Posted on September 14, 2025 by Airlink Compressors Team
For Stagecoach Bus in Plumstead, London, a reliable compressed air system is the backbone of their depot operations, powering everything from pneumatic tools to bus maintenance systems. When their aging Ingersoll-Rand R11 N air compressor began faltering—plagued by inefficiencies and frequent maintenance needs—they turned to Airlink Compressors for a modern solution. In just one day, we replaced it with the advanced Hertz FRECON PLUS PM 11kW VSD Direct Drive Base Mounted Screw Air Compressor, delivering unmatched efficiency and reliability. Here's how we did it.
The Challenge: An Aging Compressor Struggling to Keep Up
The Ingersoll-Rand R11 N, a 15 HP rotary screw compressor, had been a dependable workhorse for Stagecoach's Plumstead depot. However, years of heavy use revealed its limitations:
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Frequent Maintenance: Worn components like filters, separators, and belts required constant attention, driving up costs and downtime.
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Energy Inefficiency: Lacking modern variable speed drive (VSD) technology, the R11 N consumed excessive energy, inflating operational expenses.
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Operational Disruptions: Unreliable performance risked delays in bus maintenance, potentially affecting service schedules for thousands of London commuters.
Stagecoach needed a robust, energy-efficient replacement that could integrate seamlessly into their busy depot without causing disruptions. Airlink Compressors stepped in with a tailored solution: the Hertz FRECON PLUS PM 11kW VSD screw compressor, designed for high performance and sustainability.
The Solution: Hertz FRECON PLUS PM 11kW VSD Screw Compressor
The Hertz FRECON PLUS PM 11kW VSD Direct Drive Base Mounted Screw Air Compressor was the perfect fit for Stagecoach's needs. Here's why this cutting-edge system stood out:
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Variable Speed Drive (VSD) Efficiency: The VSD adjusts motor speed to match air demand, reducing energy consumption by up to 35% compared to fixed-speed models like the R11 N.
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Permanent Magnet (PM) Motor: The high-efficiency PM motor delivers superior performance with a compact design, ensuring consistent output of up to 1.65 m³/min at 7 bar.
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Direct Drive Technology: Eliminating belts reduces maintenance and energy losses, enhancing reliability and lowering costs.
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Quiet Operation: Operating at under 68 dB(A), it's ideal for depot environments where noise control is critical.
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Eco-Friendly Design: Lower energy use and compliance with modern standards support Stagecoach's sustainability goals, reducing their carbon footprint.
Sourced from Hertz's innovative lineup, this compressor promised not only operational excellence but also significant cost savings, making it a strategic upgrade for the depot.
Record-Time Installation: Seamless and Swift
At Airlink Compressors, we understand that downtime in a busy bus depot is not an option. We completed the entire replacement process—from decommissioning to commissioning—in just one day, ensuring minimal disruption to Stagecoach's operations. Here's the breakdown:
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Assessment and Decommissioning
Our expert engineers conducted a detailed site survey at the Plumstead depot, evaluating the existing Ingersoll-Rand R11 N setup. We decommissioned the old compressor during off-peak hours, ensuring no impact on bus maintenance schedules. All components were disposed of responsibly, adhering to environmental regulations. -
Installation
The pre-assembled Hertz FRECON PLUS PM 11kW VSD compressor was delivered and installed with precision. We integrated it with the depot's existing piping, electrical systems, and control panels. The direct drive system simplified setup, while custom base mounting and vibration dampening ensured stability and quiet operation. -
Commissioning and Training
We performed comprehensive pressure tests, leak checks, and performance calibrations to ensure optimal operation. Full-load simulations confirmed the compressor's output met Stagecoach's demands. Our team also trained depot staff on the intuitive controls and maintenance protocols, ensuring smooth long-term operation. By day's end, the system was fully operational, delivering clean, efficient compressed air.
This rapid turnaround was achieved through meticulous planning, in-house expertise, and close coordination with Stagecoach's maintenance team, keeping their operations on track.
The Results: A Win for Efficiency and Reliability
Since the installation, the Hertz FRECON PLUS PM has transformed Stagecoach Plumstead's operations. Key outcomes include:
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Uninterrupted Performance: Zero downtime in the first month, ensuring reliable air supply for critical maintenance tasks.
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Significant Cost Savings: Projected energy savings of 30% and reduced maintenance costs, freeing up resources for other depot priorities.
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Sustainability Boost: Lower energy consumption aligns with Stagecoach's environmental commitments, supporting greener public transport.
Sarah Jenkins, Depot Manager at Stagecoach Plumstead, said: "Airlink Compressors delivered beyond expectations. The new Hertz compressor is a game-changer for our operations, and the installation was so quick we barely noticed the transition. Their expertise made all the difference."
Why Airlink Compressors?
At airlinkcompressors.com, we specialize in delivering tailored compressed air solutions with minimal disruption. Our decades of experience, combined with partnerships with industry leaders like Hertz, ensure top-tier performance for clients like Stagecoach. From consultation to aftercare, we're committed to keeping your operations running smoothly.
Ready to upgrade your compressed air system? Contact Airlink Compressors today for a free consultation. Let's power your efficiency—together!