Bomco Rotary Table ZP375

1. Introduction

1.1 Equipment Compatibility & Core Purpose

This guide is exclusively tailored for the Bomco Rotary Table ZP375, a critical rotating mechanism specifically designed for Bomco drilling rigs—widely used in oil and gas exploration, well drilling, and downhole operation equipment. Its core purpose is to provide stable, precise rotational support for the kelly bushing and drill string, enabling smooth rotation, positioning, and torque transmission during drilling operations. It integrates multiple functional components (turntable, input shaft assembly, brake system, etc.) to ensure the drilling rig operates efficiently and safely under high-load conditions, which is indispensable for maintaining drilling accuracy and operational continuity.

1.2 Target User Segmentation & Demand Matching

This guide addresses the segmented needs of three core user groups: 1) On-site maintenance engineers: Need clear maintenance guidelines, fault diagnosis methods, and component replacement tips to minimize downtime; 2) Procurement managers: Require professional product specifications, compatibility information, and procurement standards to select genuine, compatible spare parts; 3) Drilling operation technicians: Need to understand the equipment’s functional principles, structural characteristics, and applicable working conditions to ensure correct operation and avoid improper use leading to failures. All content is designed to be practical, professional, and easy to apply, solving the key pain points of each user group.

2. Product Introduction

The Bomco Rotary Table ZP375 is a heavy-duty, high-precision rotating component independently developed for Bomco drilling rigs, integrating mechanical transmission, braking, sealing, and positioning functions. It is composed of more than 50 key components (including upper cover, cast welding base, turntable, input shaft assembly, kelly bushing, bearings, and various fasteners), all of which comply with Bomco’s strict quality control standards and industrial drilling equipment specifications (GB/T 3021-2013, the national standard for drilling rig components). The product adopts a modular design, facilitating component replacement and maintenance, while its high-strength structural design ensures long-term reliable operation under harsh drilling conditions.

3. Function Description

The Bomco Rotary Table ZP375 undertakes multiple critical functions in drilling operations, forming a complete functional system:

Rotational Transmission: Through the input shaft assembly (including bevel pinion, shaft, bearing sleeve, etc.) and sprocket components, it transmits the power of the drilling rig’s drive system to the turntable, driving the kelly bushing and drill string to rotate stably at the required speed, providing power for drilling.

Positioning & Locking: Equipped with left pawl, right pawl, control rod, and other components, it can quickly lock the turntable in a specific position during drilling pauses, pipe tripping, or maintenance, preventing accidental rotation and ensuring operational safety.

Braking Protection: The brake block component provides reliable braking force, which can quickly stop the turntable rotation in case of emergency or operational needs, avoiding equipment damage or safety accidents caused by uncontrollable rotation.

Lubrication & Sealing: Equipped with oil cup, oil scale, magnetic plug, oil seal, and O-ring components, it realizes closed-loop lubrication and sealing of internal moving parts, preventing lubricating oil leakage and external dust, mud, and other contaminants from entering, extending the service life of components.

Load Bearing: The cast welding base, turntable, and bearing components form a stable load-bearing structure, which can bear the huge axial and radial loads generated during drilling, ensuring the stability of the drilling rig during high-load operation.

4. Structural Characteristics

The Bomco Rotary Table ZP375 adopts a scientific and reasonable structural design, combining durability, maintainability, and precision, with the following prominent characteristics:

Heavy-Duty Base Structure: The cast welding base (AG24003-02.00) adopts high-strength steel cast welding technology,经过 stress relief treatment, which has strong load-bearing capacity and deformation resistance, ensuring the overall stability of the turntable during high-load operation.

Modular Transmission Design: The input shaft assembly (AG24003-11.00) and turntable (AG24003-09.00) adopt a modular design, with clear division of labor between components. The bevel pinion, bearing sleeve, and other parts are independently assembled, which is convenient for disassembly, inspection, and replacement, reducing maintenance time and labor costs.

Reliable Sealing & Lubrication Structure: Multiple sealing components (O-ring, oil seal, gasket) are arranged at key positions to form a multi-layer sealing protection system; the magnetic plug (AG24003-12.00) can absorb metal debris in the lubricating oil, ensuring the cleanliness of the lubricating system and protecting internal moving parts from wear.

Precision Positioning Mechanism: The pawl (left/right), control rod, and control rod pin components form a high-precision positioning mechanism, which can realize quick locking and unlocking of the turntable, with accurate positioning and reliable operation, ensuring the safety of drilling operations.

Standardized Fastener Configuration: All fasteners (bolts, nuts, spring washers, cotter pins) adopt national standard specifications (GB70-85, GB93-87, etc.) and Bomco special specifications, ensuring the interchangeability and reliability of components, facilitating procurement and replacement of spare parts.

5. Applicable Working Conditions

The Bomco Rotary Table ZP375 is specially designed for harsh oil and gas drilling environments, with strong environmental adaptability, and is applicable to the following working conditions:

Drilling Type: Onshore oil and gas drilling, shale gas drilling, geothermal drilling, and other drilling operations that require stable rotational support of the drill string.

Environmental Conditions: It can operate normally in high-temperature ( -20℃ ~ 60℃ ), high-humidity (relative humidity ≤ 95% ), dusty, and muddy environments, and is resistant to corrosion of general industrial pollutants (excluding strong acids and alkalis).

Load Conditions: Suitable for medium and heavy-duty drilling rigs, capable of bearing axial loads up to 3750kN and radial loads up to 1800kN, adapting to high-torque drilling operations (torque range: 0 ~ 120kN·m).

Working Medium: Compatible with standard industrial lubricating oil (ISO VG 46 ~ 68), and can operate normally under the condition that the lubricating oil is free of excessive impurities and moisture.

Operational Scenarios: Suitable for continuous drilling operations, pipe tripping operations, well completion operations, and other scenarios, and can adapt to intermittent or long-term continuous operation modes.

6. Maintenance & Care Suggestions

Scientific and regular maintenance is the key to extending the service life of Bomco Rotary Table ZP375, reducing fault rates, and ensuring stable operation. The following maintenance suggestions are provided based on on-site practical experience and Bomco equipment maintenance specifications:

Daily Inspection (Before Operation): Check the oil level of the lubricating system through the oil scale (AG24003-04.00), ensuring it is within the standard range (between the upper and lower limit marks); check for oil leakage at the oil seal, O-ring, and flange connections, and deal with it in time if found; check the tightness of fasteners (bolts, nuts, pins), and re-tighten if loose; check the brake block (AG24003-05) for wear, and replace if the wear amount exceeds 3mm.

Regular Lubrication: Inject lubricating oil into the lubricating system through the oil cup (GB1152-74) every 8 hours of operation; replace the lubricating oil every 500 hours of operation, and clean the oil tank and magnetic plug (AG24003-12.00) at the same time, removing metal debris and impurities; apply lubricating grease to the pawl, control rod, and other moving parts every 24 hours of operation to ensure flexible movement.

Periodic Inspection (Every 1000 Hours of Operation): Disassemble and inspect the input shaft assembly, check the wear of bevel pinion (AG24003-11.01), bearing (GB283-64, GB286-64), and bearing sleeve (AG24003-11.04.00), and replace if worn; check the wear of the turntable (AG24003-09.00) and bull gear (AG24003-09.02), and grind or replace if the tooth surface is worn or pitted; check the sealing performance of O-rings and oil seals, and replace aged or damaged ones in time.

Fault Prevention: Avoid overloading the turntable (strictly operate within the rated load range); prevent hard objects (drill cuttings, metal debris) from entering the internal structure of the turntable, and clean the surface and surrounding area of the turntable regularly; avoid sudden start and stop of the turntable during operation, and operate smoothly to reduce impact on internal components; store spare parts in a dry, clean environment to avoid corrosion and damage.

Maintenance Record: Establish a complete maintenance record, including daily inspection results, lubrication time and oil type, component replacement time and model, and fault handling process, which is convenient for tracking the operation status of the equipment and providing a basis for subsequent maintenance and procurement.

Bomco Rotary table ZP375

7. On-Site Fault Maintenance Cases

The following cases are real on-site fault cases of Bomco Rotary Table ZP375, providing detailed fault phenomena, cause analysis, and solutions, which can be used as a reference for on-site maintenance personnel to solve similar problems:

Case 1: Turntable Rotation Stiff & Abnormal Noise

Fault Phenomenon: During on-site drilling operation, the Bomco Rotary Table ZP375 turntable rotates stiffly, accompanied by harsh metallic noise, and the input shaft assembly becomes hot after 30 minutes of operation, resulting in reduced drilling speed and unstable operation.

Cause Analysis: After disassembly inspection, it was found that the lubricating oil in the turntable was seriously deteriorated and mixed with a large amount of metal debris; the magnetic plug (AG24003-12.00) was blocked and failed to play a role in filtering debris; the bearing (GB283-64 32630) was severely worn due to lack of effective lubrication, and the bearing sleeve (AG24003-11.04.00) had obvious scratches.

Solution: Drain the deteriorated lubricating oil completely, clean the oil tank and oil circuit with diesel oil; replace the blocked magnetic plug with a new original part; replace the worn bearing and bearing sleeve with genuine Bomco parts; inject new ISO VG 68 lubricating oil into the lubricating system, and check the oil level to ensure it meets the requirements; reassemble and test, the turntable rotates smoothly without noise, and the fault is completely resolved.

Case 2: Turntable Locking Failure

Fault Phenomenon: During pipe tripping operation, the operator tried to lock the turntable by operating the control rod (AG22005-06.00), but the turntable could not be locked and still rotated slowly, which posed a serious safety hazard to on-site operation.

Cause Analysis: Inspection found that the left pawl (AG22005-01) and right pawl (AG22005-02) were severely worn, the tooth surface was smooth and could not engage with the bull gear (AG24003-09.02) effectively; the control rod pin (AG22005-03) was loose, resulting in insufficient stroke of the control rod, and the pawl could not be fully inserted into the tooth groove of the bull gear.

Solution: Replace the worn left and right pawls with new original parts; re-tighten the control rod pin and lock it with a cotter pin (GB91-86); adjust the stroke of the control rod to ensure that the pawl can be fully engaged with the bull gear when locked; test the locking function repeatedly, and the turntable can be locked quickly and reliably, ensuring on-site operation safety.

Case 3: Oil Leakage at Turntable Flange Connection

Fault Phenomenon: During daily inspection, it was found that a large amount of lubricating oil leaked from the flange (AG24003-16) connection of the turntable, resulting in a rapid decrease in the oil level of the lubricating system, and the ground around the turntable was contaminated with oil stains.

Cause Analysis: Disassemble the flange and find that the gasket (AG24003-13) between the flange and the turntable is aged, cracked, and loses its sealing performance; the bolts (GB5783-86) at the flange connection are loose, resulting in uneven pressure on the gasket and gaps at the connection.

Solution: Replace the aged gasket with a new original part (ensuring the model and size are consistent); clean the flange connection surface to remove oil stains and debris; re-tighten the flange bolts evenly with a torque wrench (torque: 45-50 ft-lbs), ensuring uniform pressure on the gasket; apply a thin layer of sealant on the gasket surface to enhance sealing performance; after assembly, check for oil leakage, and no leakage was found, the fault is resolved.

Case 4: Input Shaft Rotation Failure

Fault Phenomenon: The drilling rig drive system operates normally, but the input shaft assembly (AG24003-11.00) of the turntable does not rotate, resulting in the turntable being unable to work, and the on-site drilling operation is forced to stop.

Cause Analysis: After inspection, it was found that the key (AG24003-11.09) between the input shaft (AG24003-11.03) and the bevel pinion (AG24003-11.01) was sheared; the root cause was that the turntable was overloaded during drilling, and the torque exceeded the bearing capacity of the key, resulting in shear failure; in addition, the keyway had obvious wear, which aggravated the failure.

Solution: Replace the sheared key with a new original part (consistent with the model and material); repair the worn keyway by welding and grinding, ensuring that the fit between the key and the keyway meets the requirements; check the input shaft and bevel pinion for damage, and no other abnormalities were found; after assembly, test the operation, the input shaft rotates normally, and the turntable works stably; at the same time, remind the operator to strictly operate within the rated load range to avoid overloading again.

8. FAQ (Frequently Asked Questions)

9. Procurement Guidance

The stable and safe operation of Bomco Rotary Table ZP375 depends entirely on the quality and compatibility of its components. As a critical component of Bomco drilling rigs, the selection of genuine, high-quality spare parts is not only related to the service life of the equipment and the efficiency of drilling operations but also directly related to on-site personnel and equipment safety. To help you avoid procurement risks and ensure the quality of spare parts, we provide the following professional procurement guidance:

First, strictly match the equipment model and component model. All components must be consistent with the model specified in this guide (such as AG24003-09.00 turntable, AG15002 20" kelly bushing), and do not modify or replace them at will. For components with multiple specifications (such as double row sprockets with different Z values), please confirm the specific parameters (P=50.8, Z=19/20/21) according to the on-site equipment configuration to ensure compatibility.

Second, prioritize genuine Bomco parts. Genuine parts are independently produced by Bomco or authorized suppliers, complying with Bomco’s strict quality control standards and industrial specifications (GB/T 3021-2013), with precise size matching, high-quality materials, and reliable performance. Genuine parts can ensure perfect compatibility with your Bomco Rotary Table ZP375, reduce fault rates, and extend the service life of the equipment. Avoid purchasing counterfeit or inferior parts to save costs, which will lead to frequent failures, increased maintenance costs, and even equipment damage.

Third, pay attention to the quality of key components. For core load-bearing components (cast welding base, turntable, bull gear), transmission components (bevel pinion, input shaft, bearings), and safety components (brake block, pawl), please strictly check the material certificate and quality inspection report when purchasing to ensure they meet the strength, wear resistance, and safety requirements. These components are the key to preventing on-site faults and safety accidents.

Fourth, standardize the procurement process. Establish a regular procurement plan based on the maintenance cycle and equipment operation status, and reserve a certain amount of key spare parts (such as bearings, O-rings, gaskets) to avoid downtime caused by lack of spare parts. When purchasing, provide the complete component model (including the suffix, such as AG24003-11.00) to the supplier to avoid mismatches.

We are committed to providing you with professional procurement advice and high-quality spare part support for Bomco Rotary Table ZP375. Whether you need to purchase individual components or batch procurement, we can provide accurate model matching, quality verification, and technical guidance to help you reduce procurement costs, shorten maintenance downtime, and ensure the safe and stable operation of your drilling equipment.

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