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Ductile iron pipe fittings characteristic and prepare matters before installation

by:XEX     2020-12-11
Ductile iron pipe is used in modern industry or building is in a class of material, compared with the ordinary cast iron parts, due to take part in the graphite material, the progress of the useful material toughness and strength, comprehensive can be reached with steel. Ductile iron pipe is made by metal casting and molding, liquid metal in the casting process, should be careful some topic, in order to produce ductile casting quality is better, more higher toughness and strength. And deal with nodular cast iron pipe fittings production material, meticulous also lies in its strength, if there is no strength to reach requirement, one can make it in product performance is low, moreover also depressed they use compliance, there is another aspect, has polluted the product to reach good toughness requirements. Only it reached better toughness, in the use of time, better reflects the performance of the upper hand, a product of this kind in the use of time, often a sign of will be broken, it is also due to not reach requirement, in terms of toughness in the end one aspect, is also associated with its use life, also is must have reached very good abrasion resistance. In the course of casting, we usually is to follow the rule of high temperature melt and low temperature pouring, the pouring method can probably the mixture of wider melting, is advantageous to the buoyancy of the molten slag, stopped in casting slag, porosity, etc, affect the quality of the casting, also is advantageous to the slag removal and degassing. So in order to better guarantee the quality of the castings, guarantee high quality of production, we in the detailed process of the ductile casting pouring of incident to comply with the following principles. 1, before using, we need to ensure inoculant, nodulizing agent and so on a series of casting before use hold sufficient drying agents. 2, master the accurate rate of casting, first slow, quick, both reduced the molten metal to the blow of sand mold, facilitate the crowd out of the gas, and stop signs appear cold-lap, harsh in accordance with the principle of slow, fast and slow. 3, deal with liquid and consolidation contraction than force between, necessary after pouring in real time from the gate or riser hold water. Ductile iron pipes before installation: one, complete various contents of foundation engineering design, complete the following work: (at the same time 1) Has mark the base line and base bottom elevation lines; ( 2) Composite foundation, pile foundation and other qualified through inspection unit; ( 3) Foundation treatment schemes, approval documents are required. Second, after the completion of the construction units in the foundation engineering for the engineering quality inspection, confirm the project quality conform to the relevant laws, regulations and the mandatory project construction standards and conform to the requirements of the design documents, and put forward by the project manager and construction unit responsible person in respect of construction project audit quality construction unit ( The foundation) Report; Three on the foundation engineering quality evaluation, supervision unit, complete with supervision information, and puts forward the general supervision engineer and supervision unit responsible person in respect of tianjin construction engineering foundation acceptance supervision audit evaluation report; Four, survey, design units in the process of survey, design documents and construction design change notice signed by the design unit, and put forward by the project survey, design and survey and design units, head of the responsible person in respect of quality audit inspection report, survey unit engineering quality inspection report, design unit engineering quality inspection report; Five, have complete technical documents and construction management data, and meet the quality of construction engineering quality supervision station of tianjin data archiving requirements; Six district, district planning and construction bureau and entrusted construction quality surveillance shall be ordered to make correction problem all the rectification is completed.
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