Power Plant Variable Spring Hanger

In power generation plants, managing thermal expansion in high-pressure steam, feedwater, and blowdown piping demands reliable variable support that prevents excessive nozzle loading and pipe stress. The Power Plant Variable Spring Support is engineered to absorb vertical displacement while providing a controlled variable reaction force based on preset spring rates. The same core technology is applied across our broader portfolio: Industrial pipeline Variable Spring Support units serve general process facilities with standardized load bands, travel stops, and corrosion-resistant finishes; Oil and Gas Variable Spring Support models are specially coated for offshore, sour, and cryogenic service conditions; and Refinery Variable Spring Support versions handle high-temperature reactor, transfer, and reforming lines with alloy spring materials. Each hanger is factory preset, load tested, and tagged to ensure accurate field installation and long-term performance under cyclic thermal loads.

The Power Plant Variable Spring Hanger uses a precision-wound helical spring mechanism housed in a welded steel casing. As the supported pipe moves vertically due to thermal expansion, the spring deflects and the load changes linearly according to Hooke’s law. This variable response is suitable for moderate-movement piping where small load variations remain within allowable nozzle stress limits. The hanger can be installed in rod-hung, floor-mounted, or ceiling-mounted orientations, with preset upper or lower travel stops matched to the calculated cold-to-hot displacement. Load adjustment is accomplished through a threaded turnbuckle or load column, and a visible travel scale on the casing allows quick verification of pipe position during operation and shutdown. These units are widely applied on steam extraction lines, boiler feedwater risers, reheater piping, and turbine bypass systems.

• Load range: 500 N to 50,000 N (0.5 kN to 50 kN) in 12 standard frame sizes
• Travel range: 25 mm to 300 mm; preset up or down with 0–100% cold position
• Spring material: 60Si2Mn or 50CrVA alloy steel, shot-peened and preset to prevent relaxation
• Casing material: ASTM A36 carbon steel or A240 TP304 stainless steel
• Finish: hot-dip galvanized (85 µm minimum) or two-part epoxy paint (150 µm minimum)
• Design standards: MSS SP-58, MSS SP-69, GB/T 17116.1, and ASME B31.1 power piping code
• Operating temperature: -20°F to 750°F (-29°C to 399°C); high-temperature models up to 1050°F (566°C)
• Connection types: threaded rod top/bottom, beam clamp, welded lug, or clevis
• Load variation: ≤10% over full travel for standard spring rate; custom rates available on request
• Quality testing: 100% load verification, spring constant check, and travel stop calibration

For project-specific requirements, our engineering team can provide custom spring rates, extended travel, and non-standard connection details without affecting lead time.