Mooring line integrity is a real issue, with over 50 mooring line failures over the last 20 years with some resulting in huge remediation costs to Oil & Gas Operators. Proactively monitoring the integrity of mooring lines is critical. Pulse Structural Monitoring are leaders in offshore structural monitoring especially with regard to mooring integrity monitoring in which they have completed many successful deployments of mooring line inclination monitoring systems, as well as direct line tension in chain stoppers using low profile load cells. Subsea equipment can be installed by divers or using ROV as required. This presentation highlights the issue and some of the available technologies for monitoring mooring lines.

1. www.pulse-monitoring.com
Mooring Line
Integrity Monitoring

2. www.pulse-monitoring.com
Mooring Line Failures
Ref: Underlying causes of Mooring line Failures
24th March 2015
• 107 mooring incidents from 73 facilities across the industry (1997-2012)
• 51 single line failures – 9 multiple line failures
• 38 pre-emptive replacement events – 9 reports of severe degradation
• 150 lines replaced/repaired 2001-2011 (Ref: OTC 24181)

3. www.pulse-monitoring.com
Failures rate per line per year of exposure (1997 – 2014)
Mooring Line Failures
• Long term Mooring system design life: 15-25yrs
• 1:50 chance of a failure per asset per year
• Considering 25 years of design life: chance of 50% failure
during the lifetime of a mooring line
Ref: Underlying causes of Mooring line Failures
24th March 2015
50% chance of
failure of a
mooring line

4. www.pulse-monitoring.com
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INCIDENTINCIDENT
Enhancing operational safety
Safety Barrier Principle
Fatigue
Corrosion
Overload
Multiple line failure
Loss of production
early detection of
single line failure
Monitoring fatigue
accumulation
N-1 design
Environmental
damage
Monitoring tension & fatigue
Extreme tensions and cumulative
fatigue issue
Detection of single mooring line failure
Preventative action to prevent multiple line
failure
Detection of large
tension events

5. www.pulse-monitoring.com
Pulse Mooring Monitoring Solutions
Topside tension (Load cells)
In-line tension (Inter-M Pulse)
Mooring line inclination
Excursion monitoring

6. www.pulse-monitoring.com
Main mooring monitoring technologies - comparison
How to Monitor?
Parameter Inclination In-line Tension Load Cells
Data
Communication
Acoustic Acoustic Hardwired
Data Availability On Demand On Demand Continuous
Direct Tension   
Battery Life
Dependent on
operating mode
Dependent on
operating mode
Unlimited
Reliability High High Low
Serviceable   
Retrofittable   

7. www.pulse-monitoring.com
Improving reliability
Mooring Integrity Monitoring
• Assist with development of specification
• Early involvement with project
• System redundancy
• Serviceable systems
DesignInstallation
• Robust installation procedure
• Use experience and best practice
• Cable management
• Smart integration
Operation
• Ongoing maintenance & service plan
• Data analysis and reporting
• Not “fit and forget”

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Questions on How to
specify a mooring line
monitoring system ?
www.pulse-monitoring.com
Contact Us
info@pulse-monitoring.com
www.pulse-monitoring.com