect for deformation monthly; 3. Replace if seat grooves are worn.

5

Right tension spring seat L120

P9810178AA

Alloy Steel (Q235B) with Precision Machining

1. Wear from spring friction; 2. Deformation from repeated tension; 3. Corrosion in humid environments.

1. Apply molybdenum disulfide lubricant to contact points; 2. Inspect for deformation monthly; 3. Replace if seat grooves are worn.

1

Pin seat

P7100452AA

Carbon Steel (Q235A) with Surface Hardening

1. Wear from pin movement; 2. Corrosion by drilling fluid; 3. Loosening of connecting fasteners.

1. Tighten connecting bolts weekly; 2. Apply anti-rust grease to pin holes; 3. Replace if seat holes are worn.

2

Pad eye seat

P6004336AA

Alloy Steel (Q235B) with Welded Base

1. Welding joint fatigue; 2. Wear from pad eye movement; 3. Corrosion by outdoor exposure.

1. Inspect welding joints monthly for cracks; 2. Apply anti-corrosion paint to welds; 3. Avoid overloading the pad eye.

3

Pad eye

P6004337AA

Alloy Steel (35CrMoA) with Load-Bearing Reinforcement

1. Fatigue wear from lifting or pulling loads; 2. Corrosion by drilling fluid; 3. Deformation from overloading.

1. Inspect load-bearing capacity quarterly; 2. Apply anti-rust grease after use; 3. Never exceed rated load.

4

Pin shaft

P2400308AA

Alloy Steel (40Cr) with Quenching Treatment

1. Wear from rotational friction; 2. Corrosion by drilling fluid; 3. Bending from lateral force.

1. Apply lithium-based grease monthly; 2. Inspect for bending weekly; 3. Conduct magnetic particle inspection quarterly.

5

Retaining plate

P6009337AA

Carbon Steel (Q235A)

1. Wear from component friction; 2. Deformation from excessive pressure; 3. Corrosion in humid environments.

1. Inspect flatness before installation; 2. Apply lubricant at friction points; 3. Apply anti-rust paint regularly.

1

Oil cup M10X1

4101800008

Brass

1. Blockage by lubricant impurities; 2. Thread wear from frequent oil injection; 3. Corrosion by chemical agents.

1. Filter lubricant before injection; 2. Avoid over-tightening during installation; 3. Clean monthly to prevent blockage.

2

Nut M12

4309300012

Carbon Steel (45#) with Heat Treatment

1. Thread stripping from vibration; 2. Corrosion-induced seizing; 3. Wear from repeated disassembly.

1. Apply anti-seize agent to threads; 2. Use lock washers to prevent loosening; 3. Replace if thread damage is found.

3

Cotter pin 3.2X30

4314532030

Carbon Steel (Q235A)

1. Fatigue breakage from vibration; 2. Rust and corrosion; 3. Bending from improper insertion.

1. Replace every 3 months; 2. Apply anti-rust oil regularly; 3. Ensure full insertion and proper bending to secure nuts.

4

Washer 20

4317100020

Carbon Steel (Q235A) with Zinc Plating

1. Elastic fatigue from vibration; 2. Zinc layer wear leading to corrosion; 3. Deformation from over-tightening.

1. Replace with nuts/bolts as a set; 2. Avoid over-tightening (follow standard torque); 3. Touch up anti-corrosion coating if needed.

1

What standards do these telescoping cylinder centralizer parts comply with?

All parts meet API Spec 7K (Drilling and Production Hoisting Equipment) and GB/T 1222-2016 (Spring Steels) standards, ensuring compatibility with ZJ40 drilling rigs and adherence to industrial safety and durability requirements.

2

How to judge if a tension spring needs replacement?

Replace the tension spring if cracks, permanent deformation, or loss of elasticity are found. Also, replace it if the spring’s expansion/contraction cycle exceeds 10,000 times, as fatigue damage may occur even without visible defects.

3

What lubricants are suitable for different components of this system?

Use lithium-based grease for pin shafts and hinge points (resists high pressure and vibration); molybdenum disulfide for tension spring seats (reduces friction); and standard industrial anti-rust oil for fasteners and structural parts to prevent corrosion.