Medium density polyethylene float is a commonly used floating material for dredger pipelines. It has the advantages of small size, light weight, large buoyancy, wind and wave resistance, aging resistance and long service life.
How to identify good quality medium density polyethylene floats? The following is a detailed introduction to the characteristics of the material, so that you can master the method of identifying the advantages and disadvantages.
The medium-density polyethylene floating body is made of medium-density polyethylene plastic as the outer shell and filled with polyurethane foam plastic. It is a marine floating material used to replace the steel floating ship for floating offshore sludge pipelines. It has a small size, easy installation, and resistance. Wind wave and other advantages have been used abroad for more than 50 years. Since it was introduced to China in 1998, after years of promotion and application, it has been recognized by most dredging companies.
In actual use, the following inspections are also made to the floating body to ensure the normal and safe use of the floating body:
1. The buoyancy of the floating body is generally required to be greater than 30% of the weight of the pipeline itself (including mud with a specific gravity of 1.3). When the pipeline is working, the height of the exposed water surface is 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 ordering parameters, because the weight of the floating body is related to the weight of the floating body shell, and the specific gravity and volume of the floating body foam, too light weight floating body, the strength and strength of the plastic shell The proportion of foam is difficult to guarantee. The specific gravity of the foam should be around 35 kg / m3.
3. The degree of plasticization of the plastic shell of the floating body. Inside the plasticized floating body, the surface should be smooth and smooth without obvious particles. At this time, the plastic shell has the best tensile resistance.
4. The density of filled foam; generally it should be about 35 kg / m3. The tensile strength at this time is about 0.2 MPA. Slightly elastic, non-sticky and brittle are qualified. only the floats that guarantee the above product standards are truly durable and good floats.
5. The welding of the foaming holes of the floating body must be firm, and the welding should be repaired when there are leakage holes.
In summary, the choice of polyethylene buoys must be optimistic about the details, which also determines the construction efficiency of the marine sediment transport work.