| Type: | Variable Spring Supports |
| Material: | Alloy 2205 Duplex/SAE 5160H |
| Design: | Operating Load up to 3,597 lbs./Operating Temperatures of -15-200°F |
| Testing: | Standard Load & Travel Tests |
Variable spring supports use helical coils to carry pipe loads while accommodating vertical movement. Because coil resistance changes with compression, the supported load varies through the operating range—hence the term “variable.” These supports are commonly used under rotating equipment (pumps, compressors) to reduce transmitted vibration and mitigate piping stresses. We manufacture multiple design configurations and offer extensive customization of materials, finishes, load ranges, travel, adjustment mechanisms, travel stops, and optional monitoring instrumentation.
For this project, we supplied custom variable spring supports for an FLNG platform in Singapore. The housings were fabricated from 2205 duplex stainless to address chloride-induced corrosion, and the coils were produced from SAE 5160H for improved corrosion and fatigue resistance. Installed heights ranged from 10-3/4″ to 12-1/16″, with operating loads up to 3,597 lb. Verification included load testing at -15°F and liquid penetrant inspection of all welds. The assemblies are rated for a service temperature range of -14°F to 200°F without reduction in load capacity.
We provide a full range of pipe supports and expansion joints for offshore service, including cryogenic systems on floating platforms for LNG transfer. Our engineering and field teams have supported subsea and topside inspections, including offshore dive assessments for emergency evaluations.
Our variable spring cans are designed for FLNG applications requiring predictable load behavior under thermal expansion, vertical displacement, and dynamic operating conditions. Manufacturing capabilities cover wide load and travel ranges in compact envelopes suited to topside modular layouts. We support material selection across carbon steel, stainless, duplex, Inconel, and other alloys to meet project-specific corrosion, weight, and compatibility requirements. All units undergo in-house load testing, hydrostatic proofing where applicable, and QA/QC in accordance with offshore and global project standards. Typical applications include supports for compressors, heat exchangers, risers, separation trains, and other critical process lines.
As FLNG deployment continues to grow at ~10% annually, PT&P and its subsidiaries are supporting associated infrastructure across renewable and clean-energy sectors. We have engineered and delivered products for solar, wind, water, geothermal, bioenergy, nuclear, hydrogen, and fuel-cell projects worldwide.
