Abstract: Geophones are placed around pipelines to detect third parties, e.g., heavy construction vehicles. Associated computer equipment acquires data from the geophones and discriminates for the frequencies associated with heavy construction vehicles.

Abstract: A hydrophone mount for use in a marine seismic cable having a central core, such mount comprising: a first housing portion having first and second apertures, first and second edges, and a cavity adapted for holding a hydrophone; a second housing portion having first and second apertures and first and second edges, the first and second housing portions being sized and shaped so that the first and second housing portions can be positioned adjacent to the core to form a housing around the core with the first edge of the first housing portion interlocking with the first edge of the second housing portion, the second edge of the first housing portion interlocking with the second edge of the second housing portion, and the first and second apertures of the first housing portion axially aligning respectively with the first and second apertures of the second housing portion; and a first member positioned in the aligned first apertures and a second member positioned in the aligned second apertures.

Abstract: A hydrophone assembly for use in a marine streamer cable comprising a housing adapted to be mounted in the cable, such housing having a cavity containing a moldable material, an acoustic energy transducer positioned in the moldable material and a rigid body positioned adjacent to the housing such that the rigid body covers a portion of the cavity.

Abstract: A marine seismic cable comprising a cable core, a housing adapted for holding an acoustic energy transducer, and a body of elastic material positioned between the cable core and the housing.

Abstract: A hydrophone mounting in a cavity of the hydrophone cable and a method of mounting the hydrophone. The cavity which is provided in the hydrophone cable may be constructed so that it is free-flooding, that is, the construction allows the liquid in which the hydrophone cable is submerged to completely surround the hydrophone. The cavity serves to insulate the hydrophone from movements and perturbations to the cable so that the hydrophone response is not distorted by these sources of noise.

Abstract: Basic sediment and water content of crude oil flowing through a pipeline is measured by removing a representative sample of the crude oil, heating the sample, and centrifuging the sample to separate the water from the oil. The vapor pressure in the centrifuge is controlled to prevent the escape of any water which has been vaporized by the heating step. The water fraction is passed to a condenser to condense whatever water was vaporized during the heating. Following the condensing step, the water flows into a measuring vessel and is measured.

Abstract: A marine seismic cable comprising a core; a housing coupled to the core and having a cavity adapted for holding a hydrophone, the cavity being located on a first side of the housing; elastic material positioned in the cavity and extending beyond the boundary of the cavity, a hydrophone positioned in the elastic material in the cavity; and a rigid plate positioned adjacent to the elastic material.