Safety valve management
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When installing pressure safety valves in chemical plants, can a gate valve be installed at the bottom to facilitate future regular inspections? Is installing a gate valve in compliance with safety regulations? Could an experienced colleague give some advice?
It can be installed. The design specifications do not explicitly prohibit the installation of root valves; currently, various companies install such valves in accordance with the requirement for maintenance every three years. However, two sets of these valves are necessary as a backup for each other, so that when one set is used to maintain a constant pressure, the other set can function as a backup.
A root valve can be installed, but it must remain open at all times. Additionally, a bypass valve for the safety valve should be installed as well, so that it can be activated in case the safety valve fails to open. However, the bypass valve is usually closed, with a sign indicating this.
It can be installed, but the diameter must be larger than that of the safety valve inlet, and it must have a device to prevent accidental locking. The bypass mentioned upstairs needs to be studied; it should be set up.
A gate valve can be installed at the base of the safety valve; it must be fully opened and sealed with lead seals. Otherwise, how can a major overhaul every three years be carried out?