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Precautions for the use and operation of composite hoses
Hits: 719 Time: 2025.07.15
As the core component of industrial fluid transportation, composite hoses are widely used in petrochemical, shipping, environmental protection engineering and other areas. Its stable operation not only depends on the performance of the product itself, but is also closely related to operational standards and maintenance.
1、 Key preparations before use
1. Selection and matching
Medium compatibility: Select lining materials (nitrile rubber/NBR, polytetrafluoroethylene/PTFE, etc.) based on the conveying medium (such as gasoline, concentrated sulfuric acid, LNG), and pass ISO16528-2 chemical testing.
Pressure level matching: The working pressure should be ≤ 80% of the marked value of the hose, and the burst pressure should be at least 4 times the working pressure (refer to ISO13628-1).
Environmental adaptability:
 Temperature range: -40 ℃ to+120 ℃ (special working conditions require customized ultra-low/high temperature hoses);
 Installation space: Small bending radius ≥ 6 times the pipe diameter to avoid forced bending.
2. Arrival acceptance and testing
Appearance inspection:
 The woven layer has no broken wires or rust, and the outer protective layer has no bulges or cracks;
 The flange interface is flat, and the sealing surface roughness Ra is ≤ 3.2 μ m.
Stress testing:
Use clean water or nitrogen to conduct a pressure holding test at 1.5 times the working pressure (≥ 30 minutes), and a pressure drop of ≤ 0.5 bar is considered qualified.
Conductivity test: Confirm that the resistance value of the conductive layer is ≤ 10 Ω (in accordance with IEC60092-504 standard) through a grounding resistance tester.
2、 Core precautions during operation
1. Installation and connection
Anti distortion design:
During installation, keep the hose naturally stretched and the twisting angle should not exceed 15 °. If necessary, use a rotary joint.
Support and fixation:
 Install hangers every 1.5-2 meters to avoid bending stress concentration caused by self weight;
 Use chains or clamps to secure the interface, with torque values in accordance with AEB16.5 standard.
Electrostatic protection:
Maintain equipotential connection between the hose, equipment, and pipelines throughout the entire process, using grounding wires (cross-sectional area ≥ 10mm ²).
2. Media transport control
Flow rate management:
The initial flow velocity is ≤ 1m/s, gradually increasing to the design value (usually 3-5m/s) to avoid static electricity generated by turbulence (Stokes number ≤ 3000).
Pressure monitoring:
Real time monitoring of pressure fluctuations, automatic shut-off valve triggered when overpressure exceeds 10% (response time<0.5 seconds).
Temperature control:
When the medium temperature is greater than 80 ℃, an insulation layer or a circulating cooling system should be installed.
3. Response to dynamic working conditions
Vibration and impact:
Install flexible compensators near vibration sources such as compressors and pumps to reduce the risk of hose fatigue.
Special requirements for ship operations:
 Maintain a hose suspension angle of 15 ° -30 ° to avoid excessive stretching caused by wave impact;

 Real time monitoring of tension using a tension sensor, with an alarm for exceeding the threshold (120% of the workload).

3、 Typical accident causes and preventive measures
1. The rupture of the inner lining layer leads to medium leakage
Case: A refinery used NBR lined hoses to transport xylene, and after 6 months, pinholes leaked from the lining layer.
Reason: NBR is not afraid of insufficient swelling in aromatic solvents.
Preventive measures: Use FKM lined hoses or add barrier layers (such as aluminum foil).
2. Fracture of the reinforcement layer triggers explosion
Case: The hose of the high-pressure water cutting equipment burst after being used for 500 hours under a pressure of 300 bar.
Reason: The diameter deviation of the woven layer steel wire is greater than 5%, resulting in local stress concentration.
Prevention: Using 3D weaving technology to determine the uniformity of steel wire distribution within ± 2%.
3. Electrochemical corrosion of outer protective layer
Case: Large areas of rust appeared on the outer protective layer of the hose at the coastal dock, and the steel wire was exposed.
Reason: Under chloride ion environment, the carbon steel reinforcement layer and rubber form micro batteries.
Prevention: Use stainless steel braided layer or apply epoxy resin on the surface of the reinforcement layer.

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Hebei Biaohui Rubber& Plastic Products Co., Ltd. is a manufacturer and supplier of rubber hoses, plastic hoses, and rubber products. The main products include TPU layflat hoses, industrial hoses, material conveying hoses, silicone hoses, PTFE hoses, stainless steel metal hoses, and rubber plastic products.

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