US3279372A - Seismic detonator - Google Patents

Seismic detonator Download PDF

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Publication number
US3279372A
US3279372A US461352A US46135265A US3279372A US 3279372 A US3279372 A US 3279372A US 461352 A US461352 A US 461352A US 46135265 A US46135265 A US 46135265A US 3279372 A US3279372 A US 3279372A
Authority
US
United States
Prior art keywords
water
detonator
casing
seal
seismic
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 - Lifetime
Application number
US461352A
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English (en)
Inventor
Patterson Edward Mervyn
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.)
Imperial Chemical Industries Ltd
Original Assignee
Imperial Chemical 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 Imperial Chemical Industries Ltd filed Critical Imperial Chemical Industries Ltd
Application granted granted Critical
Publication of US3279372A publication Critical patent/US3279372A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F42B3/10—Initiators therefor
    • F42B3/103—Mounting initiator heads in initiators; Sealing-plugs
    • F42B3/107—Sealing-plugs characterised by the material used
    • 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
    • F42B3/10—Initiators therefor
    • F42B3/192—Initiators therefor designed for neutralisation on contact with water

Definitions

  • a seismic detonator comprises a casing having an aperture sealed with a water-destructible sealing plug which on immersion in water resists the ingress of water into the casing for a period sufiicient to permit the detonator to be fired but is thereafter affected by the water so that the seal becomes broken.
  • the plug Whilst the plug may be disposed in any aperture of the casing as, for example, in an aperture in the normally blind end of the detonator casing, it is more convenient for the water-destructible plug to be of resilient material and used in the mouth end of the casing as a replacement for the sealing plug normally disposed around the electrical leading wires of the electric fusehead.
  • the sealing plug can be of any material whose sealing effect is destroyed by water. It may, for example, be a bound composition which in contact with water breaks up and becomes dispersed. Preferably it is formed from water-soluble material and a material of slow-dissolving characteristics is desirable so as to permit a longer working time during which the detonator may be fired.
  • the water penetration time for current seismic prospecting operations is required to exceed 20 minutes.
  • Water-soluble or water-swellable polymeric materials which initially swell in water before becoming water-permeable are particularly suitable since they provide convenient working times.
  • the material should be capable of being readily moulded in plug form around electric leading wires.
  • a water-soluble cellulose ether such as, for example, methyl cellulose, plasticised as described in UK. patent specification No. 703,962 with a mixture of propylene glycol and glycerine, is an especially suitable thermoplastic water-soluble polymeric material. It can be used to form sealing plugs by the standard techniques employed in detonator manufacture and it gives a very water-tight seal around detonator sealing wires covered with thermoplastic material such as, for example, polyvinyl chloride. On immersion in sea water, the methyl cellulose plug slowly changes from a horn-like material to a soft jelly which eventually allows water or water-vapour to penetrate the interior of the detonator.
  • the detonator comprises an elongated cylindrical casing 11 of an aluminum/manganese alloy containing at its blind end a pressed base charge 12 of pentaerythritol tetranitrate covered by a priming charge 13 of a lead azide containing initiating composition.
  • a plug 17 consisting of 55 weight percent methyl cellulose composition, commercially available as Methocel (R.T.M.) 60 HG 50, 35 weight percent propylene glycol and 10 weight percent glycerine, is formed by injection moulding around the leading wires and the mouth portion of the casing is crimped around the plug by a multi-ring crimp.
  • a seismic detonator for use when immersed in and in contact with water, said detonator comprising a fusehead, an explosive charge and time delay means operative when said detonator is immersed in water to seal said fusehead and explosive charge against contact with the water during positioning of said detonator in a body of water and subsequently to desensitize said detonator if said detonator has not been fired, said means including a casing surrounding said fusehead and said explosive charge, said casing having an aperture provided with a water-destructible seal which on immersion in water, resists the ingress of water into said casing for a predetermined period of time sufiicient to permit said detonator to be fired and is thereafter afi'ected by the water so that said seal becomes broken and permits water to enter said casing whereby said detonator is rendered harmless if it becomes lost in an underwater location without first having been fired.
  • a seismic detonator as in claim 10 wherein said seal is formed from material consisting of 55 weight per- 4 cent methyl cellulose, 35 weight percent propylene glycol and 10 weight percent glycerine.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Connector Housings Or Holding Contact Members (AREA)
  • Air Bags (AREA)
  • Thermistors And Varistors (AREA)
  • Geophysics And Detection Of Objects (AREA)
US461352A 1964-06-04 1965-06-04 Seismic detonator Expired - Lifetime US3279372A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB23225/64A GB1033793A (en) 1964-06-04 1964-06-04 Seismic detonator

Publications (1)

Publication Number Publication Date
US3279372A true US3279372A (en) 1966-10-18

Family

ID=10192188

Family Applications (1)

Application Number Title Priority Date Filing Date
US461352A Expired - Lifetime US3279372A (en) 1964-06-04 1965-06-04 Seismic detonator

Country Status (6)

Country Link
US (1) US3279372A (de)
AT (1) AT260081B (de)
DE (1) DE1247917B (de)
ES (1) ES313756A1 (de)
FR (1) FR1438690A (de)
GB (1) GB1033793A (de)

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3322066A (en) * 1966-02-08 1967-05-30 Trojan Powder Co Self-destructive explosive cartridge for underwater seismic exploration
US3348483A (en) * 1966-03-16 1967-10-24 Re Lo Mfg Co Can for explosive charge
US3356024A (en) * 1966-11-09 1967-12-05 Hercules Inc Self-disarming electric blasting caps and assembly containing same
US3358600A (en) * 1966-01-13 1967-12-19 Trojan Powder Co Self-destroying explosive cartridge for underwater seismic exploration
US3358601A (en) * 1966-06-29 1967-12-19 Hercules Inc Initiator systems
US3372640A (en) * 1966-08-03 1968-03-12 Du Pont Water-desensitized blasting caps
US3374736A (en) * 1966-08-02 1968-03-26 Du Pont Water desensitized water work boosters
US3415188A (en) * 1967-03-31 1968-12-10 Atlas Chem Ind Sea water destructible booster assembly
US3415189A (en) * 1967-03-24 1968-12-10 Atlas Chem Ind Water destructible electric match
US3430566A (en) * 1966-03-18 1969-03-04 Ici Ltd Marine seismic detonator
US3451341A (en) * 1967-09-22 1969-06-24 Hercules Inc Booster structure
US3727512A (en) * 1969-03-13 1973-04-17 Zeebrugge Forges Sa Process for the surface treatment of non metallic cases such as cartridges, and the so treated cases
US3865008A (en) * 1970-02-04 1975-02-11 Arwyn Theophilus Thomas Manufacture of fuse heads
US3945320A (en) * 1973-07-04 1976-03-23 Imperial Chemical Industries Limited Water-resistant fuse-cord
US4099464A (en) * 1976-03-01 1978-07-11 Imperial Chemical Industries Limited Shaped explosive charge casing
PL131379U1 (pl) * 2023-04-04 2024-10-07 Wojskowy Instytut Techniczny Uzbrojenia Zapalnik elektryczny

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4484960A (en) * 1983-02-25 1984-11-27 E. I. Du Pont De Nemours And Company High-temperature-stable ignition powder
DE4435319A1 (de) * 1994-10-01 1996-04-04 Temic Bayern Chem Airbag Gmbh Anzündeinheit für einen Gasgenerator eines passiven Rückhaltesystems
CN101936691A (zh) * 2010-09-17 2011-01-05 新疆天河化工有限公司 可主动销毁的震源药柱

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2759417A (en) * 1950-11-06 1956-08-21 Olin Mathieson Electric blasting cap and perforating gun containing said cap

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2759417A (en) * 1950-11-06 1956-08-21 Olin Mathieson Electric blasting cap and perforating gun containing said cap

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3358600A (en) * 1966-01-13 1967-12-19 Trojan Powder Co Self-destroying explosive cartridge for underwater seismic exploration
US3322066A (en) * 1966-02-08 1967-05-30 Trojan Powder Co Self-destructive explosive cartridge for underwater seismic exploration
US3348483A (en) * 1966-03-16 1967-10-24 Re Lo Mfg Co Can for explosive charge
US3430566A (en) * 1966-03-18 1969-03-04 Ici Ltd Marine seismic detonator
US3358601A (en) * 1966-06-29 1967-12-19 Hercules Inc Initiator systems
US3374736A (en) * 1966-08-02 1968-03-26 Du Pont Water desensitized water work boosters
US3372640A (en) * 1966-08-03 1968-03-12 Du Pont Water-desensitized blasting caps
US3356024A (en) * 1966-11-09 1967-12-05 Hercules Inc Self-disarming electric blasting caps and assembly containing same
US3415189A (en) * 1967-03-24 1968-12-10 Atlas Chem Ind Water destructible electric match
US3415188A (en) * 1967-03-31 1968-12-10 Atlas Chem Ind Sea water destructible booster assembly
US3451341A (en) * 1967-09-22 1969-06-24 Hercules Inc Booster structure
US3727512A (en) * 1969-03-13 1973-04-17 Zeebrugge Forges Sa Process for the surface treatment of non metallic cases such as cartridges, and the so treated cases
US3865008A (en) * 1970-02-04 1975-02-11 Arwyn Theophilus Thomas Manufacture of fuse heads
US3945320A (en) * 1973-07-04 1976-03-23 Imperial Chemical Industries Limited Water-resistant fuse-cord
US4099464A (en) * 1976-03-01 1978-07-11 Imperial Chemical Industries Limited Shaped explosive charge casing
PL131379U1 (pl) * 2023-04-04 2024-10-07 Wojskowy Instytut Techniczny Uzbrojenia Zapalnik elektryczny

Also Published As

Publication number Publication date
GB1033793A (en) 1966-06-22
ES313756A1 (es) 1966-03-01
DE1247917B (de) 1967-08-17
AT260081B (de) 1968-02-12
FR1438690A (fr) 1966-05-13

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