1、 Multi layer composite structure: specially designed for ship fuel transmission The ship fuel hose adopts a four layer composite structure, which is suitable for the transportation needs of heavy oil, diesel and biofuels: Internal adhesive layer Oil resistant NBR (nitrile rubber), thickness ≥ 3.0mm, Shore hardness 75 ± 5, can withstand high sulfur fuel with sulfur content ≤ 5%; Enhancement layer Double layer 304 stainless steel wire weaving (tensile strength ≥ 2000MPa), weaving angle 55 °± 2 °, burst pressure ≥ 25bar (ISO 18296 standard); Compressive layer Spiral steel wire embedded in the adhesive layer to resist negative pressure flattening (vacuum degree ≥ 0.08MPa); Outer adhesive layer Weather resistant CR (chloroprene rubber)+CSM (chlorosulfonated polyethylene) blend adhesive, with a thickness of ≥ 2.0mm, resistant to ultraviolet radiation (QUV 1000 hours without cracking) and seawater erosion. 2、 Medium and pressure resistance performance: ensuring the safety of offshore oil transportation Ship fuel hoses must meet strict working conditions: Oil resistance According to ASTM D471 fuel immersion test (70 ℃ × 168h), the volume expansion rate is ≤ 15%; Voltage resistance level Working pressure: 1.0~4.0MPa (static)/0.6~3.2MPa (dynamic), pulse test passed 300000 times (ISO 6803 standard); Temperature range -30 ℃~+100 ℃ (conventional type)/-50 ℃~+125 ℃ (Arctic route specific type), low-temperature bending (-40 ℃ × 24h) without cracks. 3、 Adaptability to marine environment: design for resistance to salt spray and mechanical stress Solutions for special working conditions of ships: Salt spray corrosion resistance The outer adhesive layer passed a 720 hour salt spray test (5% NaCl), and the steel wire layer was galvanized and coated with epoxy resin; Resistance to mechanical damage Wear resistance of external adhesive (DIN 53516 test ≤ 60mm ³), capable of withstanding dock collisions and cable friction; Anti sway fatigue The reinforcement layer adopts a sine wave weaving structure, which can withstand sustained stress of ± 15 ° of ship roll; Anti static safety Surface resistance ≤ 1 × 10 ⁶ Ω, to avoid static electricity accumulation during fuel delivery (in accordance with IEC 60079 standard). Data: The hose with anti sway design has increased its service life by 40% in typhoon prone areas. Selection, installation, and full lifecycle management Key practices for extending service life: Selection criteria Select NBR material based on the sulfur content of the fuel and match the diameter according to the tonnage of the ship (recommended DN200~DN300); Installation specifications Bending radius ≥ 5 times the pipe diameter (DN100 hose ≥ 500mm), to avoid sharp angle bending that may cause the reinforcement layer to break;