What are Pall Rings?
Pall rings are the most basic, most common type of tower packing. This ring is a versatile and very affordable option for distillation, absorption and stripping processes in various industries. They are used in high-volume and high-temperature processes also. The interior and exterior surfaces of the pall ring efficiently distribute fluids and gases. They are very popular in the industry for their good capacity at the low-pressure drop. Pall rings can be made from metal, plastic, or ceramic materials, all of which have excellent corrosion resistance for use in corrosive environments.
Features
- 20–40% packing volume saving
- 20% higher mass transfer efficiency
- 50% pressure drop reduction under the same handling capacity
- 50% increased handling capacity than Raschig ring under the same pressure drop
Material
- Stainless Steel 316/L, 304/L, 410, Inconel, Monel, Hastelloy, etc.
- Plastic - PP, RPP, CPVC, PVDF and PVC
- Ceramic
Applications :
- Suitable for high-temperature processes
- Higher loading capacity and throughput
- Low-pressure drop
- Higher mass transfer efficiency
- Good fouling resistance
- Plastic Pall Ring: Medium and low temperature distillation, absorption and washing towers in chemical, petroleum, chlor-alkali, coal gas and environmental protection industries
- Ceramic Pall Ring: Contacting packing for carbon dioxide degassing tower, acid fog purifying tower, ozone contact reaction tower and other reaction towers
Metal Pall Rings
Metal Pall Rings are a type of random packing used in chemical processing towers, typically for distillation, absorption, and stripping processes. They are made of metal, often stainless steel or other corrosion-resistant alloys, and feature a unique design with cylindrical walls and inward-bent protrusions. These protrusions or "fingers" provide increased surface area and promote efficient gas-liquid contact, enhancing mass transfer and separation processes within the tower. Metal Pall Rings are favored for their high mechanical strength, resistance to fouling, and longevity in harsh operating conditions. They are widely used in various industries such as petrochemical, pharmaceutical, and environmental engineering.
Features of Metal Pall Rings
- High loading capacity and throughput
- Effective liquid and gas separation capabilities with high efficiency
- Resistance to corrosion and rust
- Low pressure drop
- Temperature resistance
- High mechanical capacity with a reduced likelihood of breakage
- Different sizes and specialized dimensions can be tailored to specific requirements
| Technical Parameters of Metal Pall Ring | ||||||
|---|---|---|---|---|---|---|
| Item | Ring Diameter (mm) |
Diameter × Height × Thickness (mm) |
Surface Area (m2/m3) |
Void Fraction | Bulk Density (kg/m3 |
Packing Factor (m-1) |
| APM-01 |
16 |
16 × 16 × 0.4 |
239 |
92.8% |
143000 |
299 |
| APM-02 |
25 |
25 × 25 × 0.6 |
219 |
93.4% |
55900 |
269 |
| APM-03 |
38 |
38 × 38 × 0.8 |
129 |
94.4% |
13000 |
153 |
| APM-04 |
50 |
50 × 50 × 1.0 |
112 |
94.9% |
6500 |
131 |
| APM-05 |
76 |
76 × 76 × 1.2 |
72 |
95.1% |
1830 |
84 |
Plastic Pall Rings
Plastic pall rings are increasingly favored in gas and liquid separator applications. They boast exceptional chemical resistance, temperature stability, and mechanical strength. Variants include Polypropylene (PP), Polyethylene (PE), RPP, PVDF, PVC, and CPVC pall rings. Like metal Pall Rings, they feature a cylindrical shape with inward-bent protrusions or "fingers" that provide a large surface area for gas-liquid contact. Plastic Pall Rings offer benefits such as corrosion resistance, lightweight design, and cost-effectiveness compared to metal alternatives. They are commonly utilized in industries where corrosion resistance and durability are crucial, including wastewater treatment, air pollution control, and chemical processing.
Features of Plastic Pall Rings
- High mechanical strength
- Exceptional operational versatility
- High separation efficiency
- High mechanical strength
- Diverse internal configurations adaptable to various applications
| Technical Parameters of Plastic Pall Ring | ||||||
|---|---|---|---|---|---|---|
| Item | Ring Diameter (mm) |
Diameter × Height × Thickness (mm) |
Surface Area (m2/m3) |
Void Fraction | Bulk Density (kg/m3) |
Packing Factor (m-1) |
| APP-01 |
16 |
16 × 16 × 1.1 |
188 |
91% |
112000 |
249 |
| APP-02 |
25 |
25 × 25 × 1.2 |
175 |
90% |
53500 |
239 |
| APP-03 |
38 |
38 × 38 × 1.4 |
115 |
89% |
15800 |
220 |
| APP-04 |
50 |
50 × 50 × 1.5 |
112 |
90% |
6500 |
154 |
| APP-05 |
76 |
76 × 76 × 2.6 |
73 |
92% |
1930 |
94 |
Ceramic Pall Rings
Ceramic pall rings represent a classical form of random packing, derived from the Raschig ring design. Typically, they feature two layers of windows along the cylindrical wall, with each layer containing five inward-bending ligules, akin to metallic and plastic pall rings. However, the arrangement and number of ligules may vary depending on the height and diameter specifications. Typically, around 30% of the cylinder wall's total area is dedicated to openings. This configuration facilitates unhindered flow of vapor and liquid through the windows, maximizing utilization of the ring's inner surface to enhance vapor and liquid distribution. Consequently, this design can elevate separation efficiency.
Features of Ceramic Pall Rings
- High chemical stability
- High mechanical strength
- Resistance to acids, alkalis, salts, and diverse organic solvents
- Outstanding heat endurance
- Sizes and window configurations are customizable to suit varying applications and specifications
| Technical Parameters of Ceramic Pall Ring | ||||||
|---|---|---|---|---|---|---|
| Item | Diameter × Height × Thickness (mm) |
Surface Area (m2/m3) |
Void Fraction | Bulk Quantity (pcs/m3 |
Bulk Density (kg/m3) |
Packing Factor (m-1) |
| APC-01 |
25 × 25 × 3 |
238 |
73% |
54000 |
520 |
565 |
| APC-02 |
38 × 38 × 4 |
197 |
75% |
13400 |
570 |
365 |
| APC-03 |
50 × 50 × 5 |
154 |
78% |
6800 |
550 |
252 |
| APC-04 |
80 × 80 × 8 |
116 |
80% |
1950 |
520 |
146 |