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DF-SGR Mechanical Seal for Gas/Oil Multiphase


At 3.7 million tons a year, German production of crude oil covers about 3 percent of domestic demand. The largest recoverable reserves are located in Northern Germany. Compared to other oil & gas producing regions, extraction and refining in Germany tend to be more challenging. Highly optimized cutting-edge technology and processes, along with very sophisticated extraction and refining equipment, are needed to compete in the international marketplace.

The Problem

One oil producer in Northern Germany uses a Bornemann SLM twin-screw pump to transport an oil/gas mixture. This relatively compact pump has two mechanical seals. Originally, a competitor’s double seal with barrier fluid circulation system based on API Plan 54 was installed. However, this solution required a lot of maintenance, which caused high personnel involvement for maintenance and made things difficult for the company. As the pump system was located in a remote wooded area that was not easily accessible, the customer was seeking a solution to reduce maintenance effort to a minimum. Bornemann and EagleBurgmann were aware of the problem and a proposal was made to carry out a field test with a new EagleBurgmann sealing solution.

Oil rig in Northern Germany

Operating Conditions:

Medium: oil/gas mixture - 95 % gas content
Temperature: t = 50˚F (10 °C) suction side, 86˚F – 104˚F (30 °C - 40 °C) pressure side, at the seal
Pressure: p = 29 – 43.5 Psi (2 - 3 bar) suction side, 145 – 159.5 Psi (10 - 11 bar) discharge side, at the seal
Speed: n = 2,700 - 2,800 min-1
Seal incl. materials: DF-SGR1/55-E3, Q15Q15VGG (1.4571)
Seal type: single seal

The EagleBurgmann Solution

In 2008, the retrofit using an EagleBurgmann SGR seal with unpressurized quench and a DiamondFace coating was completed, and the customer saw a significant, sustained reduction in maintenance and monitoring activity.

  • Lowest possible coefficient of friction and heat generation, even when lubrication is insufficient
  • Maximum process reliability
  • Universal chemical resistance
  • Unbeatable protection against wear
  • Increased service life
  • Higher operating limits possible

When the radial shaft sealing ring (supplied by a competitor) on the pump failed in the middle of 2009, the system was checked over and EagleBurgmann suggested operating the seal without quench.

With the DiamondFace coating on the seal faces and 5 percent residual lubricating oil content in the medium, the seal has been running in the safe temperature range without leakage, and the customer is fully satisfied with the results.

For more information on EagleBurgmann DF-SGR seals, contact us at info.us@eagleburgmann.com.

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