Dredging Hose

State-of-the-art dredging hoses are reinforced with rubber skimmed cords/ rubberized textile sheets. These sheets are applied manually or semi-automatically on the rotating product mandrel. The cords are applied in sheets of approximately 200mm wide, and have parallel spaced cords. To obtain a balanced reinforcement layer, these sheets are applied in pairs of two, which are applied on top of each other in opposite direction, resulting in opposite cord angles (e.g. +/-54 degrees). At the coupling/flange area these sheets are manually cut, secured in place by metal wire hoop winding, and manually folded backwards into position. This is a proven construction method which enables to make good hoses. However, the reinforcement material is not used most efficiently, and the reinforcement construction in the coupling area introduces local stress concentrations and is skill and labor intensive to make.

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TANIQ has developed a new reinforcement design which is based on using single end reinforcement cords instead of textile reinforced sheets. Designing with single end cords instead of textile sheets eliminates the requirement of using paired layers, and enables to freely choose the required number of cords per layer. The optimal position of each cord can be mathematically determined and accurately placed on that exact position using accurate robotic equipment. Having accurate control over the cord positioning also introduces the possibility to optimize the reinforcement construction by optimizing the cord angles within 1 angular degree. Finally, the use of single end cords enables to integrally wind the metal couplings and flanges, eliminating the manual cutting/attaching steps and reducing the stress concentrations. Winding all reinforcement cords on their optimal winding angle with uniform tension results in most efficient material use whereby the cords are loaded on tensile strength. Compared to construction using rubberized textile sheets improvements of 50% material savings have been obtained.

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To obtain high production speeds 16 or more cords can be wound simultaneously. Single end cord is commercially available and is supplied on standard bobbins. TANIQ works together with renown converters to develop the optimal (RFL) cord coating for each product and production process. For obtaining strong adhesion a thin layer of rubber is applied between the cord layers.

Produced in hard and soft-wall constructions, RELONG&#;s Dredging Hose is quality-based with over 30 years of experience in hose design and manufacturing and has the strong research and development ability. Builds cooperation with China best ship design institutes; and RELONG products will be fully tested before delivery. Besides, the production cycle is short, the delivery time is guaranteed. RELONG has built after-sales service team in the main sales areas, which could be ready to supply solutions .

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