What is the standard basis for the dual-valve arrangement in series with the tank plug?
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The design drawings for our new project have been finalized recently. For the root valves of the atmospheric vertical dome tanks (used for media such as butanol and octanol), they are designed to consist of two gate valves connected in series (see figure below). We feel that this approach is rather wasteful, as it increases costs significantly; moreover, there is also a ball valve on the pipeline right after the root valve in the design. I would like to ask whether this design is a standard requirement? What are the standards? Is it okay to use just a single gate valve as the root valve? With a large number of storage tanks, this can save at least millions.
What is the pipe diameter? Why is a gate valve with poor sealing performance used for the bottom valve of the tank, while a ball valve is used downstream?
The last edit to this post was made by 678-2 on 2017-10-11 at 13:08. Section 2.0.3.1 of \"HGT 20570.18-1995 Valve Installation\" specifies this. But according to the diagram you provided, one of the valves connected in series at the base of the tank can be removed. The valve on the combined main pipe is a series-connected dual valve. For your reference
Thank you, I think the same way: lol
Why aren’t ball valves, which offer better sealing performance and faster opening/closing speeds, used for root irrigation valves?
The dual valves reflect consideration for the ability to respond to emergencies； The dual-channel design facilitates the adjustment and selection of pressure differences. From a comprehensive perspective, the DBB ball valve within ball valves is more suitable for this application. Attached is a small image of the recent contact with a similar one:
Is it better to place this pneumatic cut-off valve on the inside or the outside?
The outer side, and the inner side functions as a closure in special cases.
It’s all for safety. Actually, you need my valves even more – the most advanced, durable, and fully functional valves available right now. They are friction-free (with an extremely long service life even with frequent use), truly DBB&DIB (allowing for immediate leak detection), featuring dual-directional forced sealing (blind-flange level sealing for complete zero leakage), and have fixed valve seats (more stable than spring seats). Feel free to add me on WeChat at 178 6590 9090 to discuss this further
According to the specifications for the installation of emergency shut-off valves, the first valve after the tank must be an emergency shut-off valve; therefore, the pneumatic type should be installed on the inside side.