FZ3570/2FZ3570 Steam Heated Ram Blowout Preventer (BOP)

Core Purpose & Equipment Adaptation

This guide is dedicated to the FZ3570 single ram and 2FZ3570 double ram steam-heated ram blowout preventers—high-pressure well control equipment engineered for extreme oil and gas drilling scenarios. It addresses the specialized needs of drilling contractors, on-site maintenance technicians, and procurement teams, providing model-specific insights to ensure API 16A-compliant operation, mitigate downtime from thermal stress and high-pressure wear, and maintain reliable sealing integrity in harsh downhole environments with rated working pressure up to 70MPa (10000psi).

Product Overview

The FZ3570/2FZ3570 series steam-heated ram BOPs feature a uniform bore size of 346.1mm (13 5/8 in), tailored to accommodate a wide range of tubing/casing sizes from 2 3/8” to 10 3/4”. Designed for high-pressure operations, they boast a rated working pressure of 70MPa (10000psi) and a hydrostatic test pressure of 105MPa (15000psi), with metal materials meeting T-75 temperature grade standards for stable performance in high-temperature steam-assisted drilling. The single ram (FZ3570) weighs 6812kg, while the double ram (2FZ3570) offers redundant sealing with a weight of 14440kg, catering to both standard and high-risk well control requirements.

Functional Characteristics

These BOPs are equipped with a hydraulic control system operating at a rated pressure of 21MPa (3000psi), with a recommended working range of 8.4-10.5MPa (1200-1500psi) to balance sealing efficiency and component durability. The hydraulic cylinders provide precise actuation, with opening capacities of 17.4L×2 (single) / 17.4L×4 (double) and closing capacities of 20L×2 (single) / 20L×4 (double) for rapid response. They support multiple ram configurations—pipe rams, shear rams, and variable diameter rams—along with a secondary seal system and mechanical locking shaft to ensure fail-safe operation even under extreme pressure fluctuations.

Structural Features

The BOPs adopt a robust one-piece alloy steel body for exceptional high-pressure resistance and corrosion resilience. Key structural components include interchangeable ram assemblies (DFZ1310.01 series) with precision-machined ram blocks and high-temperature packers, side door seal structures with D-rings and float seal skeletons, and multi-layer ram shaft seals (Y-rings, backup rings) to prevent fluid leakage. The double ram model (2FZ3570) integrates two independent ram sets for redundant sealing, while the hinge structure and piston assembly (equipped with U-rings and wear rings) ensure smooth actuation and long service life. All sealing components are compatible with steam heating, avoiding hardening or degradation under high-temperature conditions.

Applicable Working Conditions

Ideal for onshore and offshore heavy oil development, deep well drilling, and high-pressure gas wells requiring steam assistance for viscosity reduction. Suitable for working temperatures matching T-75 metal grade standards, and compatible with diverse tubing/casing sizes (2 3/8” to 10 3/4”) for versatile well control. Widely used in environments where ambient temperatures are low, as the steam heating function maintains seal elasticity and prevents operational jamming. Particularly effective in wells with working pressures up to 70MPa, such as deep carbonate reservoirs and heavy oil steam injection wells.

Maintenance & Care Recommendations

Conduct bi-weekly inspections of hydraulic lines, seal integrity, and locking shaft operation to detect leaks or wear early. Replenish secondary sealing grease (EM-09-1) every 3 months and clean check valves (SFZ1310.32-00) to ensure unobstructed grease flow. Replace elastomeric seals (O-rings, Y-rings, D-rings) every 6 months or if signs of swelling, cracking, or wear are observed—prioritize genuine parts (e.g., SKZF135.01 Y-rings, 2FZ35105A.03-14 D-rings) for compatibility. Perform annual hydrostatic tests per API 16A § 10.3 to verify pressure resistance. Store spare parts in a dry, low-humidity environment (≤60% RH) to prevent elastomer aging and metal corrosion.

FZ3570 Steam Heated Ram BOP

Specification and main technical parameters of Ram BOP

Parts of pipe ram

Parts list of shear ram assembly

Parts list of variable diameter ram assembly

Part list of Side Door Seal Structure

Part list of Ram Shaft Seal Assembly

Parts list of Secondary Seal System

Parts list of Locking Shaft Seal Assembly

Parts list of Hinge structure

Parts list of Piston Assembly

Spare Parts list for one year

 Field Fault Repair Cases

Case 1: Ram Shaft Seal Leakage (FZ3570)

Symptom: Hydraulic fluid leakage at the ram shaft during steam-assisted drilling. Root Cause: Y-rings (SKZF135.01) worn and deformed due to long-term exposure to high-temperature steam, losing sealing capability. Repair: Replaced Y-rings and backup rings (SKZF135.02), cleaned the shaft surface, and applied high-temperature lubricant compatible with EM-09-1 grease. Preventive Measure: Inspect Y-rings monthly; replace every 4 months in high-steam environments.

Case 2: Secondary Seal System Failure (2FZ3570)

Symptom: Poor sealing performance after ram closing, with slight fluid leakage. Root Cause: Secondary sealing grease (EM-09-1) depleted, and check valve (SFZ1310.32-00) clogged by debris from hydraulic fluid. Repair: Refilled EM-09-1 grease, disassembled and cleaned the check valve, and tested seal integrity under 70MPa pressure. Preventive Measure: Filter hydraulic fluid before use; clean check valves and replenish grease every 2 months.

Case 3: Locking Shaft Jamming (2FZ3570)

Symptom: Inability to lock or unlock the ram after actuation, affecting well control response. Root Cause: Lip ring (2FZ1870DBYS.03.22-00) worn and wiper ring (SFZ1310-23) damaged, causing debris accumulation and shaft misalignment. Repair: Replaced lip ring, lip ring cover, and wiper ring, realigned the locking shaft, and removed debris from the seal assembly. Preventive Measure: Clean the locking shaft assembly every 6 weeks; lubricate with high-temperature grease during maintenance.

Case 4: Piston Seal Wear (FZ3570)

Symptom: Reduced hydraulic pressure during ram closing, with delayed actuation. Root Cause: U-rings (SFZ1310-13) and wear rings (SFZ1310-12) on the piston assembly worn by pressure pulsation, leading to internal leakage. Repair: Replaced U-rings, wear rings, and O-rings (106×5.3), adjusted hydraulic operation pressure to 9.5MPa, and tested piston actuation. Preventive Measure: Maintain hydraulic pressure within 8.4-10.5MPa; inspect piston seals every 3 months.

FAQ

Procurement Guidance

Genuine parts are indispensable for the safe and reliable operation of FZ3570/2FZ3570 steam-heated ram BOPs, especially in high-pressure, high-temperature environments. We supply all model-specific components—including ram assemblies, seals, hydraulic parts, shear rams, and secondary seal systems—fully compliant with API 16A and T-75 temperature grade standards. Each part comes with traceable material certificates to guarantee compatibility, durability, and adherence to well control safety norms. Our technical team provides personalized spare parts inventory plans and maintenance consultations based on your drilling conditions and equipment model. Contact us to secure authentic parts that minimize downtime, maintain optimal well control performance, and support efficient high-pressure steam-assisted drilling operations.

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