At Global Boiler Services, we know that precise automation is vital for safe and efficient marine boiler operation. One of the most effective tools for achieving this control is the PID controller. In this article, we explain PID controller basics, the working principle of PID controllers, and why they are indispensable in modern marine boiler systems.

What is a PID controller?

A PID controller (Proportional-Integral-Derivative controller) is a control loop mechanism widely used across industrial automation and particularly in marine boilers.

What is a PID controller used for? In marine applications, it automatically adjusts key parameters such as steam pressure, water level, and fuel-air ratio to maintain stable operation. By continuously minimising deviation between the setpoint and the actual process value, it ensures safe and efficient boiler performance.

PID controller principle and working

The PID controller principle combines three control actions:

• Proportional (P): Responds immediately to the current error.
• Integral (I): Corrects accumulated past errors.
• Derivative (D): Predicts future deviations to stabilise response.

The working principle of a PID controller is based on real-time monitoring of process variables. It calculates the difference between the desired value (setpoint) and the measured variable, then adjusts control outputs accordingly. In a marine boiler, this might mean fine-tuning fuel supply, airflow, or water feed to maintain steam stability.

By balancing these three factors, PID controls enable smooth load transitions, minimise overshoot, and prevent fluctuations that could impact vessel performance or safety.

Benefits of PID controls in marine boiler systems

• Improved steam stability: Maintains consistent steam pressure and temperature.
• Optimised combustion: Reduces fuel consumption and emissions through precise control.
• Fast response: Handles load changes effectively, essential for propulsion and auxiliary systems.
• Reduced downtime: Prevents critical faults through accurate and predictive regulation.
• Compliance and longevity: Ensures safe operation in line with Class and IMO requirements.

Global Boiler Services – your partner for control and automation

At Global Boiler Services, we specialise in PLC-based PID controller systems for marine boilers. Our solutions integrate Siemens S7-series PLCs, providing long-term component availability and full parameter control via intuitive HMI interfaces.

We deliver:

• System design and engineering tailored to vessel requirements
• Onboard installation and commissioning by Class-certified engineers
• Worldwide spare parts and 24/7 support from our hubs in Denmark, Dubai, and Singapore
• Optimisation and retrofits for existing boiler control systems

Whether you need a full automation upgrade or fine-tuning of existing PID controls, our engineers ensure precision, reliability, and minimal downtime — anywhere in the world.