GINDIN: продукция Bridon-Bekaert (Брайдон) в России

63 BRIDON Oil and Gas Steel Rope Technical Information Multiple operation lay strand: Strand construction containing at least two layers of wires, at least one of which is laid in a separate operation. All of the wires are laid in the same direction. Cross-lay: Multiple operation strand construction in which the wires of superimposed wire layers cross over one another and make point contact, e.g. 12/6-1. Compound lay: Multiple operation strand which contains a minimum of three layers of wires, the outer layer of which is laid over a parallel lay centre, e.g. 16/6+6-6-1. Ropes Spiral Rope: An assembly of two or more layers of shaped and/or round wires laid helically over a centre, usually a single round wire. There are three categories of spiral rope, viz. spiral strand, half-locked coil and full-locked coil. Spiral Strand: An assembly of two or more layers of round wires laid helically over a centre, usually a single round wire. Half-locked Coil Rope: A spiral rope type having an outer layer of wires containing alternate half lock and round wires. Full-locked Coil Rope: A spiral rope type having an outer layer of full lock wires. Stranded Rope: An assembly of several strands laid helically in one or more layers around a core or centre. There are three categories of stranded rope, viz. single layer, multi-layer and parallel-closed. Single Layer Rope: Stranded rope consisting of one layer of strands laid helically over a core. Note: Stranded ropes consisting of three or four outer strands may, or may not, have a core. Some three and four strand single layer ropes are designed to generate torque levels equivalent to those generated by rotation-resistant and low rotation ropes. Rotation-resistant Rope: Stranded rope having no less than ten outer strands and comprising an assembly of at least two layers of strands laid over a centre, the direction of lay of the outer strands being opposite (i.e. contra - lay) to that of the underlying layer of strands. Low Rotation Rope: Rotation resistant rope having at least fifteen outer strands and comprising an assembly of at least three layers of strands laid over a centre in two operations. Note: this category of rotation resistant rope is constructed in such a manner that it displays little or no tendency to rotate, or if guided, generates little or no torque when loaded. Compacted Strand Rope: Rope in which the outer strands, prior to closing of the rope, are subjected to a compacting process such as drawing, rolling or swaging. Note: Bridon’s products containing compacted strands are identified by “Dyform”. Strands Strand: An element of rope usually consisting of an assembly of wires of appropriate shape and dimensions laid helically in the same direction in one or more layers around a centre. Note: Strands containing three or four wires in the first layer or certain shaped (e.g. ribbon) strands may not have a centre. Round strand: A strand with a cross-section which is approximately the shape of a circle. Triangular strand: A strand with a cross-section which is approximately the shape of a triangle. Note: Triangular strands may have built-up centres (i.e. more than one wire forming a triangle). Oval strand: A strand with a cross-section which is approximately the shape of an oval Flat ribbon strand: A strand without a centre wire with a cross-section which is approximately the shape of a rectangle. Compacted strand: A strand which has been subjected to a compacting process such as drawing, rolling or swaging whereby the metallic cross-sectional area of the wires remains unaltered and the shape of the wires and the dimensions of the strand are modified. Note: Bridon’s brands of Dyform rope contain strands which have been compacted. Single lay strand: Strand which contains only one layer of wires, e.g. 6-1. Parallel lay strand: Strand which contains at least two layers of wires, all of which are laid in one operation (in the same direction), e.g. 9-9-1; 12-6F-6-1; 14-7+7-7-1. Each layer of wires lies in the interstices of the underlying layer such that they are parallel to one another, resulting in linear contact. Note: This is also referred to as equal lay. The lay length of all the wire layers are equal. Seale: Parallel lay strand construction with the same number of wires in each wire layer, each wire layer containing wires of the same size, e.g. 7-7-1; 8-8-1; 9-9-1. Warrington: Parallel lay strand construction having an outer layer of wires containing alternately large and small wires, the number of wires in the outer layer being twice that in the underlying layer of wires, e.g. 6+6-6-1; 7+7-7-1. Filler: Parallel lay strand construction having an outer layer of wires containing twice the number of wires than in the inner layer with filler wires laid in the intersticeswires of the underlying layer of wires, e.g. 12-6F-6-1; 14-7F-7-1. Combined parallel lay: Parallel lay strand construction having three or more layers of wires, e.g. 14-7+7-7-1; 16-8+8-8-1; 14-14-7F-7-1; 16-16-8F+8-1. Note: The first two examples above are also referred to as Warrington-Seale construction. The latter two examples are also referred to as Seale-Filler contruction. Rope Terminology