What Is a Ductile Iron Flange?

Ductile iron pipe is made of magnesium or rare earth magnesium combined with gold nodulizing agent added to the molten iron before pouring to spheroidize graphite and reduce stress concentration, so that the pipe has high strength, high elongation, impact resistance, corrosion resistance, good sealing, etc. Advantages of pipe fittings; the inner wall is lined with cement mortar, which improves the water delivery environment of the pipeline, improves the water supply capacity, and reduces energy consumption; the pipe mouth uses a flexible interface, and the pipe itself has a large elongation rate, which makes the pipe flexible. In the buried pipeline, it can work together with the soil around the pipeline to improve the stress state of the pipeline, thereby improving the reliability of the pipeline network operation. Therefore, China's water supply industry usually uses ductile iron pipe as the main component.

Ductile iron pipe fittings

Ductile iron pipe is made of magnesium or rare earth magnesium combined with gold nodulizing agent added to the molten iron before pouring to spheroidize graphite and reduce stress concentration, so that the pipe has high strength, high elongation, impact resistance, corrosion resistance, good sealing, etc. Advantages of pipe fittings; the inner wall is lined with cement mortar, which improves the water delivery environment of the pipeline, improves the water supply capacity, and reduces energy consumption; the pipe mouth uses a flexible interface, and the pipe itself has a large elongation rate, which makes the pipe flexible. In the buried pipeline, it can work together with the soil around the pipeline to improve the stress state of the pipeline, thereby improving the reliability of the pipeline network operation. Therefore, China's water supply industry usually uses ductile iron pipe as the main component.

Chinese name

Ductile iron pipe fittings

Foreign name

DUCTILE IRON FITTING

Features

High elongation, impact resistance, corrosion resistance

Category

Fittings

Scope of application

Water supply industry, drainage industry, sewage industry

The buried depth of the pipeline shall be determined according to the freezing degree, the external load and the intersection of other pipelines. Under normal circumstances, the buried depth can be 0.2 meters below the freezing line and meet the following conditions: when the pipe diameter is greater than 100mm, the minimum buried depth at the top of the pipe is 1.20 meters.

The bottom width of the designed groove is generally the outer diameter of the pipe plus 0.5 meters, and the slope of the excavation is determined according to the soil conditions. (I) Ductile iron pipes, like other pipes, have the same head loss along the way as hf = / dv2 / 2g. The only difference is "" (hydraulic friction coefficient), that is, the head loss can be calculated according to the local resistance loss of the original cast iron pipe.

The emergence of nodular cast iron pipe has provided a new type of pipe with excellent performance for China's water supply industry. In order to better apply ductile iron pipes in engineering, design and construction personnel should be familiar with the characteristics of ductile iron pipes, and constantly find problems and solve them, so that the design is more reasonable, the construction is more standardized, and the new type of pipes will be more effective in water supply projects. Great effect.

Strong corrosion resistance, good pressure and bending resistance, convenient joints, no odor and harm to health through water

1. Due to the use of flexible joints for ductile iron pipe fittings, the construction operation is more convenient, which can improve construction efficiency, improve construction conditions, and reduce construction costs. Moreover, most of the interfaces are connected by rubber rings, which is easy to operate and can shorten the construction period and reduce the construction cost.

2. Ductile iron pipe fittings withstand high water supply pressure, can resist external loads and adapt to changes in geological conditions.The pipes have the advantages of high strength, good toughness, corrosion resistance, easy installation of flexible interfaces, strong earthquake resistance, low labor intensity, etc., and are applicable. It is suitable for coastal areas and saline-alkali areas because of poor geological conditions and crossing highways, without the need for additional processing of steel pipes, coupled with strong corrosion resistance. It is widely used in underground pipeline engineering. Large-scale pipeline installation projects can better reflect the advantages of convenient installation and low labor intensity.

3. Ductile iron pipe fittings have good sealing performance and are not easy to leak, which can reduce the leakage rate of the pipe network and reduce the daily maintenance costs of the pipe network.

The following is the preparation before installing ductile iron pipe fittings:
I. Complete the contents of the foundation engineering design and complete the following tasks:
(1) The basic control line and the basic bottom elevation line have been marked;
(2) The composite foundation and pile foundation are qualified by the testing unit;
(3) An approval document is required for the foundation treatment plan.
2. The construction unit checked the project quality after the foundation project was completed, and confirmed that the project quality complies with relevant laws, regulations and mandatory standards for construction, and meets the requirements of design documents. Construction project quality construction unit (foundation) report;
Third, the supervision unit performed a quality assessment of the foundation project, with complete supervision information, and submitted a Tianjin construction project foundation acceptance supervision evaluation report that was reviewed and signed by the chief engineer and the relevant person in charge of the supervision unit;
4. The survey and design unit inspected the survey and design documents and the design change notice signed by the design unit during the construction process, and proposed that the quality of the project survey and design person in charge and the person in charge of the survey and design unit review the quality of the signature. Inspection report, engineering quality inspection report of survey unit, engineering unit quality inspection report of design unit;
V. Have complete technical archives and construction management data, and meet the quality data archiving requirements of Tianjin Construction Engineering Quality Supervision and Management Station;
6. The district planning and construction management bureau and the district construction engineering quality supervision station entrusted by it have ordered all the rectification issues to be rectified.