RU2484865C2 - Fire prevention device of cassette type - Google Patents

Abstract

FIELD: fire-prevention facilities.

SUBSTANCE: device is designed for protection of tanks with petroleum products from penetrating the flame from outside, but they are beginning to be widely used for protection of different technological devices of the chemical industry as well. The fire prevention device of cassette type comprises a base and a cover, between which the fire prevention element of cassette type is located. The base and the cover are interconnected by the fasteners. The cover and the base are made in the form of support flanges in the form of truncated cones which are connected with expanding at the place of their connection. The fire prevention element is located on a fixing grid which is made in the form of mutually perpendicular rods. The grid is located in the upper part of the base, parallel to the support flanges. The rods are attached to the base and the cover by means of two elastic tapes contracted together by means of fastening elements which are tightened together by means of fasteners. The fire prevention device is made of corrugated and flat metal strips, tightly twisted in a roll in such a way that vertical narrow channels are formed there through which the inflammable mixture flows freely. The corrugation can be triangular, rectangular, square, trapezoidal, sinusoidal, and formed by circular arcs.

EFFECT: increased efficiency of fire suppression.

4 cl, 5 dwg

Description

Fire arresters are designed to be installed on equipment: on pipes for the discharge of combustible gases into the atmosphere or on a torch (waste fire arresters); on inter-equipment and inter-workshop communications (communication fire arresters) and in front of the burners. They are also intended to protect reservoirs with petroleum products from flame penetration from the outside, but they are beginning to be widely used to protect various technological apparatuses of the chemical industry.

Known flame arrester (AS USSR No. 58888 - prototype), comprising a housing made of a base and a lid, between which a cassette-type flame arrestor is located.

A disadvantage of the known technical solution is the relatively low efficiency of flame suppression due to the fact that the combustible mixture freely passes through narrow channels and the flame can spread to the entire height of the flame retardant elements.

EFFECT: increased flame suppression efficiency.

This is achieved by the fact that in a cassette fire arrester comprising a housing made of a base and a lid, between which a cassette-type fire arresting element is located, the base and the lid are interconnected by at least three fasteners, the lid and the base being made in the form of support flanges connected with truncated cones, expanding to the place of their connection, and the flame retardant element is located on a fixing grid made in the form of mutually perpendicular rods located in the upper part of the base, parallel to the supporting flanges, and attached to the base and the cover by means of two elastic bands, tightened together by means of fasteners, while it is made of corrugated and flat metal bands tightly twisted into a roll so that it forms vertical narrow channels through which the combustible mixture freely passes, while the corrugation can be triangular, rectangular, square, trapezoidal, sinusoidal, and formed by arcs of circles.

In Fig.1 shows a diagram of a cassette type fire arrester, in Fig.2 is a top view of the fire retardant element, in Fig.3-5 are embodiments of the fire retardant element (remote elements).

Cassette type flame arrester (Fig.1-2) consists of a housing made of base 2 and cover 1, interconnected by at least three fasteners 3. Moreover, the cover with the base is made in the form of supporting flanges connected to truncated cones expanding towards the junction. Between the base 2 and the cover 1 there is a fire-blocking element 4 of the cassette type, which is located on the fixing grid 5, made in the form of mutually perpendicular rods located in the upper part of the base 2, parallel to the supporting flanges of the base 2 and cover 1.

The flame retardant cassette 4 is quick-detachable and is attached to the base and cover by means of two elastic bands 6, which are pulled together by means of fasteners 7.

The flame retardant cassette 4 is made of corrugated 9 and flat 8 metal tapes (Fig. 3), tightly twisted into a roll so that it forms vertical narrow channels through which the combustible mixture freely passes, and the flame cannot propagate. In this case, the corrugation can be triangular, rectangular, square, trapezoidal, sinusoidal, and formed by arcs of circles.

An embodiment of the flame retardant element 4 is possible when perforated tape 10 is located between the corrugated tapes 9, which allows to increase the throughput of the combustible mixture when suppressing the flame. A possible embodiment with alternating solid 8 and perforated 10 metal tapes.

Flame retardant cassette 4 can be made of corrugated tape 9 and a less rigid flat metal mesh 11 (Fig. 4), located with a bend between the corrugations of tape 9, tightly twisted into a roll with the formation of vertical narrow channels, inside which there is an additional flame arrester in the form of a grid 11 . It is possible to alternate a flat metal strip 8 and mesh 11.

The flame retardant cassette 4 can be made of corrugated 9 and flat 8 metal tapes (Fig. 5), tightly twisted into a roll so that vertical narrow channels are formed in it, in which alternate flame arresters are arranged in the form of mesh or porous cylindrical bodies 12 or spherical shape.

The cartridge-type fire arrester operates as follows.

The flame retardant cassette 4 is made of corrugated 9 and flat 8 metal tapes (Fig. 3), tightly twisted into a roll so that it forms vertical narrow channels through which the combustible mixture freely passes, and the flame cannot propagate.

Flame retardant cassette 4 is made of aluminum foil with a thickness of 0.30 ÷ 0.47 mm To do this, first get a corrugated tape, passing the strip through two rotating rollers with teeth. Then, to form a fire-retardant cartridge, the corrugated tape is laid on a flat one, both are inserted into the slot of a steel rod and spirally wound on it. Moreover, the cross section of the channels formed by the corrugated tape has a triangular shape with the base of the triangle 3.9 ÷ 4 mm and a height of 1.15 ÷ 1.25 mm. The overall dimensions of the proposed fire arresters and their throughput are in the following optimal dependence with the conditional pass:

Conditional pass, mm Throughput capacity. M ³ / h Overall dimensions, mm one hundred 25 ÷ 100 230 × 212 × 212 150 100 ÷ 215 240 × 282 × 282 200 215 ÷ 380 250 × 362 × 362 250 380 ÷ 600 280 × 438 × 438 350 600 ÷ 800 322 × 625 × 625

On tanks with flammable liquids, cassette fire arresters are often installed in series with breathing and safety valves to prevent flame from entering the tank.

Claims (4)

1. Flame retardant cartridge cassette containing a housing made of a base and a cover, between which is located a flame retardant element of a cassette type, characterized in that the base and the cover are interconnected by at least three fasteners, and the cover with the base is made in the form supporting flanges connected to truncated cones expanding to the place of their connection, and the flame retardant element is located on a fixing grid made in the form of mutually perpendicular rods in the upper part of the base, parallel to the supporting flanges, and attached to the base and the cover by means of two elastic bands, tightened together by means of fasteners, while it is made of corrugated and flat metal bands tightly twisted into a roll so that it forms narrow vertical channels through which the combustible mixture freely passes, while the corrugation can be triangular, rectangular, square, trapezoidal, sinusoidal and formed by arcs of circles. 2. The cartridge-type fire arrester according to claim 1, characterized in that between the corrugated tapes of the fire-retardant element there is a perforated tape with alternating continuous and perforated metal tapes. 3. The cartridge-type fire arrester according to claim 1, characterized in that the fire-retardant element is made of corrugated tape and a less rigid flat metal mesh, located with a bend between the corrugations of the corrugated tape, tightly twisted into a roll with the formation of vertical narrow channels, inside which there is an additional flame arrester in the form of a metal mesh, while it is possible to alternate a flat metal ribbon and mesh. 4. The cartridge-type fire arrester according to claim 1, characterized in that the fire-retardant element is made of corrugated and flat metal bands tightly twisted into a roll so that it forms vertical narrow channels in which additional flame arresters are arranged alternately in the form of mesh or porous bodies of cylindrical or spherical shape.

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