Construction
Compensating cam-and-spring mechanism in a welded steel frame, supplied as hanger-suspended or base-mounted units, with load adjustment and travel scale. Each unit is bench-tested and locked at the cold position before dispatch.
- Load deviation ≤6% across the full travel range
- Travel up to 300 mm and above for special cases
- Adjustment allowance typically ±10% of design load
- Hydrotest stops and transport locks fitted as standard
Typical Specification
| Item | Range / Detail |
|---|---|
| Design practice | MSS SP-58; project specs on request |
| Load range | ~0.5 kN to 200+ kN per support |
| Travel | 25–300 mm typical |
| Load deviation | ≤6% |
| Testing | Load-travel bench test report per unit |
Where they are used
Main steam and hot reheat lines in power plants, high-temperature process lines, and any location where a variable hanger's load change would overload the pipe or connected equipment.
Engineering resources
- Variable vs constant spring hangers: which one does your line need?
- How to select a variable spring hanger — worked example
- MSS SP-58 hanger types A–G, explained
- How to read a hanger schedule, column by column
- Spring hanger installation guide — travel stops, hydrotest & commissioning
Frequently asked questions
What information do you need to quote a constant force hanger?
Hot load (operating load), total vertical travel with direction, pipe size and temperature, and whether the unit is hanger-suspended or base-mounted. A hanger schedule or marked-up stress isometric is ideal — we size each support and return a data sheet per tag.
Do you design to MSS SP-58?
Yes. Constant force hangers follow MSS SP-58 design practice, with load deviation held within 6% across the full travel range, and we work to project specifications on request. Hanger-suspended and base-mounted arrangements are available.
What surface finishes are available?
Primer finish as standard on the welded steel frame, with epoxy systems or hot-dip galvanizing to project specification — HDG is common for GCC coastal and outdoor plant environments.
Do you supply complete assemblies, and is there a minimum order?
Each tag can be delivered as a complete assembly — constant support unit plus rods, clamps and building attachments. Constant hangers are engineered items quoted per project, so any minimum order considerations are confirmed at quotation.
What documentation is provided with an order?
A load-travel bench test report per unit, a data sheet per support tag, dimensional and inspection reports, and material certificates on request, plus export packing documents. Units ship with hydrotest stops and transport locks fitted.