Choosing the Right Valve for Pipeline Application

What valve would you choose for a pipeline application with high pressure, temperature, and requiring pigging?

Select one: A. Disc valve B. Rotary Plug valve C. Resilient seated Butterfly valve D. Globe valve

Answer:

For a pipeline application with high pressure and temperature that requires pigging, the most suitable valve choice is B. Rotary Plug valve.

The selection of an appropriate valve for a pipeline application that requires pigging involves considering factors such as fluid characteristics, pressure conditions, and the necessity for a full-bore valve to allow the pig to pass through.

With an upstream pressure of 1200kPa, downstream pressure of 710kPa, and a fluid temperature of 120℃, it is crucial to choose a valve that can withstand these conditions and provide an unobstructed path for pigging operations.

The options can be analyzed as follows:

• Disc Valve: Not commonly considered full-bore and may not be ideal for pigging.
• Rotary Plug Valve: Provides a full-bore design for pig passage, can handle high-pressure differentials and temperatures, making it the best choice for this scenario.
• Resilient Seated Butterfly Valve: Could potentially allow for pigging but may not provide the most reliable seal under high-temperature conditions.
• Globe Valve: Flow restrictions make them unsuitable for pigging operations.

Therefore, the Rotary Plug valve is the most suitable choice due to its ability to handle high-pressure and temperature conditions, providing a full-bore design for pigging operations.