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Lambda F Flex Jacket

Lambda F Flex Jacket

Lambda F Flex Jacket

Lambda F Flex Jacket is a flexible system designed to protect vessels, pipelines, valves, flanges, actuators, control lines and boxes. It is fully tested to meet the most rigorous on- and offshore specifications for oil and gas installations.

Our Fire Jacket system is built up by a core of insulation material and stainless steel foil, enclosed by a custom-built silicone fabric. The pieces are joined with Velcro in the overlap and the system is secured with stainless steel bands, ensuring the integrity of the insulation properties.

The system has been tested successfully for blast overpressure at 1.2 bar, pool fire with a heat load of 200 kW/m² and jet fire with heat load up to 350 kW/m² (1350°C).

Most of the installations on the NCS have our Fire Jackets as part of their topside PFP system. We have also made deliveries to international projects like Kashagan (Kazakhstan), South Pars (Iran) and Nuclear Power Plants in Scandinavia. 

Fabrics used in all our flexible jacket systems have been tested for weather resistance in cooperation with DNV GL, and can also be equipped with a drain plug as required for top-side installations according to the NORSOK Standard. All seams are sewn with Kevlar thread and sealed with silicone, to avoid water ingress.

In addition to exceeding functional requirements, all Lambda products are designed for quick and easy removal and re-installation with a minimum use of personnel and tooling.

Design and Test results

The Bilfinger Lambda F Flex Jacket have been extensively tested and certified by DNV GL. The following test have been carried out:

  • Hydrocarbon fire to IMO Res. A.754(18), ISO 834-Part 3 / NS-EN 1363 Part 2
  • Jet-fire 250 kW/m2 to ISO 22899-Part 1, as well as
  • Jet-fire 350 kW/m2 to Extended OTI 95 634
  • Explosion tests have been conducted by Gexcon, The system has been successfully tested for blast overpressure at 1200 millibar (1.2 bar)
  • Weatherproofing test has been completed to 3x105 PA, according to Norsok R-004 and IACS UR S.14.2.3

The standard Jacket is produced with two layers of silicone cloth, insulated with 8-15mm Micotherm, with a layer of rustfree foil to provide protection against jet-fire erosion. The Heavy Duty (HD) Jacket has a similar design, with 30mm Microtherm insulation.

The Lambda F Flex Jackets are installed with a Velcro fastening strip, and tightly secured by steel bands. The steel bands are fitted through a fabric sleeves to protect the jacket fabric from damage.

Completed TestsResultsTest standardTest Institute Certification
Hydrocarbon fire - ability to withstand constant 1200°CUp to 120 minutesIMO Res. A.754(18)SP Fire Research AS (Sintef)DNV GL
Jetfire - 250kW/m² - equivalent to 0.3kg Propane / secondUp to 120 minutesISO 22899-Part 1SP Fire Research AS (Sintef)DNV GL
Jetfire - 350kW/m² - ability to withstand 1350°C jetfireUp to 60 minutesExtended OTI
95 634
SP Fire Research AS (Sintef)DNV GL
Explosion TestsUp to 1.2 barExplosion TestsGexconDNV GL
Weatherproofing TestPassedNorsok R-004 and IACS UR 2.14.2.3InternalDNV GL