Freezing apparatus for liquid-filled pipelines

Apparatus for freezing a liquid-filled pipeline using a vaporizable refrigerant conducted in a circuit, said apparatus comprising:

• a contact body having a partially cylindrical contact surface (2) adapted to engage with the pipeline (3, 5) and having expansion chambers (6, 7) connected fluidically in series for the evaporation of the refrigerant, a hose (13) for carrying away the evaporated refrigerant being connected to the contact body (1), a capillary line (14) supplying the liquid refrigerant extending through the hose (13) and into the contact body:
• (a) the hose (13), with the capillary line (14) passing through it, being connected with a connecting portion (24) of the contact body (1) in a direction normal to a surface line of the contact surface (2);
• and
• (b) the contact body (1) having a projection (16) adjacent the contact surface (2), said projection supporting a clamping spindle (17) adapted to attach the contact body (1) to the pipeline (3, 5), the spindle carrying a temperature sensor (20, 20a), which is brought by the clamping process into thermal contact with the pipeline (3, 5) on the side of the contact body (1) distal to the connecting portion (24).