Today, there was a blind plate pumping operation at the scene, and it was found that the operator's confirmation before the operation was not in place, so Xiaobian told the operator two cases I experienced:
Case 1: When a new plant is started, the process of switching the product after the device is qualified, the oil-removing line needs to be blinded, and the operator splashes the material when the “8†word blind plate is pulled out. One of the operators has splashed oil in the eyes. There is no serious problem after flushing in time. The reason is that the pressure in the pipeline is not exhausted, and the logistics also has residual materials.
Case 2: When a hydrogenation unit completes the catalyst vulcanization, it is necessary to adjust the blind plate to the start-up process. When the blind plate is taken out, the operator feels that the body is unwell, and the hydrogen sulfide alarm device that is carried with him alarms and immediately retreats to the upper wind. The reason is that the pipeline has not been replaced, and the hydrogen sulfide exceeds the standard.
Although the two cases did not cause an accident, they all caused certain damage to the operator. Therefore, it is necessary to take safety measures to prevent personal injury before the blind plate is blocked. Summary Based on your work experience, summarize some experiences and share them with everyone!
In this issue, we need to take safety measures carefully before pumping blind blocks.
Confirm that there is no pressure before and after the blind plate, and the medium is empty.
The valve on the blind plate and downstream should be closed. The on-site need to open the guide to confirm no pressure. Note that the actual spray may not be possible during the actual operation. It is necessary to test whether the drip is unblocked in the pipeline. Otherwise, it is impossible to determine the pressure of the pipeline. .
2
If the toxic medium is contained, it needs to be replaced.
If the pipeline contains harmful gas, it needs to be replaced by nitrogen. Conditional analysis is required. It is true that there is no analytical means to confirm that the replacement process is in place, and the personnel wear a gas mask during operation.
3
The temperature of the pipeline should be lowered.
The temperature of the pipeline should be lowered , preferably below 40 °C, and the steam line should be protected from burns.
4
The operator is protected.
Personal protection of personnel should be done well, and gloves, goggles and anti-virus masks should be worn.
5
Pay attention to the operation skills.
The other is the operation skill. After the bolt is loosened, pay attention to observe whether there is oil and gas leakage. If there is leakage, stop the operation immediately and continue to relieve pressure. When the blind plate is used, the operator should stand on one side as much as possible, and the body and face should not be facing each other. Flange to avoid being splashed.
6
Do a good JHA analysis.
Others are the technical requirements of the blind plate, such as thickness, gasket, etc., will not be introduced here. The other is to do a pre-work safety analysis (JHA), which is very important:
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