| 摘要 |
<p>PURPOSE:To perform airtightness test at a time and dispense with air purge before and after exchanging new and old pipes. CONSTITUTION:Gas pressure is applied on a secondary side piping 5 by utilizing a gas bomb 14, at exchanging new and old pipes gas pressure is applied on the secondary side piping 5 and gas is continued to flow little by little, simultaneously gas is continued to flow little by little from a primary side piping to the old pipe side, and changeover and joint of the new pipe 4 and the secondary side piping 5 is performed.</p> |
