Solenoid valve SV-92 plays an important role in this compressor inlet separator control system. Level control valve LV-92 opens up when needed to drain liquid out of the “boot” of the separator vessel, which ideally contains only gas (vapor).
Examine this P&ID and then answer the following questions:
Questions :
- Identify the statuses of SV-92 and LV-92 when the separator boot liquid level is at or below the normal level of 1 foot 4 inches.
- Describe how this system responds to high liquid levels in the separator boot.
- What will be the consequence of an instrument air supply failure, as it relates to the separator boot liquid level?
- What will be the consequence of an AC power failure to LIC-92?
Answers :
- Identify the statuses of SV-92 and LV-92 when the separator boot liquid level is at or below the normal level of 1 foot 4 inches. LV-92 will be closed, and SV-92’s coil will be de-energized.
- Describe how this system responds to high liquid levels in the separator boot. If LT-92 senses a high liquid level, controller LIC-92 will respond by applying electrical power to SV-92. When SV-92 actuates, it sends instrument air to the diaphragm actuator of LV-92 to cause that drain valve to open. As LV-92 drains liquid out of the boot, the level sensed by LT-92 decreases over time, eventually to a point where controller LIC-92 stops sending power to the coil of SV-92.
- What will be the consequence of an instrument air supply failure, as it relates to the separator boot liquid level? Without instrument air supply (IAS), the level drain valve LV-92 can never open and the separator boot liquid level will rise unabated. Eventually LSHH-231 will detect the high-high level condition and command the Emergency Shut-Down (ESD) system to turn the compressor off in order to avoid damaging that machine.
- What will be the consequence of an AC power failure to LIC-92? Without AC power to energized the coil of solenoid SV-92, the level drain valve LV-92 will never be commanded to open by SV-92 and the separator boot liquid level will rise unabated. Eventually LSHH-231 will detect the high-high level condition and command the Emergency Shut-Down (ESD) system to turn the compressor off in order to avoid damaging that machine
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