Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
  • F16L59/00—Thermal insulation in general
  • F16L59/14—Arrangements for the insulation of pipes or pipe systems
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
  • F16L59/00—Thermal insulation in general
  • F16L59/14—Arrangements for the insulation of pipes or pipe systems
  • F16L59/145—Arrangements for the insulation of pipes or pipe systems providing fire-resistance
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/13—Hollow or container type article [e.g., tube, vase, etc.]
  • Y10T428/131—Glass, ceramic, or sintered, fused, fired, or calcined metal oxide or metal carbide containing [e.g., porcelain, brick, cement, etc.]
  • Y10T428/1314—Contains fabric, fiber particle, or filament made of glass, ceramic, or sintered, fused, fired, or calcined metal oxide, or metal carbide or other inorganic compound [e.g., fiber glass, mineral fiber, sand, etc.]
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/13—Hollow or container type article [e.g., tube, vase, etc.]
  • Y10T428/1352—Polymer or resin containing [i.e., natural or synthetic]
  • Y10T428/1372—Randomly noninterengaged or randomly contacting fibers, filaments, particles, or flakes

Definitions

• the invention relates to a fire resistant plastic pipe.
• the present restrictions on the use of plastic materials in flowline circuits in hazardous areas e.g. on board ships or on offshore platforms are imposed mainly because of the poor fire resistance of these materials relative to metallic materials.
• Object of the invention is to provide a plastic pipe of which the wall is protected against fire even if the pipe is exposed to fire during an extended period of time.
• this object is accomplished by a plastic pipe which is coated at the outer surface thereof with a thermal insulating layer comprising phenolic foam which layer is enclosed in an integrity retaining layer comprising fibres which fuse together upon exposure to fire thereby providing mechanical strength to the foam if the pipe is exposed to fire.
• the pipe shown in the drawing comprises two plastic pipe sections 1 and 2 joined by a socket and spigot joint 3.
• a major portion of the outer surface of each pipe section is coated with a continuous insulating layer 4 of phenolic foam.
• This layer 4 is overwrapped with an integrity retaining layer 5 of glassfibre reinforced epoxy.
• the pipe wall is surrounded by a series of phenolic foam blocks 6 which have been cut to shape to a series of complementary elements 6 to fill-up the gap between the adjacent continuous foam layers 4.
• the elements 6 are held in place by an overlay 7 of glassfibre reinforced epoxy, which overlay 7, together with the integrity retaining layers 5, forms a continuous layer of glassfibre reinforced epoxy surrounding the entire body of phenolic foam.
• Phenolic foam is generally regarded as a suitable thermal insulation for room temperature. Although phenolic foams do burn, they are inherently difficult to ignite and tend to carbonize slowly under the influence of direct flame, while emitting only very low levels of smoke.
• the present invention is at least partly based on the insight that if the tendency of phenolic foam to crack under the influence of flames can be suppressed, the foam is able to maintain its insulating properties in case of fire so that it can perform as a fire protective material. It was found that overwrapping the phenolic foam insulation layer with a glassfibre reinforced mastic enhanced the fire resistant properties of the foam to an unexpected large degree. Experiments revealed that after exposure to fire the glassfibre overwrapping had fused together to form a tough protective layer to the foam, which though charred, had retained a large proportion of its thermal and mechanical properties.
• an overwrap comprising fibres which fuse together upon exposure to fire is essential to retain the mechanical and thermal properties of the phenolic foam if the pipe is exposed to fire.
• the fibrous overwrap may contain other fibrous materials provided that upon exposure to fire at least some of the fibres fuse together and to the phenolic foam.
• Impregnating the fibrous overwrap with a mastic, such as an epoxy or phenolic resin, has the advantage that during normal operation of the pipe the foam is protected against occasional impacts. In case of fire the mastic will however rapidly burn away and it is the effect of the fusing fibres that provides mechanical strength to the foam.
• the plastic pipe itself may be made of any suitable synthetic material, such as an epoxy or polyester resin.
• the pipe wall may be reinforced by one or more layers of glassfibres.
• the fire resistant pipe thus fabricated is suitable for use in all tubular constructions where fire resistance is needed, such as in glassfibre reinforced plastic pipes having rectangular or circular shape or in large diameter pressure or storage vessels. Besides use of the pipe in ships or on offshore platforms, the pipe may also find application in onshore flowline circuits where fire resistance is required.

Landscapes

• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Thermal Insulation (AREA)
• Laminated Bodies (AREA)
• Rigid Pipes And Flexible Pipes (AREA)
• Organic Insulating Materials (AREA)
• Tubes (AREA)

Priority Applications (5)

Applications Claiming Priority (2)

Publications (1)

Family

ID=10595561

Family Applications (1)

Country Status (12)

Families Citing this family (15)

Citations (5)

Family Cites Families (13)

• 1986
  • 1986-04-02 GB GB868608055A patent/GB8608055D0/en active Pending
• 1987
  • 1987-02-09 US US07/012,929 patent/US4788090A/en not_active Expired - Fee Related
  • 1987-03-23 EP EP87902474A patent/EP0262203B1/en not_active Expired - Lifetime
  • 1987-03-23 KR KR1019870701125A patent/KR960004554B1/ko not_active Expired - Fee Related
  • 1987-03-23 JP JP62502355A patent/JPH0794877B2/ja not_active Expired - Lifetime
  • 1987-03-23 DE DE8787902474T patent/DE3775870D1/de not_active Expired - Lifetime
  • 1987-03-23 AT AT87902474T patent/ATE71446T1/de not_active IP Right Cessation
  • 1987-03-23 ES ES198787902474T patent/ES2030446T3/es not_active Expired - Lifetime
  • 1987-03-23 EP EP87200540A patent/EP0240072A1/en active Pending
  • 1987-03-23 WO PCT/EP1987/000171 patent/WO1987005985A1/en not_active Ceased
  • 1987-04-01 CA CA000533539A patent/CA1281662C/en not_active Expired - Fee Related
  • 1987-11-06 NO NO874631A patent/NO169742C/no unknown
• 1992
  • 1992-02-18 GR GR920400253T patent/GR3003831T3/el unknown

Patent Citations (5)

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