| 摘要 |
<p>A flange (102) of a pipe (101) and a flange (104) of a pipe (103) are connected via the flanges. An annular seal groove (105) is formed in the flange surface (104a) of the flange (104). A sealing liquid is poured and placed in the seal groove (105) from a sealing liquid pouring section (110) via a pouring passage (106). The sealing liquid placed in the seal groove (105) forms a liquid seal structure to improve sealing ability. Further, the sealing liquid is placed also in a discharge passage (107) and a discharge pipe (121). When gas in the pipes (101,103) enters the seal groove (105), the gas can be discharged from a discharge device (120) and detected by a gas sensor (123) to enable the user to take safety measures.</p> |
