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Pipe Expansion Joint Product Testing

U.S. Bellows, Inc. does extensive physical testing ranging from X-Ray tests and Hydrotests to Helium Leak tests (using a mass spectrometer.) Each bellows and pipe expansion joint unit goes through in-process quality control using a system of travelers. Final in-house inspection and testing is performed prior to shipping. Our manufacturing shop also has ASME Section VIII CODE certification.

Fatigue Testing (also known as Cycle Testing)
Fatigue Testing (also known as cycle test) Fatigue testing is essentially verifying how many cycles a bellows can withstand before failing. The bellows is placed on the "cycle-test machine" and bolted to a hydraulic plunger. Each cycle is counted as the bellows is compressed and returned to neutral.
Burst Testing
Burst Testing The objective of the burst test is to determine the ultimate pressure resistance, primarily conducted on bellows. Normally, hydraulic pressure is slowly increased until failure occurs. Pressure balanced pipe expansion joints are designed to maintain a constant volume through the use of a compensating bellows.
Dye Penetration Testing
Dye Penetrant Testing Liquid dye and a white powder observant are used to locate leaks or cracks in the bellows attachment welds. This test is performed for long seam welds before and after forming the bellows.
Hydrostatic Testing (also known as Hydro-testing)
Hydrostatic Testing (also known as hydro test) During a hydro-test, the bellows is completely filled with liquid until a desired pressure is reached. The bellows is pressurized for 30 minutes to locate leaks or cracks in the welding.
Helium Leak Testing
Helium Leak Testing The bellows is filled with pressurized helium and then "sniffed" to detect leaks indicated by a mass spectrometer.
Additional Product Testing:
Ultrasonic Testing
Radiography Testing
PMI Testing
Pneumatic Testing
Magnet Particle Testing


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Contact Us: +1 (281) 241-9418 Toll Free: (855) 591-0906 Fax: +1 (713) 731-8640
Our Parent Company: Piping Technology Pipe Supports, Pipe Clamps, Pipe Hardware & Insulated Pipe Shoes
Fellow Subsidiaries: Sweco Fab: ASME Vessels, Pig Launchers, Duct Work, Strainers & Spectacle Blinds
 Pipe Shields: Pre-Insulated Pipe Supports, Slides, Guides & Anchors

Fronek Anchor/Darling
: Snubbers, Sway Struts & Sway Braces

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