Inline Pressure Balanced Expansion Joints — The Expansion Joints Blog

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In-line Pressure Balanced Expansion Joints

May 16th, 2011 Comments off

When applications exist where anchoring is impractical for structural or economic reasons, such as an elevated piping application or short, straight pipe runs between two large vessels, the in-line pressure balanced expansion joint is a powerful solution to a difficult design problem. The principle of this type of unit is essentially the same as the pressure balanced elbow type, in that the pressure thrust from the two flow bellows is compensated by the pressure thrust generated by the larger balancing bellows.

In-line Pressure Balanced Expansion Joint Drawing

The in-line pressure balanced expansion joint is designed to absorb axial movement and/or lateral deflection while restraining the pressure thrust by means of tie devices interconnecting the line bellows with outboard compensating bellows also subjected to line pressure. Each bellows set is designed to absorb the axial movement and usually the line bellows will absorb the lateral deflection. This type of expansion joint is used in a straight run of piping.

The in-line pressure balanced expansion joints are obviously more expensive than the simpler types; however, they may result in a lower overall system cost when the elimination of main anchoring is considered. This expansion joint can also be used to replace pipe loops, and it’s cost advantage may be seen in reduced pumping energy by the elimination of the loop’s elbow-generated pressure losses. This may also allow reducing the pipe size for the entire system. (View our article on the Advantages of an “Expansion Joint” versus a “Pipe Loop”)

Examples of In-line Pressure Balanced Expansion Joints:

14" In-line Pressure Balanced Expansion Joint with PTFE Lining on all Internal Surfaces Designed for a Highly Corrosive Application

14″ In-line Pressure Balanced Expansion Joint with PTFE Lining on all Internal Surfaces Designed for a Highly Corrosive Application

 

63" In-line Pressure Balanced Expansion Joint with Refractory Lining Designed with Inconel 625 LCF Bellows for a Clean Fuels Project

63″ In-line Pressure Balanced Expansion Joint with Refractory Lining Designed with Inconel 625 LCF Bellows for a Clean Fuels Project

Examples of Common Types of Expansion Joints

January 26th, 2011 Comments off

Single tied expansion joint fabricated entirely of stainless steel for a pipeline in Alaska.Single Tied Expansion Joints for a Pipeline in Alaska

The expansion joint assemblies are fabricated entirely from stainless steel with a design pressure of 50 PSIG. They are designed with tie rods that do not permit axial movement, but allow for lateral movement up to 1/2″. The expansion joints will be used on a process line that contains exhaust gas and hydrocarbon vapor at a low concentration. It will connect an oil tank with a vapor control system.

View Information on Single Expansion Joints

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Universal metallic expansion joint with 300 lb. raised face stainless steel flanges.Universal Metallic Expansion Joints with 300 lb. Raised Face Stainless Steel Flanges

The expansion joint assemblies are fabricated for a 12″ pipe and are designed for 2-1/2″ lateral movement. The design pressure is 276 PSIG with a design temperature of 626°F. 316L stainless steel was used for the bellows and tie rods. The expansion joints include 300 lb. raised face stainless steel flanges to accommodate low spring rate requirements.

View Information on Universal Expansion Joints

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Hinged expansion joints with refractory lining.Hinged Expansion Joints with Refractory Lining

Hinges cause the unit to bend in a single plane. The hinge mechanism is designed to accept the full pressure thrust.

  • Design Pressure: 75.4 PSIG
  • Design Temperature: 1400°F
  • 100% X-ray Tested
  • Pneumatically Tested weld seams to 83 PSIG

View Information on Hinged Expansion Joints

View Information on Refractory-lined Expansion Joints

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Elbow pressure balanced expansion joints fabricated for a 36" pipe.Elbow Pressure Balanced Expansion Joints

The expansion joints are fabricated for a 36″ pipe and are designed with Inconel® 625 grade LCF bellows. They include a liner provided with drain holes to prevent accumulation of corrosive condensation.

View Information on Pressure Balanced Expansion Joints

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Inline pressure balanced expansion joints designed to balance 48,000 lb. of pressure thrust.Inline Pressure Balanced Expansion Joints

- Design: 125 PSIG, Temperature: 244°F

- 304 SS Bellows, Flanges & Liners

- Designed to Balance 48,000 lb. of Pressure Thrust

View Information on Inline Pressure Balanced Joints

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Externally Pressurized Expansion JointsExternally Pressurized Expansion Joints

These expansion joints are fabricated for a piping system in a steam plant. They include 304 SS bellows and carbon steel shell and flanges, and are designed for 150 PSIG and 350°F.

View Information on Externally Pressurized Joints

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Gimbal expansion joint with floating rings designed for a 55" diameter overhead vapor line at a refinery.

Gimbal Expansion Joint with Floating Rings

These expansion joints are designed for a 55″ diameter overhead vapor line at a refinery. The overall length is 310″ and the bellows are fabricated from 625 LCF. The expansion joint is designed for 50 PSIG and 1075°F.

View Information on Gimbal Expansion Joints

14" NPS Inline Pressure Balanced Expansion Joint for a Highly Corrosive Application

September 7th, 2010 Comments off

14" NPS Inline Pressure Balanced Expansion Joint for a Highly Corrosive Application

This inline pressure balanced expansion joint is fabricated from ASTM A-240 321 SS bellows and ASTM A-105 carbon steel flanges. Due to its highly corrosive application, all of the internal surfaces are coated with a PTFE lining to resist corrosion. The expansion joint is designed for 51 PSIG at 167°F. and was hydro-tested at 77 PSIG prior to shipping.

63" In-line Pressure Balanced Expansion Joints with Refractory Lining

June 21st, 2010 Comments off
Inline Pressure Balanced Expansion Joints with Refractory Lining

In-line Pressure Balanced Expansion Joints with Refractory Lining

Inline Pressure Balanced Expansion Joints with Refractory Lining

Refractory Lining

The in-line pressure balanced expansion joints were manufactured for a clean fuels project in India. They are fabricated with Inconel 625 LCF bellows and ASTM A516 GR 70 carbon steel was used for the shell. The inside is lined with insulating and abrasion resistant refractory. The expansion joints were pressure tested with air at 15 PSIG prior to shipment.

Inline Pressure Balanced Expansion Joints

March 7th, 2007 Comments off
Inline Pressure Balanced Expansion Joints

Inline Pressure Balanced Expansion Joints

Inline Pressure Balanced Expansion Joints

Inline Pressure Balanced Expansion Joints

Inline Pressure Balanced Expansion Joints

Inline Pressure Balanced Expansion Joints

U.S. Bellows, Inc. Designed and Fabricated Inline Pressure Balanced Expansion Joints

- 14″ ID Inline Pressure Balanced Expansion Joints
- 304 Stainless Steel Bellows, Flanges and Liners
- Designed to Balance 48,000 lb. of Pressure Thrust
- Design Pressure: 125 PSIG
- Design Temperature: 244°F
- 100% Dye-Penetrant Tested
- Hydro-Tested at 188 PSIG

24" In-Line Pressure Balanced Expansion Joints for a Petrochemical Plant in Venezuela

November 1st, 2002 Comments off
24" Inline Pressure Balanced Expansion Joints for a Petrochemical Plant in Venezuela

24" Inline Pressure Balanced Expansion Joints for a Petrochemical Plant in Venezuela

U.S. Bellows, Inc. fabricated three, 24″, inline pressure balanced expansion joints for a petrochemical plant in Venezuela.

In order to absorb partial axial and lateral movements, these expansion joints were designed at 175 PSIG and 610ºF. The bellows are composed of Inconel® 625LCF material and the flanges and liners are constructed from SA516 Grade 70 material.

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