GB1471663A - Explosive cutting device - Google Patents

Explosive cutting device

Info

Publication number
GB1471663A
GB1471663A GB2874373A GB2874373A GB1471663A GB 1471663 A GB1471663 A GB 1471663A GB 2874373 A GB2874373 A GB 2874373A GB 2874373 A GB2874373 A GB 2874373A GB 1471663 A GB1471663 A GB 1471663A
Authority
GB
United Kingdom
Prior art keywords
casing
cutter
explosion
pipe
chamber
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.)
Expired
Application number
GB2874373A
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.)
BP PLC
Original Assignee
BP PLC
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 BP PLC filed Critical BP PLC
Priority to GB2874373A priority Critical patent/GB1471663A/en
Priority to NO742168A priority patent/NO742168L/no
Priority to DK322774A priority patent/DK322774A/da
Publication of GB1471663A publication Critical patent/GB1471663A/en
Expired legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B3/00—Blasting cartridges, i.e. case and explosive
    • F42B3/08—Blasting cartridges, i.e. case and explosive with cavities in the charge, e.g. hollow-charge blasting cartridges
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
    • B23D15/00—Shearing machines or shearing devices cutting by blades which move parallel to themselves
    • B23D15/12—Shearing machines or shearing devices cutting by blades which move parallel to themselves characterised by drives or gearings therefor
    • B23D15/14—Shearing machines or shearing devices cutting by blades which move parallel to themselves characterised by drives or gearings therefor actuated by fluid or gas pressure
    • B23D15/145—Shearing machines or shearing devices cutting by blades which move parallel to themselves characterised by drives or gearings therefor actuated by fluid or gas pressure actuated by explosion
    • 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
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L1/00—Laying or reclaiming pipes; Repairing or joining pipes on or under water
    • F16L1/12—Laying or reclaiming pipes on or under water
    • F16L1/20—Accessories therefor, e.g. floats or weights

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Crushing And Pulverization Processes (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)

Abstract

1471663 Shearing BRITISH PETROLEUM CO Ltd 11 June 1974 [18 June 1973] 28743/73 Heading B3W [Also in Division F3] An explosive cutter 1 comprises an expansion chamber 7 for the gas released by the explosion of a cutting charge in casing 2. A strand-off 8 spaces the easing 2 from a workpiece, e.g. a pipe 10. A filler port 6 for admitting explosive to the casing 2 is closable by a detonating cord gland (not shown) which engages a screw-thread 9. The chamber 7 and stand-off 8 are flushed with an inert gas, e.g. nitrogen, at one atmosphere and gas inlet at 5 and an outlet (not shown) are closed. The cutter 1 is placed against a plate or, in the form of a collar, about pipe 10 and the charge is detonated to sever the plate or pipe. The ratio of the volume of the explosion chamber to the combined volume of the casing 2 and stand-off 8 is at least 1À5 : 1 preferably 2 to 5 : 1. The casing 2 is so located that the effective centre of the explosion is at or near the geometric centre of the cross-section of the expansion chamber 7. An alternative embodiment of cutter has an outer casing of circular cross-section.
GB2874373A 1973-06-18 1973-06-18 Explosive cutting device Expired GB1471663A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB2874373A GB1471663A (en) 1973-06-18 1973-06-18 Explosive cutting device
NO742168A NO742168L (en) 1973-06-18 1974-06-14
DK322774A DK322774A (en) 1973-06-18 1974-06-17

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2874373A GB1471663A (en) 1973-06-18 1973-06-18 Explosive cutting device

Publications (1)

Publication Number Publication Date
GB1471663A true GB1471663A (en) 1977-04-27

Family

ID=10280399

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2874373A Expired GB1471663A (en) 1973-06-18 1973-06-18 Explosive cutting device

Country Status (3)

Country Link
DK (1) DK322774A (en)
GB (1) GB1471663A (en)
NO (1) NO742168L (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2368690A1 (en) * 1976-10-20 1978-05-19 Ici Ltd UNDERWATER BLASTING PROCESS
GB2240837A (en) * 1990-02-02 1991-08-14 Dresser Ind Perforating gun assembly and universal perforating charge clip apparatus.
WO1993020401A1 (en) * 1992-04-06 1993-10-14 Scientific And Manufacturing Center 'kvazar-Vv' Limited Elongated shaped charge ''quasar'', method of making it and methods of shotfiring

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2368690A1 (en) * 1976-10-20 1978-05-19 Ici Ltd UNDERWATER BLASTING PROCESS
GB2240837A (en) * 1990-02-02 1991-08-14 Dresser Ind Perforating gun assembly and universal perforating charge clip apparatus.
GB2240837B (en) * 1990-02-02 1993-12-01 Dresser Ind Perforating gun assembly charge clip
WO1993020401A1 (en) * 1992-04-06 1993-10-14 Scientific And Manufacturing Center 'kvazar-Vv' Limited Elongated shaped charge ''quasar'', method of making it and methods of shotfiring

Also Published As

Publication number Publication date
DK322774A (en) 1975-03-03
NO742168L (en) 1975-01-13

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19930611