Up to 10 times longer running times with the new anti-sticking pump elements from L’Orange

Deposits in the barrel can significantly impede the pump’s operation. Common measures such as the regular cleaning of the pump element are very time-consuming and far from ideal over the long run. L’Orange is committed to a sustainable solution to this problem. A new pump element with a special coating and a scraper ring can largely reduce the formation of lacquering and therefore increases the running times of pumps by four to ten times.

Lacquering is partly attributable to an incompatibility between fuel and lubricating oil – especially due to the low TBN (Total Base Number) of the engine oil. The TBN value describes the size of the so-called alkaline reserve of a motor oil. With its basic property, this serves to neutralize the fuel’s harmful acids.

Due to the capillary effect – reinforced by the additional stroke movement of the plunger – the lubricating oil rises up on the plunger and mixes with the fuel. This results in lacquering in the barrel as well as in the grooves. The clearance between plunger and barrel is reduced, which ultimately leads to plunger sticking. Other influencing factors are: the mixture incompatibility of different fuels (e.g. between HFO: Heavy Fuel Oil and MDO: Marine Diesel Oil/MGO: Marine Gas Oil), fuel temperatures of over 150°C in the pump element, too fast switching between the fuels, contamination with metal traces or the admixture of lubricating oils to HFO.

The common measures by which the operator can reduce the formation of lacquering are often time-consuming or not effective enough. This includes moving the control rack with the engine switched off, the elaborate cleaning of the pump elements, and the adherence to the permissible fuel viscosities and temperatures as per the OEM provision.

The innovative solution: the new anti-sticking pump elements from L’Orange.

With the new anti-sticking pump elements, it is possible to significantly reduce the formation of lacquering and therefore sustainably lower the risk of plunger sticking. For this purpose, L’Orange optimized the pump elements in terms of geometry, surface coating and scraper ring. Lubricating oil and fuel are separated which eliminates the main cause of the formation of lacquering. The scraper ring serves as protection if lacquering occurs in spite of the separation between lubrication oil and fuel. It effectively scrapes the lacquering off the barrel therefore preventing any increase in the lacquering layer in the barrel. The new special coating and the microgrooves do not allow the lacquering to even develop on the plunger. The innovative total solution extends the running time by four to ten times compared to standard products.

Product image:








Cross-section: L’Orange anti-sticking pump elements

L’Orange anti-sticking pump elements have several advantages:

  • Less lacquering mean longer service intervals and reduced service costs.
  • The hydraulic properties of the new anti-sticking pump elements correspond exactly to those of the previous series pumps.
  • The new L’Orange anti-sticking pump elements have already been used successfully in various applications. Anti-sticking pump elements are currently available for the following systems: 16/24 IMO II, 21/31 IMO I, 21/31 IMO II and 32/40 CD IMO I,

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 About L’Orange

L’Orange, a Rolls-Royce Power Systems AG company, has developed, produced and sold advanced injection systems worldwide for large engines from 1,000 to 40,000 kW for more than 80 years. The company, with its long tradition, currently employs over 1,000 people at its locations in Germany, USA and China. L’Orange’s service spectrum encompasses the entire product range in injection technology, including state-of-the-art common-rail technology for all off-highway diesel and heavy fuel oil applications.

Successful engine manufacturers worldwide count on L’Orange products. The company’s international customers are specialized in the areas of commercial shipping, yachts, power plants, railways and heavy vehicles. One of L’Orange’s key strengths is the realization of highly customized system solutions targeted to its customers’ specific requirements. With a worldwide dealer and supplier network, L’Orange is always close to its end-customers.

About Rolls-Royce Holdings plc

1.        Royce’s vision is to be the market-leader in high performance power systems where our engineering expertise, global reach and deep industry knowledge deliver outstanding customer relationships and solutions. We operate across five businesses: Civil Aerospace, Defence Aerospace, Marine, Nuclear and Power Systems.

2.        Rolls-Royce Power Systems is headquartered in Friedrichshafen in southern Germany and employs around 10,000 people. The product portfolio includes MTU-brand high-speed engines and propulsion systems for ships, power generation, heavy land, rail and defence vehicles and for the oil and gas industry. Under the MTU Onsite Energy brand, the company markets diesel gensets for emergency, base load and peak load applications as well as cogeneration plants using gas engines for the combined generation of heat and power. Bergen medium-speed engines power ships and power generation applications. L’Orange completes the portfolio with fuel injection systems for large engines.

3.        Rolls-Royce has customers in more than 150 countries, comprising more than 400 airlines and leasing customers, 160 armed forces, 4,000 marine customers including 70 navies, and more than 5,000 power and nuclear customers.

4.        We have three common themes across all our businesses:

·  Investing in and developing engineering excellence.

·  Driving a manufacturing and supply chain transformation which will embed operational excellence in lean, lower-cost facilities and processes.

·  Leveraging our installed base, product knowledge and engineering capabilities to provide customers with outstanding service through which we can capture aftermarket value long into the future.

5.        Annual underlying revenue was £13.8 billion in 2016, around half of which came from the provision of aftermarket services. The firm and announced order book stood at £80 billion at the end of 2016.

6.        In 2016, Rolls-Royce invested £1.3 billion on research and development. We also support a global network of 31 University Technology Centres, which position Rolls-Royce engineers at the forefront of scientific research.

7.        Rolls-Royce employs 50,000 people in more than 46 countries. More than 16,000 of these are engineers.

8.        The Group has a strong commitment to apprentice and graduate recruitment and to further developing employee skills. In 2015 we employed 228 graduates and 277 apprentices through our worldwide training programmes.




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Mike Godfrey, Image Line Communications Ltd.

(t) +44 (0)20 7689 9009
(e) mike@imageline.co.uk