Innovation & Technical Strengths
We build offshore equipment to survive the harshest marine environment – saltwater spray, high humidity, extreme temperatures, and explosive atmospheres. Here’s what makes SJ different:
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Marine-grade coating system – Three-layer epoxy paint (zinc-rich primer, intermediate, topcoat) applied over abrasive-blasted steel (Sa 2.5). Passes 1,500-hour salt spray test (ASTM B117). No red rust after 5 years offshore.
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ATEX / IECEx certified electricals – All motors, junction boxes, and control panels are explosion-proof (Zone 1, Group IIB/H2). Weatherproof enclosures rated IP56 or higher.
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Compact footprint design – Our offshore drawworks are up to 30% smaller than land equivalents, fitting tight platform deck spaces. Top drives have low-headroom profile for jack-up mast clearance.
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Corrosion-resistant materials – Stainless steel hardware, Monel® fasteners for BOP connections, and copper-nickel heat exchanger tubes. Optional duplex stainless steel for mud pump fluid ends.
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Motion-compensated systems – For floating vessels (semi-sub, drillship), our drawworks integrate active heave compensation. Maintain bit weight within ±5% in 5m waves.
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Remote-controlled BOP handling – Hydraulic BOP trolleys and gantry cranes with joystick control. Move 50-ton BOP stacks from storage to well center without manual rigging.
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Jack-up leg monitoring system – Real-time leg load, chord strain, and rack engagement sensors. Prevents overloading during preload or storm conditions.
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Integrated offshore mud mixing & solids control – Compact shaker decks, mud cleaners, and centrifuge packages designed for platform weight limits. Saves costly deck space.
Technical Specifications – Representative Offshore Products
| Product | Model / Series | Rated Capacity | Pressure / Power | Marine Features | Certification |
|---|---|---|---|---|---|
| Offshore Drawworks | SJ-OW 1000–3000 | 1,000 – 3,000 HP | 400 – 900 kN hook load | Active heave comp., low profile | ABS, DNV |
| Top Drive | SJ-TD 250–1250 | 250 – 1,250 HP | 15,000 psi circulating | Low-headroom (12 ft), dual-speed gear | ATEX, IECEx |
| Offshore Mud Pump | SJ-F 800–2200 | 800 – 2,200 HP | 5,000 – 7,500 psi | Duplex stainless fluid end option | ABS, API 7K |
| BOP Handling Gantry | SJ-BOP 50–150 | 50 – 150 tons lift | Hydraulic power pack | Marine-coated, remote control | DNV 2.7-1 |
| Offshore Crane | SJ-C 10–50 | 10 – 50 tons at 15m | Diesel or electric | Anti-two block, overload protection | ABS pedestal crane |
| Jack-up Skidding System | SJ-SK 300–1200 | 300 – 1,200 tons push/pull | Hydraulic | Synchronized jacking & skidding | ABS, Lloyd's |
| Mud Gas Separator | SJ-MGS 500–3000 | 500 – 3,000 GPM | 150 psi shell | SS internal baffles, coating | ASME Sec VIII |
| Shale Shaker Package | SJ-SH 3–6 panels | 400 – 800 GPM per unit | Explosion-proof motors | Stainless basket, quick-tension screen | ATEX Zone 1 |
Applications – Where Our Offshore Equipment Operates
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Fixed platform drilling & workover – Permanent production platforms in shallow to medium water depths (e.g., Bohai Bay, North Sea, Persian Gulf). Our drawworks and top drives run 24/7.
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Jack-up drilling rigs – Self-elevating units for exploration and development drilling in water depths up to 400 ft. SJ supplies complete drilling packages including skidding systems.
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Semi-submersibles & drillships – Heave-compensated drawworks and motion-compensated top drives for deepwater and ultradeepwater floating drilling.
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Offshore production – Mud pumps, chemical injection skids, and well test manifolds on FPSOs and platform decks.
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Subsea support vessel – Launch and recovery systems (LARS) for ROVs and subsea tree deployment – custom engineered.
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Jack-up leg repair & upgrade – Replacement skidding systems and jacking gear boxes for aging rigs.
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Offshore well intervention – Compact workover packages for platform or jack-up rigs, including coiled tubing injector heads and BOP stacks.
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Wind turbine installation vessels (transition) – Heavy-lift cranes and motion-compensated pile driving systems (custom inquiry).
Why Choose SJ Petroleum Machinery for Offshore Equipment?
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Sinopec subsidiary – offshore experience since 1980s – We have supplied equipment to over 50 offshore rigs in China and Southeast Asia. Our designs incorporate lessons from cyclone conditions, high-H2S fields, and deepwater challenges.
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ABS, DNV, BV, Lloyd’s certified – All offshore equipment can be third-party witnessed and certified to class society rules. We have in-house quality engineers who manage the certification process.
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Compact & lightweight engineering – We optimize structural design using FEA to reduce weight without sacrificing strength. Every ton saved on your platform lowers installation cost.
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Corrosion resistance proven in field – Our coating system and material selection have been validated on platforms operating for over 10 years in the South China Sea (high humidity, high salt).
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Full documentation package – We provide: material certs, NDT reports (UT, MT, RT), pressure test records, coating thickness logs, and as-built drawings. All in English.
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Global offshore parts support – We stock wear parts for drawworks, top drives, and mud pumps at hubs in Singapore, Dubai, and Houston. Emergency spares shipped within 48 hours.
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On-site commissioning & training – Our field engineers travel worldwide to supervise installation, perform load tests, and train your offshore crew on maintenance and safety.
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Competitive pricing vs. European/US suppliers – Typically 25–35% lower for equivalent ABS-certified equipment. And we deliver on schedule.
Frequently Asked Questions (FAQ)
Q1: What is the difference between your offshore and onshore equipment?
A: Offshore equipment has marine-grade coating (salt spray resistant), explosion-proof electricals, compact footprint, and usually third-party class certification (ABS, DNV). Onshore equipment is larger and does not require these features.
Q2: Can your offshore equipment be installed on a jack-up rig built to a different class society?
A: Yes. We have experience with ABS, DNV, BV, Lloyd’s, and CCS. We will design and test according to your rig’s class rules. Third-party surveyor attendance can be arranged at our factory.
Q3: What heave compensation accuracy can your drawworks achieve on a semi-submersible?
A: Our active heave system maintains bit weight variation within ±5% of setpoint in sea states up to 5m significant wave height. For drillships, we add passive tensioner compensation for riser tension.
Q4: How do you protect against galvanic corrosion between dissimilar metals?
A: We use insulating gaskets, coated fasteners, and sacrificial anodes on all subassemblies. For critical connections (e.g., stainless to carbon steel), we specify isolation kits.
Q5: What is the typical delivery lead time for an offshore drilling package?
A: 12–15 months for a complete package (drawworks, top drive, mud pumps, BOP handling). Individual components (e.g., one mud pump) can ship in 6–8 months.
Q6: Do you provide vibration analysis and alignment services during installation?
A: Yes. Our commissioning team uses laser alignment tools and portable vibration analyzers to verify mounting and shaft alignment. Reports included in final handover.
Q7: Can your offshore cranes handle subsea equipment launches?
A: Our larger cranes (50 ton class) can be fitted with heave-compensated A-frames for LARS operations. Please provide required lift capacity and water depth for custom engineering.
Q8: How do you manage spare parts inventory for my offshore rig?
A: We can create a recommended spares list based on your equipment configuration and expected operating hours. We also offer consignment stock agreements for fleet operators.
Q9: What kind of warranty do you offer for offshore equipment?
A: Standard 12 months from commissioning or 18 months from factory shipment. Extended warranties (up to 36 months) available for power end of mud pumps and drawworks bearings.
Q10: How do I get a proposal for an offshore equipment package?
A: Please provide: type of rig (jack-up, semi-sub, platform), water depth, drilling depth requirement, top drive HP, number of mud pumps, and desired class society. We will respond with a technical proposal within 10 working days.
