Installation of oil level measurement ports in petrochemical storage tanks

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According to the requirements of the \"Design Code for Tank Areas in Petrochemical Storage and Transportation Systems\" SHT3007, \"5.1.1 Floating roof tanks and internal floating roof tanks shall be equipped with sight glasses and manholes...\", which means that floating roof tanks must have sight glasses as well as sight glass guides. \"5.1.2 Fixed-roof storage tanks should preferably be equipped with sight glasses and light-transmitting holes...\", does this mean that fixed-roof storage tanks do not need to have sight glasses? Because the function of an oil measurement hole is generally to facilitate manual gauge reading, temperature measurement, volume calculation, sampling, etc. If a storage tank is equipped with sampling ports, thermometers, level gauges and other accessories, then a fixed-roof storage tank does not need to have an oil measurement hole, right? Generally, the storage tanks that are in use these days come equipped with oil level measurement holes, right? So is it necessary to have oil level measurement holes on fixed-roof storage tanks? Also, is there any other function to the setting of the oil measurement hole?