Essential for repairing oil pipelines! Recommended high flexibility rubber hose
1、 Core technical characteristics of petroleum specific rubber hoses
Petroleum specific rubber hose is a special rubber product designed to meet the harsh working conditions of the petroleum extraction, refining, and storage and transportation industries. Its core performance indicators include:
Oil and temperature resistance: The inner rubber layer is made of nitrile rubber (NBR) or hydrogenated nitrile rubber (HNBR) formula, and the oil resistance meets ASTM D471 standard. After soaking in IRM903 oil for 168 hours, the volume change rate is ≤± 10%, and the temperature resistance range covers -40 ℃ to 150 ℃.
Pressure bearing capacity: The enhanced layer is wrapped with 4-6 layers of high-strength steel wire, and the blasting pressure can reach 4-5 times the working pressure. Typical specifications such as DN50 rubber hose can achieve a burst pressure of over 84MPa at a working pressure of 21MPa.
Antistatic and flame retardant properties: Embedded with conductive copper wire to achieve a surface resistivity of ≤ 10 ⁶ Ω, in compliance with API RP 7J requirements; Add flame retardant to the outer adhesive layer, with an oxygen index of ≥ 32, meeting the UL94 V-0 flame retardant rating.
Pulse resistance performance: Through dynamic fatigue testing (100000 pulse cycles, pressure fluctuation range ± 20%), ensure a lifespan of ≥ 5 years in reciprocating motion equipment.
2、 Key technical requirements for API standard rubber hoses
API standard rubber hoses need to pass certifications such as API 7K, API 16C, API 16D, etc. The core indicators include:
API 7K (Drilling Equipment Rubber Hose):
Mud transportation: Inner rubber layer hardness 65-75 Shore A, wear resistance (DIN 53516 standard) ≤ 150mm ³ wear amount (after 500 hours of testing)
Fire resistance performance: Passed API 16D standard 15 minute flame impact test, maintaining integrity for 30 minutes
API 16C (throttling and well killing hose):
Dynamic sealing: The end joint needs to pass 1000 bending tests (curvature radius 5 times the pipe diameter) without leakage
Low temperature toughness: No cracks in impact test at -46 ℃ (ASTM D746 standard)
API 16D (Fireproof Rubber Hose):
Fire resistance limit: After being exposed to a flame at 1093 ℃ for 15 minutes, maintain pressure integrity for 30 minutes
3、 Application scenarios and technical adaptation of petroleum specific rubber hoses
1. Mud circulation system of drilling platform
Working condition characteristics: high-density drilling fluid (density 1.2-2.5g/cm ³), solid content 10% -30%, pulse pressure (0-35MPa)
Technical adaptation:
Adopting a double-layer steel wire winding reinforcement structure, with graphite powder added to the inner adhesive layer to enhance self-lubricating properties
Add anti slip design at the joint and pass API 7K standard vibration test (frequency 25Hz, amplitude ± 3mm)
Case study of a certain offshore drilling platform: Using API 7K certified rubber hoses to transport mud containing 25% barite powder, the annual replacement rate was reduced by 60%
2. High temperature oil transportation in refineries
Operating conditions: medium temperature of 120-180 ℃, sulfur content of 0.5% -3%, pressure of 0.8-2.5MPa
Technical adaptation:
The inner rubber layer adopts a composite structure of EPDM rubber and HNBR, which is resistant to hydrogen sulfide corrosion
Add anti ozone agent to the outer layer and pass the aging test
Case: When transporting crude oil containing 2% sulfur, the service life of the rubber hose can reach 3 years (traditional NBR rubber hose is only 6 months)
3. Maritime transportation
Characteristics of operating conditions: Multiphase flow (oil gas water volume ratio 1:1:1), sand content of 0.1% -0.5%, wave impact load
Technical adaptation:
Adopting a flexible armor structure (internal steel wire+external polyurethane sheath), the bending fatigue resistance is improved by three times
Coating the inner wall with PTFE to reduce the frictional resistance of oil and gas mixtures
4. Well control equipment well control system
Working condition characteristics: high pressure (70-105MPa), transient impact load, H ₂ S concentration 100-1000ppm
Technical adaptation:
All metal joint design, passed API 16C standard 5000 pressure cycle tests (0-105MPa)
Add zinc based sulfur inhibitor to the inner adhesive layer, in compliance with NACE TM0177 standard A solution test
Case study of a shale gas well: In a well killing operation containing 500ppm H ₂ S, there was no hydrogen embrittlement or cracking phenomenon in the tubing
4、 Key indicators for selection and maintenance
1. Parameter matching principle
Pressure rating: The maximum working pressure of the system should be lower than 80% of the nominal pressure of the hose, such as the 21MPa hose certified by API 7K. The actual operating pressure should not exceed 16.8MPa
Media compatibility:
Aromatic hydrocarbons (such as benzene and toluene) should be lined with fluororubber
Media containing H ₂ S must pass NACE MR0175 certification
Temperature range: Standard rubber hoses are suitable for temperatures ranging from -20 ℃ to 120 ℃, and special formulations are required for low temperature conditions (below -40 ℃)
2. Installation and maintenance specifications
Bending radius: The minimum bending radius of DN50 rubber hose shall not be less than 500mm, otherwise it may cause the steel wire layer to break
Pressure test: After installation, a water pressure test at 1.5 times the working pressure is required, and the pressure should be maintained for 30 minutes without leakage
Regular testing:
Monthly inspection of external adhesive layer cracks and loose joints
Ultrasonic testing is conducted every six months to detect the degree of corrosion in the steel wire layer
Replace rubber hoses that meet the API standard for fatigue frequency every year