XQ114/6YB GCr15 Bearings Seal Maintenance

1

Linkage Part

XYQ12 Z-01.04

40CrNiMoA Alloy Steel (Quenched & Tempered)

1. Fatigue cracking from cyclic torque transmission; 2. Corrosion from drilling fluid intrusion into linkage joints

1. Inspect linkage for micro-cracks monthly via magnetic particle testing; 2. Lubricate joints with high-pressure, corrosion-resistant grease (NLGI Grade 2) every 150 operating hours

2

XYQ Series Compatible Part

XYQ, XQ140/12YA Z-31A

42CrMo Alloy Steel

1. Torsional fatigue from exceeding rated torque (12kN.m); 2. Wear from misalignment with mating components

1. Use torque monitoring systems to avoid overloading; 2. Check component alignment during installation (tolerance ±0.02mm) to prevent uneven stress

1

TQ340-35Y Core Component

TQ340-35Y

42CrMo Alloy Steel (Carburized Surface, HRC 58-62)

1. Wear from high-torque pipe make-up/break-out; 2. Stress cracking from thermal expansion in high-temperature wells

1. Operate within 35kN.m rated torque range; 2. Monitor component temperature during continuous operation (keep below 150°C per API 7K Clause 8.5)

1

General Part

B6-27

35CrMo Alloy Steel

1. Wear from relative movement in compact assembly; 2. Corrosion from limited access for maintenance (drilling fluid pooling)

1. Use needle-nose tools for precision lubrication (high-temperature grease, rated to 150°C); 2. Drill small drainage holes to prevent fluid pooling in tight spaces

2

Roller Shaft

B6-30

GCr15 Bearing Steel

1. Abrasive wear from roller rotation and drilling debris; 2. Bending fatigue from uneven load distribution

1. Install debris shields around roller assemblies; 2. Check shaft straightness monthly (tolerance ±0.01mm) to prevent bending

3

Threaded Part (M*10-14H)

B6-28

304 Stainless Steel

1. Thread galling from improper tightening (no anti-seize); 2. Corrosion from saltwater exposure in offshore operations

1. Use anti-seize compound and torque wrench (tighten to 22 N·m); 2. Rinse with fresh water after offshore use and inspect threads for corrosion

4

Inserts

B6-32

WC-Co Cemented Carbide (94% WC, 6% Co)

1. Wear from small-diameter pipe thread friction; 2. Chipping from excessive clamping force

1. Set clamping force to 80-90% of maximum rated (per tong manual); 2. Replace inserts in sets to avoid uneven wear and pipe slippage

5

General Part

B6-5

QT450-10 Ductile Iron

1. Impact damage from pipe handling in tight spaces; 2. Fatigue cracking from cyclic load

1. Use guide rails to align pipes during insertion; 2. Conduct ultrasonic testing for fatigue cracks every 6 months

6

General Part

250

35CrMo Alloy Steel

1. Torsional fatigue from torque transmission; 2. Wear from inadequate lubrication

1. Lubricate every 200 operating hours with high-pressure grease; 2. Check torque transmission efficiency monthly (target ≥95%)

7

Friction Disc

Z6-46

Fiber-Reinforced Phenolic Resin

1. Thermal degradation from excessive friction; 2. Wear from contaminated debris between disc surfaces

1. Monitor disc temperature (keep below 120°C); 2. Clean disc surfaces weekly to remove debris and ensure consistent friction

8

General Part

Z6-80

304 Stainless Steel

1. Pitting corrosion from acidic drilling fluid; 2. Wear from vibration in deviated wells

1. Test drilling fluid pH monthly (maintain 7.5-8.5); 2. Install vibration dampeners for deviated well operations

9

General Part

Z6-6

40Cr Alloy Steel

1. Shear failure from uneven load distribution; 2. Corrosion from drilling fluid intrusion

1. Ensure part is fully seated in mating component (no lateral movement); 2. Replace sealing washers during each inspection

10

General Part

QD6-10

QT500-7 Ductile Iron

1. Impact wear from sudden pipe movement; 2. Corrosion from harsh well environments

1. Operate tongs with gradual speed changes to avoid impact; 2. Apply anti-corrosion coating annually

11

General Part

Z6-28

35CrMo Alloy Steel

1. Fatigue wear from cyclic operation; 2. Wear from contact with moving components

1. Limit continuous operation to 2-hour intervals (allow cool-down); 2. Inspect contact surfaces for wear (replace if wear depth >0.3mm)

12

O-Ring (24*2.4)

B6-46

Nitrile Rubber (NBR 70 Shore)

1. Degradation from exposure to drilling fluid additives; 2. Compression set from prolonged clamping

1. Test drilling fluid additives for rubber compatibility quarterly; 2. Replace O-rings every 6 months (proactive maintenance, even if undamaged)

13

Piston

B6-73

316L Stainless Steel with PTFE Seals

1. Seal extrusion from excessive hydraulic pressure; 2. Cylinder wall scuffing due to misalignment

1. Maintain hydraulic pressure within 15-20 MPa (rated range); 2. Check piston rod alignment (tolerance ±0.02mm) during maintenance

14

Support Ring

B6-74

PTFE-Reinforced Nylon

1. Abrasive wear from metal-to-plastic contact; 2. Thermal degradation from high temperatures

1. Maintain operating temperature below 120°C; 2. Inspect for deformation (replace if out-of-round by >0.2mm)

15

General Part

B6-4

304 Stainless Steel

1. Corrosion from saltwater exposure; 2. Wear from abrasive particles in confined spaces

1. Rinse with fresh water after offshore use; 2. Install miniaturized filters in fluid lines to trap debris

16

General Part

B6-66

40Cr Alloy Steel

1. Torsional fatigue from torque transmission; 2. Wear from inadequate lubrication

1. Use molybdenum disulfide lubricant to reduce friction; 2. Conduct non-destructive testing for fatigue cracks every 3 months

17

General Part

B6-65

40Cr Alloy Steel

1. Impact damage from pipe handling; 2. Corrosion from drilling fluid splashing

1. Install rubber bumpers on tong housing; 2. Clean part surface weekly to remove drilling fluid residues

18

Spring

B6-16

60Si2Mn High-Elasticity Steel

1. Elastic fatigue from repeated compression cycles; 2. Stress corrosion cracking in high-humidity environments

1. Limit compression cycles to 10,000 per spring (replace proactively); 2. Apply anti-corrosion oil (ISO VG 32) after each washdown

19

General Part

B6-3

QT450-10 Ductile Iron

1. Wear from contact with moving components; 2. Fatigue cracking from cyclic stress

1. Apply high-temperature lubricant to contact surfaces; 2. Check for thermal stress cracks quarterly

20

Part (5*18)

B6-2

35CrMo Alloy Steel

1. Shear failure from overloading; 2. Wear from relative movement

1. Operate within rated load (5kN); 2. Ensure part is installed correctly to bear force evenly

21

General Part

B6-7

304 Stainless Steel

1. Corrosion from chemical drilling fluid additives; 2. Wear from vibration

1. Test drilling fluid additives for compatibility; 2. Install vibration dampeners

22

Screw (M10*16-8.8)

Z6-82

Alloy Steel (8.8 Grade)

1. Thread stripping from over-tightening; 2. Corrosion from harsh environments

1. Tighten to 18 N·m with a torque wrench; 2. Use zinc-plated screws for enhanced corrosion resistance

23

General Part

Z6-111

35CrMo Alloy Steel

1. Fatigue wear from cyclic operation; 2. Wear from contaminated lubricant

1. Replace lubricant every 300 operating hours; 2. Inspect part for wear monthly

24

Bearing (310)

Z6-115

GCr15 Bearing Steel (Sealed Type)

1. Dry friction from lubrication loss; 2. Damage from foreign particles entering seal

1. Use sealed bearings with lifetime lubrication (avoid re-greasing in tight spaces); 2. Inspect seal integrity monthly

25

General Part

Z6-114

304 Stainless Steel

1. Pitting corrosion from saltwater; 2. Wear from abrasive particles

1. Apply anti-corrosion coating every 6 months; 2. Install high-efficiency filters in fluid systems

26

General Part

Z6-42

40Cr Alloy Steel

1. Torsional fatigue from torque transmission; 2. Corrosion from H₂S in sour wells

1. Operate within rated torque range; 2. Use NACE MR0175-compliant materials for sour service

27

General Part

Z6-104

QT450-10 Ductile Iron

1. Impact damage from pipe handling; 2. Wear from contact with pipe surfaces

1. Use guide rails to align pipes; 2. Inspect contact surfaces for wear monthly

28

Bearing (42306)

Z6-103

GCr15 Bearing Steel (Sealed Type)

1. Fatigue wear from high-speed rotation; 2. Damage from misalignment during installation

1. Ensure accurate installation alignment (tolerance ±0.01mm); 2. Control rotation speed within rated range

1

XYQ/6YB Compatible Part

XYQ/6YB, XYQ6B Z-68

40CrNiMoA Alloy Steel

1. Torsional fatigue from cyclic torque transmission; 2. Corrosion from drilling fluid intrusion

1. Inspect for fatigue cracks monthly via magnetic particle testing; 2. Strengthen sealing to prevent fluid intrusion

2

Core Component

XYQ6B.Z-67

42CrMo Alloy Steel

1. Wear from high-torque operation; 2. Stress cracking from thermal expansion

1. Operate within rated torque range; 2. Monitor component temperature during continuous operation

3

XYQ3B Compatible Part

XYQ3B.Z-69

35CrMo Alloy Steel

1. Wear from relative movement with mating components; 2. Corrosion from harsh oilfield environments

1. Apply lubricating grease every 150 operating hours; 2. Apply anti-corrosion coating annually

4

General Part

Z-13

QT500-7 Ductile Iron

1. Impact damage from pipe handling; 2. Fatigue wear from cyclic load

1. Operate tongs smoothly without violent impact; 2. Conduct ultrasonic testing for fatigue cracks every 6 months

1

Precision Component (90*32.65*16.5mm)

01*⑴

40CrNiMoA Alloy Steel

1. Wear from contact with precision-machined surfaces; 2. Corrosion from drilling fluid contamination

1. Clean mating surfaces thoroughly before installation; 2. Use corrosion-resistant lubricant to protect precision surfaces

1

XYQ3B Power Tongs Replacement Part

XYQ3B

QT500-7 Ductile Iron

1. Impact damage from pipe handling; 2. Wear from contact with moving components

1. Install impact-absorbing pads; 2. Inspect contact surfaces monthly for wear

2

XYQ6G Power Tongs Replacement Part

XYQ6G

35CrMo Alloy Steel

1. Shear failure from over-torque; 2. Corrosion from drilling fluid

1. Use torque limiters to prevent over-torque; 2. Replace sealing components quarterly

3

XQ3F Power Tongs Replacement Part

XQ3F

304 Stainless Steel

1. Pitting corrosion from saltwater; 2. Wear from abrasive particles

1. Rinse with fresh water after offshore use; 2. Install high-efficiency filters in fluid systems

4

XQ89/3YC Power Tongs Replacement Part

XQ89/3YC

42CrMo Alloy Steel

1. Overload failure from exceeding rated torque; 2. Wear from high-speed rotation

1. Operate within 3YC-rated torque range; 2. Inspect rotational components for runout (tolerance ±0.02mm)