What is the latest inspection standard of ductile iron manhole cover

Bo tou tianlong casting ductile iron manhole cover should be put into market, or the user needs to carry out certain inspection before purchase. Why do you say that? This is because bo tou tianlong casting is in production, there is no guarantee that every product can be perfect, so we need to test to make sure that its security can be used properly, and what is the test standard? As follows:

Bo tou tianlong casting ductile iron manhole cover

1. Work appearance: no obvious casting defect, clear pattern and clear handwriting.

2, pingdu inspection: the use of special jig check cover pingdu, create a product size diameter, 37 mm, the depth of the size and become, through processing and nodular cast iron manhole cover fixture, can have no vibration and noise, the manhole covers shall not be higher than ground, 3 mm in depth (37 mm) fit clearance.

3. Sampling method for load bearing load: in the test stress test, cap pressure is 360KN or 210KN, and the qualified batch is confirmed.

4, well test, the appearance, no obvious casting defects, using a special tool to detect circle diameter, hole diameter control in ductile iron manhole covers, depth of 40 mm, bolt holes, using a special fixture for inspection.

5, cooperation, and spray paint detection: T aprons and round, apron in T slot should be flat, not long or short, strong adhesion, fit clearance is not greater than 1 mm, manhole cover and shaft frame assembly is flat, no vibration, no noise, the cover and the box does not exceed 1 millimeter, T apron stick firmly, and then spray paint, manhole cover (round) spray evenly, no rusty spot.

6, inspection Wells, and USES the stay ring groove placed T glue, rubber ring, prevent the running of the cover, jump, the ring, increased nodular cast iron manhole covers and bearing ring surface area of the mouth, contact, the scale increases, so as to eliminate the phenomenon of running, jumping, the cover of the ring. Displacement detection, in order to prevent the wellhead inspection Wells of outer ring set three 120 - degree distribution of bolt, through embedded rivet head bolt, so it can avoid the hole in the road displacement in the process of rolling ring, improve the performance of Wells of guard against theft, including surface using cross edge triangle mode, can effectively prevent slippery effect.

We, too, when buying nodular cast iron manhole cover also need to test, to ensure that we buy the products can be normal use, more quality assurance, so we must learn to inspection standards.