GB2285284A - Reverse pressure support member for bursting disc - Google Patents

Reverse pressure support member for bursting disc Download PDF

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Publication number
GB2285284A
GB2285284A GB9423518A GB9423518A GB2285284A GB 2285284 A GB2285284 A GB 2285284A GB 9423518 A GB9423518 A GB 9423518A GB 9423518 A GB9423518 A GB 9423518A GB 2285284 A GB2285284 A GB 2285284A
Authority
GB
United Kingdom
Prior art keywords
support member
central portion
bursting disc
disc
apertures
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.)
Granted
Application number
GB9423518A
Other versions
GB9423518D0 (en
GB2285284B (en
Inventor
Fraser David Stuart Lawson
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.)
Elfab Ltd
Original Assignee
Elfab Ltd
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
Priority claimed from GB939325428A external-priority patent/GB9325428D0/en
Application filed by Elfab Ltd filed Critical Elfab Ltd
Priority to GB9423518A priority Critical patent/GB2285284B/en
Publication of GB9423518D0 publication Critical patent/GB9423518D0/en
Publication of GB2285284A publication Critical patent/GB2285284A/en
Application granted granted Critical
Publication of GB2285284B publication Critical patent/GB2285284B/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F16K17/162—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 non reverse-buckling-type

Abstract

A reverse pressure support member (24) for a bursting disc comprises an annular flange portion (26) and a central portion (28) in part at least of which is formed a symmetrical array of polygonal apertures (30), the array including an aperture (30') the centre of which coincides with the centre of the central portion (28) of the support member (24). Such an arrangement of apertures (3) enables a through-flow rate in excess of 70% on rupture of the associated disc whilst at the same time being able to withstand greater reverse pressures than heretofore. <IMAGE>

Description

REVERSE PRESSURE SUPPORT MEMBER FOR BURSTING DISC This invention relates to a reverse pressure support member for a bursting disc.
In order to support a domed bursting disc against reverse movement due to the creation of a vacuum or back pressure on the concave portion of the disc, it is established practice to provide a support member to the concave side of the disc, said member including a dome portion in which are formed a series of circular apertures.
Existing vacuum support members, on conventional bursting of the disc, are generally such as to permit a maximum flow rate therethrough of the order of 60%. It has proved difficult to manufacture vacuum support members which combine both the necessary strength for support purposes and which permit a flow rate therethrough in excess of 60%.
According to the present invention there is provided a reverse pressure support member for a bursting disc, the support member comprising an annular flange portion and a central portion in part at least of which is formed a symmetrical array of polygonal apertures, said array including a polygonal aperture the centre of which coincides with the centre of the central portion of the support member.
The provision of such an array of polygonal apertures results in a much stronger member than heretofore that is capable of providing a through flow rate of over 70% on rupture of the associated bursting disc.
In one embodiment of the invention for use in conjunction with a concave/convex bursting disc, the central portion of the support member comprises a concave/convex dome portion.
In an alternative embodiment of the invention for use in conjunction with a flat bursting disc, the central portion of the support member comprises a flat disc portion.
Conveniently the apertures are each hexagonal, the array comprising a honeycomb extending over the full area of the central portion of the support member.
An embodiment of the invention will now be described in greater detail by way of example only with reference to the accompanying drawings of which: Fig. 1 is a plan view of a support member according to the invention; Fig. 2 is a perspective view of the support member of Fig. 1 showing some only of the apertures therein; Fig. 3 is a section through a bursting disc assembly incorporating a vacuum support member according to the invention, and Figs. 3a, 3b and 3c show, respectively, the bursting disc, the seal membrane and the vacuum support member of the assembly of Fig. 3.
Referring to the drawings, Fig. 3 shows a bursting disc assembly the basic construction of which, apart from the vacuum support member, is of relatively conventional form.
This assembly, which is indicated generally at 2, is clamped between inlet and outlet holders 4, 6 respectively, which holders 4, 6 are themselves clamped between inlet and outlet flanges 8, 10 of the associated container to be protected, with gaskets 12, 14 sealing between the holders 4, 6 and the flanges 8, 10.
The assembly 2 is of generally concave/convex form with pressurised fluid normally being incident on the concave side of the assembly 2 as indicated by the arrow A.
Conditions can arise within the container whereby a vacuum is created therein, and there is then a tendency for the assembly 2 to collapse inwardly. This is prevented by the provision of a vacuum support member within the assembly which, as mentioned above, conventionally incorporates circular holes in the dome portion thereof for through-flow purposes.
The invention provides an improved vacuum support member capable of withstanding greater reverse pressures than the prior arrangements, and capable of accommodating more flow therethrough on forward bursting than heretofore.
More particularly, the illustrated assembly includes a forward bursting disc 16 including an annular flange portion 18 and a concave/convex dome portion 20 in which is formed a series of slits and aperture for controlled burst purposes.
A membrane 22, typically of PTFE, is provided on the inner face of the disc 16 to seal said disc, while the vacuum support member is indicated generally at 24 - the disc 16, membrane 22 and vacuum support member 24 are conveniently permanently fixed together and supplied as an assembly.
The vacuum support member 24, typically of stainless steel, includes an annular flange portion 26 and a concave/convex dome portion 28 in which is formed a honeycomb of hexagonal apertures 30 extending over the full area of the dome portion 26.
The honeycomb includes a central aperture 30' the centre of which coincides exactly with the centre of the dome portion 28. Such a construction provides an extremely strong member which is capable of withstanding substantial reverse pressures, and, being honeycombed over the whole bore of the prospective vent area through the disc 16, allows for over 70% fluid flow therethrough on rupture of the dome portion 20.
The thickness of the interconnecting strips 32 between adjacent apertures 30 is carefully chosen to suit particular requirements, and the symmetric angular nature of the apertures 30 enables these strips 32 to be of consistent thickness over the whole of the dome portion 28.
Thus it will be appreciated that more material can be removed from the dome portion 28 in the formation of the hexagonal apertures 30 than is the case in an arrangement of circular apertures, whilst still maintaining the necessary strength in the dome portion 24 for support purposes by way of the interconnecting strips 32.
Although described and illustrated as hexagonal, the apertures 30 can be of other polygonal configurations without departing from the scope of the invention.
Additionally, the support member of the invention can be applied to flat bursting discs as well as domed discs, in which case the central portion of the support member will itself be flat.

Claims (5)

1. A reverse pressure support member for a bursting disc, the support member comprising an annular flange portion and a central portion in part at least of which is formed a symmetrical array of polygonal apertures, said array including a polygonal aperture the centre of which coincides with the centre of the central portion of the support member.
2. A support member as claimed in claim 1 for use in conjunction with a concave/convex bursting disc, the central portion of the support member comprising a concave/convex dome portion.
3. A support member as claimed in claim 1 for use in conjunction with a flat bursting disc, the central portion of the support member comprising a flat disc portion.
4. A support member as claimed in any one of claims 1 to 3 in which the apertures are each hexagonal, the array comprising a honeycomb extending over the full area of the central portion of the support member.
5. A reverse pressure support member for a bursting disc substantially as described with reference to and as illustrated by the accompanying drawings.
GB9423518A 1993-12-13 1994-11-22 Reverse pressure support member for bursting disc Expired - Lifetime GB2285284B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9423518A GB2285284B (en) 1993-12-13 1994-11-22 Reverse pressure support member for bursting disc

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB939325428A GB9325428D0 (en) 1993-12-13 1993-12-13 Reverse pressure support member for bursting disc
GB9423518A GB2285284B (en) 1993-12-13 1994-11-22 Reverse pressure support member for bursting disc

Publications (3)

Publication Number Publication Date
GB9423518D0 GB9423518D0 (en) 1995-01-11
GB2285284A true GB2285284A (en) 1995-07-05
GB2285284B GB2285284B (en) 1997-06-25

Family

ID=26304013

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9423518A Expired - Lifetime GB2285284B (en) 1993-12-13 1994-11-22 Reverse pressure support member for bursting disc

Country Status (1)

Country Link
GB (1) GB2285284B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2177799A1 (en) 2008-10-17 2010-04-21 Elfab Limited Pressure surge sensor and assembly including such a sensor and a rupture disc
US7870865B2 (en) 2006-03-16 2011-01-18 Elfab Limited Safety pressure relief device
DE102015116228A1 (en) 2014-09-29 2016-03-31 Rembe Gmbh Safety + Control rupture disc

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB748953A (en) * 1953-05-22 1956-05-16 Distillers Co Yeast Ltd Pressure safety devices
GB774812A (en) * 1954-08-30 1957-05-15 Johnson Matthey Co Ltd Improvements in and relating to vacuum supports for pressure releasing devices
US4612739A (en) * 1981-12-07 1986-09-23 Continental Disc Corporation Low pressure venting panel
US5002085A (en) * 1990-02-12 1991-03-26 Bs&B Safety Systems, Inc. Low pressure non-fragmenting rupture disks
US5080124A (en) * 1989-09-28 1992-01-14 National Research Council Of Canada Rupture disc pressure relief device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB748953A (en) * 1953-05-22 1956-05-16 Distillers Co Yeast Ltd Pressure safety devices
GB774812A (en) * 1954-08-30 1957-05-15 Johnson Matthey Co Ltd Improvements in and relating to vacuum supports for pressure releasing devices
US4612739A (en) * 1981-12-07 1986-09-23 Continental Disc Corporation Low pressure venting panel
US5080124A (en) * 1989-09-28 1992-01-14 National Research Council Of Canada Rupture disc pressure relief device
US5002085A (en) * 1990-02-12 1991-03-26 Bs&B Safety Systems, Inc. Low pressure non-fragmenting rupture disks

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7870865B2 (en) 2006-03-16 2011-01-18 Elfab Limited Safety pressure relief device
EP2177799A1 (en) 2008-10-17 2010-04-21 Elfab Limited Pressure surge sensor and assembly including such a sensor and a rupture disc
DE102015116228A1 (en) 2014-09-29 2016-03-31 Rembe Gmbh Safety + Control rupture disc
DE102015116229A1 (en) 2014-09-29 2016-03-31 Rembe Gmbh Safety + Control rupture disc

Also Published As

Publication number Publication date
GB9423518D0 (en) 1995-01-11
GB2285284B (en) 1997-06-25

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Legal Events

Date Code Title Description
PE20 Patent expired after termination of 20 years

Expiry date: 20141121