Pall Ring
Packing

The Pall ring is an improvement on the Raschig ring: two rows of rectangular windows are punched through the cylinder wall, one side of each cut wall stays attached while the other bends inward to form an inward tongue, and the side edges of the tongues meet near the centre of the ring. The open wall greatly improves the utilisation of the space and surface inside the ring, with low gas resistance and even liquid distribution. Compared with a Raschig ring, gas throughput can rise by more than 50%, mass-transfer efficiency improves by about 30%, capacity increases by over 50% and pressure drop falls by 50%. It is one of the most widely used packings.

Request a Quote Technical Details

Random packingType

PP · stainlessMaterial

2 rowsPunched windows

On requestSize & price

White polypropylene Pall ring packing in several specifications, photographed on a reflective dark background

Type

Random tower packing

Wall form

Two rows of staggered punched windows

Material

Polypropylene (PP) · stainless steel

Nominal size

Multiple specifications — confirmed on request

Price

On request

Why this media

An open wall,
a renewed film

The Pall ring is an evolution of the plain Raschig ring: instead of closing the wall of the cylinder, it cuts windows through it and bends the displaced material inward. Both sides of the design change as a result: the free area open to the gas, and the wetted surface open to the liquid.

Open wall, more free area

Two rows of staggered windows are punched through the cylinder wall, so the ring is a largely open frame rather than a closed tube. Gas rising through the bed finds a larger free area and less resistance than it would in a plain ring of the same nominal diameter.

Inward tongues renew the film

The material displaced from every window is bent inward to form a tongue. The tongues break up the descending liquid and spread it back over the wall, so the film is renewed instead of channelling down the same path, and they add contact area inside the ring.

Random bed, easy to handle

The rings are dumped into the column in bulk, so there is no orientation work and no stacking pattern to maintain. The bed can be unloaded, washed and re-loaded for repacking work, and the open wall has no fine openings in which solids can lodge.

Specifications

Technical parameters

Type	Size d × H × δ / mm	Bulk density / kg/m³	Surface area / m²/m³	Void space / %	Dry packing factor / m⁻¹
Metal Pall ring — 1Cr18Ni9Ti · 0Cr18Ni9 · 304 · aluminium alloy
16 × 16 × 0.8	216	240	94	300	143,000
25 × 25 × 0.8	427	219	94	250	56,900
38 × 38 × 0.8	365	130	94	150	13,000
50 × 50 × 1.0	390	112	95	130	6,500
76 × 76 × 1.2	313	70	95	80	1,860
Plastic Pall ring — PP · R-PP · CPVC · PVDF · PFA
16 × 16 × 0.8	141	287	91	250	112,000
25 × 25 × 0.8	100	194	89	294	63,500
38 × 38 × 0.8	98	155	89	220	15,700
50 × 50 × 1.0	87	112	89	146	7,000
76 × 76 × 1.2	71	73	90	90	1,930
Ceramic Pall ring
25 × 25 × 3	680	260	78	—	50,000
50 × 50 × 5	430	135	74	—	6,500
80 × 80 × 8	610	110	70	—	1,900

Every figure that depends on the size, the material or the batch is stated as on request rather than copied from a table that describes the packing class in general. We confirm the values we can guarantee for your order in the quotation, and we do not publish price, efficiency or removal numbers for this product.

Applications

Where it fits

Absorption & scrubbing towersFlue-gas desulphurisationStripping & degassing towersWater deaeration & CO₂ removalOdour control unitsDistillation & liquid–liquid extractionCooling towersRepacking of existing columnsPetrochemical, chemical & pharmaceutical plantsWaste-gas treatment

Product gallery

See the packing up close

Off-white polypropylene Pall rings, three pieces, on a blue background

White Pall ring, single piece, showing the punched tongue windows on a dark background

Semi-transparent polypropylene Pall rings with inward conical tongues, two pieces on a black background

Grey Pall rings, two pieces on a blue background, one upright and one on its side

Stainless steel Pall rings in seven different sizes on a white background

Six stainless steel Pall rings arranged in two rows on a light background

Two polished stainless steel Pall rings, one large and one small, side by side

Group of white polypropylene Pall rings on a dark textured background

Single semi-transparent white polypropylene Pall ring photographed on a work surface

Loose pile of semi-transparent polypropylene Pall rings on a black background

Row of five semi-transparent polypropylene Pall rings on a black background

White polypropylene Pall ring packing in four different sizes on a reflective black background

Tell us your column and your medium

Send the column diameter, the packing height, the gas and liquid loads and the medium — we will confirm the right size, the material and the export packaging.

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Pall Ring
Packing