Handle specifications
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The specification for the handle near the inlet and outlet of the manhole on HG20583 is Φ12, 60 away from the cylinder body； The standard handle specification for manholes is Φ20, at a distance of 75 from the surface. Why is it different? The diameter is easier to understand; since the space is the same, why is it different?
Please note that the appropriate handle for a manhole corresponds to its specific specifications; not all manholes use the same type of handle. To give an example: a manhole designed to handle pressure must be heavier than one that operates at normal pressure, so wouldn’t the handle need to be thicker as well? Hehe
I completely agree with the view expressed above – it’s necessary to analyze each specific case individually. If it’s a standard manhole, it’s best to follow the standard specifications; for non-standard manholes, I would recommend a height of 75 mm and a diameter of at least 16 mm. In the case of ordinary manholes used under normal pressure, a diameter of 8 or 10 mm will suffice! !
The specification for the handle near the inlet and outlet of the manhole on HG20583 is Φ12, 60 away from the cylinder body； ------It is mentioned in HG20583, but this handle is located on the inner wall of the cylinder near the manhole. The standard handle specification for manholes is Φ20, at a distance of 75 from the surface. ————It was not found in the new manhole standards. . . No handle specifications were specified.
There’s no need to worry too much about this issue; as long as the hand can hold the manhole cover without any problems, that’s sufficient
I checked again; the standards for manholes do not specify requirements regarding handle size or distance. However, it can be inferred that the handle size varies depending on the weight of the flange, while the distance is likely to be 75. It seems that the specification Φ20 in my memory is influenced by other catalogs. However, it is also seen that other standards specify a distance of not less than 75. So the final answer to this question is: the handle specification can be determined based on actual conditions, with a distance of 75mm being ideal.