The present invention relates to a piping jacket for freezing a piping or a valve of a plant or a plant facility, which is capable of shutting off a fluid by cooling a rear end with liquid nitrogen to generate a defect such as a pin hole or a crack, A first jacket 20a having a body 22 in close contact with the outer circumferential surface of the body 22 and a wing 26 in surface contact with both longitudinal sides of the body 22; A second jacket 20b which is positioned at an upper end of the first jacket 20a in the same shape as the first jacket 20a and in which an inlet 23 is formed in a part of the body 22; A surface-side hermetic member 30 positioned between the first jacket 20a and the wing portion 26 of the second jacket 20b;; 展开▼
