DOUBLE PIPE FOR LIQUEFACTION GAS TRANSFER

To support thrust generated in an inner pipe without causing radial displacement due to heat shrinkage in a bent pipe part of the inner pipe with a simple structure in a double pipe for liquefaction gas transfer including the bent pipe part.SOLUTION: A double pipe (1) for liquefaction gas transfer includes an inner pipe (3) for making a liquefaction gas pass through, and an outer pipe (5) for forming a vacuum insulation layer (7) between the inner pipe and itself. The inner pipe (3) is a double pipe including a first a straight pipe part (9) extending in a first direction (X1) and supported in a displaceable manner in the first direction, a second straight pipe part (11) extending in a second direction (X2) different from the first direction (X1) and supported in a displaceable manner in the second direction, and a bent pipe part (13) for connecting the first straight pipe part and the second straight pipe part, and includes a first inner pipe axis direction support member (21) and a second inner pipe axis direction support member (23) formed from a heat insulation material and respectively provided on an axial center (C1) of the first straight pipe part (9) and an axial center (C2) of the second straight pipe part (11) between the bent pipe part (13) and the outer pipe (5).SELECTED DRAWING: Figure 1 【課題】曲管部を含む液化ガス移送用二重配管において、簡易な構造で、内管の曲管部に熱収縮による径方向変位を生じさせることなく、内管に発生する推力を支持する。【解決手段】液化ガス移送用二重配管（１）は、液化ガスを通過させる内管（３）と、内管との間に真空断熱層（７）を形成する外管（５）とを備え、内管（３）は、第１の方向（Ｘ１）に延び、第１の方向に変位可能に支持された第１直管部（９）と、第１の方向（Ｘ１）と異なる第２の方向（Ｘ２）に延び、第２の方向に変位可能に支持された第２直管部（１１）と、第１直管部と第２直管部とを接続する曲管部（１３）とを有する、二重配管であって、曲管部（１３）と外管（５）との間において第１直管部（９）の軸心（Ｃ１）および第２直管部（１１）の軸心（Ｃ２）上にそれぞれ設けられた、断熱材から形成された第１内管軸心方向支持部材（２１）および第２内管軸心方向支持部材（２３）とを備える。【選択図】図１