Ammunition and explosives – Blasting – Plug
Patent
1994-12-22
1997-09-09
Nelson, Peter A.
Ammunition and explosives
Blasting
Plug
102312, 102313, 72706, F42D 300, B21C 100
Patent
active
056659334
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a device for cladding an outer tube With an inner tube made, for instance, corrosion-resistant material, in which the inner tube is bonded to the outer tube by means of an explosion process.
2. Description of the Related Art
It is known to clad tubes, for instance steel tubes, for transporting oil and gas or other chemical products, with a thin internal tube made of corrosion-resistant material, by means of an explosion process.
Hitherto, it has been necessary to carry out such tube cladding processes in separate firing places, mostly outdoors, due to noise and gases. This results in relatively high transportation and handling costs. Moreover, cladding processes are dependent on weather and wind conditions.
The present invention relates to a device which enables tubes to be clad by explosion processes in a practically noiseless fashion and in a workshop locality.
SUMMARY OF THE INENTION
The present invention thus relates to a device for cladding an outer tube with an inner tube by means of an explosion process, and is characterized in that the device includes an outer tubular fixture in which a workpiece comprising said outer and said inner tube is intended to be placed; in that at least one end of the tubular fixture is connected to an expansion chamber; in that a sealing cap of easily destroyed material is located between the expansion chamber and the workpiece, said sealing cap or caps being intended to retain a liquid pressure transmitter, preferably water, in the inner tube prior to detonation of an explosive substance placed within the inner tube.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will now be described in more detail with reference to exemplifying embodiments thereof shown in the accompanying drawings, in which
FIG. 1 is a schematic axial sectional view of the inventive device;
FIG. 2 illustrates one end of the device in larger scale; and
FIG. 3 illustrates one end of an alternative embodiment of the device.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
FIG. 1 illustrates schematically a device constructed in accordance with the invention. The device includes an outer tubular fixture 1 in which a workpiece 2, 3 comprising an outer tube 2 and an inner tube 3 is inserted. The workpiece also includes one or more explosive charges 4, placed within the inner tube 3. At least one end of the tubular fixture is connected to an expansion chamber 7, 10. The device also includes sealing caps 6 which are made of an easily destroyed material and which are intended to be fitted onto both ends of the workpiece and function to retain a liquid pressure-transmitting medium 5, preferably water, in the inner tube.
The caps 6 may be made of plastic, wood-fibre material or gypsum.
When detonating the explosive substance 4 located within the inner tube, the pressure transmitting medium will transmit a shockwave which causes the inner tube 3 to expand towards the inner surface of the outer tube, said inner tube initially having a slightly smaller outer diameter than the inner diameter of the outer tube 2. Simultaneously the caps 6 will burst. The gas generated and the pressure transmitting medium therewith flow into the expansion chambers 7, 10.
About one cubic meter of gas at normal pressure per kilogram of explosive substance is generated by the detonation. If the tubular fixture were closed at its ends, the pressure generated by the detonation would be extremely high, since the pressure-transmitting medium is incompressible. Because the inventive device includes expansion chambers and destructible caps, the pressure generated as the gases flow out into the expansion chambers will not be particularly high. Naturally, the pressure that prevails after the detonation will depend on the volume of the expansion chambers in relation to the amount of explosive used. Accordingly, the volume of the expansion chambers is conveniently chosen so that the pressure in the expansion vessels will be relatively low after the detonatio
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patent: 3718088 (1973-02-01), Bearden et al.
patent: 4587904 (1986-05-01), Berman et al.
patent: 4672832 (1987-06-01), Merker
patent: 4685205 (1987-08-01), Schroeder et al.
patent: 4860656 (1989-08-01), Hardwick
patent: 4879890 (1989-11-01), Hardwick
patent: 5003880 (1991-04-01), Gut et al.
B Omentum Leasing AB
Nelson Peter A.
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