开泵试抽 安装射流泵，连接抽真空设备，试抽气，抽气开始时，要把所有的抽

A pump suction again <br>mounted jet pumps, vacuum devices are connected, again evacuated during evacuation starts, put all the suction pump are actuated, and carefully observe the changes in the degree of vacuum, under normal circumstances, a pump 2 ~ 4 h , The vacuum at the pump port can reach 20 kPa. At this stage, some people should be arranged to inspect the plot and the membrane trenches carefully. Looking for leaks, find a group of pumps to stop and repair a batch, and repeatedly search and repair Until there is no air leak. During the inspection, pay special attention to whether there is air leakage in the pressure film groove. If there is air leakage, the pump must be stopped and repaired in time. When the vacuum in the membrane reaches 40 kPa, the pump should be stopped for a comprehensive inspection, which includes: <br>(1) Whether the ground <br>inside and outside the membrane has collapsed, and find out the reasons for reinforcement; (2) There are No excessive uneven settlement, such as when the settlement is collapsed, cut the sealing film and fill it with sand; <br>(3) Whether the sensitivity of the vacuum gauge is normal; <br>(4) Whether the electrical appliances and machinery are intact.

Open pump test pumping <br>Installation of jet pump, connection vacuum equipment, test pumping, pumping start, to all pumping pump, and carefully observe the change of vacuum, under normal circumstances, after opening the pump 2 to 4 h, the vacuum at the pump port can reach 20 kPa, this stage to arrange some people in the plot and near the membrane ditch serious inspection. Inspection should pay special attention to the pressure film ditch whether there is air leakage, such as air leakage must stop pump repair in time. When the in-film vacuum level reaches 40 kPa, the pump should be stopped for a comprehensive overhaul, including:<br>(1) Whether the ground inside and outside the membrane has collapsed, and the cause is determined for reinforcement treatment;<br>(2) Whether there is excessive uneven settlement in the pre-pressure area, such as sedimentation collapse, to cut open the sealing film with sand to fill;<br>(3) Whether the sensitivity of the vacuum meter is normal;<br>(4) Electrical appliances, machinery is intact.

Pumping test<br>Install the jet pump, connect the vacuumizing equipment, test the vacuumizing. At the beginning of the vacuumizing, start all the vacuumizing pumps, and carefully observe the change of the vacuum degree. Under normal circumstances, the vacuum degree at the pump port can reach 20 2-4 hours after the pump is started KPa, in this stage, more people should be arranged to carefully patrol around the plot and the membrane ditch to find the leaking parts, and one batch of pumps should be stopped for repair, and one batch of them should be repeatedly searched and repaired until there is no leaking point. During patrol inspection, pay special attention to whether there is air leakage in the pressure film groove. If there is air leakage, stop the pump in time for repair. When the vacuum degree in the membrane reaches 40 kPa, the pump shall be stopped for a comprehensive overhaul, which includes:<br>(1) Whether the ground inside and outside the membrane collapses, and find out the reasons for reinforcement;<br>(2) Whether there is excessive uneven settlement in the preloading area. If the settlement is collapsed, the sealing film shall be cut and filled with sand;<br>(3) Whether the sensitivity of vacuum gauge is normal;<br>(4) Whether electrical appliances and machinery are in good condition.<br>