CPTDC Travelling Block (YG40-YG350) Parts

1

Sheave

YG000001

Hard chrome-plated alloy steel (42CrMo), API 8C

1. Abrasion from drilling rope friction; 2. Groove deformation from uneven load.

1. Align rope with sheave grooves; 2. Inspect groove depth monthly, grind if worn over 2mm.

2

Sheave Shaft

YG000024

High-strength carbon steel (45#), quenched and tempered

1. Bending fatigue from radial load; 2. Corrosion from wellsite moisture.

1. Avoid overloading beyond rated capacity; 2. Apply anti-rust lubricant every 300 operating hours.

3

Bearing Sheave

YG000022

Precision rolling bearing (SKF equivalent), IP54 protection

1. Seizure from insufficient lubrication; 2. Damage from foreign particles.

1. Use API 5GL synthetic lubricant; 2. Clean bearing housing before refueling, replace oil seals if damaged.

4

Flat Thrust Bearing

YG000017

Chrome steel (GCr15), API 7K

1. Wear from axial load impact; 2. Pitting from contaminated lubricant.

1. Limit sudden hoisting/lowering speeds; 2. Filter lubricant every 500 hours to remove impurities.

1

Lock mechanism for hook body

YG000018

Alloy steel (20CrMnTi), carburized quenching

1. Wear from repeated locking/unlocking; 2. Jam from sand/mud accumulation.

1. Inspect locking clearance weekly (0.1~0.3mm); 2. Clean mechanism with diesel, apply anti-seize paste.

2

Locking arm

YG000013

Forged alloy steel (40Cr), heat-treated

1. Fatigue fracture at stress points; 2. Deformation from overload impact.

1. Never exceed rated load; 2. Check for cracks with magnetic particle inspection quarterly.

3

Lock mechanism of locking arm

YG000019

Stainless steel (304) and alloy steel composite

1. Spring fatigue; 2. Corrosion from wellsite chemicals.

1. Test locking flexibility daily; 2. Replace spring (YG000023) annually or if elasticity decreases.

4

Pin shaft of locking arm

YG000021

Alloy steel pin (42CrMo), zinc-plated

1. Wear from rotational friction; 2. Shear failure from misalignment.

1. Lubricate pin shaft weekly; 2. Check alignment of locking arm, adjust if misaligned.

1

Oil seal

YG000016

Nitrile rubber (NBR), high-temperature resistant (120℃)

1. Wear from shaft rotation; 2. Hardening/brittleness from high temperature.

1. Replace oil seals every 800 operating hours; 2. Ensure shaft surface is smooth, no burrs.

2

Gland

YG000010

Carbon steel (Q235B), anti-corrosion coated

1. Deformation from over-tightening; 2. Corrosion from wet environments.

1. Torque bolts to 45~55N·m (per API RP 7G); 2. Touch up anti-corrosion coating if peeled.

3

Stop ring

YG000020

Spring steel (65Mn), surface galvanized

1. Fatigue from repeated axial force; 2. Rust from moisture.

1. Inspect for deformation during maintenance; 2. Store spare parts in dry environment.

4

Gland slip

YG000015

Copper alloy (H62), wear-resistant

1. Abrasion from gland movement; 2. Scratching from foreign particles.

1. Clean mating surfaces before assembly; 2. Replace if wear exceeds 1.5mm.

5

Gland sleeve

YG000017

Alloy steel (40Cr), precision machined

1. Inner wall wear from shaft rotation; 2. Corrosion from lubricant oxidation.

1. Replace lubricant regularly to avoid oxidation; 2. Check inner diameter monthly for wear.

1

Pin shaft

YG000002, YG000025

Alloy steel (42CrMo), quenched and tempered

1. Wear from rotational friction; 2. Shear failure from misaligned load.

1. Install cotter pins to prevent rotation; 2. Inspect for shear cracks quarterly with magnetic particle testing.

2

Side plate

YG000007

Forged alloy steel (Q355B), API 8C

1. Bending deformation from uneven load; 2. Corrosion from wellsite salt/moisture.

1. Ensure uniform load distribution; 2. Apply marine-grade anti-corrosion coating annually (offshore use).

3

Clamp nut

YG000014

High-strength steel (35CrMo), self-locking design

1. Loosening from vibration; 2. Thread wear from repeated assembly.

1. Retorque every 300 operating hours; 2. Replace if threads are stripped or damaged.

4

Top cover

YG000008

Carbon steel (Q235B), sealed design

1. Deformation from impact; 2. Seal failure from aging.

1. Avoid collision during transportation/maintenance; 2. Replace sealing gasket annually.

5

Central shaft

YG000009

Alloy steel (42CrMo), precision ground

1. Wear from bearing rotation; 2. Bending from radial load.

1. Monitor runout during operation (≤0.05mm); 2. Lubricate bearings regularly to reduce friction.

6

Spring seat

YG000025

Alloy steel (40Cr), heat-treated

1. Wear from spring compression; 2. Corrosion from lubricant contamination.

1. Check spring seat surface for pitting; 2. Replace lubricant if contaminated with metal particles.

7

Intermediate spacing disc

YG000020

Stainless steel (304), wear-resistant

1. Abrasion from adjacent components; 2. Deformation from axial pressure.

1. Ensure proper spacing during assembly; 2. Replace if thickness wear exceeds 1mm.

8

Load body

YG000023

Forged alloy steel (42CrMo), API 7K

1. Fatigue from repeated heavy loads; 2. Corrosion from wellsite environments.

1. Operate within rated load; 2. Inspect for cracks annually with ultrasonic testing.

9

Central body

YG000024

Alloy steel (20CrMnTi), carburized

1. Wear from internal component movement; 2. Corrosion from moisture intrusion.

1. Maintain sealing integrity; 2. Clean internal cavity during major maintenance.

10

Slip

YG000011

Copper-based alloy, anti-slip design

1. Abrasion from drill string contact; 2. Deformation from over-tightening.

1. Check slip grip weekly; 2. Replace if anti-slip teeth are worn.

Are these parts compatible with all YG series travelling blocks (YG40-YG350)?

Most parts are cross-compatible within the series, but verify part numbers (e.g., YG000001 sheave) with CPTDC’s model specification. For YG350 (max load 350kN), use reinforced parts (e.g., 42CrMo pin shafts) to match higher loads.

What lubricant grade is recommended for sheave bearings and pin shafts?

Use API 5GL synthetic lubricant (ISO VG 46 for normal temperature, ISO VG 68 for high-temperature wells). Avoid mineral oil, which degrades quickly in wellsite conditions.

How to verify genuine CPTDC parts?

Genuine parts have laser-etched part numbers (e.g., YG000001) and comply with API standards. Cross-check with CPTDC’s official part catalog; counterfeit parts often lack precision machining and anti-corrosion treatments.