Data centres & critical IT

Why fuel quality is a data centre risk

Data centres are often advised to hold at least three days of diesel or HVO on site so generators can run at full load through an extended outage. But stored diesel has a shelf life. In low-turnover tanks, water ingress, microbial growth and particulate build-up can quietly degrade fuel for months or years, until the moment a generator is called on and filters block, engines struggle to start, or sets shut down mid-outage. The cost of that failure goes well beyond lost revenue: SLA penalties, customer churn and reputational damage can follow for years. Contaminated fuel is one of the leading causes of unplanned generator downtime, and one of the most preventable.

WASP provides a complete range of fuel maintenance, handling and conditioning equipment designed to keep your fuel clean, compliant and ready. Our multi-stage fuel polishing systems continuously or periodically filter stored diesel, removing water, particulate and microbial contamination to keep fuel within recognised standards long after a tank has been cleaned. Alongside polishing, we supply fuel offloading units for safe, compliant deliveries, industrial filtration, transfer pumps, valves and flow detection equipment, so every stage of your fuel system, from tanker to tank to generator, is engineered for reliability.

Louise Hazel
Henry O’Lone
19+

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Case Study

Diesel Defence fuel polishing preserves power for Scottish islanders

A fuel cleaning operation identified thick layers of sludge at the bottom of SSE’s two 1,000,000-litre bulk storage tanks.

Frequently asked questions

Answers to the questions data centre operators ask us most about fuel quality, storage, HVO and monitoring.

Your standby generators are only as reliable as the fuel in their tanks. Contaminated diesel can block filters, cause start-up failures or shut a generator down partway through an outage. For a data centre, that can mean lost revenue, SLA penalties and lasting reputational damage. Keeping your fuel clean is one of the most effective and preventable ways to protect uptime

No. Diesel has a shelf life. In data centres, where generators run rarely and tanks have low turnover, fuel can degrade over months or years through water ingress, microbial growth and particulate build-up. The problem often stays hidden until a generator is needed.

A common recommendation is at least three days of fuel, so generators can run at full load through an extended outage. The right amount depends on your resilience requirements, tier rating and resupply arrangements. Larger fuel stores make fuel quality management even more important.

In many cases, yes. HVO (hydrotreated vegetable oil) is a renewable paraffinic diesel made to the EN15940 standard. Depending on how it’s produced, it can significantly reduce lifecycle carbon emissions compared with fossil diesel, and it’s often used as a direct replacement in diesel generators. Always confirm approval with your engine manufacturer first. HVO generally stores well, but tanks still need to be clean before you switch. Water and particulate can still get into a tank over time, so fuel quality management remains important. WASP can advise on the transition and support it with tank cleaning, fuel polishing and ongoing monitoring.

Fuel sampling and testing is the first step. Taking samples from different levels of the tank gives the most accurate picture of fuel condition. Inline particulate counters can then monitor contamination continuously and raise an alert if quality drops.

Yes. WASP’s cloud-based monitoring gives real-time visibility of fuel levels, fuel quality, flow and pump and filter status across single or multi-site estates. It supports remote control of polishing systems, data export for reporting, and alerts for poor-quality deliveries or irregular fuel draw, which also helps protect against fuel theft.

Yes. WASP is based in the UK and provides engineering support in more than 85 countries, with over 2,500 industrial power systems delivered. Our ISO 9001 and ISO 14001 certified processes ensure consistent quality across every site in your portfolio

Yes. Our equipment supports Modbus, BACnet and other fieldbus protocols, so fuel and fluid systems can connect into your existing building management and power management platforms.

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