KR102459452B1 - Flame arrester block for a protection device against the propagation of flames - Google Patents

Abstract

at least one first plate 305 having an external perimeter and at least one aperture in an area inside the external perimeter; and
A closure second plate 310 stacked on the at least one first plate 305 in a stacking direction (X), spaced apart from the at least one first plate 305 (315), and the at least one a second plate (310) for closing, causing a gap to be formed between the first plate (305) and the second plate (310) transverse to the stacking direction (X); flame and/or explosion, including; A flame arrester block 230; 230-1, 230-2, 230-3, 230-4; 230-5;

Description

FLAME ARRESTER BLOCK FOR A PROTECTION DEVICE AGAINST THE PROPAGATION OF FLAMES

The present invention relates to a device for protection against propagation of a flame in the presence of an explosion and/or detonation caused by any source of ignition. Such protection devices are also known as flame arresters. In particular, the present invention relates to a flame arrester block for use in such a protection device.

A flame arrester is a device aimed at extinguishing flame propagation in the presence of a detonation or deflagration, eg resulting from any ignition.

Flame arresters are used as protective devices in a variety of applications, for example in the petrochemical, chemical, pharmaceutical, and more generally potentially explosive fields.

A flame arrester is a device that prevents the propagation of a flame while allowing the passage of a fluid (liquid or gas).

The principle of operation underlying the flame arrester is the extinguishing of combustion by heat transfer from the flame to a body of low-temperature, thermally conductive solid material ("fire quenching" or "combustion quenching"). )to be. This heat transfer is more efficient when the body of solid material has a number of narrow passages through which the flame passes.

One type of flame arrester commonly used is what is referred to as a "Crimped Metal Ribbon (CMR)". A CMR flame arrester comprises one or more flame arrester elements, each of which consists of alternating layers of a smooth thin metal sheet and a corrugated thin metal sheet, for example a central The central mandrel and the central mandrel are disposed coaxially to form a multi-layered cylindrical body, the entirety of which is configured to be enclosed within a single outer jacket. The spaces formed between the corrugations of the corrugated metal sheet and the adjacent smooth metal sheet form a plurality of passages or channels for the fluid. Such passages, for example passages having an approximately triangular cross section, extend generally parallel to the axis of the cylindrical body (or extend with a limited angle of inclination with respect to the axis of the cylindrical body).

WO 94/00197 discloses an example of a CMR flame arrester.

In a typical process for the fabrication of CMR flame arresting elements, two smooth metal sheets are drawn from separate reels, one of the two metal sheets is crimped by a toothed wheel, and then the center A step of spirally wrapping the two metal sheets on a mandrel is necessary.

In the case of CMR flame arresters, one or more flame arresters are usually arranged in axial succession with a spacing element arranged between them for generating turbulence, which increases the heat exchange efficiency and thus the number of flame arresters. This is to ensure that the flame stops without increasing the

Applicants have discovered several drawbacks despite the common use of CMR flame arresters.

For example, CMR flame arresters can be easily damaged during handling, such as during maintenance operations, particularly. The damage can change the size of the passageway of the fluid, which has the very dangerous result that it becomes impossible to stop flame propagation, or causes misalignment of the metal sheets, resulting in increased pressure drop. may cause

Also, because the size of the passage or channels of the fluid is very small, the passages can be easily clogged by deposits, which requires periodic maintenance of the flame arrester.

Furthermore, CMR flame arresters are accompanied by a significant pressure drop. The pressure drop depends on the internal structure of the CMR flame arrester, i.e. the number of flame arresters, the cell size of the flame arresters (the height or “gap” of a passageway or channel for a fluid), the height of the flame arresters, and the flame arrester. This is due to the inclination of the passages or channels of the elements and the thickness of the metal sheets making up the flame arresting elements. This pressure drop is determined as a function of flow rate, type of fluid, and condition of the fluid, and increases in magnitude when the flame arrestor becomes dirty and becomes obstructed in the passage or channels. The dirt can be greatly increased by the fluid containing impurities and the sticky fluid.

Another disadvantage of the CMR flame arrester is that the structure is relatively complex due to the relatively large number of various parts (central mandrel, smooth metal sheet, corrugated metal sheet, outer jacket) that make up the CMR flame arrester, which It requires a specific manufacturing process using automatic or semi-automated machines of the company, making assembly quite complex. All of these factors make the cost of CMR flame arresters quite high. Another disadvantage due to the complexity of the structure of the CMR flame arrester is that the CMR flame arrester cannot be completely disassembled for cleaning once it is assembled, which makes it virtually impossible to reassemble the CMR flame arrester to ensure initial structural stability. Because it is impossible. Cleaning has to rely on the use of solvent or high-pressure jets (which are the only means of penetrating into the grid of a CMR flame arrester), which is cumbersome, time-consuming, and often not entirely effective.

In addition, it is essential that the flame arrestor element be robust against deformation and warping and be able to be produced with high precision and repeatability. It is not easy to achieve low ovalization of flame arresting elements (determined by spirally winding metal sheets on a central mandrel).

The Applicant aims to solve the above and other disadvantages of the prior art.

According to the invention there is provided a flame arrester block for use in a protection device against the propagation of flames resulting from an explosion or detonation.

The flame retardant block is:

at least one first plate having an external perimeter and at least one aperture in an area inside the external perimeter; and

A closure second plate stacked along a stacking direction on the at least one first plate, spaced apart from the at least one first plate, between the at least one first plate and a second plate in the stacking direction and a second plate for closing, allowing a gap in the transverse direction to be formed.

Preferably, the second plate is spaced apart from the first plate by at least one spacer.

The at least one first plate may include a plurality of first plates stacked on each other in the stacking direction, and the first plates are spaced apart from each other by individual spacers so that a plurality of first plates are disposed between adjacent pairs of the plurality of first plates. gap is formed.

Said first plate is in particular a rectangular frame, such as a square or rectangular or rhomboidal frame, an oval frame, a star-shaped frame, a frame with lobes, or (eg an o-pan ( o fan) may have the form of an annular frame) with an annular shape.

Preferably, the second plate may have a shape corresponding to the shape of the first plate, in particular, a disk shape or a rectangular shape.

The at least one spacer may be a washer.

The at least one spacer may be a thick portion of the material of the first plate and/or the second plate.

Preferably said at least one first plate and said second plate are clamped and tightened to form a bundle.

Also provided is a fire and/or explosion protection device according to the present invention, wherein the protection device includes at least one of the above-described flame protection blocks.

The protection device includes an end-of-line protection device, an in-line protection device, an overpressure valve for protection against propagation of flames in the presence of deflagration or detonation. valve) (a relief valve or a vent valve), an underpressure valve (or a vacuum valve), and a breather valve.

The protection device may include two flame arresting blocks disposed opposite to each other with a facing second plate for closing, wherein the two flame protection blocks provide a bidirectional protection against flame propagation and a fluid flow in both directions. It is housed in a jacket to enable flow.

The protection device may comprise at least a first flame arresting block and a second flame arresting block arranged concentrically.

The protection device is:

- for use for class IIA fluids according to the ISO 16852 standard, comprising 20 first plates having a thickness of 1 mm and an outer diameter of 15 mm and spaced apart from each other by a distance of 0.5 mm;

- for use for class IIB fluids according to the ISO 16852 standard, comprising 20 first plates having a thickness of 1 mm and an outer diameter of 20 mm and spaced apart from each other by a distance of 0.3 mm;

- for use for class IIC fluids according to the ISO 16852 standard, it may comprise 15 first plates with a thickness of 1.5 mm and an outer diameter of 25 mm and spaced apart from each other by a distance of 0.15 mm.

Applicants have found that such a structure is suitable for making a protective device conforming to "endurance combustion".

The flame arrester block according to the present invention is simple to manufacture, assemble and install (because it is already commercially available or consists of few component parts with a simple structure), and therefore requires low cost.

In addition, the flame arrester according to the present invention is not only easy to disassemble and reassemble, but also easy to maintain because it can be cleaned by an ordinary abrasive system and does not have to rely on the use of solvents or high-pressure steam. .

Another significant advantage of the flame arrester block according to the invention is that it has modularity: in fact, by increasing the number of stacked (and mutually spaced) plates, the performance of the ability to stop flame propagation is reduced. It is possible to reduce the pressure drop substantially as intended without

The above features and advantages of the present invention will become more apparent by the following detailed description of possible embodiments which illustrate but not limit the invention, which description refers to the accompanying drawings in which:
1 shows a schematic diagram of one possible application of a flame arrester block according to an embodiment of the invention;
2 shows a partial cross-sectional view of an end-of-line protection device with a flame arrester block according to an embodiment of the present invention;
Fig. 3a shows a detailed cross-sectional view of the flame arrester block of Fig. 2;
Fig. 3b shows a detailed cross-sectional view of an alternative embodiment of the line-ended protection device of Fig. 2 with two nested flame arresting blocks;
4 and 5 respectively show a bottom view from below of a portion of the flame arrester block of FIG. 2 and a cross-sectional view taken in the plane indicated by the line VV in FIG. 4 ;
FIG. 6 shows an enlarged detail of FIG. 5 ;
7 shows the application of a flame arrester block according to an embodiment of the invention to a breather valve for, for example, a tank of petroleum or its derivatives;
8 shows a cross-section of an embodiment of an in-line protection device with a flame arrester block according to an embodiment of the present invention;
9 shows a cross-section of another embodiment of an in-line type protection device with a flame arrester block according to an embodiment of the present invention;
10 is a cross-sectional view of another embodiment of an in-line protection device with a flame arrester block according to an embodiment of the present invention.

Referring to the drawings, in FIG. 1 one possible application of a flame arrester block according to an embodiment of the invention is schematically illustrated.

Reference number 105 refers to a storage tank, for example a tank of a petrochemical plant (or chemical plant, pharmaceutical plant, etc.). The tank 105 is intended to contain a flammable liquid 110 which discharges a vapor 115 as, for example, oil, or a liquid obtained from petroleum refining.

The tank 105 is provided with a vent duct 125 for exhausting the internally generated combustible vapor 115 . A line-ended protection device 130 is mounted at the end of the vent duct 125 , for example by an explosion triggered by an electrical discharge, such as a meteorological event such as lightning 135 from a storm. A flame arrester block is provided that stops potential flame propagation within the reservoir 105 and along the vent duct 125 in the event of a deflagration that triggers combustion of the combustible vapor 115 . The line-end type protection device 130 is preferably provided with a rainwater cover 140 .

FIG. 2, partially shown in cross section, shows the end-of-line protection device 130 of FIG. 1 according to an embodiment of the present invention. 3A is a detailed cross-sectional view of the flame arrester provided in the line-ended protection device 130 of FIG. 2 , and FIGS. 4, 5, and 6 are respectively a bottom view of the flame arrester block, taken along the line V-V in FIG. A cross-sectional view taken in the indicated plane, and a detailed view are shown.

The line-ended protection device 130 of the embodiment of FIG. 2 comprises a hollow body 205 comprising a first end flange 210 for mounting, for example, to a vent duct 125 shown in FIG. 1 . do. The hollow body 205 has a first portion 215 , eg substantially cylindrical, starting at a first end flange 210 , eg conical and terminating at a second end flange 225 . and a second portion 220 .

A flame arrester block 230 is mounted on the second end flange 225 . In this embodiment, the rainwater cover 235 is mounted on the flame arrester block 230 (however, as described below, the rainwater cover 235 is not essential due to the structure of the flame arrestor block of the present invention).

The flame arrester block 230 comprises a plurality of plates 305, which are formed, for example, as a sheet of metal, preferably made of carbon steel, stainless steel, or special steel, for example For example, it has the shape of a circular crown (ring) stacked along the longitudinal axis (X) of the line-terminated protective device (130) corresponding to the axis of the inner hole of the hollow body (205). Preferably, the annular plates 305 have equal inner and outer diameters. For example, the inner diameter of the annular plate 305 may correspond to the inner diameter of the second end flange 225 . The outer diameter of the annular plate 305 may correspond to the outer diameter of the second end flange 225 .

As shown above (according to the orientation shown in FIG. 2 ), the flame arrester block 230 is a discoid (ie, circular) shaped closure having a diameter preferably equal to the outer diameter of the annular plates 305 . It is closed by a plate 310 . The disk-shaped plate 310 may also be formed of, preferably, a metal sheet made of carbon steel, stainless steel, or special steel.

The ring-shaped plates 305 and the disc-shaped closure plate 310 can be clamped and tightened to form a pack, in which case spacers 315, such as washers, for example. Appropriate spacing can be maintained. To form a bundle by clamping the annular plate 305 and the disc-shaped closure plate 310 with the individual spacers 315 interposed therebetween, a bolt 320 (as illustrated in this embodiment) or Tie rods 405 may be used, which are inserted into circumferentially continuous and correspondingly formed through-holes, the through-holes being near the periphery of the disc-shaped closure plate 310, the annular plate formed near the outer perimeter of the 305 and advantageously on the second end flange 225 .

A rainwater cover 235 may be mounted on the disk-shaped closing plate 310 , which preferably has a larger diameter than the diameter of the flame arrester block 230 , that is, the outside of the annular plate 305 . An element that is larger than a diameter and has substantially the shape of a cap. For the assembly of the rainwater cover 235 (if provided), the same tie already used for clamping the spacers 315 and the plates 305 , 310 forming the flame protection block 230 as a bundle It is advantageous to utilize rod 320 . As described above, since the disk-shaped closing plate 310 has already performed the function of a rainwater cover to prevent raindrops from penetrating into the hollow body 205, the provision of the rainwater cover 235 is not essential.

The flame arrester block 230 thus formed defines a plurality of radial passages for a fluid (steam or gas), the passages being formed transversely, for example substantially perpendicular to the X axis, and adjacent to one another. Intermediate spaces (gaps) formed by spacers 315 between various pairs of shaped plates 305, and intermediate spaces between the last annular plate 305 and disc-shaped closing plate 310 of the stack. is limited by

The thickness of the spacers 315 , that is, the distance between two adjacent annular plates 305 or the distance between the last annular plate 305 and the disc-shaped closing plate 310 of the stack, is determined by the flame arrestor block 230 . It is designed so that the flame 330, which may be generated from the outside, does not propagate into the hollow body 205, such propagation prevention is determined by heat transfer from the flame to the plates 305 and 310 of the flame prevention block 230. It is achieved by the action of digestion (“cooling”).

Structural parameters determining the configuration of the flame arrester block 230 are merely a few, and can be summarized as follows: the thickness (s) of the annular plates 305 , adjacent in the stack. The distance d between the annular plates 305, that is, the distance d between the last annular plate 305 of the stack and the disc-shaped closing plate 310, is formed by each annular plate 305 The width of the circular crown to be formed (indicated by L in FIG. 6 ), the outer diameter (D) of the annular plates 305 , the number of annular plates 305 stacked to form a bundle, and the material of the annular plates 305 . .

The values of these structural parameters are selected according to the fluid of the particular application of interest and the operating conditions of that fluid in the application under consideration (eg pressure and temperature inside the tank 105 ).

In particular, the distance between adjacent annular plates 305 and the distance between the last annular plate 305 of the stack and the disc-shaped closure plate 310 is of particular interest for the particular application for the time being considered. The value of the parameter known as the Maximum Experimental Safe Gap (MESG) for the fluid may have a magnitude. The MESG parameter is defined in ISO 16852, a reference standard for flame arrester testing. According to the reference standard, for example, the MESG value for a class IIA fluid (eg propane) is 0.9 mm, and for a class IIB3 fluid (eg ethylene), the value is 0.9 mm. The value of the MESG is 0.65 mm, and the value of the MESG for a class IIC fluid (eg hydrogen) is 0.5 mm. Given a particular fluid in the application of interest, the distance between the annular plates 305 and between the last annular plate 305 of the stack and the disc-shaped closure plate 310 is determined by the above standard of that fluid. It is preferably selected below a given MESG value.

The number of annular plates 305 to be stacked to form the flame arrester block 230 is determined by the maximum allowable pressure drop. Increasing the number of annular plates 305 in the stack decreases the pressure drop.

For example, in the case of using annular plates 305 with an inner diameter of 200 mm for class IIA fluid, if it is desired that the flow be full, ie that the flow cross-section of the gas does not decrease, it is approximately 0.9 Approximately 60 annular plates 305 spaced apart by mm may be provided. Doubling the number of annular plates 305 halves the pressure drop.

Advantageously, a rain cover to dissipate the heat generated even in the presence of a continuous flame 330 (so-called “endurance burning”), i.e. a flame that does not extinguish after a short period of time and persists for an indefinite time. It is not necessary to provide a system for opening 235 , as schematically shown in FIG. 3a , flame 330 (as occurs in a CMR flame arrester) is placed on top of flame arrester block 230 , i.e. Rainwater is not locally driven into the area covered by the cover 235 (which inhibits heat dissipation), but is distributed entirely around the flame arrester block.

It has been found that a suitable structure of the flame arrestor block 230 that can withstand continuous flames, ie can withstand durable combustion, is as follows:

- for class IIA fluid: a structure in which 20 annular plates 305 having a thickness (s) of 1 mm and an outer diameter (D) of 15 mm are spaced apart from each other by a distance (d) of 0.5 mm;

- for class IIB fluid: 20 annular plates 305 having a thickness (s) of 1 mm and an outer diameter (D) of 20 mm are spaced apart from each other by a distance (d) of 0.3 mm rescue;

- for class IIC fluid: 15 annular plates 305 with a thickness (s) of 1.5 mm and an outer diameter (D) of 25 mm spaced apart from each other by a distance (d) of 0.15 mm.

Optionally, one or more CMR flame arresting elements (not shown in the figure) may be combined with the flame arresting block 230 , which connects the CMR flame arresting elements in series, preferably upstream of the flame arresting block 230 . The CMR flame arresting elements are disposed in a position corresponding to the second end flange 225 inside the hollow body 205 , for example.

It is also possible to arrange two (and possibly more) flame arrester blocks 230 concentrically, for example within a flame arrester block 230 with a relatively large outer diameter D ( Another flame arrester block 230 with D) can be coaxial (along the X axis) by being arranged in a nested way. From the perspective of the fluid path, the two flame arresting blocks 230 (preferably not in thermal contact with each other) are in series. An example of such a configuration is shown in FIG. 3B , where the outer flame arrester block is indicated by '230-e' and the inner flame arrester block is indicated by '230-i'.

The flame protection block 230 described above can be applied not only to the line-end type protection device 130 , but also to other protection devices against fire and explosion, for example, flammable vapor 115 . It can be applied to the protection of tanks 105 intended to contain flammable liquids 110 such as emanate oils or derivatives of oils.

For example, as shown in FIG. 7 , one or more flame arresting blocks 230 may be mounted to the breather valve 705 . The breather valve is designed to prevent deformation of the tank, which may be caused by an increase or decrease in pressure inside the tank, which may be caused by, for example, filling or draining liquid from a tank intended to contain liquid. It is known as designed valve protection device.

Referring to FIG. 7 , the breather valve 705 includes an overpressure (release) valve 715 and a vacuum (low pressure) valve 710 coupled to each other and in fluid communication. The vacuum valve 710 operates to compensate (by air from the external environment) a drop (low pressure) inside the tank to which the breather valve 705 is applied. The overpressure valve 715 operates to compensate (by venting to atmosphere) the overpressure inside the tank to which the breather valve 705 is applied.

The breather valve 705 includes a first valve hollow body 720 for the vacuum valve 710 and a second valve hollow body 725 for the overpressure valve 715 . wherein the first valve body 720 and the second valve body 725 are coupled and in fluid communication with each other (in another embodiment, the first valve body 720 and the second valve body 725 are a single unit) can be formed from the body of). The first valve body 720 includes a flange 730 for attachment to a tank (or a flanged pipe that is in fluid communication with the inside of the tank), a first valve that allows the inside of the first valve body 720 to communicate with the atmosphere. a first opening 735 , and a second opening 737 for fluid communication with a second valve body 725 . A first shutter 740 for selectively opening and closing the first opening 735 is accommodated in the first valve body 720 , and the first shutter 740 operates by simple gravity (or spring action). It works. The second valve body 725 includes a first opening 745 for fluid communication with the first valve body 720 and a second opening 750 for fluid communication with the atmosphere inside the first valve body 720 . ) is included. A second shutter 755 for selectively opening/closing the second opening 750 is accommodated in the second valve body 725 , and the second shutter 755, like the first shutter 740 , has a simple gravity ( or by the action of a spring).

With respect to the first opening 735 of the first valve body 720 and the second opening 750 of the second valve body 725 , the first flame protection as described above with reference to FIGS. 2 to 6 . A block 230-1 and a second flame arrester block 230-2 are provided.

A rainwater cover 765 is mounted on the second flame prevention block 230-2 (however, as described above, the closing plate 310 of the second flame prevention block performs the function of a screen for the passage of raindrops. Therefore, rainwater cover is not necessarily provided).

The breather valve 705 provides protection against atmospheric flame propagation, thanks to the two flame arresting blocks 230-1 and 230-2 provided in the atmospheric-facing openings of the valve itself.

In addition to the breather valve and line-ended protection devices such as the line-ended protection device 130 and breather valve 705 described above, the flame arrester block 230 may be used with other protection devices, for example, For example, it may be used with an in-line protective device, a low pressure valve, and an overpressure valve, shown by way of example in FIG. 8 and designated 805 .

The in-line protection device 805 can be used to protect a pipe from, for example, a petrochemical, chemical, pharmaceutical plant, etc., more generally from a portion of a pipeline wherever a flammable fluid (steam or gas) is present. It can be used to prevent the propagation (propagation) of the flame to other parts of the pipeline while still allowing the flow of fluid. A flame may occur, for example, when deflagration or detonation is present in the pipeline. In particular, the in-line protection device 805 shown in the figure is bidirectional to prevent flame propagation from both sides.

The in-line protection device 805 has two flanged ends 810 and 815 for attachment to the first and second portions of the pipeline to be protected (not shown in the figure). includes junctions. The central portion of the in-line protection device 805 is provided with a pair of flame arresting blocks 230-3 and 230-4 of the type described above with reference to FIGS. 2 to 6 , the pair of The flame prevention blocks 230-3 and 230-4 of the bar are arranged opposite to each other, that is, their respective closing plates 310-3 and 310-4 are arranged to face each other. The two flame arresting blocks 230 - 3 and 230 - 4 are accommodated in the jacket 820 of the in-line protection device 805 . The arrows shown in the figure schematically indicate possible fluid paths (and vice versa).

Another possible embodiment of bidirectional in-line protection devices 905 and 1005 is shown in FIGS. 9 and 10 , respectively.

The in-line protection device 905 includes two joints with flange ends 910 and 915 for attachment to a first and a second portion of the pipeline to be protected (not shown in the figure). do. The central portion of the in-line protection device 905 is provided with a pair of flame arresting blocks 230-3 and 230-4 of the type described above with reference to FIGS. 2 to 6 , the flame protection block The poles 230 - 3 and 230 - 4 are arranged to face each other and have a common closing plate 310 to form one assembly. The two flame arresting blocks 230-3 and 230-4 are separated by a jacket 920 having a side wall 920-1 (cylindrical for example) and two end walls 920-2. Surrounded, the end walls 920 - 2 are attached (eg, by soldering) to one of each of the junctions 910 and 915 . The jacket 920 is tightened between a pair of rings 925 by tie rods 930 arranged sequentially, preferably in a circumferential direction. Screws 935 secure each of the rings 925 to each of the end walls 920 - 2 of the jacket 920 . This in-line protection device 905 can be removed directly on site (ie without the need to disconnect the protection device from the pipeline), and also of the flame arrester blocks 230-3, 230-4. Enables on-site inspection and cleaning. The in-line protection device 905 can be opened by loosening the tie rods 930 . As the screws 935 are loosened to access the flame arresters 230-3 and 230-4, the jacket 920 is moved along the X-axis so that the flame arresters 230-3 and 230-4 are come out of the covered state. The assembly of the two flame arresting blocks 230-3 and 230-4 has annular grooves formed in the end walls 920-2 of the jacket 920 (with sufficiently low tolerances to prevent propagation of the flame). It stays inside, but can move freely along the X axis.

The in-line protection device 1005 comprises two joints with flange ends 1010 and 1015 for attachment to a first and a second part of the pipeline to be protected (not shown in the figure). do. The central portion of the in-line protection device 1005 is provided with a pair of flame arresting blocks 230-5 and 230-6 of the type described above with reference to FIGS. 2 to 6 , the pair of The flame arrester blocks 230-5 and 230-6 are disposed to face each other while facing the closing plates 310-5 and 310-6. The two flame arresting blocks 230-5 and 230-6 are separated by a jacket 1020 having a lateral wall 1020-1 (cylindrical for example) and two end walls 1020-2. Surrounded, the jacket is tightened between a pair of rings 1025 by tie rods 1030 arranged sequentially, preferably in a circumferential direction. Each of the two flame arresting blocks 230 - 5 and 230 - 6 is mounted to each of the jacket end walls 1020 - 2 by tie rods 1035 . This in-line protection device 1005 can also be removed directly on site (ie without the need to disconnect the protection device from the pipeline), which after loosening the tie rods 1030 (flame protection blocks) This is done by pulling out the jacket 1020 laterally (with 230-5 and 230-6 housed therein). Once the jacket 1020 is withdrawn, access is made to the flame arresting blocks 230-5 and 230-6 by pulling out the end walls 1020-2 of the jacket 1020.

7 to 10 (as well as other protection devices such as overpressure valves and low pressure valves) optionally combining one or more CMR flame arresting elements with flame arresting block 230 ; and/or two (or two or more) flame arresting blocks 230 arranged coaxially concentrically (along the X axis), but relatively inside flame arresting block 230 having a relatively large outer diameter (D). It is possible to provide another flame arrester block 230 with a small outer diameter (D) to be placed.

Various modifications may be made to the above-described embodiments of the flame arrester blocks 230 , 230-1 , 230-2 , 230-3 , and 230-4.

For example, instead of the spacers 315 being a separate part from the plates 305 and 310 , they are formed integrally with the plates 305 and/or the plates 310 , such as the holes 405 , for example. In a place corresponding to , the thickness of the material itself may be thick.

The plates 305 and 310 and/or the spacers 315, once stacked, may be configured to form entirely transverse interspaces, even if not strictly perpendicular to the X-axis. In particular, the plates 305 do not necessarily have a flat surface.

In addition, the annular plate 305 may have various shapes, such as, for example, an oval shape, a square shape, a rectangular shape, a diamond shape, a star shape, and a lobe shape. More generally, the plates 305 may be of any shape when viewed from above in a plan view, and having at least one opening in an outer perimeter and an inner region inside the outer perimeter.

Claims (13)

A flame and/or explosion protection device comprising an in-line protection device (805, 905, 1005) for protection against propagation of flames in the presence of deflagration or detonation,
The protection device includes two flame arresting blocks 230-3, 230-4, 230-5, 230-6, and the two flame arresting blocks 230-3, 230-4, 230-5, 230 -6) Each is:
at least one first plate 305 having an external perimeter and at least one aperture in an area inside the external perimeter; and
A second plate (310) for closure stacked on the at least one first plate (305) in the stacking direction (X), spaced apart (315) from the at least one first plate (305), the at least one and a second plate 310 that allows a gap transverse to the stacking direction X to be formed between the first plate 305 and the second plate 310 of the
The two flame prevention blocks 230-3, 230-4, 230-5, and 230-6 are provided with a second plate 310-3 for bi-directional protection against flame propagation and to enable bi-directional flow of fluid. , 310-4, 310, 310-5, 3106) are disposed to face each other and are accommodated in a jacket (jacket; 820, 920, 1020), the protection device. According to claim 1,
the second plate (310) is spaced apart from the first plate (305) by at least one spacer (315). 3. The method of claim 2,
The at least one first plate 305 includes a plurality of first plates 305 stacked on each other in the stacking direction (X), and the first plates 305 are interconnected by individual spacers 315 . spaced apart to form a plurality of gaps between adjacent pairs of the plurality of first plates (305). 4. The method according to any one of claims 1 to 3,
The first plate (305) has the form of an oval frame, a star-shaped frame, a frame with lobes, a rectangular frame, or an annular frame. 5. The method of claim 4,
The second plate 310 has a shape corresponding to the shape of the first plate, in particular, has a disk shape or a rectangular shape, a protection device. 4. The method of claim 2 or 3,
wherein the at least one spacer is a washer. 4. The method of claim 2 or 3,
The at least one spacer is a thick portion of the first plate (305) and/or the second plate (310). 4. The method of claim 2 or 3,
wherein the at least one first plate (305) and the second plate (310) are tightened to form a pack. 4. The method of claim 2 or 3,
A protection device comprising at least a first flame arresting block (230-e) and a second flame arresting block (230-i) arranged concentrically. delete delete delete delete

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