VACUUM HEAT INSULATING PIPE UNIT FOR LIQUEFIED GAS, AND DAMAGE DETECTION METHOD FOR VACUUM HEAT INSULATING PIPE FOR LIQUEFIED GAS

To detect damage of a pipe appropriately and reliably with a simple structure, regarding a vacuum heat insulating pipe for liquefied gas.SOLUTION: A pipe unit (1) for transferring liquefied gas has an inner pipe (7) through which the liquefied gas passes, and an outer pipe (9) that covers the inner pipe. A vacuum heat insulating pipe (5) in which a vacuum layer (11) is formed between the inner pipe (7) and the outer pipe, is provided with an inner pipe pressure measurement device (13) that measures a pressure in the inner pipe (7), an outer pipe pressure relief device (15) provided in the outer pipe (9), and a gas detection device (17) that detects the type of gas released from the outer tube pressure relief device (15).SELECTED DRAWING: Figure 2 【課題】液化ガス用真空断熱管について、簡易な構造で適時にかつ確実に配管の破損を検知する。【解決手段】液化ガスを移送するための配管ユニット（１）において、前記液化ガスを通過させる内管（７）および当該内管を覆う外管（９）を有し、前記内管（７）と前記外管との間に真空層（１１）が形成された真空断熱配管（５）に、前記内管（７）内の圧力を計測する内管圧力計測装置（１３）と、前記外管（９）に設けられた外管圧力逃し装置（１５）と、前記外管圧力逃し装置（１５）から放出されたガスの種類を検知するガス検知機器（１７）とを設ける。【選択図】図２