One end reinforced half floating hose connects the CALM buoy with the mainline full floating hose. In a floating hose line, all hoses are designed to be full floating except this first off buoy hose. Its reinforced end should be connected to the hard pipelines on the buoy.
Double carcass one end reinforced hose is born with a leak detection system, which will remind the operator that the primary carcass has failed. This kind of hose structure provides a safer working condition.
The primary carcass is surrounded by the second carcass, but they are manufactured and inspected independently. When the inner carcass burst or leak, the outer carcass won't be affected. It will continue to work as normal and react to the failure, such as showing the red warning light, so that the operator can handle the damaged hose in time. Double carcass structure not only improves work safety, but also decrease the probability of economic loss and environmental pollution.
When the primary carcass fails, fluid will flow to the second carcass instead of entering the sea water. Although the remained carcass can function up to many years, damaged parts should be removed and replaced as soon as possible. Otherwise, accidents can show up anytime.
→Inner layer: NBR (Nitrile-Butadiene Rubber)
Feature: Resistant to fuel and oil; Smooth; Seamless
→Reinforcement: Multiple layers of high-strength textile cord + Embedded spiral steel wire
→Outer layer: Black synthetic rubber; Spiral orange stripes on the surface
Feature: Smooth; Resistant to abrasion, oil, sea water, and sunlight/UV ray
→Floating material: Closed-cell foam
→Minimum burst pressure
Primary carcass: 5 × Rated Working Pressure
Secondary carcass: 2 × Rated Working Pressure
→Fittings: ASME B 16.5 (Class 150, 300, 400, 600, 900, 1500, and 2500) or other standards flanges according to customer's request will be welded on the raised face, flat face, or other required face of the hose neck. Flange material options include carbon steel and stainless steel. There are several welding and sealing methods for you to choose.
→Flange standard: ANSI, GB, JIS, or DIN.
Test Report & Technical Analysis
By using the hydrodynamic software ORCAFLEX, we calculate floating hose data, such as bending moment, torque, and tension, and compare the results with design allowables. Environmental loads such as wind, wave and currents, as well as the excitation oscillations of FPSOs, tankers or moored buoys, are considered.
By doing Finite Element Analysis (FEA) with Abaqus, we focus on both the overall behavior and local details of the marine hose. We simulate temperature changes and hydrodynamic effects and analyze static and dynamic structures. Strain, stress, and deformation of the hose assessed. We can obtain accurate data, such as flexural, tensile, and tensional stiffness of the hose, rubber strain, cord tension, and reinforcing steel stress.
Import the ABAQUS static analysis results into the fatigue analysis software fe-safe, select the fatigue analysis theory, set the material parameters of each structural layer, load the above load spectrum, and we can get the fatigue analysis results.
