Insulation Flat Expansion Spring
Quick Details:
- Item: Flat Expansion Spring
- Material: Stainless Steel 304 or 316
- Wire Diameter: 3 mm
- Size (H × ID × OD × L): 10 mm × 22 mm × 28 mm × 100 mm
- Suitable for: 3/4″ (19 mm) banding
- Packing: 200 pcs/box, 0.1 kg/pc
- Application: Small-to-medium diameter insulated pipes, tanks & vessels
- Delivery: 20–30 days (FOB)
- Payment: TT, LC
The Ecoin Insulation Flat Expansion Spring is a compact stainless steel spring designed to secure insulation jacketing on small-to-medium diameter insulated pipes, tanks, and vessels. Unlike tall compression spring boxes, it wraps horizontally around 3/4″ (19 mm) banding in a low-profile clip, making it ideal for tighter installation spaces.
Made from 3 mm SUS 304 or SUS 316 stainless steel wire, each flat expansion spring for pipe insulation accommodates thermal expansion and contraction without loosening the banding, ensuring the insulation jacket remains securely clamped throughout the operating temperature cycle.
At 100 mm length with a 28 mm outer diameter, the Ecoin Flat Expansion Spring is dimensionally equivalent to the GLT Products Flat Expansion Spring #3 — providing a cost-effective, factory-direct replacement for insulation contractors worldwide.
Flat Expansion Spring Specifications
| Parameter | Value |
|---|---|
| Item | Flat Expansion Spring |
| Material | SUS 304 / SUS 316 |
| Wire Dia. | 3 mm |
| Height (H) | 10 mm |
| Inner Dia. (ID) | 22 mm |
| Outer Dia. (OD) | 28 mm |
| Length (L) | 100 mm (~4″) |
| Banding Width | 3/4″ (19 mm) |
| Unit Weight | 0.1 kg/pc |
| Packing | 200 pcs/box |
| Delivery | 20–30 days (FOB) |
| Payment | TT, LC |
Chemical Composition
| Grade | C | Cr | Ni | Mo |
|---|---|---|---|---|
| SUS 316 | ≤0.08 | 16–18 | 10–14 | 2–3 |
| SUS 304 | ≤0.08 | 18–20 | 8.0–10.5 | — |
- Compact Low-Profile — Only 10 mm tall; fits tight spaces where full compression spring boxes cannot.
- Constant Lateral Tension — Maintains banding pressure through full thermal cycles; no re-tightening needed.
- SUS 304 & 316 Options — SUS 316 for marine, coastal, and chemical service with chloride exposure.
- High Packing Density — 200 pcs/box at 0.1 kg/pc; easy bulk transport and jobsite handling.
- GLT #3 Compatible — Direct replacement for GLT Products Flat Expansion Spring #3 (4″ / 100 mm).
- No Special Tools — Works with standard 3/4″ banding tools and wing-seal buckles.
- Corrosion Resistant — Stainless steel withstands outdoor exposure, moisture, and steam throughout service life.
- Small-bore pipe insulation — NPS 1″–10″ insulated with calcium silicate, mineral wool, or foam glass.
- Tanks & vessels — Small-to-medium diameter process vessels, heat exchangers, and storage tanks.
- Refrigeration pipework — Cold insulation where banding must stay tight despite thermal contraction.
- HVAC ductwork — Securing insulation on round and rectangular commercial ducts.
- Marine & offshore — Ship engine rooms and offshore platforms (specify SUS 316).
- Power generation — Turbine bypass piping and feedwater heaters with cyclic thermal loading.
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