Operation

FIGURE 3.

TYPICAL WATER COOLED OIL COOLER

DIAGRAM

The solenoid valve provides positive water shut- off when the compressor is not in operation. A temperature of 150°F is considered high in most circumstances and the compressor is protected by a safety control to prevent operation of the com- pressor above this temperature. Unless otherwise specified, the oil cooler is sized for an 85°F water inlet temperature and 10°F temperature rise.

2. Liquid Injection Oil Cooling.

The components are furnished with liquid injec- tion for a typical system. The liquid solenoid valve opens whenever the compressor is in operation. The thermostatic expansion valve controls the flow of liquid refrigerant to the compressor injec- tion port in response to the discharge tempera- ture. The discharge temperature is maintained at a minimum of 120°F with a maximum of 140°F. The discharge temperature can be adjusted either of two ways. First, the small outlet pressure regula- tor can be used to adjust superheat. Normally, this regulator should be adjusted to maintain 70 psig pressure at the external equalizing port of the ex- pansion valve. Raising the pressure beyond 70 psig tends to raise the discharge temperature, while lowering the pressure lowers the discharge tem- perature. Secondly, the standard superheat adjust- ing screw on the thermostatic expansion valve can be used to adjust the discharge temperature.

FIGURE 4.

TYPICAL LIQUID INJECTION OIL COOLING

SCHEMATIC DIAGRAM

Liquid injection cooling on booster compressors is handled in the following manner. Using high pressure liquid, the point of injection can be the discharge line and no horsepower penalty is paid by injecting liquid into the compressor discharge line. The high pressure gas source normally used for the pressure regulator would be compressor discharge pressure. Since, on a booster unit, this intermediate pressure is very rarely as high as the nominal setting of 70 psig, high stage discharge gas is used. On high stage compressors, the liquid is injected directly into the compressor. However, there is a horsepower penalty when the liquid is injected into the compressor. This will vary with refrigerant and operating condition. The liquid

is injected into the compressor at a point in the compressor cycle that minimizes the brake horse- power penalty.

3. V-PLUS Oil Cooling System

This system consists of a liquid pump, shut-off valves, motor, solid state variable speed controller and solid state temperature controller. This meth- od of oil cooling is not available on the VSM or VSR compressor units. The pump and solenoid valve cycle on and off in parallel with the compressor drive motor. The temperature controller receives a temperature signal from the sensor located in the discharge and oil lines and in turn, sends a signal to the motor speed controller.

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Emerson VSS, VSR, VSM Typical Water Cooled OIL Cooler Diagram, Typical Liquid Injection OIL Cooling Schematic Diagram
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VSS, VSM, VSR specifications

Emerson VSM, VSR, and VSS are advanced technologies designed for process automation and control, often utilized in industrial applications. These systems are part of Emerson's broader portfolio of solutions aimed at enhancing operational efficiency, safety, and reliability.

The Emerson VSM, or Valve Signature Management, focuses on the digital management of valves within a system. One of its main features includes advanced diagnostics that monitor the health and performance of control valves. This technology allows for predictive maintenance, ensuring that valves operate at peak efficiency and reducing the risk of unexpected failures. The VSM utilizes a combination of smart sensors and actuators to gather data, enabling real-time analytics that can enhance decision-making and operational strategies.

On the other hand, VSR, or Valve Status Reporting, enhances visibility into the operational state of valves in real time. This system provides operators with critical updates and alerts related to valve conditions, significantly reducing response times to potential issues. The VSR technology integrates seamlessly with existing control systems, allowing for easier implementation and minimal disruption to ongoing operations. The reporting capabilities feature user-friendly dashboards that present complex data in a straightforward manner, empowering operators to make informed decisions quickly.

The Emerson VSS, or Valve Service Solutions, complements the VSM and VSR by focusing on the maintenance and support of valve systems. This offering includes comprehensive service packages that range from routine maintenance to advanced troubleshooting and repair. The VSS is designed to improve the lifespan of valves through proactive service, ensuring reliability and minimal downtime. Emerson’s trained technicians leverage predictive analytics derived from VSM and VSR data, allowing for timely intervention before issues escalate.

In summary, Emerson’s VSM, VSR, and VSS technologies work together to create a robust ecosystem for valve management in industrial settings. The combination of advanced diagnostics, real-time reporting, and comprehensive service solutions provides operators with a powerful toolkit aimed at optimizing performance and ensuring operational reliability. With these technologies, companies can embrace digital transformation, reduce operational risks, and improve overall process efficiency, leading to a safer and more productive environment. Each component plays a crucial role in empowering industries to meet the challenges of modern automation and maintain competitive advantages in their respective markets.
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