Multilevel sampling apparatus for storage tank

The utility model discloses a multi-stage sampling device of a storage tank used in petroleum and chemical industry, which is particularly applicable to the storage tank in the work places, such as a crude oil metering station, an oil gathering station, an oil depot and the like in the oil gathering and transportation engineering for collecting the liquid sample from storage tank. The multi-stage sampling device of the storage tank comprises a sampling pipe installed in the storage tank; wherein, the sampling pipe is communicated with the sampling mechanism installed at the outer bottom of the storage tank. The sampling mechanism outside the storage tank is controlled to collect the liquid sample at different layer stages in the storage tank. The multi-stage sampling device is adopted to collect the liquid sample at different layer stages at the outer bottom of the storage tank according to the requirement, the sampling by climbing the tank is avoided, and the safety and quickness are achieved. The sampling accuracy is high; as the accumulated liquid sample in the sampling pipe can be drained back into the storage tank, the waste and handling work caused by the drainage of the accumulated liquid sample is avoided, and the liquid sample reflection parameters are ensured to be real and creditable.