RU165383U1 - FIRE RESISTANT FIBER OPTICAL CABLE - Google Patents

Abstract

Fire-resistant fiber-optic cable containing optical fiber, an optical module filled with a hydrophobic gel, armor made of high-strength galvanized steel wires, a sheath of polymer material, characterized in that the optical module is made of steel, the free space between the armor wires is filled with a hydrophobic gel, and the sheath is made from a halogen-free, low-smoke polymer composition ng (A) -FRHFLTx.

Description

The utility model relates to cable technology, namely, to the construction of optical cables intended for indoor and outdoor installation, taking into account the volume of combustible load of cables, in fire protection systems, as well as in other systems that must remain operational in a fire, for example, a power plant of all types, including nuclear, oil refineries, chemical enterprises, industrial and mining enterprises, oil and gas production and transportation, subways and nnel.

Known cable containing the outer polymer sheath and a steel optical module, inside of which is placed at least one optical fiber and a hydrophobic filler (Optical cable with a steel optical module "SaranskKabel-Optika". Link to the electronic catalog http://sarko.ru /index.php?option=com_content&task=view&id=63&Itemid=47).

The well-known "OPTICAL CABLE, NOT DISTRIBUTING COMBUSTION, FIRE-RESISTANT" according to the patent for PM No. 153285 (publ. 01/26/2015), containing multimode or single-mode optical fibers placed in tubes of polymeric material around a central force element, inner shell, armor and outer shell moreover, the inner shell is made of organosilicon material, partially filling the space between the tubes made of polycarbonate, and the outer shell is made of fireproof halogen-free material with an oxygen index of at least 27% and a specific heat of combustion, determined according to ISO 5660, not more than 16.5 MJ / kg.

A disadvantage of the known cable is the lack of resistance to prolonged exposure to elevated temperature, i.e. the inability to provide reliable communications in emergency situations due to the large percentage of combustible materials, the lack of resistance to UV radiation.

The proposed utility model solves the following problems:

1. The creation of fire-resistant fiber optic cable capable of transmitting a signal in a flame.

2. Significant expansion of the operating temperature range.

3. Improving resistance to mechanical stress.

4. Increased resistance to mechanical stress.

5. Reducing the amount of combustible materials in the structure.

6. Increase in fire retention time.

The technical result is achieved by the fact that in the inventive fire-resistant fiber-optic cable, a steel optical module is used for fire protection, which prevents the direct penetration of the flame and provides protection against possible mechanical influences during a fire, which allows the optical fiber inside the module to remain operational. The technical result is also achieved by the fact that the free space between the wires of the armor is filled with a hydrophobic gel, and the shell is made of a halogen-free, low-smoke polymer composition ng (A) -FRHFLTx with characteristics according to GOST 31565:

1. Combustion propagation limit (PRGP1b): the measured average length of the carbonized part of the sample from the lower edge of the burner is not more than 2.5 m.

2. The rate of smoke generation during combustion and decay of cable products (PD1): reduction in light transmission - not more than 40%.

3. An equivalent indicator of the toxicity of the products of combustion of the cable product (PTMP1): the ratio of the amount of the polymer material of the cable to the unit volume of the enclosed space in which the gaseous products formed during the combustion of the material cause the death of 50% of the experimental animals (with an exposure time of 1.5 hours) - more than 120 g / m ^3.

4. The indicator of corrosion activity of smoke and gas products during combustion and smoldering of polymeric materials of cable products (PKA1):

- gas content of halogen acids in terms of HLC - not more than 5 mg / g;

- the conductivity of the aqueous solution of the absorbed products of smoke and gas evolution is not more than 10 μS / mm;

- acid number (pH) - not less than 4.3.

5. The fire resistance index of the cable product (PO1): the time during which the cable remains operational under the influence of a flame is at least 180 minutes.

Fire-resistant fiber-optic cable is designed to transmit an information signal as part of fiber-optic communication lines, control and monitoring systems, as well as monitoring systems and is used in conditions where it is important to guarantee the operability of equipment, life support systems and evacuation in a fire. Fire-resistant fiber-optic cable is laid in the ground, including swamps and shallow non-navigable rivers, in cable ducts, pipes, trays, blocks, tunnels, sewers, on bridges and overpasses, between buildings and structures, inside buildings. Fire-resistant fiber-optic cable remains operational when exposed to a flame with a temperature of at least 750 ° C for 180 minutes.

Fire-resistant fiber-optic cable contains a Central steel optical module 1 with freely laid fibers 2. The free space in the optical module is filled with a hydrophobic gel. 3. The optical fibers 2 in module 1 are grouped in bundles (with the number of fibers more than 12). Each bundle of fibers has a winding colored synthetic thread. The central optical module 1 is spirally imposed armor 4 of steel wires. The free space between the wires is filled with a hydrophobic gel 3. A shell 5 of a polymer composition that does not propagate combustion, does not emit corrosive gaseous products during combustion and decay, with low toxicity of combustion products is applied to the armor. As the material for the outer shell can be used: polymer halogen-free compositions of reduced fire hazard, for example, ng (A) -FRHFLTx. The utility model is illustrated in the drawing.

In the manufacture of the cable using well-known materials manufactured on an industrial scale. The cable manufacturing technology includes the following operations: manufacturing a steel optical module 1 with free placement of optical fibers 2 in it. The free space in the optical module 1 is filled with a hydrophobic gel. 3. Armor 4 made of steel wires is helically superimposed on the central optical module 1. The free space between the wires is filled with a hydrophobic gel. A shell 5 of a polymer composition is superimposed on the armor 4

All operations are performed on standard equipment used for the manufacture of cables: the UniWEMA U5L longitudinal laser welding line (Nexans Deutschland GmbH), the CTRL 32 × 500 armor coating line (Construcciones Mecanicas Caballe sa), the OEL 60 extrusion line (Maillefer Extrusion OY) .

Operation parameters of fire-resistant flame-retardant fiber-optic cable (Table No. 1).

Design details are presented in table No. 2.

Characteristics of fire resistant fiber optic cable:

- maintains operability when exposed to a flame with a temperature of at least 750 ° C for 180 minutes;

- resistance to crushing loads (more than 1 kN / cm);

- resistance to UV radiation;

- ng (A) -FRHFLTx - the material of the outer shell (a polymer composition that does not spread combustion, does not emit corrosive gaseous products during combustion and decay, with low toxicity of combustion products);

- does not spread combustion during group installation (category A);

- low toxicity of combustion products;

- low optical density of smoke during smoldering (burning) - not more than 30%;

- the minimum amount of combustible materials in the structure;

- completely dielectric;

- resistance to shock not less than 20 J;

- resistance to the effects of molds and rodents.

Claims (1)

Fire-resistant fiber-optic cable containing optical fiber, an optical module filled with a hydrophobic gel, armor made of high-strength galvanized steel wires, a sheath of polymer material, characterized in that the optical module is made of steel, the free space between the armor wires is filled with a hydrophobic gel, and the sheath is made from a halogen-free, low-smoke polymer composition ng (A) -FRHFLTx.

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