MDPE floating body is a common floating material for dredger pipelines, which has the advantages of small volume, lightweight, high buoyancy, wind and wave resistance, aging resistance, and long service life.
How to identify the good quality of the MDPE floating body? The following is a detailed introduction to the characteristics of the material so that you can master the identification of the advantages and disadvantages of the method.
MDPE floating body is a kind of marine floating material with MDPE plastic as shell and polyurethane foam inside, which is used to float marine mud pipeline instead of steel pontoon with the advantages of small volume, easy installation, wind and wave resistance, etc. It has been used abroad for more than 50 years, and has been introduced to China in 1998, and has been recognized by most dredging enterprises after more than 10 years of promotion and application. The technical data provided by the manufacturers are as follows.
In actual use, the following checks are also made on the floating body to ensure the normal and safe use of the floating body.
1, the buoyancy of the floating body, generally requires more than 30% of the weight of the pipeline itself (including the specific gravity of 1.3 mud), the pipeline in the work, the height of the exposed water surface for about 1/4 of the height of the steel pipe.
2, The overall weight of the floating body: not less than 3-5% of the ordered parameters, because the weight of the floating body is related to the weight of the floating body's shell, and the specific gravity and volume of the floating body foam, the weight is too light for the floating body, the strength of the plastic shell and the specific gravity of the foam is difficult to ensure. The specific gravity of the foam should be about 35kg/m3.
3, the degree of plasticization of the plastic shell of the floating body, plasticized inside the floating body, the surface should be flat and smooth, no obvious granular material. This is when the plastic shell has the best tensile strength.
4, The density of the inner filling foam; generally it should be about 35 kg/m3. The tensile strength at this time is around 0.2MPA. Slightly elastic, not sticky, and not brittle for qualified. Only at the same time to ensure that the above product standards of the floating body are really durable good floating body.
5, The welding of the floating body foam hole must be firm, there should be a leak of the hole to make up the welding.
In summary, the choice of polyethylene floating body must look at the details, which also determines the construction efficiency of the work of offshore sediment transport.
