How should the number of manholes in large storage tanks be determined?
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This post was last edited by gzf7390637lv on 2009-12-16 at 14:00. How should the number of manholes in large storage tanks be determined? The tolerance specifications and Regulation 151 are not clear, and some of the explanations for SH3074 are also unclear. Now the tanks are getting larger; there is one tank with a diameter of 3600 and a tangent length of 7000. The considerations for processing and installation differ – processing suggests that two tanks should be used, while installation indicates that one is sufficient. Let’s talk about it
According to the HG standards, since the length of the cylinder is 6000 MM or more, it is necessary to consider providing two manholes.
It is convenient and reasonable to set two.
It seems that each case needs to be handled individually; various factors such as the medium and size parameters need to be taken into consideration. For the units we’ve built with a capacity of several hundred cubic units, some are equipped with one, while others don’t have one at all. Designers consider standard requirements, while technicians focus on process settings or inspection requirements; there is some inconsistency between the two. But in the end, the standards are still meant to serve operational use; therefore, it’s not difficult to determine the order of priority.
In my opinion: the device is quite large, so two units would be more reasonable
The engineer takes into account the requirements for process settings or inspections, and adopts the suggestions regarding the process
The standard should be two manholes; the installation is done for convenience, to save effort
If the number of manholes isn’t clearly specified, let’s use two!`
With such a large device, having just one setting would likely be inconvenient and unsafe in actual use. 1. In the event of an accident during maintenance, it would be difficult to handle the situation. 2. Maintenance would also be complicated