Specification requirements for isolation valves on Class A and Class B storage tanks
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The company has Propylene Oxide stored in Class A1 tanks. The design was carried out by the design institute before 2014; I’ve heard that after 2014, dual shut-off valves are required for the sequential shutdown of Class A1 tanks. I would like to know which specific standard this refers to Could an older brother provide it?
A SIS system should be installed; for the dual valves, one is considered to be a cut-off valve operated via DCS, while the other is a SIS valve.
Well, that’s what it means: one isolation valve is connected to the SIS, and another isolation valve is used for DCS control. Right now it’s not clear which valves require a dual-valve design, nor which specific standard mandates this requirement; it’s just that there is a clear demand for two isolation valves. . . .
Check if you need to log in to the SIS system. This is because the specifications for SIS and DCS systems are independent of each other.
I’m currently using SIS, and I’m not quite sure which standard specifies the use of these two shut-off valves. . I searched for a long time but couldn’t find it
The quick-cut valves can generally be directly connected to the SIS system, and hard manual operation can then be configured. Isn’t it a waste to use 2 cut-off valves, with one connected to the SIS and the other to the DCS? How many more sealing points are needed? As far as I know, there are no requirements for installing double isolation valves; only major hazard sources of level 1 and level 2 require a separate SIS system
For major hazard sources of level 1 and 2, an SIS is required; it should be a cut-off valve in the DCS and another cut-off valve in the SIS, right?
I’ve never heard that dual isolation valves are necessary
I’ve never heard that dual isolation valves are necessary
Are there any specific regulations? I’ve been looking for them for ages but can’t find them. . .