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Explore SpecificationsPall rings represent a quantum evolutionary step from the classical Raschig ring geometry. By stamping inward curved webs or fingers within the cylindrical outer wall, modern Pall rings optimize mass transfer contact by opening the internal volume of the cylinder to vapor-liquid shearing while dramatically reducing hydraulic pressure drop.
By punching radial openings through the side walls, Pall rings unlock up to 30% greater throughput capacity and a 40% lower pressure drop compared to classical continuous-wall Raschig rings. This prevents internal gas throttling and suppresses localized channel flooding even under elevated liquid mass velocity (L > 50 m³/m²·h).
The internal tongue structures act as persistent droplet nucleation and liquid film renewal points. Rather than liquid pooling or channeling down external tower perimeter walls, liquid is continuously redirected across the vapor stream, maximizing effective interfacial surface area (a_e) per unit volume.
Our Pingxiang fabrication facilities produce Pall rings across comprehensive material standards: Stainless Steel (304, 304L, 316, 316L, 321, 904L), Carbon Steel, Monel, Hastelloy, alongside polymer grades (Virgin Polypropylene, Reinforced PP, PVDF, PTFE, HDPE, CPVC) and acid-proof industrial glazed ceramic.
| Nominal Size (D × H mm) | Material Classification | Standard Wall Thickness (mm) | Geometric Surface Area (m²/m³) | Void Fraction (ε %) | Packing Factor (Fp 1/m) | Bulk Density (kg/m³) |
|---|---|---|---|---|---|---|
| 16 × 16 (5/8") | SS304 / SS316L | 0.3 – 0.5 | 340 | 93.0% | 230 | 450 |
| 25 × 25 (1") | SS304 / SS316L | 0.5 – 0.8 | 215 | 94.5% | 160 | 380 |
| 38 × 38 (1.5") | SS304 / SS316L | 0.6 – 1.0 | 130 | 96.0% | 100 | 320 |
| 50 × 50 (2") | SS304 / SS316L | 0.8 – 1.2 | 110 | 96.5% | 70 | 250 |
| 25 × 25 (1") | Virgin Polypropylene (PP) | 1.0 – 1.2 | 205 | 90.0% | 175 | 85 |
| 50 × 50 (2") | PVDF / PTFE (Halogen-Resistant) | 1.5 – 2.0 | 102 | 92.0% | 80 | 145 |
| 50 × 50 (2") | Industrial Acid Ceramic | 4.0 – 6.0 | 95 | 78.0% | 115 | 610 |
Operating since 2003 in Pingxiang, Jiangxi Province — universally recognized as China's capital for chemical packing and industrial ceramics — Pingxiang Zhongtai Environmental Chemical Packing Co., Ltd. brings unprecedented scale, material pricing stability, and engineering rigor to global engineering, procurement, and construction (EPC) programs.
Situated directly adjacent to top-tier domestic rolling mills, alloy strip processors, and ultra-pure clay deposits, our stamping and forming facilities eliminate multiple distribution intermediaries. We guarantee mill test certificates (MTC 3.1) with verifiable metallurgy on every coil of SS316L, Duplex 2205, or pure polymer resin.
Equipped with computerized high-speed multi-stage dies and proprietary progressive stamping lines, our plants convert tons of raw strip into precision-cut, burr-free Pall rings per day. Strict dimensional tolerances are preserved across wall thickness, tongue deflection angle, and circular symmetry.
Unplanned plant shutdowns, turnarounds (TAR), and emergency debottlenecking operations demand quick execution. Our production capacities enable the loading of 40-foot high-cube containers of certified packing within 5 to 7 days, fully packaged in weatherproof bulk jumbo bags or reinforced export crates.
Global procurement teams in North America, Europe, the Middle East, and Southeast Asia face complex regulatory challenges regarding material traceability, environmental compliance, and pressure vessel design specifications. Zhongtai ensures end-to-end alignment.
Every shipment of metal or polymer Pall rings conforms to ASME Section VIII fabrication expectations and China HG/T 21556.3 / HG/T 3986 industrial standards. Third-party testing via SGS, TÜV, or BV for chemical PMI composition and crush strength is routine.
To eliminate customs delays and accelerate site QA acceptance, our export division provides certified Mill Test Reports (MTR EN 10204 3.1), Certificates of Origin (Form E, CO, FTA), Fumigation Certificates, and hazardous-area packaging compliance dossiers with batch barcodes.
Our in-house chemical engineers assist engineering contractors with HETP (Height Equivalent to a Theoretical Plate) calculations, sizing liquid redistributors, bed support plates, and hold-down grids to assure your tower hydraulics perform as modeled in Aspen Plus or ChemCAD simulations.
Mass transfer packing demands have expanded beyond traditional oil refining into critical green transition sectors, including carbon capture, green hydrogen deoxygenation, and industrial flue gas desulfurization.
Optimized 38mm & 50mm stainless Pall rings provide high contact efficiency in amine absorption columns (MEA/MDEA), maximizing CO₂ stripping while preventing foaming and excessive solvent degradation under varying thermal profiles.
Ceramic Pall rings and partition rings deployed in high-temperature, oleum-laden environments resist strong acid attack while offering the structural integrity required to support massive liquid holdup weights without crushing.
Engineered Polypropylene (PP) and PVDF Pall rings resist chlorination and alkaline conditions during air stripping of ammonia, volatile hydrocarbons, and hydrogen sulfide from industrial wastewater effluent streams.
Precision 304L/316L Pall rings perform dependably in cryogenic methane wash columns and air fractionation systems, ensuring zero embrittlement issues and low static pressure drop down to -196°C.
In-depth responses curated by our senior process engineering department to solve specification, metallurgy, and tower installation challenges.
While structured packings offer lower pressure drop per theoretical stage, Pall rings remain the superior engineering choice in applications prone to solid deposition, fouling, or polymerization (such as slurry columns or raw coker fractionators). Pall rings provide high operational turndown tolerance and are considerably less expensive and easier to dump-install or replace during rapid turnaround cycles.
At Zhongtai, our metal Pall rings strictly observe international manufacturing tolerances of ±0.03 mm to ±0.05 mm on wall thickness, conforming to HG/T 21556.3. Maintaining precise sheet gauge ensures specified bed weight limits are preserved without overloading support grids or compromising mechanical crush strength.
Standard Polypropylene (PP) provides outstanding resistance up to 90°C in non-oxidizing solutions. When continuous operation exceeds 100°C, or when aggressive media such as wet chlorine, nitric acid, concentrated halogens, or ozone are encountered, PVDF (stable to 140°C) or fluoropolymer PTFE must be specified to prevent environmental stress cracking and embrittlement.
To avoid crushing or flattening of internal tongues under freight loads, metal Pall rings are packed in reinforced, double-walled woven jumbo bags (typically 1 m³ per bulk bag) equipped with cross-corner lifting loops, or corrugated cartons strapped to solid, heat-treated ISPM-15 export pallets. For delicate thin-walled alloys, rigid steel or plastic drums are provided upon request.
Yes. A mass transfer bed is only as efficient as its primary liquid distributor. Zhongtai designs and manufactures complete tower internals packages, including multi-tier trough or spray liquid distributors, vapor redistributors, bed limiter meshes, structured support grids, and chevron mist eliminators engineered specifically to match your vessel diameter and process fluid flow.
Thanks to our automated progressive stamping lines and large inventory of prime stainless steel and polymer coils, standard orders between 20 m³ and 100 m³ ship from Pingxiang to major export ports (Shanghai, Ningbo, Shenzhen) within 7 to 10 working days. Full sea-freight booking and customs clearance support are managed by our dedicated global trade department.
Complete your mass transfer column and bed configuration with factory-direct support balls, hydraulic liquid distributors, ceramic honeycomb media, and proppants.
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