What should be noted when conducting a pressure test for integrity before feeding crude oil into a vacuum distillation unit?

①For new equipment replaced during maintenance, water flushing must be carried out before performing the pressure test on the process pipelines. A filter screen must be installed at the pump inlet during water flushing, and the control valve’s flanges should be removed to prevent dirt from entering the pump and control valve ； ②During the through-pressure test, the control valve should be routed via the bypass line ； ③When passing through the furnace tubes, they should be passed through in sections one by one ； ④For equipment such as towers and containers that have specified pressure testing requirements, one must not leave the pressure gauge during testing, and must closely monitor the increase in pressure to prevent damage to the equipment due to overpressure ； ⑤During pressure testing, all condensate water in the steam must be removed to prevent water hammer; severe water hammer can damage equipment and pipelines.