Plan72+75 is a standard auxiliary control system for dry gas seals. The instrument configuration is not fixed and can be customized according to site process conditions, DCS automatic control schemes, safety standards and project budgets. According to customer requirements, this unit is equipped with five monitoring instruments: one level transmitter, one flow transmitter, two pressure transmitters and one local pressure gauge. These instruments jointly monitor seal operating status, buffer gas conditions and medium leakage to ensure safe, stable and long-term operation of dry gas seals.
 
The level transmitter monitors the condensate liquid level of the collection tank in real time. During equipment operation, trace process medium leaked from the dry gas seal condenses and accumulates inside the tank. The level transmitter continuously transmits liquid level data remotely. When reaching the high-level set value, the system triggers an alarm for draining, effectively preventing condensate backflow, avoiding damage to the seal face and gas film structure, and fully protecting the dry gas seal.
 
The flow transmitter detects the buffer nitrogen flow of the Plan72 loop. Stable buffer gas supply is essential for maintaining the seal gas film and blocking medium leakage. Low flow indicates insufficient air supply or pipeline blockage, while sudden flow increase usually means primary seal leakage. Flow variation data accurately reflects seal operating conditions and supports daily maintenance and troubleshooting.
 
Two pressure transmitters realize remote system pressure monitoring. One transmitter monitors the inlet buffer gas pressure to keep it within the standard range. Deviated pressure will affect gas film formation and stability, and the transmitter provides timely abnormal pressure alarm to maintain stable and compliant gas supply. The other transmitter monitors the pressure of the leakage cavity and collection tank. Pressure changes reflect seal leakage volume and predict seal wear or failure in advance.
 
The local pressure gauge is applied for on-site inspection, commissioning and data verification. It displays real-time on-site pressure values visually, allowing operators to check working conditions on site and compare data with remote DCS readings. It supports equipment calibration and daily inspection, quickly identifies instrument deviation and faults, and improves the overall stability and maintainability of the system.
 
The instrument configuration is fully customizable. Customers can adjust instrument quantity, measuring ranges and explosion-proof types (intrinsically safe or flameproof). The system can adopt basic simplified configuration or be expanded with temperature transmitters, flow switches, liquid level switches and other components. All selections strictly comply with API 682 standards.
 
This customized multi-dimensional instrument monitoring system realizes integrated monitoring of liquid level, flow and pressure. It effectively reduces dry gas seal failure risks, extends equipment service life, and fully adapts to harsh working conditions in chemical and petrochemical industries.

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