Inspection and maintenance of propylene spherical tanks
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There are 5 propylene spherical tanks. Due to construction quality issues, components need to be replaced in two of these tanks, which involves risky tasks such as cutting, welding, and flaw detection. However, the other three tanks must continue to be in use as production cannot be halted. How can such a serious problem be resolved? ? Perhaps no maintenance is needed; the three ball tanks are not sufficient to meet the process requirements, which may prevent an increase in load. The amount of raw material that can be introduced at each time is limited. If maintenance is carried out, three tanks will be in use while two will require welding work, which is quite troublesome. Are there any standards or regulations that govern such maintenance activities? ?
:When performing maintenance on the handshake unit, please first check whether the vapor equilibrium pipes of these five tanks are connected. If they are connected, I recommend evacuating all of them to avoid danger! If they can be isolated from each other, evacuate the tank that needs maintenance, then purge the interior of the container with hot nitrogen and send it to the flare system for combustion; after verifying that the levels of flammable gases are within acceptable limits, open the tank and use fans to introduce fresh air for the repair work
It is recommended to carry out the treatment over an extended period of time, to test for combustible gases, water accumulation, and steam. Moreover, when working with fire, it is essential to isolate the maintenance tank from the production tank, including the buried wires and grounding wires. Overall, it is still quite dangerous
First of all, a situation like yours definitely falls under working in an area prone to fire and explosion, and standards prohibit such activities； Secondly, the situations involving open flames at the site are often diverse and cannot be confined to the limits of theory ； Furthermore, in a situation like the one you described, it is not impossible to carry out welding work; aside from complying with the usual procedures required for such work, special measures must also be taken: 1. Thorough inspections are necessary, focusing on whether the welding equipment is properly isolated, including proper grounding, and to ensure that there are no hidden areas – it is essential that the tank being worked on remains an isolated unit ； 1. Check the explosion-proof properties of the construction equipment. 2. Effective isolation measures must be taken. 3. Fire trucks should be sent to the site to spray water on the other three tanks. 4. It is preferable not to use manual arc welding for welding; methods such as TIG welding, which produces less spatter, should be used. Similarly, oxygen-acetylene cutting should also be avoided. 5. Finally, the welding machine must be insulated from the ground. After all this discussion, dangers still remain inevitable ； Firework use here must be approved by the senior manager; otherwise, it is absolutely forbidden!
We also need to carry out similar tasks in the near future, including the replacement of process pipelines in the tank area and tank inspections, etc. Maintenance equipment must be completely isolated from that in use; maintenance work can only proceed after the equipment has been cleaned and purged to meet the required standards. The main thing is that the cleaning and replacement process must be thorough and detailed; carelessness is not allowed. It was explained clearly upstairs: it is necessary to ensure that the construction tank is a standalone unit, and this point must be taken into account. All the relevant procedures must not be omitted.