Devices of determining pipes

A device of determining pipes, comprising:

• a memory unit, configured to store a plurality of pipe names, a plurality of reference pipe outside diameter values and orders of the plurality of pipe names corresponding to the plurality of reference pipe outside diameter values, wherein the orders of the plurality of pipe names are obtained by inputting the plurality of reference pipe outside diameter values into outside diameter value probability function which is established according to mean outside diameters and outside diameter tolerances of the plurality of pipe names to obtain match probabilities, and sorting the plurality of pipe names corresponding to the plurality of reference pipe outside diameter values according to the match probabilities from high to low;
• a processing unit, connected to the memory unit, configured to receive an outside diameter measuring data of a pipe, compare the outside diameter measuring data with the plurality of the reference pipe outside diameter values, select the order of the plurality of pipe names corresponding to the reference pipe outside diameter value same as the outside diameter measuring data, and generate at least one of the pipe names that match the outside diameter measuring data according to the order of the plurality of pipe names corresponding to the reference pipe outside diameter value same as the outside diameter measuring data;
• a communication interface, connected to the processing unit, configured to output the pipe name that matches the outside diameter measuring data;
• and
• an outside diameter measuring unit, connected to the processing unit, and having a sensor and a clamp;
• when the clamp holds an outer surface of the pipe, the sensor can measure a curvature or the outside diameter of the pipe to generate the outside diameter measuring data.