Tank top safety valve and breathing valve issues

I personally think that the inspection period of the tank top safety valve can be slightly longer, 6-12 months is not appropriate! ! ! Breathing valves should be inspected at most monthly (preferably every 15 days)! ! General inspection should involve the use, maintenance and safety departments! ! For reference! ! !

Inspection of breathing valve and safety valve, this* * There are relevant regulations, you can check them. Our company's inspections are actually carried out by the maintenance department. Some safety valves have * * For compulsory inspection, it needs to be sent to * * Checked by a qualified department. Generally, it is limited to one quarter or one year.

The inspection and confirmation of our company's breathing valves and safety valves require authorization and supervision from the HSE department.

The inspection of the breathing valve can generally be done by the maintenance department. You can use compressed gas or nitrogen to test it yourself. However, the safety valve needs to be sent for inspection, and the quality supervision department will test it and issue a certificate.

The inspection cycle of the breathing valve is generally 3-6 months. In order to ensure the performance of the breathing valve for safe use all day long, users must perform regular inspection and maintenance of the breathing valve. Check whether the pressure valve disc and vacuum valve disc move flexibly, and whether the contact surfaces of the guide rod and valve sealing ring are damaged. When reinstalling the pressure valve disc and vacuum valve disc, ensure the tightness of the contact surface and the flexibility of the guide rod lifting. The user must remove the anti-vibration material from the valve disc when activating a new breathing valve.

The safety valve needs to be inspected every six months or once a year. The annual inspection needs to be completed by the pressure vessel inspection unit. The breathing valve is inspected by the user according to the plan.

study* Yes, is the breathing method to prevent the formation of negative pressure?

Let me also talk about the inspection of safety valves and mechanical breathing valves.* * There are regulations, please check specifically. Our unit is currently conducting self-inspections, and the number of inspections will be increased appropriately in winter. By the way, on the 8th floor, the breathing valve is also used to prevent the oil tank from holding pressure.

If you are in the north, frequent inspections are generally required in winter and foggy days. We have had situations where the breathing valve was trapped in the frozen tank during winter and the negative pressure generated in the tank deflated the tank. Vaulted roof tanks need to be inspected carefully, because oil and gas are very corrosive, and some tank roofs that have been built for a long time are severely corroded and may not be able to bear the weight of people. It is very dangerous to go up.

Safety valves need to be inspected every six months or once a year, and the annual inspection needs to be completed by a pressure vessel testing unit. The breathing valve installed on the storage tank is generally used for 1-3 months. It is necessary to regularly check whether the positive and negative pressure valve discs of the breathing valve work flexibly. When the breathing valve is working normally, it will make a "hiss-hiss-hiss" pressure relief and exhaust sound. Otherwise, it is necessary to open the valve cover on the top of the breathing valve and check whether the valve disc of the breathing valve has a "chuck" phenomenon. Check whether there is dirt on the guide rod. If there is any dirt, clean it in time to ensure that the guide rod operates freely. Check whether the sealing surface of the valve seat is worn. If it is worn, it must be replaced immediately to ensure the normal and safe operation of the breathing valve.