Ductile iron pipes standards!
Wall thickness of the ductile iron pipe standard is according to the function to calculate the nominal diameter DN, such as e = K (
5 + 0.
Type, the level of K for wall thickness coefficient, 9, 10.
12 level 4 is the standard wall thickness.
DN for nominal diameter.
Mm, ductile cast iron
pipe diameter of DN (
Mm straight tube with the following additional formula, e = 5.
8 + 0.
003 dn centrifugal ductile iron pipe smaller wall thickness is not less than 6 mm, wall thickness negative deviation of 1.
3 + 0.
That is commonly used in water supply pipeline I shi for K9 grade of pipe wall thickness.
The weight of the ductile iron pipe standard density of the nodular cast iron pipe of 7050 kg/m3.
Weight allowable deviation: nominal diameter 200 mm or less, weight deviation for - allowed
8% of nominal diameter DN>
200 mm, weight deviation for - allowed
The length of the ductile iron pipes commonly used standard is 6 m, socket manufacturing deviation is + 30 mm length of straight pipe, ductile iron pipes should be straight, FM should not be greater than its larger deviation condition. and effective length L of 0.
FM (i. e. ,
The composition of materials of the ductile iron pipe is in ferrite and pearlite matrix distribution with a certain amount of spheroidal graphite.
According to different nominal diameter and elongation, the composition of ferrite and pearlite proportion is different, the roundness of the graphite and size is not the same.
5, 'T' type into type flexible interface of nodular cast iron pipe.
Outside the socket should have white paint on the surface of the insert tag.
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