1 inspection covers: must be strictly in accordance with the corresponding national standard test.
2 ductile iron manhole cover appearance: there is no obvious casting defects, casting pattern is clear。
Pingdu 3 ductile iron manhole cover: check when you can use special tools for inspection。
4 ductile iron manhole cover bearing load: the sampling inspection method, use the press pressure test experiment, if confined ductile iron covers for 360KN or 210KN should be qualified.
5 inspection: check the diameter when the diameter of the ductile iron manhole cover, should be carried out by special tools, the ductile iron covers Zhijiang control after the range covers the size, depth of 40mm, when the detection of bolt holes shall use special inspection by inspection。
6 detection of nodular cast iron manhole cover paint effect。
The combined effect of 7 detection of nodular cast iron manhole covers, guarantee in ductile iron manhole cover installation does not appear after the shaking and noise, with the manhole cover and the manhole frame not exceeding 1 mm.
This article from the Shandong ductile iron manhole cover to provide you, our website is: http://www。jnwszy。com we will provide higher quality service to serve the enthusiasm for you, welcome your visit!