FR2591715A1 - PROTECTIVE SHIELD AGAINST THE ACTION OF HEAT AND FIRE FROM OUTSIDE FOR A CORD-FORM PRODUCT - Google Patents

Abstract

at. Protective sheath against the action of heat and fire from the outside for a cord-like product. b. Protective sheath characterized in that it comprises a bandage with one or more layers, directly surrounding the product in the form of a cord and which is made of a non-organic material or which contains predominantly such a material, a tight winding is arranged on this bandage and consists of threads or bands of a temperature-resistant material, as well as a sheath surrounding this winding, acting as a compression sleeve, and made of a material resistant to heat and / or fire. vs. The invention relates to protective sheaths against the action of heat and fire from the outside for a bead-shaped product. (CF DRAWING IN BOPI)

Description

1.- Protective sheath against the action of heat and fire from

  from the outside for a shaped product

cord ".

______________

  The present invention relates to a sheath

  protection against the action of heat and fire

  firing from the outside for cord-shaped products, such as tubes in which fluids,

  hoses or a tube bundle target, and

  if an electrical cable and pipes for the

  pneumatic, hydraulic, electric or optical transmission

  than control pulses, measurement values, ec.o.

  Tubes through which fluids, hoses or tubing bundles pass, find uses in different fields of the art. Thus. for example, pipes

  flexible for high or very high pressure,

  also referred to as hydraulic cables, are

  used for actuations and training

  hydraulics, but they are just like the cables to

  tubes, also used as energy carriers.

  and information in the pneumatic or hy-

  control or control measuring hydraulics. Such pressure transmission cables are used everywhere where the electric transmission is not advantageous 2. - or is not allowed for safety reasons

(danger of explosion).

  In case of fire, or in case of a similar action of the heat on the flexible tubes, the tubes or the bundles of tubes used, one seeks in particular in the shipbuilding, but also in the chemical or petrochemical industry to maintain for a period of time as long as possible, the ability to operate flexible tubes or rigid pressure-stressed and in which pass fluids, to be able for example, in automatic installations

  with remote transmission, after detection of the above-mentioned

  able to cause damage,

  pneumatic or hydraulic lines

  necessary measurement and adjustment processes

For safety reasons.

  It is therefore also already known to use

  for the transmission of measurement values, impulse

  settings, etc., for example cables to

  tube rings with metal tubes resistant to

  heat, or to introduce the cable into

  tubes in metal tubes and equip them with

  ci of a suitable thermal insulation. Regardless of the high costs for such achievements, and also

  high costs for laying, these structures

  known conditions can not always be used for

technical reasons for laying.

  In the case of tube constructions with small tubes of thermoplastic synthetic material in which fluids circulate, it was also already known to use for the envelope a flame-retardant mixture of synthetic material. However, this one melts and flows for very high temperatures and can, in case of fire, release very quickly the rigid tube or the flexible tube in which circulates a fluid and 3.-

  expose these tubes directly to heat

  coming from the outside. A maintenance operation is not

so not got.

  But also in the technique of energy

  electrical engineering or in the transmission technology of

  data, the development of electrical cable or

  driver with improved fire behavior is a major problem. Materials for insulation

  or envelopes with flame retardant additions are generally

  known as the provision of fire resistant layers or heat in the construction of cables or conductors. The goal is always the same, namely

  to improve what is known as retention of

  which is to say to prolong the time during which

  relief scheme, for example to start the process

  above switching, can still be maintained. But

  that now, neither by the choice of materials, nor by modifications in the construction of cables or pipes, it has been possible to obtain improvements

  determinants of behavior in case of fire, abstractly

  made of the problems which necessarily arise to adapt to a mechanical problem a construction

  optimized cable or conductor for electrical purposes.

  cudgels. The object of the invention is therefore to find a possibility to protect also, under aggravated conditions of temperature, for example in case

  fire, such realizations of tubes,

  ples, of pipeline cables which consist of

  materials which are highly sensitive to heat or contain

  such materials, so that a maintenance of the func-

  be assured for a sufficient period of time

  long. These problems are particularly

  in all cases where, as for example in the case of high-pressure flexible hydraulic tubes, these flexible tubes are stressed in pressure, for example

at 100 bars and beyond.

  This goal is achieved in accordance with the

  In that the protective sheath has a single or multi-layer bandage which directly surrounds the cord-shaped product and is made of an inorganic material or which predominantly contains such a material, a tight winding. is disposed on the bandage and consists of wires or bands of a temperature-resistant material and a surrounding sheath

  this winding, playing the role of compression cuff-

  made of a heat-resistant material

  and / or fire. The particular advantages of this

  layer truction resides in that, for example, the soul in which the fluids or the cable passes, are certainly protected against the direct action of the temperature, that the layers disposed above already provide a

  uniform distribution of the heat field on the periphery

  and the length of the flexible tube, tube or target, whether by thermal radiation or conductivity

  thermal. This protection zone> in which we renounce

  this deliberately to materials decomposing at times

  high temperatures, receives compression or tightening

  extra thanks to a kind of compression cuff-

  if we. This has the consequence that the inner layers remain in their concentric position around the tube in

  flowing fluids, or around the cable of

  tube and around the electrical cable, even

  during the action of the heat and that they thus act

  across the periphery against> for example, the pressure

  sion of fluid prevailing inside the flexible tube or the rigid tube. The duration of use of a flexible tube,

  a rigid tube or a tube bundle cable, pro-

  tégé by a sheath made in accordance with the invention, is thus significantly increased despite pressures of 5.-

  operation in case of fire temperature.

  It is the same. for example, the drivers of a voltage-carrying power cable, who may even survive a fire when they are willing to

  inside a protective sheath according to the invention

  tion. A particularly advantageous embodiment of the invention is obtained when the sheath

  protection consists of a bandage surrounding

  the product in the form of a cord, this bandage being

  an inorganic material or containing

  such a material, the protective sheath

  further bearing a sheath covering this bandage and reflecting

  heat-radiating heat-exchanger, another heat-distributing heat-transfer-over sheath made of temperature-resistant material, and at least one weave covering said sheath and acting as a

  compression sleeve made of a resistant material

  both heat and / or fire, and an external protective outer shell of a fire-resistant or fire-resistant embodiment. Such an achievement

  for example in the case of hydraulic

  ples, at temperatures above 800 C

  service of more than 180 bars, the ability to

  for a sufficiently long period of time.

  According to a complement of the concept of the invention

  It has also proved advantageous that the

  inorganic layers directly surrounding the

  the rigid tube, the tube bundle cable or the electrical cable, or the pipe, are

  mica, in which case, on the one hand, to

  To improve the flexibility of the protective sleeve and, on the other hand, to increase the operational safety, this mica is arranged on a strip-shaped support. These

  bands, advantageously also in the individual layers.

  the different widths, are then wrapped around 6.-

  cord-shaped product, in a direction of applica-

  identical or different cation. The mica coating

  is then advantageously turned inward.

  It is also advantageous, according to a com-

  According to the invention, the heat-radiating layer consists of a glass silk band covered with metal. In this case, for example, it is possible to use two strips wound one after the other, in which case it is important, in particular, to obtain a closed screen against radiation.

  that the metal face of the band is turned towards the former

  interior, that is to say toward a possible source of heat.

  According to another concept of the invention, the heat-distributing sheath consists of one or

  several layers of yarn or fiber resistant to

  them and rolled tightly. These yarns or fibers which are made of ceramic or which may contain

  a similar material, and which are coated with metal, constitute

  thanks to this contribution of metal, a good

  heat dissipating and distributing it, but also in addition, because of the heat-resistant insulating core, a kind of thermal insulation in the direction of the

longiform product.

  All the layers mentioned hitherto and which surround the soul in which the fluid passes, are placed under the influence of an additional layer which, according to the embodiment of the invention, consists of a silk weave of glass. This sheath of heat-resistant material plays a sort of role of a compression sleeve for the layers placed underneath, especially in case of fire, when it is important for the protective sheath to maintain the

  running for a while.

  To make a protective sheath con-

  form of the invention, for example, it is possible to apply

  a process according to which, around the tube 7.- itself able to operate, around the flexible pipe, the cable bundle of tubes or the electric cable or the pipe, is first made a bandage with several layers with mica-coated strips, the mica being turned inwards, and over, is also rolled up, a metal-coated glass silk band with the coating facing outwards, this layer of band being tightly surrounded by metal-coated ceramic wires, while, on top, are

  reported, as a compression cuff, a woven

  wise in glass silk and finally an outer protective cover. This outer envelope, of a fire-resistant or fire-resistant embodiment, may be made of different materials. Thus, it is possible to use high-temperature-resistant materials based on fluoropolymer, possibly also in the form of sintered or unsintered strips. S4 for manufacturing reasons, materials that can be extruded must be used,

  preference for those with temperature resistance

  high levels. In this context, silicone rubbers

  cone have proved to be particularly suitable, for

  ple for waterproof wraps.

  Mica-coated tapes can

  tagently present from one layer to the other of the

  different gums, they are advantageously wound

  layer on layer with increasing width towards the ex-

  TER AL. The invention will be explained in more detail

  with the aid of an embodiment of a hydraulic tube

  that flexible pressure-resistant flame shown

  in Figure 1, as well as with diagrams of

  control for such a flexible tube described in tests

a and b.

  The high-pressure rubber tube 1, 8 of a type of construction known per se, is surrounded by the mica layer 2 or a material containing

  mica. Advantageously, strips 3 are used.

  mica green, for example glass silk-based strips, the mica coating being placed inwards. The reference 4 designates a winding consisting of one or more strips of glass silk, covered with aluminum, the metal layer acting as thermal protection being, consequently, placed outside. An additional sheath 5 distributing the

  heat is made of ceramic threads or fibers 6

  that, placed tightly around the winding 4.

  The glass silk weave 7 which may be a glass weaving band, particularly in case

  larger diameter, firmly surrounds the ceramic wires

  and simultaneously acts on layers 2 and 4 placed below. The outer envelope 8 is made of, for example, a flame retardant silicone rubber and is highly resistant to

tear.

  Despite the protective sheath formed in accordance with the invention of several layers, and

  long periods of use thus ensured in the event of

  In addition, the flexible hydraulic tube is sufficiently flexible and can also be mounted under reduced space. For the outer diameter of the pressurized flexible tube 1, for example 25 mm, and a layer of mica 2 8 mm thick, the outer diameter of the flexible tube protected according to the invention is not

  in fact increased to 55 mm.

  On a flexible hydraulic tube protected

  according to the invention, the following tests have been carried out:

test a -

  A flexible hydraulic tube made according to the

  Figure 1, was fixed above a tank filled with oil.

  In the same plane as the flexible tube 1, were arranged 9._ at intervals of 10 cm, five thermal probes 9 to 13,

  one of these thermal probes having been directly

  on the surface of the flexible tube on its side facing the oil tank. Two other thermal probes were placed in the flexible tube (probe 14) as well as between the

  flexible tube 1 and layer 2 (probe 15), the hydraulic tube

  that flexible being subjected to no pressure.

  After ignition of the oil, the temperature

  maximum of about 840 C is obtained after about 3 minutes.

  your. The fire of the heat source, consisting of a defined quantity of burning hydraulic oil, extinguishes after 15 minutes. The temperature measured in the flexible tube 1 by means of the probe 14, reached during the fire approximately 1100 C, the temperature measured with the

  probe 15 between the flexible tube 1 and the layer 2,

  kills at about 125 0C. Figure 2 shows the result

of this essay.

Test b -

  Unlike test a, three flexible hydraulic tubes protected according to the invention and made according to FIG. 1, are tested simultaneously; in addition, these flexible tubes are stressed for a test duration of 28 minutes at a static pressure of

bars.

  The result of this test is shown in FIG. 3. In this case, the temperature curves 9 to 12 represent the temperatures in the environment of the tubes, the curves T 16 to 18 show the evolution of the temperature of the fluid under pressure. in the three tubes

  flexible hydraulics used for the test.

  These tests show that the ability to

  of the flexible tube through which the fluid passes,

  below a protective sheath made in accordance with the invention is influenced only incidentally by the outside temperature. Despite the high pressure 10.-

  operating conditions at the same time as the temperature

  high temperature (fire), the flexible tube is not damaged.

  The invention is however not limited to

  this particularly critical case, because of the

  multi temperature of fire and internal pressure. Thus, it is also possible to protect, in accordance with the invention, any metallic or nonmetallic embodiment of tubular pipes or cables of bundles of tubes. In the same place as the flexible tube 1, any electrical or optical cable may be provided with a protective sheath which makes it possible to safely expose the cable to a fire without this cable being damaged or that the maintenance of its operation is implemented. question.

  It goes without saying that the maintenance of

  the integrity of the cable may, in addition, still

  be influenced, independently of the sheath of pro-

  according to the invention, by the clean construction of this cable, for example by the replacement of current insulating materials with fireproof materials or else

  of high temperature resistance.

11.-

Claims (20)

R E V E N D I C A T I 0 N S   1.- Protective sheath against the action of heat and fire from the outside for   products in the form of cords, such as tubes in the   fluids, hoses or a tube bundle cable, as well as an electrical cable and pipes for pneumatic transmission,   hydraulic, electrical or optical pulse   measuring sleeve, etc., protective sheath characterized in that it comprises a bandage with one or more layers, directly surrounding the cord-shaped product and which consists of an inorganic material or which contains a preponderant> a   such material, a tight winding is disposed on this bank.   made of yarns or strips made of a material   temperature-resistant, as well as a surrounding sheath   this winding, playing the role of compression cuff-   made of a heat-resistant material and / or fire.   2. Protective sheath according to the claim   tion 1, characterized by the simultaneous use of a   trimming directly surrounding the cord-shaped product and which is made of an inorganic material or which predominantly contains such a material, a sheath covering this bandage and reflecting (radiating)   the heat, a sheath brought on top and distributed   heat which consists of a temperature-resistant material, at least one weave covering this   sheath and acting as a compression cuff   with a material resistant to heat and / or fire,   as well as an external protective shell that is difficult to   flammable or fire-resistant.   3.- Protective sheath according to any one   Claims 1 or 2, characterized in that mica   is used as an inorganic material. 12.   4. Protective sheath according to the claim   3, characterized in that the mica is arranged on a tape-shaped support.   5.- Protective sheath according to any one   as in claims 1 to 4, characterized in that the   bandage consists of a multiple winding of the bandE supporting mica ..   6. Protective sheath according to the claim   5, characterized in that the mica coating is   respectively facing inwards.   7. Protective sheath according to the claim   2, characterized in that the sheath radiates the heat   consists of a glass silk band covered with te of metal.   8. Protective sheath according to the claim   7, characterized in that the metal layer of the tape is facing outside.   9.- Protective sheath according to any one   than claims 7 or 8, characterized in that the   metal covered band is rolled up.   10. Protective sheath according to the claim   7, characterized in that the layer radiating the chain   it is made of metal deposited in vacuum metallization.   11. Protective sheath according to the claim   2, characterized in that the heat-distributing sheath is made of one or more layers of heat resistant fiber yarns and clamped around the product.   12. Protective sheath according to the claim   11, characterized in that the fiber yarns are   made of ceramics or contain such and are coated with metal.   13.- Protective sheath according to any one   conque of claims 1 to 12, characterized in that   eI 25917i5 13.- the sheath playing the role of compression sleeve is   consisting of a glass silk weave.   14.- Protective sheath according to any one   as in claims 2 to 13, characterized in that   the extruded protective envelope consists of silicone rubber.   15.- Protective sheath according to any one   of claims 2 to 14, characterized in that   the protective envelope consists of a flame retardant elastomer or thermoplastic resin and resistant to temperature.   16.- Protective sheath according to one   conque of claims 2 to 15, characterized in that   that the protective envelope consists of an envelope by a strip of steel.   17.- Protective sheath according to one   conque of claims 2 to 16, characterized in that   the protective envelope is made of a material non-organic.   18.- Process for producing a sheath   protection device according to one of the claims   1 to 17, characterized in that, around the tube itself capable of functioning, around the flexible pipe, the bundled cable   tubes or electrical cable or can-   first, a multi-layer bandage with strips covered with mica, mica   being turned inward, and that above   worn, also by winding, a silk band of   metal coated glass with the coating facing out   this layer of tape being closely   metal coated ceramic wire, while   are reported as a compression cuff, a glass silk weave and finally an envelope external protection.   19.- Method according to claim 18, 14.-   characterized in that the mica-coated strips comprise   tentld! a layer to another of different widths.   20. A process according to claim 19, characterized in that the strips are wound on one another with a width increasing towards the outside.