AS Single Metal Expansion Joints
FIT, FORM and FUNCTION
Single metal expansion joints are engineered devices designed to absorb axial, lateral, and angular movements in piping systems resulting from thermal expansion, contraction, or mechanical forces. Comprised of a single bellows element, these joints efficiently accommodate movements along the pipeline axis, making them ideal for straightforward applications where directional changes are minimal. Their robust construction and straightforward design enable reliable operation in a wide range of industrial settings.
AS – Single Expansion Joint Fit:
- Bellows may be attached or linked to piping flanges, pipe, or other typical
industrial connections.
- End connections may conform to standards such as ASME B16.5, ASME B36.10, or customer designed.
- Fittings may be the same at each end or different.
AS – Single Expansion Joint Form:
- Single circular metal bellows, or 1 or more convolutions.
- Typical dimensions of ½” ANSI NPS to 240” ID. Overall length may vary,
typically within the range of 6” to 30”. - Bellows may include reinforcement or controlling members
- Convolutions may be U shaped or toroidal
- Additional accessories may be incorporated such as load bearing restraints, movement limiters, protection devices.
AS – Single Expansion Joint Function:
- Absorbs piping (thermal) movement, primarily axial but could include lateral
and angular movements. - Movement amplitude varies, typically within the range of 1/32” to 6”.
- Movement frequency may be extreme low cycle (1 per year), or high cyclic (such as vibration at 60 Hz).
Metal Bellows Catalog
This catalog contains excellent technical references to help you understand how expansion joints work, how to apply them, and how to select the expansion joint best suited for your application.
Features
- Simplest, most economical design
- Accepts axial, lateral, angular movements
- Versatile and common throughout all industries
- Use of tie rods contain pressure thrust. Can also include hinges or gimbals
Applications
- The unrestrained EJ is appropriate for any application where pressure thrust can be handled by external anchorage.
Operating Range
- Full vacuum to 2000 psig depending on size
- Cryogenic to 1650°F+
- Sizes from 1” NPS to > 240” NPS
Materials
- 3XX Series Stainless Steel
- Nickel Alloys
- Carbon Steel
- Titanium
- Zirconium
INDUSTRIAL APPLICATIONS
These expansion joints are utilized across diverse industries worldwide. In power generation, they are commonly installed in steam and condensate lines to handle temperature-induced expansion and contraction. The chemical processing and petrochemical sectors rely on single metal expansion joints to protect pipelines transporting hazardous or volatile fluids, ensuring system safety during pressure and temperature fluctuations. Additionally, they are used in water treatment facilities, pulp and paper mills, and industrial HVAC systems, where they help maintain the integrity of process piping by compensating for thermal movements and reducing stress on fixed anchors and supports.
Case Studies - Industrial Applications
Download and learn about how SF Pathway Engineers and manufactures a comprehensive range of Engineered Expansion Joints for all applications.
Range of Expansion Joint Solutions
SF Pathways Manufactures a comprehensive Range of Engineered Expansion Joints for all applications.
AS -Single Metal Expansion Joints
AU – Universal Metal Expansion Joints
PB – Pressure Balanced Expansion Joints
XP – Externally Pressurized Expansion Joints
RT – Rectangular Expansion Joints
