API620: Issues with two manholes
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Bosses, one of the requirements in API620 is that there must be no fewer than two manholes, but it doesn’t specify their location. Do these two manholes have to be at the bottom of the tank? Include those on the top of the tank as well.
Study*study*, can you point out which clause it is? Usually one at the bottom and one at the top; the one at the top is used for ventilation and lighting ； But sometimes there are two manholes at the bottom, one on each side; this is especially the case with devices that have a relatively large diameter, and it may be done to ensure proper ventilation