Four, ductile iron pipe pipe installation should have first: the condition of construction design drawings and other technical documentation is complete, and by the came or review;
Second: the construction scheme and construction organization design has been technical clarificaiton;
Third: materials, construction personnel, construction machines and tools and can guarantee the normal construction;
Fourth: water and electricity construction site site conditions and the material can meet the needs;
Fifth: provide pipes, pipe fittings and accessories in accordance with the current enterprise standard, its physical and consistent data, along with product manuals and quality certificate.
Five, the ductile iron pipes anticorrosive processing. 1.
Bituminous paint coating bituminous paint coating is used for conveying gas pipeline.
Spray paint on the pipe before preheating can improve the adhesion of asphalt paint, accelerate drying.
Cement mortar lining + within this particular coating is suitable for transporting sewage pipeline anticorrosion measures, can improve the corrosion resistance of lining.
Epoxy coal tar coating epoxy coal tar coating was applied to gas pipeline, can also be applied to sewage pipe.
It is a kind of two-component coating, the coating has good adhesion and 4 very smooth surface.
Epoxy ceramic lining of ceramic epoxy lining applied to sewage pipeline and gas pipeline, but due to the manufacturing process is difficult, the cost is high, so there are some limitations on use.
Epoxy ceramic lined with high adhesion and bright and clean degree, is a kind of excellent corrosion resistant coating.
Aluminate cement and sulfate cement coating of these two kinds of special cement coating are suitable for sewage pipe with the ductile cast
iron pipe corrosion protection, improve the erosion ability of resistance to acid-base components in sewage.
Polyurethane coating is a kind of special coating, a kind of high grade coating and execution of nodular cast iron pipe standard centrifugal ductile cast iron pipe with iron, the nature of the performance of the steel, anticorrosive performance, can good ductility, good sealing effect, easy to install, mainly ductile cast iron pipe used in municipal, industrial and mining enterprises, water supply, gas, oil, etc.
Is the first selection of water supply pipe, has the very high cost performance.
Compared with PE pipes, from the installation time, ductile pipe than PE pipe installation is more simple and quick, and installed inside and outside the bearing pressure is better;
From the perspective on the impermeability and corrosion, ductile pipe installed in sealing better, also can improve the anti-corrosion performance through many kinds of anti-corrosion measures;
From the point of hydraulic performance, because generally refers to the inner diameter ductile pipe specification, PE pipe specifications generally refers to the outer diameter, because under the condition of the same specification, ductile pipe can achieve greater runoff;
From the point of comprehensive installation and maintenance cost, ductile pipe has more superior performance.
The main composition of nodular cast iron pipe with carbon, silicon, manganese, sulfur, phosphorus and magnesium.
Wall spray zinc, cement mortar anti-corrosion materials.
In ferrite and pearlite matrix distribution has a certain number of nodular graphite, according to the requirement of the nominal diameter and elongation of different, the proportion of ferrite and pearlite in the matrix organization is different, small diameter of pearlite proportion is generally not more than 20%, the general control of large diameter is about 25%.
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