In order to meet the use requirements, the manhole cover of nodular cast iron shall be inspected before leaving the factory. The inspection content generally includes appearance, size, thickness and other aspects. Only the manhole cover meeting the use performance requirements can be circulated in the market, and the unqualified products can not be sold. The following is the inspection content introduced to you before leaving the factory.
1. From the appearance, the surface pattern of the ductile iron manhole cover must be clear and the handwriting must be clear. Secondly, a special flatness detection tool can be selected to detect the flatness of the manhole cover.
The size of nodular cast iron well cover shall meet the specified requirements to ensure that the purchased well cover size and wellhead diameter are within a certain range.
The thickness of manhole cover shall be determined according to the load requirements。 The manufacturer's manhole covers shall also be pressure tested to ensure that the pressure load of the bearings complies with international standards。
For the ductile iron well cover, it is a very important indicator of whether the product quality is qualified, so the test is necessary. In the process of test, we must pay attention to mastering the correct test method, only test the qualified products, to ensure that the subsequent use effect is not affected, and you want to improve the test.
The above is a detailed introduction to the inspection of Shandong ductile iron manhole cover before delivery。 To learn more, please click http://www。jnwszy。com