Variable spring hangers, also known as variable spring supports, are the most widely used type of pipe support in industrial piping systems. They provide a supporting force that varies proportionally with spring deflection as the pipe moves vertically due to thermal expansion or contraction. For applications where thermal displacement is moderate and a controlled amount of load variation is acceptable, variable spring hangers offer a cost-effective and compact solution compared with constant spring supports.
Manufactured by Yangzhou Tianshun Pipeline Technology, our variable spring hangers use high-grade alloy steel coil springs housed in a robust steel casing. As the pipe moves upward or downward from its installed position, the spring compresses or extends accordingly, changing the reaction force in direct proportion to the travel distance and the spring rate. Each unit is calibrated at the factory to the specified cold load, hot load, and travel direction, ensuring predictable performance from installation through operation.
| Variable Spring Hanger Spec Table | Example |
| Hanger Type / Configuration | Type A, B, C, D, E, F, G |
| Spring Size / No. | No. 0 - No. 22 |
| Travel Range | 30mm, 60mm, 90mm, 120mm 180 mm |
| Operating Load | 0.2 kN - 400 kN |
| Installed Load (Cold Load) | kN / kgf |
| Operating Load (Hot Load) | kN / kgf |
| Movement Direction | Upward / Downward |
| Variability (%) | ≤ 25% (Standard) |
| Surface Treatment | Hot Dip Galv/ Painted |
| Housing Material | Carbon Steel (Q235/Q355) |
A key parameter when selecting a variable spring hanger is the load variation percentage — the difference between cold and hot load divided by the operating load. Most engineering specifications require this value to remain below 25% for general service and below 6% for critical equipment connections. Where displacement is large enough that load variation would exceed acceptable limits, constant spring hangers are specified instead.
Our standard variable spring supports are designed to keep load variation within typical project limits across their full working range, and each unit is clearly marked with its spring rate, cold load setting, and travel direction for straightforward installation and commissioning.
We offer variable spring hangers in multiple mounting configurations including top-suspended, base-mounted, and side-mounted designs, covering load capacities from approximately 0.02 kN up to 40 kN across standard spring sizes. Standard travel ranges include 30 mm, 60 mm, 90 mm, 120 mm, and 150 mm, with special travels available on request.
Spring elements are produced from 60Si2Mn or 50CrVA spring steel, and housings are available in hot-dip galvanized, epoxy-painted, or stainless-steel finishes for corrosive environments. Standard units are rated for ambient operating temperatures from -20°C to +200°C, with high-temperature alloy spring options available for extreme heat applications such as furnace and boiler piping.
Each variable spring support is fitted with a travel scale, load indicator, and upper and lower stop plates. Threaded rod connections at the top and bottom allow for simple vertical adjustment during installation, and load settings can be verified on site against the nameplate data.
Our variable spring hangers are manufactured in accordance with GB/T 17116.1/.2/.3 and are fully interchangeable with international standards including MSS SP-58, ASME B31.1, ASME B31.3, and EN 13480-3. Material traceability is maintained throughout production, and all springs undergo presetting and load testing before assembly.
For specialized projects, we supply stainless steel spring hangers, insulated pipe support assemblies, and units with special coatings for offshore, marine, or desalination service. We also manufacture pre-insulated pipe supports and pipe shoe supports that integrate directly with our variable spring hanger range for complete line support solutions.
Variable spring supports are installed on virtually every type of process and utility piping where vertical thermal movement occurs. Common applications include power plant steam and feedwater lines, refinery process piping, chemical plant heat exchanger loops, district heating networks, and HVAC systems in large commercial buildings. They are also used alongside rigid pipe supports on lines where only selected points require movement compensation.
For piping systems with dynamic loads such as water hammer, seismic events, or pump vibration, variable spring hangers are often combined with hydraulic snubbers that restrain dynamic movement while allowing free thermal displacement. Where thermal growth is too large for a variable unit, we recommend upgrading to constant spring hangers at those specific support points.
Our broader pipe support portfolio includes constant spring supports, rigid hangers and struts, pipe shoe supports, pre-insulated pipe supports for cold and cryogenic lines, and hydraulic snubbers. For piping systems that also require axial, lateral, or angular movement absorption, we manufacture metal bellows expansion joints, rubber expansion joints, and fabric expansion joints that can be specified together with our spring supports as a single-source solution.
Every variable spring hanger is load-tested and dimensionally verified in our in-house testing facility before shipment, under our ISO 9001:2015 quality management system. We support customers from initial spring selection and load calculation through installation guidance and after-sales service. Inquiries receive a response within 24 hours, and standard production lead times range from 10 to 20 working days depending on volume and configuration. With over 14 years supplying pipe supports and expansion joints to projects in more than 45 countries, we deliver both catalog-standard and custom-engineered units to EPC contractors and end users globally.
What does "load variation percentage" mean on a variable spring support?
Load variation is the difference between the cold (installed) load and the hot (operating) load, expressed as a percentage of the operating load. It is determined by the spring rate multiplied by the thermal travel, divided by the operating load. Most project specifications limit this value to 25% maximum for standard piping.
Can a variable spring hanger be installed in any orientation?
No. Variable spring hangers are designed for vertical movement and must be installed with the spring axis vertical. Horizontal or angled installation will cause binding, incorrect load transfer, and premature wear. For horizontal loads or lateral restraint, rigid struts, pipe shoes, or snubbers should be specified separately.
What is the maximum temperature your variable spring hangers can handle?
Standard carbon steel units with alloy steel springs are rated for continuous service up to approximately 200°C. For higher-temperature piping such as high-pressure steam lines or boiler connections, we offer high-temperature spring materials and insulated support configurations. Contact our engineering team with your operating conditions for proper material selection.
Do you provide spring selection calculations?
Yes. Our engineering team can assist with spring selection if you provide pipe size, operating weight, thermal displacement magnitude and direction, and any project specification requirements. We can also review existing support schedules and recommend the appropriate variable or constant spring support for each location.
What is the lead time for standard variable spring hangers?
Standard catalog units are typically shipped within 10 to 20 working days, depending on order size and current production load. Custom finishes, special travels, or stainless steel configurations may add a few additional days. Expedited delivery can be discussed at the time of order.
What documentation comes with an order?
Standard supply includes a packing list and product nameplates with spring number, load rating, and travel data. Material test reports (MTRs), spring load calibration records, and dimensional inspection reports can be provided on request. Third-party inspection by authorized bodies is also available for projects that require it.
Can you supply complete pipe support assemblies including pipe shoes and clamps?
Absolutely. We supply variable spring hangers as standalone units or as fully assembled support sets including pipe clamps, pipe shoe supports, turnbuckles, threaded rods, and structural connection hardware. Pre-insulated pipe support assemblies for cold or cryogenic service are also available as a single, ready-to-install package.
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