Ductile iron pipe Details
For more information about the properties of ductile iron pipe, ductile iron pipe, ductile iron pipe advantages and disadvantages of standard ductile iron pipe, ductile iron pipe sizes, ductile iron pipe corrosion protection and other anti-c
Ductile iron pipe Details
Ductile iron pipe Details
Use more than 18 cast iron ball after adding agent, through high-speed centrifugal machine centrifugal ductile cast pipe, called "ductile iron pipe" (Ductile Cast Iron Pipes), referred to as the tube, ductile iron pipe and ductile iron pipe and so on. Mainly used for water transportation, it is the ideal choice for water pipe materials.
Ductile iron pipe Introduction
The main component of ductile iron pipe carbon, silicon, manganese, sulfur, phosphorus and magnesium. Implementation of the standards [span] GB / T13295-2003 ISO2531 / 2003
Ductile iron pipe is defined using a No. 18 or more cast iron ball after adding agent, through high-speed centrifugal machine centrifugal ductile cast pipe, said
Ductile iron pipe ([span] Ductile Cast Iron Pipes), referred to as the tube, ductile iron pipe and ductile iron pipe and so on.
Ductile iron pipe Features
Ductile iron pipe is a cast iron pipe. Requirements on the quality of cast iron pipe ball grade control 1-3 (ball rate> 80%), and thus the mechanical properties of the material itself has been good improvement, with the nature of iron, steel performance. Annealed ductile iron pipe, the microstructure of ferrite and pearlite, good mechanical properties, excellent corrosion resistance, ductility, good sealing effect, easy to install, mainly used for municipal, industrial and mining water, gas , oil and so on.
On the ferrite and pearlite matrix distribution of a certain number of spherical graphite of different caliber and elongation requirements based on the nominal ratio of the matrix structure of ferrite and pearlite is different, small-diameter ratio of pearlite generally not more than 20% of large diameter generally controlled at about 25%.
Mechanical properties of ductile iron pipe
Minimum tensile strength: 420 / Mpa, minimum yield strength: 300 / Mpa, minimum elongation of 7%
GB / T13295-2008 ISO2531-2009
Diameter: DN80-DN2600
Advantages and disadvantages of ductile iron pipe
advantage
In the low-voltage network (generally used 6MPa or less), ductile iron pipe with a safe and reliable operation, easy breakage rate, construction maintenance, fast, excellent anti-corrosion properties. "Rock Shield" series of newly developed pipeline may be applied to non-excavation and construction, it is widely used in the river, through the road, through the building of the pipeline construction. "Out Zinc" series of pipes using special zinc-aluminum alloy outer coating process, several times to improve the corrosion resistance of the pipe, widely used in corrosive soil construction.
Shortcoming
Generally do not use high-pressure pipeline network (6MPa above). Due to the relatively bulky tube, you must use mechanical installation. After pressure testing leaking, you must put all the pipes all dug, the pipe can be lifted to a height into the clamp, the clamp is installed to prevent leaking.
Ductile iron pipe works Points
1. Trench excavation
Trench bottom width should be counted under the formula: B = D1 + 2 (b1 + b2)
Where: B- pipeline excavation trench bottom width (mm) width of the outer edge of the pipe structure D1- (mm) b1- pipeline Face side Width (mm) b2- piping side support width (mm)
2. Trench support
According to factors trench soil, groundwater, slotted section, load conditions, such as design, require a solid and reliable, prevent landslides, support shall not impede the down tube and pipe steady.
3. T-joints of the pipes in a vertical or horizontal direction should be located at the corner buttress. Buttress size should be determined based on the calculated diameter, angle, work pressure and other factors.
4. When transporting drinking water, poison pipeline should pass through the contaminated area, such as the need to be taken through the protective measures.
5. Where ductile iron pipe socket connection must be calculated to set Buttress.
6. External anti-corrosion coating of ductile iron pipe cladding tube should be based on the land and soil conditions to choose the galvanized coating epoxy asphalt coating or higher required.
7. Pipeline installation, pressure test after passing the low chloride water rinse is preferred and 0.03% potassium permanganate solution disinfection.
Ductile iron pipe standards
GB / T 13295-2013 water and gas pipes with ductile iron pipes, fittings and accessories
GB / T 17457-1998 ductile iron pipe centrifugal cement mortar lining - General requirements
Component test GB / T 17458-1998 ductile iron pipes - Centrifugal cement mortar lining of fresh mortar
GB / T 17459-1998 ductile iron pipe bitumen coating
GB / T 17456 ductile iron pipe outer zinc spray
GB / T 17219-1998 drinking water distribution equipment and protective materials safety evaluation of
Ductile iron pipe selection recommendations
Choose one pair of ductile iron pipes should be laid according to the specific circumstances, select the interface in the form of a straight pipe and fittings.
2 rubber ring is usually used NBR, SBR, EPDM and other materials.
3 coating selection: According to internal use, and select the appropriate external conditions and coating. Within the existing coating is an epoxy resin, a polyurethane coating inside and outside, PE film coatings and other new products, ductile iron pipe, should be selected to learn more about its performance.
Ductile iron pipe sizes
DN DE T
DN DE T
Ductile iron pipe performance
Ductile iron pipe is a cast iron is an alloy of iron, carbon and silicon. Ductile iron is spheroidal graphite form, usually graphite size of 6-7, requires casting on the quality control of the ball grade 1-3 (ball rate ≥80%), and thus the material itself machinery improved performance has been good, with the nature of iron, steel performance. Annealed ductile iron pipe, the microstructure of ferrite and pearlite, good mechanical properties.
Ductile iron pipe is mainly known as ductile iron pipe, which has the nature of iron, high performance, corrosion resistance of steel, ductility, good sealing effect, easy to install, mainly used for municipal, industrial and mining water, gas, transport oil. Is the preferred water supply pipe, with a high cost. Compared with PE pipe, from the time of installation, ductile pipe is simpler than the PE pipe installation quick and better internal and external bearing pressure after installation; from tightness and corrosion resistance point of view, ductile pipe tightness better after installation, but also through a variety of means to improve the anti-corrosion resistance; from hydraulic performance point of view, due to ductile pipe specifications generally refers to the inner diameter, PE pipe specifications generally refers to the diameter, the same size as under conditions of ductile pipe can achieve greater runoff; from comprehensive installation and maintenance cost, the ductile pipe has a more favorable price. The inner wall of spray zinc, cement mortar anti-corrosion materials.
Ductile iron pipe anti-corrosion treatment
1.Asphalt lacquer coating
Asphalt paint coating is used to transport the gas pipeline. Preheat the pipe before painting can improve the adhesion of asphalt paint to accelerate the drying.
2. cement mortar lining + special coating
This anti-corrosion measures applicable to piped water can improve the anti-corrosion lining.
3. The coal tar epoxy coating
Coal tar epoxy coating both for gas pipelines, also apply to the sewers. It is a two-component coating which has a high adhesion and a very smooth surface
4. The ceramic epoxy lining
Ceramic epoxy lining applicable to sewers and gas pipelines, but because the manufacturing process is difficult and costly, so there are some limitations on use. Ceramic Epoxy lined with high adhesion and smooth finish, is an excellent anti-corrosion coating.
5. aluminate cement or sulfate cement coat coating
Both are suitable for special cement coating sewers with ductile iron pipe anti-corrosion and improve corrosion resistance to acid-base wastewater constituents.
6. The polyurethane coating
In order to meet environmental requirements is a research and development of a new type of green special coating with good abrasion and corrosion resistance.
Contact：Lucky
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E-mail：jinxiaolong0221@gmail.com
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Cangzhou Beite steel pipe CO., LTD is a Chinese wholesaler that export to global markets.
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