Session: 01-01-03 Offshore Platforms-3

Submission Number: 179526

Piping Vibration in Seawater Overboard Lines in Floating Production Storage and Offloading Unit 

Understanding and Mitigating Piping Vibration Issues in Industrial Systems

Introduction

Piping vibration is a critical concern in industrial facilities, particularly in oil & gas, petrochemical, and power generation sectors. If not properly addressed, vibration can lead to fatigue failures, operational inefficiencies, safety hazards, and costly downtime. This article explores the causes, consequences, detection methods, and mitigation strategies for piping vibration issues.

1. Causes of Piping Vibration

Piping vibration can originate from various sources, broadly categorized into:

A. Mechanical Sources

Rotating equipment: Pumps, compressors, and turbines can induce vibration through imbalance, misalignment, or bearing faults.

Flow-induced vibration (FIV): Caused by turbulence, vortex shedding, or pressure pulsations in the fluid.

Water hammer: Sudden changes in flow velocity due to valve operations or pump trips.

Acoustic resonance: Standing waves in piping systems due to pressure pulsations matching the natural frequency of the pipe.

B. Operational Factors

High flow velocities

Two-phase flow conditions

Rapid valve actuation

Poor support or restraint design

2. Consequences of Uncontrolled Vibration

Fatigue failure of pipe welds, supports, and connected equipment

Leakage at flanges and threaded connections

Noise pollution and operational discomfort

Reduced equipment life and increased maintenance costs

Safety risks due to potential rupture or fire hazards

3. Detection and Assessment Techniques

A. Visual Inspection

Look for signs of wear, fretting, or loosened supports.

B. Vibration Monitoring

Use accelerometers or velocity sensors to measure vibration levels.

Compare against industry standards like Energy Institute’s Guidelines for the Avoidance of Vibration Induced Fatigue Failure.

C. Modal and Dynamic Analysis

Finite Element Analysis (FEA) to determine natural frequencies and mode shapes.

Computational Fluid Dynamics (CFD) for flow-induced vibration prediction.

D. Acoustic Analysis

Evaluate pressure pulsations and resonance conditions using acoustic simulation tools.

4. Mitigation Strategies

A. Design Improvements

Avoid unsupported spans and ensure proper restraint placement.

Use expansion joints and flexible connectors where necessary.

Optimize pipe routing to minimize turbulence and flow disturbances.

B. Operational Controls

Gradual valve actuation to prevent water hammer.

Maintain balanced operation of rotating equipment.

C. Vibration Dampening

Install vibration isolators, snubbers, or tuned mass dampers.

Use viscoelastic materials or spring supports to absorb energy.

D. Regular Maintenance

Periodic inspection and tightening of supports.

Replacement of worn-out components.

5. Industry Standards and Guidelines

Energy Institute Guidelines (UK): Widely used for screening and assessment.

ASME B31.3: Provides general requirements for piping design.

API RP 686: Covers machinery installation and piping practices.

Conclusion

Piping vibration is a multifaceted issue that requires a proactive and multidisciplinary approach. Early detection, robust design, and continuous monitoring are key to ensuring system integrity and operational reliability. By integrating vibration management into the design and maintenance lifecycle, industries can significantly reduce risks and enhance performance.

 

Presenting Author: Radhouane Alaya SBM OFFSHORE

Presenting Author Biography: Radhouane Alaya
Group Technical Authority – Piping
With over 22 years of international experience in the oil & gas, power generation, and nuclear industries, I specialize in piping engineering across all project phases (PRE-FEED, FEED, EPC). I have led multidisciplinary teams of up to 25 engineers and designers, delivering major projects for clients such as SBM Offshore, BP, Total, Shell, Petrobras, and more, in Europe, Asia, Africa, and the Middle East.
My expertise covers advanced piping design, layout, stress analysis, and materials management for complex offshore and onshore projects, including FPSOs, FLNGs, and turret systems. I am certified in process safety, welding, vibration compliance, and hold a Master’s in Material Sciences from Mines Paris Tech. Known for strong leadership, problem-solving, and a proactive approach, I am committed to delivering efficient, safe, and cost-effective engineering solutions.

Authors:

Radhouane Alaya SBM OFFSHORE