BOMCO F-1300/1600 Crosshead Assembly-3

1

Crosshead

AH1301020401

Alloy steel (40CrNiMoA, quenched and tempered)

1. High-frequency impact load during drilling; 2. Poor lubrication leading to metal-to-metal friction

1. Maintain lubricant cleanliness and level per API 7K standards; 2. Inspect for surface cracks quarterly via magnetic particle testing.

2

Crosshead Extension

AH1301010409

Carbon steel (Q355B) with anti-corrosion coating

1. Torsional stress from misalignment; 2. Corrosion by drilling fluid splashes

1. Align with crosshead and connecting rod during installation; 2. Clean and touch up anti-corrosion coating monthly.

3

Crosshead Pin

AH1301020403

Chrome-molybdenum steel (42CrMo)

1. Fatigue wear from repeated load cycles; 2. Misalignment causing uneven stress distribution

1. Check pin concentricity annually; 2. Replace if radial runout exceeds 0.02mm.

4

Crosshead Pin Retainer

AH1301020404

Carbon steel (Q235A)

1. Loosening due to pump vibration; 2. Fatigue fracture from repeated torque

1. Tighten to specified torque (350-400 N·m); 2. Use thread locker (consistent with 243 grade) for secure fastening.

5

Crosshead Bearing

AH1301010414

Chrome steel (GCr15) with precision grinding

1. Contamination by mud or debris; 2. Lubricant degradation at high temperatures

1. Install with clean tools to avoid debris; 2. Replace lubricant every 250 operating hours.

1

Crosshead Guide (Upper)

AH1301010402

Gray cast iron (HT250) with wear-resistant lining

1. Abrasion from crosshead sliding; 2. Misalignment leading to edge wear

1. Adjust clearance to 0.15-0.25mm using shims; 2. Inspect lining wear monthly and replace if worn over 0.5mm.

2

Crosshead Guide (Lower)

AH1301010412

Gray cast iron (HT250) with wear-resistant lining

1. Uneven load distribution; 2. Contamination by drilling mud

1. Clean guide rails regularly to remove debris; 2. Ensure uniform load during pump operation.

3

Shim set

AH100101041700

Spring steel (65Mn) with anti-rust plating

1. Fatigue deformation from repeated compression; 2. Corrosion in humid environments

1. Avoid over-tightening to prevent shim deformation; 2. Store unused shims in dry, sealed containers.

4

Adjusting Shim

AH1301010403

Spring steel (65Mn) with precision thickness control

1. Thickness wear from long-term load; 2. Misalignment causing uneven stress

1. Select appropriate thickness for precise clearance adjustment; 2. Replace if thickness deviation exceeds 0.01mm.

1

Diaphragm Stuffing Box

AH1301010404

Carbon steel (Q235B) with nitrided surface

1. Corrosion by drilling fluid; 2. Seal wear leading to fluid ingress

1. Inspect for fluid leakage weekly; 2. Replace sealing components at first sign of leakage.

2

Sealing Ring

AH1301010405

Fluororubber (FKM) for high temperature resistance

1. High-temperature aging (exceeding 120℃); 2. Chemical corrosion by drilling fluid additives

1. Ensure operating temperature stays within 20-120℃; 2. Avoid contact with strong oxidizing drilling fluids.

3

O-ring φ190×3.55 (GB3452.1)

530301011900035507

Nitrile rubber (NBR) with good oil resistance

1. Compression set from long-term installation; 2. Lubricant incompatibility

1. Use compatible lubricants (avoid mineral oil with high aromatic content); 2. Replace O-rings every 6 months.

4

O-ring φ125×7 (GB3452.1)

530301011250070007

Nitrile rubber (NBR) with good oil resistance

1. Surface scratches during installation; 2. Pressure overload leading to extrusion damage

1. Use installation tools to avoid scratching; 2. Ensure operating pressure is within 15MPa.

5

O-ring φ160×7 (GB3452.1)

530301011600070007

Nitrile rubber (NBR) with good oil resistance

1. Aging from long-term exposure to air; 2. Temperature fluctuations

1. Store O-rings in sealed, cool environments; 2. Inspect for hardening or cracking before installation.

6

Double Lip Oil Seal 5"X6.25"X0.625"

AH1301010406

Fluororubber (FKM) with stainless steel spring

1. Shaft surface scratches; 2. Debris ingress damaging lip seal

1. Inspect shaft surface for scratches before installation; 2. Install dust covers to prevent debris entry.

7

Lock Spring

AH1301010407

Spring steel (65Mn)

1. Fatigue failure from repeated compression; 2. Corrosion leading to brittle fracture

1. Check spring elasticity quarterly; 2. Replace if deformation or rust is found.

8

Fluid Baffle Disc

AH1301010408

Stainless steel (304)

1. Corrosion by acidic lubricants; 2. Impact from fluid turbulence

1. Use neutral lubricants to avoid corrosion; 2. Inspect for warping annually.

9

Gasket

AH1301010411

Asbestos-free fiber composite

1. High-temperature aging; 2. Over-tightening leading to material failure

1. Torque bolts per GB/T 1231 standards; 2. Replace gasket during routine maintenance.

1

Bolt 3/4-10UNCX2 1/2

T500-3010

High-strength alloy steel (10.9 grade)

1. Fatigue fracture from pump vibration; 2. Thread corrosion

1. Use lock washers and thread locker; 2. Re-tighten after 100 operating hours.

2

Bolt 1-8UNCX2 1/4

T500-2018K

High-strength alloy steel (12.9 grade)

1. Over-tightening leading to thread damage; 2. Impact load during startup

1. Torque to 650-700 N·m; 2. Inspect thread integrity before installation.

3

Bolt 1-8UNCX2 1/2

T500-2019K

High-strength alloy steel (12.9 grade)

1. Uneven torque distribution; 2. Corrosion in marine drilling environments

1. Tighten bolts symmetrically; 2. Apply anti-corrosion grease for marine use.

4

Bolt 3/8-16UNCX1

T500-1021

High-strength alloy steel (8.8 grade)

1. Loosening from high vibration; 2. Thread wear from frequent disassembly

1. Use nylon insert lock nuts; 2. Avoid unnecessary disassembly.

5

Capscrew 1-8UNCX2 1/2

T500-3013K

High-strength alloy steel (12.9 grade)

1. Torsional stress during installation; 2. Fatigue from repeated load

1. Use torque wrench for precise installation; 2. Replace after 2 service cycles.

6

Washer 10 (GB93)

420503011101600000

Spring steel (65Mn) with zinc plating

1. Compression fatigue; 2. Zinc plating wear leading to corrosion

1. Replace if washer loses elasticity; 2. Ensure washer size matches bolt diameter.

7

Locking Plate

AH1301020402

Carbon steel (Q235A) with anti-rust coating

1. Bending from improper installation; 2. Corrosion leading to breakage

1. Install flat against component surface; 2. Inspect for cracks during maintenance.

8

Pipe connector NPT3/8″×2

AH1301010414

Brass (H62)

1. Thread damage during installation; 2. Corrosion by saltwater

1. Use pipe thread sealant during installation; 2. Avoid over-tightening to prevent thread stripping.

9

Wire φ1.6 (GB4240)

040104030160000800

Stainless steel (304)

1. Fatigue fracture from vibration; 2. Bending damage during use

1. Avoid excessive bending; 2. Cut to appropriate length to prevent slack.

10

Glue for Screw Lock 243

170506010100243000

Anaerobic adhesive (243 grade)

1. Degradation from high temperature; 2. Contamination before application

1. Apply to clean, dry threads; 2. Allow 24 hours for full curing before operation.

Are these components compatible with both F-1300 and F-1600 models?

Yes, all listed parts are compatible with both BOMCO F-1300 and F-1600 mud pumps, as they follow the same crosshead assembly design specifications and part number standards.

What is the recommended service cycle for crosshead assembly components?

For standard drilling, inspect sealing parts monthly, replace wear-resistant components (guides, bearings) every 6 months, and conduct full assembly inspection annually to comply with API 7K maintenance requirements.

How to ensure proper installation of crosshead pins and bearings?

Install per BOMCO maintenance manual: ensure crosshead pin concentricity, apply appropriate lubricant (ISO VG 46), torque fasteners to specified values, and verify clearance with shims to prevent jamming or uneven wear.