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Construction Details

     This website outlines selection and installation of our Metal Bellows type Expansion Joints and pump connectors for use in pipe lines and process vessels to absorb motion in the system. Our products incorporate the latest recommendations of the Expansion joint Manufacturers Association.

Unaflex® is one of this country's leading Expansion Joint Manufacturers. Our expertise and manufacturing capabilities include a full range of Rubber Expansion Joints, Flue Duct, Expansion Joint Sound Absorbers, Custom Rubber Hose, Metal Hose, Pump Connectors an Metal Bellows Type Expansion Joints. No other manufacturer in the United States has the capabilities of Unaflex®.


Unaflex® is a Full Service Manufacturing Organization offering a full range of products in the highest grades of stainless steel as well as more exotic alloys including Monel, Inconel and Hastalloy. Quality control is rigorous and complies with requirements of MIL-I-45208 and MIL-Q-9858. Our Expansion Joints also comply with U.S. Coast Guard requirements. Certification is available.


CONSTRUCTION DETAILS 

BELLOWS PROFILE

Unaflex® “MATCHLESS” Expansion Joint Bellows are produced from fully annealed type 321 stainless steel sheet stock rolled into a tube and seam welded. The latest technology in forming the corrugations of our bellows is employed. Other alloys such as Inconel, Monel, Titanium and 316 stainless steel may be provided from our extensive inventory or raw materials.

APPLICATIONS:

  • Diesel Engine Exhaust

  • Diesel Generator Exit and Boiler Flue

  • High and Low-Pressure Turbine Piping

  • Main Feed Pump Suction

  • Propeller Shaft Air System

  • Condensate Pump Suction

  • Saturated and Superheated Steam

 

A. Fixed Flanges 
Type 44 Ends are plate steel flanges conforming to ANSI dimensions welded 
directly to the integral ends of the bellows. Stainless steel and other alloys are 
available when specified.
B. Floating Flanges 
Type 66 Ends are flat face plate flanges conforming to ANSI dimensions 
secured to the integral end of the bellows flared (Vanstoned) to retain the 
flanges. This allows the use of carbon steel flanges when the only wetted parts 
will be stainless steel of the bellows. Also permits easy bolt hole alignment.
C. Welding Nipples
Type 22 Ends are carbon steel welding nipples with ANSI standard bevel. 
Schedule 40 pipe size is used through 12” diameters. 1/4” wall thickness for 
sizes over 12” unless otherwise specified.
DEFINITION OF MOVEMENT

AXIAL COMPRESSION

Reduction of face-to-face dimension measured along the axis.

AXIAL ELONGATION

Increase of face-to-face dimension measured along the axis.

TRANSVERSE OR LATERAL MOVEMENT

The movement of the joint perpendicular to the axis.

VIBRATION ABSORPTION

The movement of the joint due to vibrations which are effectively intercepted and insulated against transmission to remainder of systems.

ANGULAR MOVEMENT

The displacement of the longitudinal axis of the joint from its initial straight line position (a combination of axial compression).

 

 

ANCHORING AND GUIDING To assure satisfactory performance of an expansion joint in a piping system, it is imperative that the system be properly anchored and guided. Anchors must be designed to withstand the thrust forces, spring forces and guiding frictional forces of an expansion joint. Pressure thrust must be calculated by using the highest internal line pressure which the system will experience. This is frequently the test pressure. Spring force can be calculated from the expansion joint design data on pg 6-9 of out catalog.

 


CYCLE LIFE

The cycle life of an expansion joint is the number of stress cycles endured, at operating conditions. A stress cycle is defined as one complete movement of the expansion Joint from initial to extreme position and return.

"Matchless" Expansion joints are rated for 7000 cycles of life at maximum operating pressure and temperature if properly installed. For higher cycle life requirements, consult Unaflex Engineering Dept.

Elevated temperatures reduce both rated movement for a given cycle life and pressure capabilities. To compensate multiply both rated movement and maximum pressure by the temperature compensating factor in the chart to the right.

 

TEMPERATURE º F. TEMPERATURE COMPENSATING FACTOR
Room Temp.
200
300
1.00
.86
.80
400
500
600
.78
.77
.74
700
800
900
.70
.66
.62
1000
1100
1200
.60
.58
.55
1300
1400
1500
.46
.35
.26

*All information subject to change without notice.

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