XQ140/12YA Pistons Hydraulic Stability Guide

1

Piston

XQY12A

40CrNiMoA Alloy Steel (Quenched & Tempered + Hard Chrome Plating)

1. Abrasive wear from contaminated hydraulic oil; 2. Seal damage from high-pressure cyclic operation

1. Replace hydraulic oil every 500 operating hours and install high-efficiency filters; 2. Inspect piston surface for scratches monthly (polish if minor, replace if severe)

2

Piston (Backup)

XQY12A

40CrNiMoA Alloy Steel (Quenched & Tempered + Hard Chrome Plating)

1. Storage corrosion from improper environmental conditions; 2. Surface damage from mishandling during storage

1. Store in sealed anti-corrosion packaging in a dry, temperature-controlled (15-25°C) warehouse; 2. Inspect surface integrity before installation

3

General Component

XQY12A

40CrNiMoA Alloy Steel

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

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

4

Located Screw (Backup)

XQY12A

Alloy Steel (8.8 Grade)

1. Thread corrosion from storage in high-humidity environments; 2. Thread damage from improper storage stacking

1. Apply anti-seize compound to threads before storage; 2. Store in vertical racks to avoid thread compression

5

General Component (Backup)

XQY12A

40CrNiMoA Alloy Steel

1. Oxidation from long-term exposure to air; 2. Surface scratches from improper handling

1. Apply anti-oxidation oil before storage; 2. Use soft-padding during transportation and storage

6

Pin (Backup)

XQY12A

35CrMo Alloy Steel (Carburized Surface)

1. Corrosion from moisture during storage; 2. Bending from improper stacking pressure

1. Store in sealed plastic bags with desiccants; 2. Stack horizontally on flat surfaces with uniform support

7

Inserts Assembly (Backup)

XQY12A

WC-Co Cemented Carbide + Steel Base

1. Chipping from mishandling during storage; 2. Corrosion of steel base from humidity

1. Package in foam-lined containers; 2. Apply anti-corrosion coating to steel base before storage

8

Rear Guide Rod Assembly

XQY12A

40Cr Alloy Steel + Nitrile Rubber Seals

1. Wear from relative movement with cylinder walls; 2. Seal damage from contaminated hydraulic oil

1. Ensure cylinder walls are clean before assembly; 2. Replace seals every 800 operating hours proactively

9

Front Guide Rod Assembly

XQY12A

40Cr Alloy Steel + Nitrile Rubber Seals

1. Bending fatigue from uneven load distribution; 2. Corrosion from drilling fluid splashing

1. Align guide rod with piston strictly per assembly manual; 2. Install protective covers to prevent fluid splashing

10

General Component

XYQ12 Z-01.05

35CrMo Alloy Steel

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

1. Apply molybdenum disulfide lubricant to contact surfaces; 2. Conduct non-destructive testing every 3 months

11

General Component

12AZ-61

QT500-10 Ductile Iron

1. Impact damage from sudden pipe movement; 2. Corrosion from drilling fluid

1. Install rubber bumpers on component surfaces; 2. Clean and dry weekly to remove fluid residues

12

Valve Body

12AZ-236

40Cr Alloy Steel (Quenched & Tempered)

1. Internal wear from valve core movement; 2. Corrosion from hydraulic oil contamination

1. Maintain hydraulic oil cleanliness (NAS 8 class or higher); 2. Inspect internal channels for wear annually via endoscope

13

Valve Core

12AZ-248

GCr15 Bearing Steel (Hardened HRC 60-62)

1. Abrasive wear from contaminated oil; 2. Deformation from high-temperature operation

1. Replace hydraulic oil and filters regularly; 2. Monitor system temperature (limit to 100°C)

14

General Component

XYQ12AB-31

304 Stainless Steel

1. Pitting corrosion from saltwater in offshore operations; 2. Wear from abrasive particles

1. Rinse with fresh water after offshore use; 2. Install particle filters in fluid lines

15

Housing Component (1024*582*539)

XQ1*⑴

Q355B Carbon Steel (Welded & Stress-Relieved)

1. Weld fatigue from vibration; 2. Corrosion from atmospheric moisture and fluid splashing

1. Inspect weld seams monthly for cracks; 2. Apply anti-corrosion paint (epoxy primer + polyurethane topcoat) annually

1

General Component

XYQ3B.Z.1-7 Z6-49

35CrMo Alloy Steel

1. Wear from relative movement in compact assembly; 2. Corrosion from drilling fluid pooling in tight spaces

1. Use precision lubrication tools for confined spaces; 2. Drill small drainage holes to prevent fluid accumulation

2

General Component

B6-41

QT450-10 Ductile Iron

1. Impact damage from installation in tight spaces; 2. Fatigue cracking from cyclic stress

1. Use specialized installation tools to avoid forced assembly; 2. Conduct ultrasonic testing every 6 months

3

General Component

B6-62

304 Stainless Steel

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

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

4

Joints

B6-45

40CrNiMoA Alloy Steel

1. Thread wear from repeated assembly/disassembly; 2. Torsional fatigue from torque transmission

1. Use anti-seize compound during assembly; 2. Inspect thread integrity monthly

5

Adaptor (10Ⅱ-600)

B6-43

42CrMo Alloy Steel

1. Wear from contact with mating components; 2. Corrosion from H₂S in sour wells

1. Ensure proper alignment during assembly; 2. Use NACE MR0175-compliant coating for sour service

6

General Component

B6-18

35CrMo Alloy Steel

1. Shear failure from uneven load distribution; 2. Wear from contaminated lubricant

1. Ensure even load bearing during installation; 2. Replace lubricant every 300 operating hours

7

General Component

B6-13

QT450-10 Ductile Iron

1. Thermal stress cracking from high-temperature wells; 2. Wear from fluid splashing

1. Maintain operating temperature below 120°C; 2. Clean surface weekly

8

General Component

B6-38

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

9

Threaded Component (A40*1.5)

B6-72

40Cr Alloy Steel

1. Thread galling from improper tightening; 2. Corrosion from drilling fluid

1. Tighten with torque wrench per specification; 2. Strengthen sealing to prevent fluid intrusion

10

Liner

B6-37

Copper Alloy (H62)

1. Wear from contact with moving components; 2. Deformation from high pressure

1. Inspect liner thickness monthly (replace if wear exceeds 0.3mm); 2. Ensure proper preload during installation

11

Bolt (M16*55-8.8)

B6-34

Alloy Steel (8.8 Grade)

1. Thread stripping from over-tightening; 2. Fatigue failure from cyclic vibration

1. Tighten to 80 N·m with torque wrench; 2. Use lock washers to prevent loosening

1

Cylinder

02-00M

27SiMn Alloy Steel (Seamless Pipe + Hard Chrome Plating)

1. Internal wear from piston movement; 2. Corrosion from hydraulic oil contamination

1. Maintain hydraulic oil cleanliness (NAS 7 class or higher); 2. Inspect internal surface for scratches annually

2

Piston Rod

02-08M

40Cr Alloy Steel (Quenched & Tempered + Hard Chrome Plating)

1. Bending fatigue from uneven load; 2. Seal damage from external debris

1. Align piston rod with cylinder strictly; 2. Install rod scrapers to remove debris

3

Inserts

0101-27M

WC-Co Cemented Carbide + Steel Base

1. Wear from contact with pipe surfaces; 2. Chipping from sudden impact

1. Inspect insert surface monthly (replace if wear depth >0.5mm); 2. Ensure pipe surfaces are clean before clamping

4

General Component

0101-24M

35CrMo Alloy Steel

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

1. Inspect for fatigue cracks monthly; 2. Lubricate with anti-corrosion grease every 150 operating hours

5

General Component

QF501B

QT500-10 Ductile Iron

1. Impact damage from pipe handling; 2. Wear from fluid splashing

1. Install protective guards; 2. Clean surface weekly to remove fluid residues

6

Valve

34SH-B20H-T

40Cr Alloy Steel + Nitrile Rubber Seals

1. Seal damage from contaminated oil; 2. Valve core wear from long-term operation

1. Replace hydraulic oil every 500 operating hours; 2. Calibrate valve quarterly for pressure accuracy

7

Screw

0101-28M

Alloy Steel (8.8 Grade)

1. Thread galling from improper assembly; 2. Corrosion from humidity

1. Use anti-seize compound during assembly; 2. Inspect threads monthly for corrosion

8

Brake Strap

010601-00M

Fiber-Reinforced Phenolic Resin + Steel Core

1. Thermal degradation from frequent braking; 2. Wear from contaminated brake discs

1. Avoid continuous heavy braking; 2. Clean brake discs weekly to remove debris

1

O Ring (22*2.4)

GB1235-76

Nitrile Rubber (NBR 70 Shore A)

1. Elastic fatigue from repeated compression cycles; 2. Swelling and degradation from hydraulic oil contamination

1. Replace O-rings every 600 operating hours proactively; 2. Ensure hydraulic oil is compatible with NBR and maintain cleanliness

1

Bolt (M10*20)

GB70-85

Alloy Steel (8.8 Grade)

1. Thread stripping from over-tightening; 2. Fatigue failure from cyclic vibration

1. Tighten to 30 N·m with torque wrench; 2. Use spring washers and check tightness monthly

1

General Component

6B.Z-15

40Cr Alloy Steel

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

1. Inspect for fatigue cracks monthly; 2. Apply anti-corrosion coating annually

2

General Component

6B.Z-22

QT500-10 Ductile Iron

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

1. Install rubber bumpers; 2. Lubricate contact surfaces every 200 operating hours

3

General Component

6B.Z-18

304 Stainless Steel

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

1. Rinse with fresh water after offshore use; 2. Install particle filters in fluid lines

1

TQ340-35Y Replacement Part

TQ340-35Y

42CrMo Alloy Steel / 304 Stainless Steel

1. Wear from high-torque operation; 2. Corrosion from H₂S in sour wells

1. Operate within rated torque range; 2. Use NACE MR0175-compliant materials and coatings

2

XQ89/3YC Replacement Part

XQ893YC (XQ89/3YC)

40CrNiMoA Alloy Steel

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

1. Install torque limiters; 2. Inspect rotational components for runout (±0.02mm tolerance) monthly