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Externally Pressurized X-Flex Expansion Joints for a Overseas Facility

September 14, 2021

Externally Pressurized X-Flex Expansion Joints for a Overseas Facility

“Decarbonation” and “Carbon Neutral” are two key terms used to describe efforts to lower the amount of greenhouse gasses emitted into the atmosphere. Efforts are now underway to gradually convert existing Coal-Fired, HRSG (Heat Recovery Steam Generated or Natural Gas Powered) and other power plants utilizing fossil fuels onto plants that emit far fewer greenhouse gasses into the atmosphere. U.S. Bellows, Inc. received unique specifications to design and manufacture externally pressurized expansion joints for a facility overseas. The bellows are fabricated from 316 stainless steel and all other components are carbon steel. They are designed for a temperature of 200°F at 150 psig with 8″ axial compression. The units are 4″ NOP x 63″ L, 6″ NPS x 61.44″ L, and 12″ NPS x 64″ L.

3d drawing externally pressurized ej 171063Externally pressurized pipe expansion joints, also known as X-Flex expansion joints, are suited for piping systems that require large amounts of axial compression or extension. In externally pressurized pipe expansion joints, the bellows elements are arranged so that the media flow is on the external surface of the bellows. Externally pressurizing the bellows eliminates pressure instability as a limitation to the design and permits the absorption of large amounts of axial expansion. Our QC department conducted various NDT examinations (X-Rays, PMI, Penetrant Tests, and Hydro Tests). Also provided were “weld maps” and MTR’s for client review and inspection. At U.S. Bellows, we are constantly developing and assisting client engineers in this effort toward decarbonation by designing innovative products to accommodate new and unusual design specifications.

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Custom Single Ply X-Flex Bellows Designed for a Manufacturing Company of Flooring Products

August 16, 2021

Custom Single Ply X-Flex Bellows Designed for a Manufacturing Company of Flooring Products

U.S. Bellows customized single-ply X-Flex bellows for the world’s largest manufacturer and supplier of flooring products with locations throughout the U.S. Flooring products such as carpet, ceramic tile, natural stone, laminate, vinyl, and hardwood require many of the same piping systems as traditional indoor plants for the automotive, food processing, semiconductor, textile, and pulp & paper industries. Plants that manufacture flooring are usually quite large requiring large tracks of land. As a result, the “pipe runs” can extend hundreds of feet requiring various types of expansion joints to accommodate the movement of the pipe while also relieving stresses in the piping system. Externally pressurized expansion joints are especially suited for piping systems that require large amounts of axial compression or extension. In externally pressurized pipe expansion joints, the bellows elements are arranged so that the media flow is on the external surface of the bellows. Externally pressurizing the bellows eliminates pressure instability as a limitation to the design and permits the absorption of large amounts of axial expansion. These expansion joints are fabricated with 304 stainless steel bellows, flanges, and pipe. They are designed for 300°F at 14.7 psig with an 8″ extension. The units are 3″ pipe x 40″ long, and 4″ pipe x 40″ long. The expansion joints were hydro-tested and underwent NDE quality control inspection tests such as liquid penetrate inspection (LPI) before shipment.

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Externally Pressurized Expansion Joint for a Reformer Unit in Saudi Arabia

October 14, 2019

Usbellows externally pressurized expansion joint 139221

 

 Type:  Externally Pressurized Expansion Joints
 Size:  59 9/16″ Long | 3″ Nominal Pipe Size
 Material:  304 Stainless Steel | Chrome-Moly
 Design:  1020°F Operating Temp. @ 140 psig | 11.75″ Axial
 Testing:  100% Dye-Penetrant | X-Ray | Hydro-tested

This externally pressurized expansion joint was designed by U.S. Bellows for a reformer unit at a refinery in Saudi Arabia. It is 59 9/16″ long with a nominal pipe size of 3″. The bellows were fabricated from 304 stainless steel and the pipe, flanges and hardware from chrome-moly. The unit is designed for an operating temperature of 1020°F at 140 psig. 11.75″ of axial compression and 1.25″ of extension. The expansion joint was 100% dye-penetrant tested, x-ray tested the bellows, and hydro-tested prior to shipment

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36″ Dia. Externally Pressurized Expansion Joints Designed for a Power Plant in Venezuela

October 29, 2018

36” Dia. Externally Pressurized Expansion Joints Designed for a Power Plant in Venezuela

Type: Externally Pressurized Expansion Joints
Size: 36″ I.D. | 56″ OAL | 10″ Face-to-Face
Design: Hastelloy C-276 Bellows | A36 CS Flanges & Spool
Material: 60 PSIG at 572°F | 9.75″ Axial Compression
Testing: 100% Dye-Penetrant | Hydro-Tested

U.S. Bellows custom designed externally pressurized expansion joints for a power plant in Venezuela. The units are 56″ in overall length and have a 36″ inside diameter. The bellows are fabricated from Hastelloy C-276 and the flanges and spool are A36 carbon steel. The units are designed for an operating pressure of 60 psig at 572°F and 9.75″ of axial compression. The expansion joints were 100% dye-penetrant tested and hydro-tested prior to shipment.

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Custom Designed Externally Pressurized Expansion Joints for a Flare Header Application at a Mississippi Refinery

February 19, 2018

Custom Designed Externally Pressurized Expansion Joints for a Flare Header Application in Mississippi

Type: Externally Pressurized Expansion Joint
Size: 133 11/16″ and 120.5″ Long | Both Have 42″ Pipe Dia.
Design: Inconel 625 | Carbon Steel
Material: 450°F at 108 psig & 31″ and 25″ Axial Compression
Testing: Hydro-tested at 167, PMI, 100% X-Ray, and Dye-Penetrant

U.S. Bellows custom designed these externally pressurized expansion joints for a flare header application at a refinery in Mississippi. One unit measures 133 11/16″ long and the other measures 120.5″ long and both have a 42″ pipe diameter. The bellows were fabricated from Inconel 625 with carbon steel pipe per A671-CC-60 CL.22, and 2-coat paint system. They are designed for an operating pressure of 108 psig at 450°F with the 31″ and 25″ of axial compression. All alloy material was PMI inspected. The units were hydro tested at 167 psig, 100% dye-penetrant tested, and the bellows and pipe weld seams were 100% X-ray tested prior to shipment.

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Externally Pressurized Expansion Joints for Pneumatic Conveying and Filtration at a Manufacturing Facility in Missouri

September 18, 2017

Externally Pressurized Expansion Joints for Pneumatic Conveying and Filtration at a Manufacturing Facility in Missouri

Type: Externally Pressurized Expansion Joints
Size: 4″ Diameter & 57″ Length
Design: 304 Stainless Steel
Material: 500°F at 30 psig, 189 lb./in. Spring Rate & 8″ Axial
Testing: Dye-Penetrant and Air Soap & Bubble

U.S. Bellows custom designed these externally pressurized expansion joints for pneumatic conveying and filtration at a manufacturing facility in Missouri. The units were completely fabricated for 304 stainless steel. They are 4″ in diameter and 57″ in length. These expansion joints are designed for an operating temperature or 500°F at 30 psig, with a spring rate of 189 lb./in. and can absorb 8″ of axial compression. The units were 100% dye-penetrant and air soap & bubble tested prior to shipment.

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Externally Pressurized Expansion Joints Designed for a Hot Water Piping System at an Air Force Facility

August 15, 2016

Externally Pressurized Expansion Joints Designed for a Hot Water Piping System at an Air Force Facility

Type: Externally Pressurized Expansion Joints
Size: 4″ Diameter / Single: 50″ and double: 87″ Face-to-Face
Design: Inconel 625 Bellows / Carbon Steel
Material: 400°F / 400 psig
Testing: Hydro-tested at 600 psig

These single externally pressurized expansion joints were custom designed by U.S. Bellows for a hot water piping system at an Air Force facility in California. All units are 4″ in diameter, with the single units having a length of 50″ face-to-face and double units having a length of 87″ face-to-face. The expansion joint’s bellows were fabricated from Inconel 625 and all other components from carbon steel. They are designed for a temperature of 400°F at 400 psig with 4″ and 8″ of axial compression. All units were hydro-tested at 600 psig prior to shipment.

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What are the different types of expansion joints?

In general, there are fabric, metallic, and rubber expansion joints. At U.S. Bellows, we manufacture:

Metallic Expansion Joints

  • Single Expansion Joints
  • Hinged Expansion Joints
  • Gimbal Expansion Joints
  • Universal Expansion Joints
  • Elbow Pressure Balanced Expansion Joints
  • In-line Pressure Balanced Expansion Joints
  • Externally Pressurized Expansion Joints
  • Toroidal Expansion Joints
  • Thick Wall Expansion Joints
  • Slip-type Expansion Joints
  • Rectangular Metallic Expansion Joints
  • Refractory Lined Expansion Joints

Fabric Expansion Joints

* Rubber (Neoprene) Expansion Joints

Single tied metallic expansion joint
Metallic Expansion Joint
111372a2
Fabric Expansion Joint
93348a1
59″ Neoprene Expansion Joint
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