Soft Goods for Power Plants

2 sizes of metal expansion joints.

L. A. King Co. supplies new and replacement “soft goods” used in power plants:

  • Expansion joints
  • Expansion joint “belts"
  • Insulating pillows
  • Acoustic seals and pillows
  • Custom gaskets
  • Thermal and acoustic materials

Our core experience is GE gas turbine power plants.

Contact L. A. King Co.

Outlet Duct Expansion Joints

High temperatures inherent in outlet ducts and/or flu gas ducts require the use of materials that have a higher melting point. High melting point materials that are also flexible tend to be permeable, i.e. they don’t provide the important vapor or chemical seal. So, we use rubber (fluoropolymer) blends (generally a PTFE) for the vapor barrier, and then protect it from the heat with materials that are insulating and have a high melting point. At lower temperature (200F to 600F) this could be woven fiberglass laminated to fiberglass reinforced PTFE. At higher gas temperatures, additional insulating materials are utilized to protect the PTFE (positioned on the outside of the belt) such as fiberglass fibercloth and layers of insulation (ceramic or silica fiber). These “hot belts” or “EJs” are sometimes referred to as built-up belts or layered belts. Common outlet duct expansion joints used in GE plants include the GE B1100 and B1300. Braden Manufacturing had their own B1100 and B1300 belt designs. We also have our own proprietary designs.

Expansion joints are used where flu duct connects to downstream systems such as condensers, boilers, scrubbers, stacks, silencers, and Heat Recover Steam Generator (HRSG). Our products include:

  • Flu Duct Expansion Joints
  • Heat Recover Steam Generator (HRSG) Expansion Joints
  • Silencer Inlet and Outlet Expansion Joints

Of course, flexible joints are needed along steel ducting to absorb vibration and thermal expansion and contraction.

Inlet Duct Expansion Joints

Cool temperatures enable the use of durable rubber materials that are flexible, easily molded and impermeable. Impermeability is important so gasses in the system remain in the system, and gases and impurities outside the system do not enter the system. Commonly used materials are silicone, neoprene (such as Garlock), FKM (such as Viton) and PTFE. All typically reinforced with woven fiberglass strands which provide strength, durability and tear-resistance.

Acoustic Seals and Acoustic Panels

Power plants are noisy. Gas turbine power plants contain jet engines! Noise pollution laws require noise mitigation. Many of the materials mentioned above happen to have excellent acoustic absorption. Other materials that have superior acoustic suppression, such as vinyl septum (aka barrier mat aka mass loaded vinyl), are also utilized in the products we make and materials we furnish for use in power plants

Custom Gaskets

Power plants have a lot of equipment, and a lot of heat and vibration. Each piece of equipment is typically placed or set on gaskets made of closed cell neoprene. Each, custom made. We’ve been making them for years. Customers typically order them with adhesive paper on one side (which sticks to the floor).

Custom Insulating and Sound-Deadening Materials

Insulating and sound deadening materials laying on a tarp.

Exhaust temperatures in power plants can be well over 2,000F. The flexible outer gas seal membrane of the expansion joint belt may need to be protected by more than the insulating layers built into the belt. As such, layers of insulation and insulating pillows(dome seal pillows, inner and outer cavity pillows) are designed into the expansion joint. L. A. King Co. makes these custom pillows, of various designs and materials, that are inserted into the expansion joint frame like puzzle pieces and held in place with weld pins and clips.

When you need solutions instead of problems, call
L. A. King.

Contact L. A. King Co.