This 30 foot long tied universal thick wall expansion joint is fabricated from carbon steel with 316 stainless steel bellows. The bellows are fabricated from 1/4″ thick flanged and flued heads. It is designed for an axial movement rate of 1/2″ with a lateral movement rate of 1-13/16″. The expansion joint was 100% x-ray tested and air & soap bubble tested prior to shipping.
Expansion Joint > Blog Articles
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.
One of U.S. Bellows’ customer’s existing expansion joints failed and caused a plant shut down. They required an immediate replacement joint. This universal expansion joint order was placed, designed and fabricated in just one day. The order came in at 8:30 am on Saturday, Labor Day weekend and was shipped at 4:00 pm, which minimized the time of the plant shut down. This universal expansion joint is 96″ in overall length, 20″ inside diameter and can absorb 3.25″ lateral movement. A 100% dye-penetration test and a hydro-test were performed to ensure quality.
These expansion joints were fabricated from ASTM-A-240 Type 321 stainless steel bellows and liners. The shell material is ASTM-A-516 Grade 70. They are 32 diameter with an overall length of 26. Each joint weighs 280 lbs. They were designed for 150 PSIG at 650F with a travel capacity of 0.33 axial compression and 0.08 lateral deflection. These expansion joints absorb differential expansion between the shell side and tube side of a heat exchanger. They were hydrostatically tested to 208 PSIG to comply with the Japanese code, Ministry of Health, Labor and Welfares (MHLW) and the ASME Pressure Vessel Code Section VIII.
U.S. Bellows, Inc. designed and fabricated this refractory lined universal expansion joint for an FFC unit in India. This is a 70″, outside diameter, tied refractory-lined universal expansion joint with two-ply Inconel® 625 LCF bellows, A516 weld ends and spool, and a 4″ thick refractory lining per UOP specifications. This joint was designed at 51 PSIG and 1400 degrees F. Bellows long seam welds were 100% x-rayed and 100% dye-penetrant before and after forming. It was also pneumatic tested at 57 PSIG. The refractory lining was dried out per UOP specifications.
The photograph above shows a rectangular fabric expansion joint in the final stages of assembly. The fabric “belt” is being attached to the metal frames. These expansion joints are inserted in metal ducts which carry hot gases at low pressures. Layers of different materials are selected to make a “belt” which will function at the high temperatures required.
U.S Bellows, Inc. is now offering a new web-based 24×7 instant response service in order to fulfill requirements in emergency/ quick-turn situations.
The web-based 24×7 Quick-turn/ Emergency service is an invaluable and unique addition to the company’s variety of services. The quick turn/ emergency form found at http://www.usbellows.com/emergency.html is easy to read and simple to complete. Upon submission of name, email address, telephone number, fax number and brief and detailed problem description, the U.S. Bellows’ “on-call” engineering team is immediately notified via electronic pager and e-mail. U.S. Bellows’ engineer contacts the customer within 30 minutes to obtain further information and to provide a problem assessment. Once an action plan has been formulated, the U.S. Bellows’ engineer does the necessary design work and then assembles an emergency manufacturing team to build the product. This process, from notification to shipment, can be done by U.S. Bellows in less than 24 hours.
Since the creation of the new online 24×7 quick turn/ emergency form, there have been a number of customer success stories. Customers have a strong appreciation for the ability of U.S. Bellows to provide immediate attention and service to emergency matters. The web-based 24 x 7 Quick-turn/Emergency service is one of the innovative technology-based services provided by U.S. Bellows.
This photo shows a 42 inch bellows made by PT&P being tested by Leak Detection Specialist Inc. After sealing the bellows a full vacuum is pulled on the inside, then helium is sprayed over the surface of all welds. A pump pulls any gas which leaks to the interior of the bellows to a special mass spectrometer designed to detect the helium. If helium is detected, the point of the surface where it was sprayed is marked for repair. When no leaks are found, the flow rate of helium to the mass spectrometer is measured against a standard for aluminum, in this case 0.000001 cc/sec. Helium molecules are so small, they will penetrate aluminum at a slow rate when the pressure difference of a full vacuum is applied.
A mass spectrometer functions by accelerating a narrow beam of ions of a gas sample through a magnetic field. When they reach the magnetic field, the amount they are deflected depends on their charge-to-mass ratio. In this application the detector is set to record helium ions. In order to measure the flow rate of the helium when no leaks are detected, the entire system is sealed in a plastic “bag”. LDS can measure helium flow rates as small as 0.00000001 cc/sec.
The 24” diameter hinged expansion joint shown above was designed to absorb lateral deflection and limited angular rotation in one plane only. They were supplied by U.S. Bellows, Inc. for an emergency shut down delivery requirement.