Rosette ring random tower packing — geometry, published parameters for the standard sizes, resin properties, operating characteristics and applications.
← Back to Teller Rosette RingThe Teller Rosette Ring is a random tower packing developed in the mid-1950s by A. J. Teller and named after him. It is known in the trade as the rosette ring, the flower ring or the Teller rosette, because of the way its body is arranged: rings of vanes are set radially around a central hub and held in an outer ring, so the packing reads as a flower or rosette when it is viewed along its axis.
The packing is a single open moulding with no flat plate and no minute openings. Its main published advantages are a high void space, a high liquid holdup in the gaps between the vane rings, a low pressure drop and a short height of a transfer unit, together with a high flooding point and a low unit weight. Those properties are the reason it holds a place in gas washing and purifying towers, where a long contact time between gas and liquid matters more than sheer surface area.
The parameters below are the figures published for this packing class in industry vendor literature. They describe the class rather than a guaranteed batch: published values differ between suppliers for the same nominal size, and the differences are set out where they occur. Every value we can confirm for your order is stated in the quotation, and any value we cannot confirm is given as on request rather than quoted.
The body is assembled from a number of vane rings arranged around a central hub, and the rings are held together by an outer ring. The outer ring of the moulded plastic version carries a finely toothed rim; the stainless steel version uses flat strip vanes set radially around a hub, with a crenellated or wavy rim instead. Viewed from the side the packing is a shallow flattened form, so it packs into a bed with its open faces angled to the gas path rather than aligned with it.
That geometry produces the operating behaviour the packing is chosen for:
The published ring counts per size differ between suppliers (for example 12 and 18 vane rings are both quoted for the Φ95 mm size), and the rim form differs between moulds and between the plastic and stainless steel versions. The mould supplied with an order can be confirmed with photographs and samples before shipment.
| Specification / mm × mm | Wall thickness / mm × mm | Bulk density / kg/m³ | Surface area / m²/m³ | Void space / % | Dry packing factor / m⁻¹ | Packing count / pcs per m³ |
|---|---|---|---|---|---|---|
| 25 × 9 | 1.5 × 2 | 90 | 350 | 92 | 300 | 180,000 |
| 51 × 19 | 3 × 3 | 63 | 219 | 92 | 250 | 52,000 |
| 73 × 28 | 3 × 4 | 61 | 150 | 93 | 150 | 12,800 |
| 95 × 37 | 3 × 6 | 58 | 112 | 95 | 130 | 6,500 |
| 145 × 48 | 3 × 8 | 55 | 70 | 95 | 80 | 1,860 |
Wall thickness in the dimension column applies to the moulded plastic version; stainless steel rings are fabricated from flat strip and are quoted on their diameter and vane arrangement instead. Surface area falls and void space rises as the nominal size increases, so the smaller sizes suit duties where surface area and contact area drive the design, and the larger sizes suit duties where pressure drop, plugging resistance and bed weight drive it.
Two parameters are quoted inconsistently across industry sources for this packing class, and we do not average them into a single figure that no source supports:
Surface area for the Φ25 mm size is also published as 195 m²/m³ by one source against 269 m²/m³ by the majority; the majority figure is used in the table and the alternative is recorded here. Column internals, packing support and vessel design should be checked against the bulk density and bed weight we confirm for your order.
The standard resin is polypropylene (PP), supplied in white or semi-transparent form. Reinforced polypropylene (RPP), polyethylene (PE), PVC, CPVC and PVDF are used where the medium or the temperature demands them, and stainless steel is available for duties where a plastic packing would not hold up. Tell us the composition, concentration and temperature of the stream and we will confirm the grade.
| Specification / mm × mm | Wall thickness / mm × mm | Bulk density / kg/m³ | Surface area / m²/m³ | Void space / % | Dry packing factor / m⁻¹ | Packing count / pcs per m³ |
|---|---|---|---|---|---|---|
| 25 × 9 | 1.5 × 2 | 90 | 350 | 92 | 300 | 180,000 |
| 51 × 19 | 3 × 3 | 63 | 219 | 92 | 250 | 52,000 |
| 73 × 28 | 3 × 4 | 61 | 150 | 93 | 150 | 12,800 |
| 95 × 37 | 3 × 6 | 58 | 112 | 95 | 130 | 6,500 |
| 145 × 48 | 3 × 8 | 55 | 70 | 95 | 80 | 1,860 |
Density and temperature limits are the resin properties published for plastic tower packings of this class; they describe the material itself, not a guarantee for a specific aggressive medium. Service temperature and service life for a given duty are confirmed with the order. We do not publish a nominal service life for this product.
The characteristics published for this packing class, in the vendors' own terms, are:
These are design-intent statements published by vendors of the packing class, not measured results for a particular column. Actual pressure drop, flooding behaviour and separation efficiency depend on the column diameter, the packing height, the liquid distributor, the gas and liquid loading and the medium itself. We do not publish efficiency or removal figures for this product — the correct approach is a design check against your duty, which we carry out on request.
Random tower packing of this class is used mainly for gas–liquid contact in packed columns, and for stripping and degassing duty in water and wastewater treatment:
To quote accurately we need the following, and price is always confirmed on request rather than published:
Send these details through the contact page and we will reply with the confirmed size, material, the packing parameters we can guarantee for the batch, and the commercial terms.
| Specification / mm × mm | Wall thickness / mm × mm | Bulk density / kg/m³ | Surface area / m²/m³ | Void space / % | Dry packing factor / m⁻¹ | Packing count / pcs per m³ |
|---|---|---|---|---|---|---|
| 25 × 9 | 1.5 × 2 | 90 | 350 | 92 | 300 | 180,000 |
| 51 × 19 | 3 × 3 | 63 | 219 | 92 | 250 | 52,000 |
| 73 × 28 | 3 × 4 | 61 | 150 | 93 | 150 | 12,800 |
| 95 × 37 | 3 × 6 | 58 | 112 | 95 | 130 | 6,500 |
| 145 × 48 | 3 × 8 | 55 | 70 | 95 | 80 | 1,860 |
Compiled from public vendor technical literature for the Teller Rosette Ring packing class (published size tables, resin property tables and product descriptions). Parameters are indicative of the class and are confirmed per order; where a value could not be verified it is stated as on request.
The plastic rosette ring was introduced by Teller A. J. in the United States in 1954 and is known in China as the Teller rosette ring. Its main characteristics are a high void fraction that resists plugging, high throughput and low resistance. Because the gaps between the packing hold a relatively high liquid holdup, the liquid remains in the tower longer, which increases the gas–liquid contact time and improves mass-transfer efficiency. The former Ministry of Metallurgical Industry first studied and introduced the plastic rosette ring from the American packing company as a packing specifically promoted for the metallurgical industry.
Structure: plastic strands are bent into spiral coils of a set diameter and then wound into a rosette form on the outer circumference, which increases the rigidity of the ring. Compared with Raschig rings, its pressure drop and height of a transfer unit are lower, its flooding point is higher, and its bulk density is very small.
Parameter values follow the reference table for plastic rosette ring packing (sizes 25 × 9 / 51 × 19 / 73 × 28 / 95 × 37 / 145 × 48 mm, with wall thickness, bulk density, surface area, void space, dry packing factor and packing count as listed). Confirm the final selection against the tower design and medium.