Gaging hatch is a special accessory used to measure the oil level in tank and to collect oil samples. There is one on the top of each tank, mostly near the ladder platform. It is equipped with a sealed hole cover and a tightening bolt. In order to prevent sparks caused by the impact between the hole cover and the ironware when closing, an oil-resistant rubber pad or soft metal (copper or aluminum) is embedded in the sealing groove of the hole cover. Because the steel tape used for measuring is easy to produce sparks by friction at the contact outlet, copper (or aluminum) sleeves are inserted inside the hole tube or non-ferrous metal guide grooves (ruler grooves) which do not generate sparks are installed outside the fixed measuring points.
In order to ensure that the measurement error is reduced by lowering the ruler along the same position every time when measuring oil, a guide groove of aluminum or copper is installed on one side of the inner wall of the oil measuring hole. There should be no welding seam on the bottom plate of oil tank under the oil measuring hole. If necessary, a measuring datum plate can be welded there to reduce the relative error of each measurement. Fires in oil tanks often occur in the position of measuring holes. The main reason is that oil and gas rush out from the tank when the hole cover is opened during the measuring operation. If electrostatic sparks or impact friction sparks occur, the oil and gas will ignite.
1. lock type
2. pedal type
DN
L
H
100
330
190
150
360
210
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