Is it not required to close the main valve for the tank root? Urgent! Urgent! Urgent!
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Is it not required to close the main valve for the tank root? There is a main valve as well as collector pipes; each pipeline is equipped with an operating valve. Is it possible to close only the operating valves without closing the main valve? Are there any specifications that explicitly require the main valve and the operating valve to be closed once use is complete?
It shouldn’t be necessary; turning it on and off too frequently isn’t a good thing.
It does not need to be turned off during normal operation, unless it is shut down for maintenance or long-term use
That’s how it was done before, and there is also a metal hose between the control valve and the main valve; if everything is closed off completely, it will surely have an impact on the metal hose as well. It would be best to have relevant regulatory provisions that clearly specify when to turn it on/off
The main valve at the base of the tank is usually not closed. .
I’m not sure if there are specific regulations regarding this, but I’ve received several notices asking me to make corrections because the valves weren’t closed. Normally open circuits do pose safety risks, but it’s also troublesome to have to turn them off every time. It mainly depends on the frequency of use.
Generally, the root valve located at the bottom of the tank is used as a shut-off valve, right? Under special operating conditions
If the main valve of a refined oil tank is not closed, there is a risk of oil leakage. Moreover, valves come in sealing grades A/B/C/D, with grade D being the lowest; we generally use grade D valves, but even so, there remains a risk of leakage and oil spillage. So whether to turn it on or off is likely to be controversial and confusing
Yes, but in the case of finished oil tanks, to ensure that there is no mixing of different oils, isn’t it necessary to require that they be closed?
Some of our plants require it to be closed, while others don’t; but if it’s installed on a finished oil tank, isn’t there a quality risk if it’s not closed? Urgent need for interpretations of relevant regulations (national standards/Sinopec/CNPC specifications)
It would be fine if there are **standard regulations, or clear rules set by companies in the petroleum and petrochemical industries**