Diesel Fuel: How Critical for your Standby Power?

Data center downtime is a familiar topic in the industry; however avoiding down time through proactive fuel management is not common knowledge in the field despite an emerging relevance. A vast majority of data centers use diesel to supply their backup power systems.

Historically diesel could be stored for extended periods at a time and function smoothly when needed. Unfortunately, this is no longer the case. The environmental burden of diesel has been reduced by government mandates reducing the sulphur content of diesel and introducing bio-diesel blends. However, in doing so, the need to manage stored diesel has surfaced.


Changes in Diesel

The process to remove sulphur in diesel can affect the functionality of the fuel, to compensate, refiners include additives. Some of these additives, such as certain forms of lubricants, de-icers and bio-diesel itself increase the ability of the fuel to absorb water.


Effects on Your Generator

Water in diesel causes problems and subsequently leads to diesel generators either not kicking in, or failing mid-operation, when standby power is needed in emergency backup situations. It will be a disaster situation when data centers and other critical facilities, such as hospitals, faced severe down time as a result of backup generators not functioning as expected.


Fuel Management: Fuel Testing

A comprehensive fuel management strategy begins with knowing what type of fuel you have, and the state it is being stored in. Research into bio-diesel mandates in your area and perform regular onsite and offsite testing to see the bio-diesel, water and microbial contamination of your fuel (microbial growth is a sign that troubles lie ahead).


Fuel Management: Fuel Polishing

According to Polaris Laboratories, “in systems prone to water contamination,” (such as fuel storage tanks) “it is imperative that the contaminated oil be able to shed water, or demulsify in order to maintain lubricity, viscosity and prevent the formation of acids.”


To begin creating a fuel management protocol, evaluate the tank, piping and generator set up to highlight areas of weakness; consider the impact of likely site temperature and humidity ranges.


The Uptime Institute’s technical paper, titled Biodiesel, suggests finding a fuel polishing system utilizing coalescing filters which have been proven to remove water suspended within the fuel (emulsified water). An automated fuel polishing system is recommended; continuously remove water and particulates, ensuring emergency ready fuel all the time.




About The Blogger


Strategic Media Asia (SMA, www.stmedia-asia.com) is a leading technical training and event organizer for corporations specialized in data center design & build, E&M facilities, telecom, ICT, finance and colocation. Currently, SMA delivers a series of data center trainings and qualification programs in Hong Kong, Taiwan and Macau.

All these events / training seminars are designed to support the leadership needs of senior executives (Chief Information Officers, IT Directors / Managers, Facilities Managers, company decision makers, etc.) and to provide useful and applicable knowledge.

For detail, please visit our data center courses & training seminars at http://www.stmedia-asia.com/trainings.html.

Generators: Key to Improve Reliability (7 x 24)

When it comes to reliability, diesel generators are far and away the most important facility in a data center, and regulatory mandates on fuel may be creating new problems that could raise generator failure rates. Reducing its failures has more than 10 times the impact of reducing other component rates.

There are three key threats to generator reliability – fuel quality problems due to old fuel mixing with newer fuel; quality issues with new Ultra-Low Sulphur Diesel and bio-diesel fuels; and wear and tear from efforts to start cold generators as quickly as possible.


Fuel Tanks and Mixing Diesel

The leading problem with generators is not the failure to start, but the failure to run properly once the generator has started. One of the key factors is fuel quality: mixing small amounts of older diesel remains in the bottom of a tank with newer diesel when it is refilled.


Ultra-Low Sulphur Diesel

Another factor is the regulatory requirement to use Ultra Low-Sulphur Diesel Fuel (ULSD). While ULSD improves the emissions profile of generators, it is less stable than older distillate diesel fuels with a maximum storage time of 6 months. Even if stabilizers are added to extend the storage time, this could result in a higher incidence of accelerated wear on seals.


There are four recommendations on managing the challenge:

(1) Empty and inspect fuel tanks whenever possible (with a good maintenance & operation scheme).

(2) Refine your generator testing policies. Test them as you will run them and the tests should run for 24 to 72 hours to simulate an extended utility outage, which will draw down diesel supplies in ways not seen in shorter periods.

(3) Sample your diesel fuel on a regular basis to track fuel quality.

(4) Make sure you have better connections and agreement with more than one fuel companies so they provide high quality diesel fuel and assistance within a short period of time (say within 2 - 3 hours).

About The Blogger

Strategic Media Asia (SMA, www.stmedia-asia.com) is a leading technical training and event organizer for corporations specialized in data center design & build, E&M facilities, telecom, ICT, finance and colocation. Currently, SMA delivers a series of data center trainings and qualification programs in Hong Kong, Taiwan and Macau.

All these events / training seminars are designed to support the leadership needs of senior executives (Chief Information Officers, IT Directors / Managers, Facilities Managers, company decision makers, etc.) and to provide useful and applicable knowledge.

For detail, please visit SMA's Technical Training Seminars & Data Center Qualification Programs.