Piping system for an air conditioner system comprising: a refrigerant pipe that is formed of a plastic material and has a multi-layered pipe structure including an outer layer and an inner layer, and provides a fluid flow between parts constituting the air conditioner system; at least one first flange formed of the plastic material and providing a connection between the refrigerant pipe and components constituting the air conditioner system; and at least one second flange formed of the plastic material; wherein the first flange comprises a hollow body portion; and wherein the first flange is joined by laser fusion in a state in which one end of the refrigerant pipe is coupled; characterized in that the at least one second flange is connected to a charging valve for injecting a refrigerant into the refrigerant pipe, wherein the second flange is joined by laser fusion in a state in which the lower portion of the second flange is seated in close contact with the upper portion of the outer circumferential surface of the refrigerant pipe, wherein the first flange further comprises a first connection pipe extending in the axial direction from one side of the body portion, provided with a coupling hole to which the one end of the refrigerant pipe is coupled, and a positioning jaw for determining a position of the refrigerant pipe coupled to the coupling hole; and a chip storage groove formed between the inner side of the first connection pipe and the outer side of the positioning jaw to collect chips generated during laser fusion between the refrigerant pipe and the first flange. a refrigerant pipe that is formed of a plastic material and has a multi-layered pipe structure including an outer layer and an inner layer, and provides a fluid flow between parts constituting the air conditioner system; at least one first flange formed of the plastic material and providing a connection between the refrigerant pipe and components constituting the air conditioner system; and at least one second flange formed of the plastic material; wherein the first flange comprises a hollow body portion; and wherein the first flange is joined by laser fusion in a state in which one end of the refrigerant pipe is coupled; characterized in that the at least one second flange is connected to a charging valve for injecting a refrigerant into the refrigerant pipe, wherein the second flange is joined by laser fusion in a state in which the lower portion of the second flange is seated in close contact with the upper portion of the outer circumferential surface of the refrigerant pipe, wherein the first flange further comprises a first connection pipe extending in the axial direction from one side of the body portion, provided with a coupling hole to which the one end of the refrigerant pipe is coupled, and a positioning jaw for determining a position of the refrigerant pipe coupled to the coupling hole; and wherein the second flange is joined by laser fusion in a state in which the lower portion of the second flange is seated in close contact with the upper portion of the outer circumferential surface of the refrigerant pipe, wherein the first flange further comprises a first connection pipe extending in the axial direction from one side of the body portion, provided with a coupling hole to which the one end of the refrigerant pipe is coupled, and a positioning jaw for determining a position of the refrigerant pipe coupled to the coupling hole; and a chip storage groove formed between the inner side of the first connection pipe and the outer side of the positioning jaw to collect chips generated during laser fusion between the refrigerant pipe and the first flange.