EP1327092A1 - Disque de decompression de surete - Google Patents

Disque de decompression de surete

Info

Publication number
EP1327092A1
EP1327092A1 EP01980065A EP01980065A EP1327092A1 EP 1327092 A1 EP1327092 A1 EP 1327092A1 EP 01980065 A EP01980065 A EP 01980065A EP 01980065 A EP01980065 A EP 01980065A EP 1327092 A1 EP1327092 A1 EP 1327092A1
Authority
EP
European Patent Office
Prior art keywords
rupture disc
skirt portion
dome
disc
rupture
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP01980065A
Other languages
German (de)
English (en)
Inventor
John Goddard
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP1327092A1 publication Critical patent/EP1327092A1/fr
Withdrawn legal-status Critical Current

Links

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
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
    • F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
    • F16K17/14—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side with fracturing member
    • F16K17/16—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side with fracturing member with fracturing diaphragm ; Rupture discs
    • F16K17/1606—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side with fracturing member with fracturing diaphragm ; Rupture discs of the reverse-buckling-type
    • F16K17/1613—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side with fracturing member with fracturing diaphragm ; Rupture discs of the reverse-buckling-type with additional cutting means

Definitions

  • the invention relates to a pressure relief device, and more particularly to a pressure relief valve having a metal rupture disc in the form of a thin rupturable member of a model structure.
  • the present invention relates to safety pressure relief devices and, in particular, to rupture disc assemblies, including reverse buckling rupture discs, and also to methods of manufacturing such rupture discs and assemblies.
  • Rupture discs have been known in this art for many years. Normally, rupture discs are manufactured to have a rupturable membrane to provide a safety mechanism to relieve excessive pressure within an over-pressurized system or vessel. The rupture disc and/or rupture disc assemblies are typically placed within such a system or vessel so as to prevent the flow of a liquid or a gas through such a device until the rupture disc ruptures through excessive or overpressure loads.
  • Prior art rupture disc assemblies include a support ring providing cutting projections to initiate a tear or shear in the disc upon reverse buckling.
  • Such assemblies are generally restricted in their use in that they are generally capable of use with gases only and sometimes within a restricted pressure range. Further, such known arrangements tend to have a fairly high rate of failure to burst within a desired pressure range.
  • Reverse buckle (or inverting) rupture disc systems consist in general of a dome- shaped metal disc which is held in a sandwich-like arrangement between two annular retainers and a support ring. The convex side faces the pressurized gas.
  • the retainers may include cutting members for assisting rupture of the disc. Upon being subjected to sufficient pressure, the disc inverts and ruptures to relieve the excess pressure.
  • an improvement in a reverse buckling rupture disc in which the disc has a mounting flange and a pressure rupturable member.
  • the improvement of the present invention is where there is provided a rupturable member comprising a one piece rupture disc having a dome-shaped member projecting outwardly from said flange comprising an outer skirt portion having a first taper merging at a merger region with an inner arcuately shaped and inwardly extending dome which has a diameter less than that of the diameter of said skirt portion.
  • the rupturable member comprises a one piece rupture disc having dome- shape members projecting outwardly from said flange, with the base region is a skirt which flares outwardly in a generally arcuately shaped wall extending in said axial direction in an arcuately and inwardly oriented configuration (i.e. oppositely curved from the main domed portion).
  • the inner main dome-shaped portion comprises a second oppositely arcuately shaped and inwardly extending wall which has a diameter less than that of the diameter of said first portion.
  • the second arcuately shaped wall extends from said first arcuately shaped wall.
  • the outwardly flared portion of the dome reduces the force required to invert the dome in a disc of any given set of dimensions. This results in a greater measure of precision in the pressure level required to invert and thereby burst the disc.
  • the outwardly flared base region or skirt comprises a straight- sided truncated cone (i.e. has a frusto-conical shape) or bows convexly outwardly, provided however that the skirt flares outwardly at a shallower angle than the adjoining dome wall.
  • a further aspect of the invention resides in the junction region between the skirt and dome forming a sharp change in angle relative to the curvature of the dome wall.
  • a method of forming a rupture disc by providing a sheet of deformable material, forming a flange adapted to surround a dome structure, deforming the deformable sheet to form an outer dome comprising an outer skirt portion merging with the flange, further deforming the sheet of material beyond the skirt portion to form an inner dome and in which the deformation is carried out to an extent such that the inner dome has a diameter less than that of the skirt portion.
  • the rupture disc defined above has an inner dome having a steeper angle of inclination than the skirt portion where the inner dome merges with the outer skirt, relative to the angle of inclination between the skirt portion and the flange.
  • Another aspect of the present invention consists of a rupture disc assembly with a support ring adapted to support the rupture disc of the type described above.
  • the support ring has a central aperture and means to initiate a tear , shear or cut in the rupture disc upon the disc reversing.
  • the means to initiate the tear shear or cut comprises at least one projection mounted on or protruding from said support ring.
  • the projection comprises a plurality of contiguous cutting means projecting inwardly from the aperture, said cutting means being adapted to contact the skirt position upon reverse buckling of said disc.
  • the above referenced cutting means comprises a plurality of arcuately contoured segments having an innermost arc portion and corresponding outer projections.
  • the first accurately shaped wall of said first dome includes a plurality of spaced apart inwardly and upwardly contoured recesses.
  • the rupture disc skirt member is generally polygon- shaped when viewed in plan view.
  • the inner dome portion comprise a continuous arc or curvature extending from said skirt to the top of said rupture disc.
  • the radius of curvature between the lower skirt portion and the flange, as well as the radius of curvature between the skirt and the upper dome portion is not critical per se. It can vary from being a relatively smooth transition with a rounded contour to a sharp transition.
  • the rupture disc and support ring may be made of any suitable material from which conventional rupture discs and supports are made. Normally such materials are various types of metals or alloys such as stainless steel. The thickness of the materials used to form and support the rupture disc determine the rupture characteristics, etc. and are also known in the art.
  • the rupture disc may be formed by different techniques known to those skilled in the art, one preferred technique uses cold deformation of a sheet of metallic material by the action of a press to deform the material into a shaped die. Thus, a die of the desired shape is provided and by deforming the metal to assume the shape of the die, the double dome of the rupture disc can be generated.
  • the support ring can likewise be formed by conventional means such as with the use of a die having the desired configuration of the cutting means or alternatively by punching out a sheet of metal so that the support ring has the desired configuration followed by a separate bending operation to deform the cutting means into the desired angle for contact with the rupture disc upon the disc reversing.
  • the products of the present invention can be manufactured in various sizes ranging from relatively small discs for use in conventional fields to very large diameter discs for specialized industrial applications.
  • the discs of the present invention can be used for both gaseous and liquid applications, and find desirable use in low pressure applications.
  • the discs of the present invention have the advantage that they are more reliable than prior art proposals relative to operating characteristics.
  • Figure 1 is an exploded cross-sectional view of a bursting disc assembly
  • Figure 2 is a top view of a rupture disc
  • Figure 3 is a top view of a support ring
  • Figure 4 is a cross-section of the disc taken along the line A-A of Figure 2;
  • Figure 5 is a cross-section taken along the line B-B of Figure 3.
  • Figure 6 is a perspective view of the rupture disc of the present invention.
  • FIG. 1 A typical assembly is illustrated in Figure 1 incorporating the rupture disc of the present invention, indicated by reference numeral 12, together with a support ring indicated by reference numeral 14, in combination with upper and lower (outlet and inlet) holders 18 and 16 respectively.
  • the assembly consists of the above parts joined together with the rupture disc generally sitting in a recess 28 of the lower holder 16 and with the support ring 14 lying on the outer surface.
  • the outer rim 28 of the lower holder 16 is interrupted and provided with a gap or interruption 30.
  • the gap 30 is provided or interrupted by one or more projections in the outer rim or wall portion, each of which forms an upstanding tooth-like shape or member 32.
  • the projections or members 32 are adapted to mate with or cooperate with a corresponding or mating portion on another component of the overall assembly as described hereinafter.
  • the projection 32 is spaced midway between the outer rim 28 and an inner ring wall 24.
  • the upper holder 18 includes a corresponding or mating recessed shoulder portion 70 having a circumferential or annular seat to that of the outer rim of the lower holder 16.
  • the mating portion 70 forms a seat in the upper holder 18, which is interrupted by spaced apart projections 74 and 76.
  • Projections 74 and 76 are dimensioned to correspond with the gap portions 30 of the outer rim 28 of the lower holder.
  • a recess 80 is provided in the upper holder 18 which mates with the projection 32 described above.
  • the recess 80 is generally of a similar configuration or shape to the projection 32 in order to cooperate with the latter.
  • the corresponding projections of the upper holder 18 aid in the proper seating and assembly of the rupture disc assembly, by ensuring that the gap portions and projections are mated correctly in an abutting relationship. If the upper and lower holders 18 and 16 are not properly assembled such that the upper and lower holders are properly aligned, the upper and lower parts will not properly mate, or seat, providing an obvious visual cue that the parts are misaligned.
  • the assembly may be inserted in a pressure line and clamped together by conventional means, normally between flanges of adjacent pipe sections.
  • the outer surface 25 of lower holder 16 will normally rest on the face of a first flange of a pipe section (not shown), while the outer surface 66 of the upper holder 18 will rest on a separate adjacent flange of a second pipe section (not shown).
  • the disc 12 includes a conventional flange 20 extending about the periphery of the disc and which is adapted to provide a seating surface for the disc with a flange, as well as to provide a surface engageable with the support ring 14.
  • the rupture disc includes outer and inner dome sections referenced generally by numerals 22 and 24 respectively.
  • Dome 22 is the lowermost outer dome and comprises a generally inwardly and concavely arcuately extending wall 26.
  • the lower wall 26 of the dome actually comprises a plurality of segments 26a, 26b etc. which are formed by concave recesses in the wall, extending interiorly of the dome and which provide a generally polygonally shaped outline to the first dome when viewed from a top plan view.
  • the inwardly and concavely arcuately tapering configuration of the wall 26 is preferably substantially uniform about the circumference of the wall 26 and typically if one were to measure the average diameter of the wall 26 where it intersects with the flange 20, the first dome section will cover approximately 2% to 25% of the diameter D as measured across the opening of the upper and lower holders 18 and 16; preferably the closure of the diameter of the opening of the upper and lower holders is between 5% and 20% formed by the lower wall of the rupture disc.
  • the size (height) of the first or outer dome or skirt 22 relative to size (height) of the inner dome 24 will vary considerably. Expressed in terms of a height percentage of the lower or outer skirt 22 relative to the height of the second dome, as measured from the commencement of the flange or above the base of the first dome or skirt 22.
  • the height of the lower dome can be, for example, from 0.9% to about 35% of the height of the total height of the combined first and second domes.
  • this height for the outer dome ranges from about 1.0% to 30% of the height of both domes; other embodiments are where the height of the outer dome or skirt ranges from 1.2% to 28% of the total height of both components.
  • the height of the respective domes will vary depending on the diameter of the rupture disc and its intended use in different industrial fields.
  • the outer wall 26 of the first dome or skirt 22 desirably inwardly and arcuately tapers; in practice, this wall 26 may extend inwardly, relative to the flange 20 of the disc 12, in an inclined relationship to the flange 20.
  • the degree of inclination can be relatively shallow, e.g. 1 or 2 degrees, depending on manufacturing techniques and tolerances and properties desired in the rupture disc.
  • the angle of inclination can be up to 45 degrees. Preferred ranges are from 5 degrees to 30 degrees and more desirably 6 to 15 degrees.
  • the second or upper (inner) dome 24 is preferably constituted by a continuous convexly curving wall merging on its lower end with the wall 26 of the lower dome in a generally constant radius of curvature (see e.g. Figures 4 and 6).
  • This radius of curvature can vary considerably and although a relatively smooth and continuous radius is desired, it has been found that relatively sharp radii can be employed in products of the present invention without significant losses in product characteristics.
  • the dome 24 will have a variable height depending on the burst characteristics desired for any given application.
  • the height of the dome may involve a wall structure which, rather than being of a constant curvature, may have differing non-constant curved sections for certain applications in different fields.
  • the rupture disc of the present invention may also incorporate known features such as recesses or dents in the dome to modify the properties of the dome for various uses or different applications.
  • the outer wall or skirt 26 may alternatively have a generally inwardly tapering, straight or planar wall as seen in Figure 1.
  • the skirt defines a truncated cone, the angle of taper is which broader and shallower than the angle of inward tapering of the inner dome 24 at the point where the skirt 26 meets the dome 24.
  • the skirt 26 may have a convex curvature, provided however that the skirt flares outwardly from the inner dome portion 24.
  • the point of intersection between the inner and outer portions 26 and 24 are characterized by a relatively sharp change or break in curvature.
  • the outer skirt 26 has a relatively shallow angle at the point where it meets the inner dome 24, while the wall of the dome at this same point, being near the base of the dome has a relatively steep angle.
  • this relatively abrupt change in angle assists in providing superior rupturing characteristics. This effect may also be achieved by the relatively shallow angle of disposition of the outer skirt portion.
  • the ring 14 includes a generally circular flange portion 25.
  • the ring 14 generally has an aperture which is relatively close to the size of the aperture of the upper and lower holders but, includes a plurality of cutting means in the form of projections 72 which are actually spaced apart teeth 78 which extend downwardly and inwardly into proximity of the lower wall 26 of the rupture disc, when the supporting ring 14 is assembled with the rupture disc.
  • the teeth 78 are in the form of relatively sharp points and while one version of the teeth can be seen from the drawings, it will be understood that other cutting means may be employed.
  • different patterns of cutting means in place of the arcuately contoured embodiment illustrated may be used.
  • a knife assembly can be used to tear, cut or shear the rupture disc upon reversing.
  • the tab 104 of the support ring includes an aperture 102 generally in the form of a rectangular opening.
  • This aperture 102 is adapted to receive the projection 32 to position the support ring 12 in proper alignment with the lower holder 16 as described previously. It should also be understood that the various disclosed embodiments are merely exemplary and are utilized in a manner as would be readily understood by a person in the art.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Safety Valves (AREA)

Abstract

L'invention concerne un disque de rupture à flambage inverse (12) composé d'une aile de montage (20) et d'un élément pouvant être rompu par la pression (24), lequel comprend un disque de rupture d'une seule pièce composé de deux éléments en forme de dôme (22, 24) qui font saillie à partir de l'aile et sont situés dans la même orientation axiale. Le premier élément en forme de dôme (22) comprend une paroi inférieure, de forme sensiblement arquée, qui s'étend dans la direction axiale, selon une configuration arquée orientée vers l'intérieur. Le second élément en forme de dôme (24), situé au-dessus du premier, est constitué d'une seconde paroi arquée orientée vers l'intérieur dont le diamètre est inférieur à celui du premier élément en forme de dôme. La seconde paroi arquée s'étend à partir de la première arquée. L'ensemble disque de rupture comprend un anneau de support conçu pour supporter la rupture due à une ouverture centrale et un dispositif conçu pour entamer une déchirure dans ledit disque de rupture.
EP01980065A 2000-10-02 2001-10-02 Disque de decompression de surete Withdrawn EP1327092A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
CA2321939 2000-10-02
CA002321939A CA2321939A1 (fr) 2000-10-02 2000-10-02 Anneau de retenue de disque de rupture avec motif de coupe et saillie en trefle
PCT/CA2001/001411 WO2002029296A1 (fr) 2000-10-02 2001-10-02 Disque de decompression de surete

Publications (1)

Publication Number Publication Date
EP1327092A1 true EP1327092A1 (fr) 2003-07-16

Family

ID=4167287

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01980065A Withdrawn EP1327092A1 (fr) 2000-10-02 2001-10-02 Disque de decompression de surete

Country Status (4)

Country Link
EP (1) EP1327092A1 (fr)
AU (1) AU2002212001A1 (fr)
CA (1) CA2321939A1 (fr)
WO (1) WO2002029296A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2382844C (en) * 2001-10-09 2010-03-11 Elfab Ltd Safety pressure relief device
DE102021106903A1 (de) * 2021-03-19 2022-09-22 Konzelmann Gmbh Druckausgleichsvorrichtung

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2093527B (en) * 1981-02-19 1984-05-16 Imi Marston Ltd Reverse buckling bursting disc
US4691729A (en) * 1984-06-06 1987-09-08 Clift Miner E Reverse-buckling rupture disk with replaceable disk and blade
US5570803A (en) * 1992-01-21 1996-11-05 Bs&B Safety Systems, Inc. Rupturable pressure relieving apparatus and methods of manufacturing the same
US6220269B1 (en) * 1999-12-30 2001-04-24 Process Equipment Inc. Bursting disc assembly retaining ring with a clover leaf cutting pattern and projection

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0229296A1 *

Also Published As

Publication number Publication date
CA2321939A1 (fr) 2002-04-02
WO2002029296A1 (fr) 2002-04-11
AU2002212001A1 (en) 2002-04-15

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