GB2313795A - Pipeline filter - Google Patents

Pipeline filter Download PDF

Info

Publication number
GB2313795A
GB2313795A GB9609704A GB9609704A GB2313795A GB 2313795 A GB2313795 A GB 2313795A GB 9609704 A GB9609704 A GB 9609704A GB 9609704 A GB9609704 A GB 9609704A GB 2313795 A GB2313795 A GB 2313795A
Authority
GB
United Kingdom
Prior art keywords
filter
conical
pipe
frusto
mounting flange
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Withdrawn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
GB9609704A
Other versions
GB9609704D0 (en
Inventor
Neal Thomas Mcclellen
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.)
Gemalto Terminals Ltd
Original Assignee
Schlumberger Industries 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
Application filed by Schlumberger Industries Ltd filed Critical Schlumberger Industries Ltd
Priority to GB9609704A priority Critical patent/GB2313795A/en
Publication of GB9609704D0 publication Critical patent/GB9609704D0/en
Priority to NL1006012A priority patent/NL1006012C2/en
Publication of GB2313795A publication Critical patent/GB2313795A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/0002—Casings; Housings; Frame constructions
    • B01D46/0005—Mounting of filtering elements within casings, housings or frames
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/02—Particle separators, e.g. dust precipitators, having hollow filters made of flexible material
    • B01D46/06—Particle separators, e.g. dust precipitators, having hollow filters made of flexible material with means keeping the working surfaces flat
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2265/00—Casings, housings or mounting for filters specially adapted for separating dispersed particles from gases or vapours
    • B01D2265/04—Permanent measures for connecting different parts of the filter, e.g. welding, glueing or moulding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2275/00—Filter media structures for filters specially adapted for separating dispersed particles from gases or vapours
    • B01D2275/20—Shape of filtering material
    • B01D2275/201—Conical shape

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)

Abstract

A filter for use with industrial gas meters or regulators comprises an annular mounting flange 14 whose external diameter is greater than the diameter D of the pipe 12 in which the filter fits. The internal circumference of the mounting flange is bent over to form a frusto-conical portions 26 whose narrower end has an external diameter close to (or even slightly greater than) D, and a conical mesh filter member 20 is coaxially welded to the narrower end of the frusto-conical portion to form a continuation of its frusto-conical shape. The filter is mounted in the pipe 12 by welding the end of the pipe in a cylindrical aperture in a relatively thick annular flange member 14 so that the end of the pipe extends only part way into the aperture 16 the frusto-conical portion of the mounting flange being accommodated in the part of the aperture beyond the end of the pipe 18.

Description

FILTERS This invention relates to filters1 and is more particularly but not exclusively concerned with filters for use with low pressure industrial gas meters and gas regulators.
It is known to provide filters for connection upstream of industrial gas meters, particularly industrial gas meters of the positive displacement type, in order to filter out particulate matter which could otherwise adversely affect the meters. To achieve their goal, such filters need to be relatively fine, but this has the effect of producing an unacceptable pressure drop.
To overcome this problem, it is also known to make the filters generally conical in shape, which for a given diameter, increases their flow area. However, these known conical filters typically have a radial mounting flange which extends at least partly into the gas flow, partly offsetting the increase in flow area achieved by the conical shape and creating undesirable turbulence.
It is an object of the present invention to provide an improved conical filter in which these drawbacks of the known conical filters are at least partially alleviated.
According to the present invention, there is provided a filter for use in a pipe of internal diameter D, comprising an annular mounting flange whose external diameter is greater than D and whose internal circumference is formed into a frusto-conical portion whose narrower end has an external diameter substantially equal to (or even slightly greater than) D, and a conical mesh filter member coaxially joined to the narrower end of said frusto-conical portion and forming a continuation of its frusto-conical shape.
Thus in the filter of the invention, the filter member, ie the effective part of the filter from a filtering standpoint, is almost equal in diameter to the interior of the pipe, which enables the filter to be substantially longer than a conventional filter of the same apex angle. Additionally, the mounting flange hardly protrudes into the pipe at all.
Advantageously, the apex angle of the conical filter member is of the order of 150 to 300, and preferably about 220.
In a preferred embodiment of the invention, the apex of the conical filter member is generally hemispherical.
The filter member is preferably made from 250rum mesh, conveniently by forming a sheet of said mesh into a conical shape on a conical former.
The filter of the present invention is typically mounted in the pipe by securing the end of the pipe coaxially within a cylindrical aperture in a relatively thick annular flange member so that the end of the pipe extends only part way into the aperture, and holding the mounting flange in sealing engagement with the face of said flange member remote from the pipe, with said frusto-conical portion of the mounting flange disposed in the part of the aperture beyond the end of the pipe.
The invention will now be described, by way of example only, with reference to the accompanying drawing, which is a part-sectional view of a filter in accordance with the present invention mounted in a 3" steel gas pipe.
The filter illustrated in the drawing is indicated generally at 10, and is shown mounted in the end of a 3" steel gas pipe 12 having a relatively thick annular flange member 14 welded around the end containing the filter 10. For reasons which will become apparent hereinafter, the end of the pipe 12 extends only part way into the cylindrical aperture 16 defined by the flange member 14, leaving a part 18 of the aperture 16 clear of the end of the pipe 12.
The filter 10 comprises a conical filter member 20 made from 250Rm stainless steel mesh, having an annular stainless steel mounting flange 22 at its wider end and a generally hemispherical cap 24, also made from 250calm stainless steel mesh, at its apex. The filter member 20 is made by forming a flat sheet of the mesh around a conical former and spot welding the seam, but leaving the actual apex open: the cap 24 is then spot welded in place at the apex.
The internal circumference of the mounting flange 22 is spun over to form a short frusto-conical portion 26, which has the wider end of the filter member 20 spot welded into its narrower end, effectively forming a continuation of the frusto-conical shape of the portion 26.
The apex angle of the filter member 20 is typically about 22", the overall length of the filter 10 is typically about 173mm, the outer diameter of the mounting flange 22 is typically about 128mm, and the axial extent of the frusto-conical portion 26 of the flange 22 is typically about 6mm.
More significantly, the external diameter of the narrower end of the portion 26 of the flange 22 is very slightly greater than the internal diameter of the pipe 12, an arrangement permitted by the fact that the portion 26 of the flange 22 is disposed in use in the part 18 of the aperture 16 clear of the end of the pipe 12 (which part has a diameter equal to the external diameter of the pipe 12). It is this arrangement that enables the filter 10 to be substantially larger than prior art filters for use in the same size of pipe, the increased size creating a greater flow area and therefore reduced flow resistance and reduced pressure drop. This arrangement also ensures that the mounting flange 22 barely protrudes at all into the gas flow through the pipe 12 and the filter 10, thus reducing the creation of turbulence.
Additionally, the hemispherical cap 24 has been found to improve the flow regime through the filler 10, in contrast to the flow regime resulting from the flat cap normally provided on prior art filters of this general kind.
In use, the flange member 14 is clamped in sealing engagement with a corresponding flange member on a gas meter or gas regulator, trapping the mounting flange 22 between the flange members.
Many modifications can be made to the described embodiment of the invention. In particular, the dimensions given are exemplary only.

Claims (8)

1. A filter for use in a pipe of internal diameter D, comprising an annular mounting flange whose external diameter is greater than D and whose intemal circumference is formed into a frusto-conical portion whose narrower end has an external diameter substantially equal to (or even slightly greater than) D, and a conical mesh filter member coaxially joined to the narrower end of said frusto-conical portion and forming a continuation of its frusto-conical shape.
2. A filter as claimed in claim 1, wherein the apex angle of the conical filter member is of the order of 15 to 30".
3. A filter as claimed in claim 2, where the apex angle of the conical filter member is about 220.
4. A filter as claimed in any preceding claim, wherein the apex of the conical filter member is generally hemispherical.
5. A filter as claimed in any preceding claim, wherein the filter member is preferably made from 250Rm mesh.
6. A filter as claimed in claim 5, wherein the filter member is made by forming a sheet of said mesh into a conical shape on a conical former.
7. A filter substantially as hereinbefore described with reference to the accompanying drawing.
8. A filter as claimed in any preceding claim, the filter being mounted in the pipe by securing the end of the pipe coaxially within a cylindrical aperture in a relatively thick annular flange member so that the end of the pipe extends only part way into the aperture, and holding the mounting flange in sealing engagement with the face of said flange member remote from the pipe, with said frusto-conical portion of the mounting flange disposed in the part of the aperture beyond the end of the pipe.
GB9609704A 1996-05-09 1996-05-09 Pipeline filter Withdrawn GB2313795A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB9609704A GB2313795A (en) 1996-05-09 1996-05-09 Pipeline filter
NL1006012A NL1006012C2 (en) 1996-05-09 1997-05-09 Filter.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9609704A GB2313795A (en) 1996-05-09 1996-05-09 Pipeline filter

Publications (2)

Publication Number Publication Date
GB9609704D0 GB9609704D0 (en) 1996-07-10
GB2313795A true GB2313795A (en) 1997-12-10

Family

ID=10793433

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9609704A Withdrawn GB2313795A (en) 1996-05-09 1996-05-09 Pipeline filter

Country Status (2)

Country Link
GB (1) GB2313795A (en)
NL (1) NL1006012C2 (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB456468A (en) * 1935-07-31 1936-11-10 George Henry Alexander Improvements relating to air filters
US3794180A (en) * 1973-01-22 1974-02-26 W Blocker Flared cone filter
US4543114A (en) * 1983-10-31 1985-09-24 Porta-Test Systems, Ltd. Pipeline concave strainer
US4702754A (en) * 1986-04-04 1987-10-27 Blocker William C Vapor delivery pressure test adapter

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3731815A (en) * 1972-04-26 1973-05-08 Allied Chem Filter and method of manufacture
US3941697A (en) * 1974-12-30 1976-03-02 Johnson Louis B Automotive cooling system filter assembly
DE3328452A1 (en) * 1983-08-06 1983-12-08 GOK Regler- und Armaturen GmbH & Co KG, 5200 Siegburg Filter insert

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB456468A (en) * 1935-07-31 1936-11-10 George Henry Alexander Improvements relating to air filters
US3794180A (en) * 1973-01-22 1974-02-26 W Blocker Flared cone filter
US4543114A (en) * 1983-10-31 1985-09-24 Porta-Test Systems, Ltd. Pipeline concave strainer
US4702754A (en) * 1986-04-04 1987-10-27 Blocker William C Vapor delivery pressure test adapter

Also Published As

Publication number Publication date
NL1006012A1 (en) 1997-11-18
GB9609704D0 (en) 1996-07-10
NL1006012C2 (en) 2000-03-22

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)