Showing posts with label gas. Show all posts
Showing posts with label gas. Show all posts

Tuesday, December 20, 2016

Power Generation Conversion From Coal To Gas - Impact on Valves

industrial gas turbine power generation
Gas Turbine
The combination of historically low gas prices and pressure from more stringent emission requirements for combustion operations has led to a wave of plant conversions from coal to gas as the fuel for power generating equipment. Conversions, as opposed to completely new facilities, pose a challenge regarding how much of the existing system can be used as part of the converted system. One aspect of that challenge is the valves on the existing system.

Crane ChemPharma & Energy, a globally recognized manufacturer of industrial valves for a wide range of applications, authored a white paper covering the subject of valve usage and replacement in power generation facilities converting from coal to gas. The paper provides a useful overview of the current state of power generating facilities with respect to regulation and the anticipated supply and cost of gas in the future.

The application and suitability of existing and new valves at various function points throughout the power generation system is outlined and explained. The paper does a good job of reducing the complicated issue into a few pages of direct understandable explanation.

The paper from Crane ChemPharma & Energy is included below. Share your industrial valve challenges with product application specialists, combining your own process expertise with their product knowledge to develop effective solutions.


Tuesday, December 6, 2016

Pressure Regulating Valves

industrial pressure regulator valve for steam brass
PIlot operated pressure regulator
intended for use in a steam system
Courtesy Pentair - Cash Valve
Many processes and equipment employ pressure regulating valves, the function of which is to maintain a desired outlet fluid pressure under varying conditions of supply pressure or outlet flow.

There are many pressure regulating valve variants, specifically designed to address a range of process conditions or offset a performance characteristic deemed undesirable in another design. Each variant has a suitable place in the range of possible applications, with cost, size, and complexity primary differences among the different offerings.

In its simplest form, a pressure regulating valve (PRV) consists of a flow restricting element, a measuring element, and a setpoint element. Outlet pressure applies force to the measuring element, often a diaphragm. As the outlet pressure increases, the diaphragm will move the flow restricting element toward the closed position, reducing the flow from the inlet. The restricting element is commonly a plug, disk, or some other recognizable valve trim arrangement. The setpoint element, likely a spring, provides a counterbalancing force on the diaphragm. When the force applied to the diaphragm by the outlet pressure reaches equilibrium with the counterbalancing force applied by the spring, movement of the restricting element stops. In this way, outlet pressure is controlled without the need for electric power, sensors, transmitters, or even a process controller. The entire assembly is self-contained and requires little attention.

Selecting a PRV for an application requires coordinated consideration of process performance range, desired conditions, and valve attributes to produce a selection that will provide the desired service. A valve improperly selected for an application may perform poorly. Some of the items to be considered include:
  • PRV Type
  • Body size
  • Construction
  • Pressure Ratings
  • Maximum Flow Rate
  • Outlet Pressure Range
  • Accuracy
  • Inlet Pressure
  • Orifice Diameter
  • Response Speed
  • Turn-Down Ratio
A PRV is not a safety device, so independent means must be provided to protect the system from excessive pressure. Product specialists are a good source of help in selecting a properly sized and configured valve for an application. Share your fluid process control challenges with a product application specialist, combining your process knowledge with their product application expertise to develop effective solutions.


Monday, April 4, 2016

Who Is OMB Valve?


large 42" industrial trunnion mount ball valve for oil industry
42" Trunnion Ball Valve
Courtesy OMB Valves
Mountain States Engineering offers the OMB line of valves for the transportation and energy industries throughout the western states. OMB has been a manufacturer of forged steel valves since 1973, starting business in Italy and establishing a presence in every major energy producing region of the world. North American operations are supported from the Stafford, Texas plant which has expanded to over 100,000 square feet.

OMB manufactures globe, ball, gate, and check valves with a broad range of variants to meet diverse requirements throughout the world. The company is well known for is line of forged steel valves, but OMB also fabricates using other materials, including specialty alloys.

Review the company's full product line below. Contact the valve application specialists at Mountain States Engineering for additional product information or assistance meeting any industrial or process control valve challenge.