System Title 

Automated system for process control (PCS) and emergency shutdown (ESD) for methane turbo unit M-2.

Purpose of the System Development

The system was developed to replace the out-of-date pneumatic automation devices with automated control systems based on electronic control tools and automation, including computing units.

Description of Automation

Methane turbo unit M-2 of the shop for pyrogases compression and separation is aimed for methane compression of LP ethylene unit, arriving from gas separating heat exchanger T-40 from 0.005 MPa (0.05 kgs/sm²) up to 0.65 MPa (6.5 kgs/sm²). Methane turbo unit M-2 is a process facility of the 2nd grade of explosive hazard. Rated capacity is 9800 nm³/hour. Condenser steam turbine serves as a drive unit.

Turbo unit consists of the following components:

• Condenser steam turbine including barring speed
• Two stage turbo compressor
• Steam and condensate systems
• Systems for lubricating and control oil
• Cooling system
• Instrument air system
• Systems for nitrogen supply to turbo units seals
• Valves
• Control valves

System Functions

• Displaying, registration and storage of process data
• Actuating devices control
• Automatic transfer switch for condensation pumps, oil pumps and power inputs
• Control of pressure, flow rate, level and frequency of rotation
• Surge protection and control
• Automated startup of turbo unit and warm-up
• Emergency shutdown system

Design

PCS and emergency shutdown system are based on DeltaV by Emerson Process Management AG.