Offshore hoses, also known as floating hose strings, are vital in the marine oil and gas industry, forming the key connection between vessels and offshore platforms or single point mooring (SPM) systems. A typical floating hose string includes multiple connected hoses, such as tanker rail hose, tail hose, reducer hose (optional), mainline hose, and one end reinforced hose. This guide covers everything from installation to regular maintenance and inspection, helping operators maximize hose performance and lifespan.
1. Pre-Installation Checklist
Before deploying floating hoses:
① Visual inspection: Check for cracks, cuts, or damage on the hose body and floatation layer.
② Pressure test: Conduct hydrostatic testing (as applicable) to verify hose integrity.
③ Specification match: Ensure hose types, diameters, and pressure ratings meet project requirements.
④ Component verification: Confirm all hoses, and their flanges, gaskets, and bolts are present and undamaged.
Pro tip: Use a documented pre-installation checklist for traceability and quality assurance.
2. Installation
Correct floating hose installation is critical to system performance and safety.
① Handling and Lifting
Always lift hoses using certified slings or spreader bars. Avoid using chains or ropes that can cause damage.
Never drop or drag hoses across rough decks or sharp edges.
Support hoses evenly during lifting to prevent kinks or localized stress.
② System Layout
Follow the manufacturer’s recommended bend radius to avoid internal damage.
Arrange the hose string with flexibility for wave movement, tide, and vessel drift.
③ End Connection Setup
Ensure all flanges are clean and aligned before tightening.
Use the correct torque sequence and pressure ratings on bolts and gaskets.
Install swivel joints or breakaway couplings where needed to accommodate rotation or emergency disconnection.
3. Operational Monitoring
Once deployed, constant observation during operation is necessary:
Assign trained operators to monitor hose movement, especially at connection points and curves.
For double carcass floating hoses, use interstitial pressure monitoring systems or pay attention to alarm light on the hose to detect leaks in the primary carcass.
Watch for signs like:
a. Unusual hose bending or stretching
b. Float loss or sinking sections
c. Leaks, bubbling, or fluid seepage
d. Excessive vibration or movement
4. Maintenance and Inspection
Routine inspection is essential to detect early wear and prevent marine hose failure.
① Daily Visual Inspection
Inspect before and after each operation.
Focus on:
a. Outer cover: cuts, abrasions, UV damage
b. Flange ends: rust, misalignment, or loose bolts
c. Float condition: cracks, detachment, or loss of buoyancy
② Leak Detection
Monitor pressure or vacuum levels in the annular space (for double carcass hoses only).
If pressure changes suddenly, isolate the hose and inspect for carcass breach.
③ Cleaning and Storage
After operation, flush internal bore using appropriate cleaning agents for the transferred fluid.
Rinse external surfaces and remove marine growth or debris.
Store hoses in a cool, dry place, supported evenly to prevent flat spots or warping.
④ Periodic Pressure Testing
Follow industry standards (e.g., OCIMF GMPHOM 2009) for scheduled pressure testing.
Keep test results for certification and audits.
5. Documentation and Lifecycle Management
① Maintain a detailed maintenance log for each floating hose string.
② Include dates of inspections, pressure tests, replacements, and repairs.
③ Use these records to schedule preventive replacements before failure occurs.
Conclusion
Offshore floating hoses are engineered to withstand demanding marine environments, but only when handled, installed, and maintained correctly. Following these practices ensures reliable fluid transfer, minimizes downtime, and helps you comply with environmental and safety standards. No matter what kind of marine hose you are using, a proactive approach to hose care will protect your investment and operations.
