Fabric expansion joints are often used in ducts which carry hot gases at very low pressures. Layers of different fabrics and insulation can be combined to accommodate the temperatures and pressure in the system.
Round Fabric Expansion Joints
Fabric expansion joint applications include, air and flue gas duct systems, flue gas desulfurization systems, gas turbines and diesel engine exhaust, incinerators, etc.
Rectangular Fabric Expansion Joints
Materials for fabric expansion joints include: silica cloth, mineral wool insulation pillows, PTFE coated fiberglass, ceramic fiberglass and aluminum coated fiberglass.
Furnace Sealing Bag
A special type of high temperature fabric expansion joint developed by U.S. Bellows, Inc. is a furnace sealing bag. The objective of the bag is to seal the air inlet conduits penetrations into a furnace and thus prevent heat loss.
View the Technical Bulletin on Furance Bags
128" x 229" Rectangular Fabric Expansion Joints
Rectangular Fabric Expansion Joints
The fabric expansion joints shown above are fabricated with a three layer fabric belt. The three layers consist of an inner layer of silica cloth, a middle layer of mineral wool and an outer layer of PTFE/coated fiber glass. The frame includes an insulation blanket of mineral wool and stainless steel wire mesh. The frame and liner are fabricated from 3/8″ thick 304 stainless steel and each expansion joint’s frame and liner welds were dye-penetrant tested before shipping.
- Pressure: 1 PSIG
- Temperature: 1010°F
- 2″ Axial Displacement
- 3/4″ Lateral Displacement
Two Fabric Expansion Joints for an Oil Refinery in Saudi Arabia
These are 24″ diameter fabric expansion joints with an overall face to face dimension of 12″. Each expansion joint weighs 300 lb. Installed in the inlet and exhaust piping of a hot air blower, they can withstand temperatures of up to 850F. These expansion joints were fabricated in three layers that consisted of aluminized fiberglass, ceramic fiber, and silica treated fabrics. The flanges were fabricated from carbon steel with special hex nuts welded to the inside of the bolt holes. The stud bolts are in place to assure correct alignment of the bolts to the flange bolt holes. Visual inspection and trial fitting of the stud bolts were performed to assure quality and performance.
3 Fabric Expansion Joints for a Power Company in Texas
These fabric expansion joints are made of stainless steel liner, flanged ends, backing bars, and PTFE impregnated fiberglass. They weigh between 370 lbs – 380 lbs and measure 81.15″ long, 18.44″ wide, and 16″ high. They are used in high temperature air ducts to allow for expansion. Its thermal growth consists of +/- 1/8 X-Y-Z directions. It is capable of withstanding 400°F at +/- 0.8 PSIG at a maximum flow of 130,650 ACFM. Standard testing was performed for quality assurance.
17 Fabric Expansion Joints for a Gas Turbine Power Plant
Close Up View of Fabric
These rectangular fabric expansion joints measure 136″ x 54″ with a weight of 135 lbs each. They were fabricated out of fiberglass fabric with stainless steel frames and are designed for ± 5 PSIG and 400°F. The expansion joints were manufactured according to specific customer specifications.
42” I.D Rubber Expansion Joints for a Power Plant in Texas
The expansion joints consist of bellows formed by 1/8” thick neoprene sheet and A36 carbon steel flanges coated with a special finish per customer’s request. These expansion joints are 42” x 7 ¾”. A dye-penetrant test was performed on the welds prior to shipping to ensure quality. The turn around for this product was four days.
Fabric Expansion Joints for a Power System Company in Texas
U.S. Bellows, Inc. recently custom designed and fabricated 17 rectangular fabric expansion joints for a power system company in Texas. The expansion joints measure 54” x 136” and weigh 135 lb. each. They are designed for operation up to 5 PSIG and temperatures up to 400 degrees. The expansion joints are made of fiberglass fabric and have stainless steel frames.
Fabric Expansion Joints for Power System Company in Texas
U.S. Bellows, Inc. recently custom designed and fabricated five fabric expansion joints for a power system company in Texas. The expansion joints range in size from 30 to 62 in diameter and the rectangular expansion joints measure 81 x 18 and 136 x 54. They are designed to operate from 0.8 to 5 PSIG and in temperatures ranging from -40˚F to 400˚F. The products were fabricated using Neoprene and fiberglass fabric with carbon and stainless steel frames. A special paint system was applied per customer’s request. Additionally, the products were manufactured according to customer’s specific quality specifications.
42" I.D. Rubber Expansion Joints for Power Plant in Texas
U.S. Bellows, Inc. designed and fabricated a 42″ I.D. rubber expansion joint for a power plant in Texas. The expansion joint consists of a bellow formed by 1/8″ thick neoprene sheet and A36 carbon steel flanges coated with a special finish per customer’s request. To ensure quality, dye-pentrant testing was performed on the welds prior to shipping.
87 Fabric Expansion Joints for a Furnace Application at a Chemical Plant in Texas
U.S. Bellows, Inc. manufactured 87, rectangular fabric expansion joints for a furnace application at a chemical plant in Texas. The joints were designed at 11″ W.C. and 750 degrees F for ½” axial and lateral movements. The fabric belts on these joints are composed of three layers. They were equipped with a telescoping liner and 2″ thick insulation pillows to reduce the heat transfer.