Metal VSP Ring vs Metal Intalox Saddle: Which Random Packing Should You Select?

Metal VSP Ring and Metal Intalox Saddle cannot be ranked by one universal family-level rule. DAIER's catalog data show that their relative positions change with packing size.

At approximately 25 mm, Metal VSP Ring provides almost the same specific surface area as Metal Intalox Saddle while offering:

• higher void fraction;
• lower dry bulk density;
• lower dry packing factor;
• far fewer elements per cubic meter.

Around 38–40 mm, VSP retains a similar hydraulic advantage, although Intalox Saddle provides more geometric area.

But at 50 mm, the ranking changes:

• VSP has slightly more surface area;
• Intalox has higher void fraction;
• Intalox is lighter;
• Intalox has the lower dry packing factor.

Near the 76 mm physical-size class, that reversal becomes even stronger.

Therefore:

Metal VSP Ring is not universally the more hydraulically open option, and Metal Intalox Saddle is not universally the higher-area option. Exact size-specific data determine the answer.

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1. Direct Answer

Evaluate Metal VSP Ring more strongly when:

• 25–40 mm size classes are suitable;
• lower packed-bed weight is important at those smaller sizes;
• high void fraction is required;
• a relatively low dry packing factor is preferred;
• an existing VSP bed should remain like-for-like.

Evaluate Metal Intalox Saddle more strongly when:

• developed saddle geometry is preferred;
• higher area is important around the 38–40 mm class;
• 50 mm or larger physical sizes are being considered;
• lower bed weight becomes important in the larger-size range;
• the larger-size catalog hydraulic position is more suitable.

The critical rule is:

Check the exact size before choosing the family.

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2. Direct / Near-Size Comparison

The VSP values are also confirmed in DAIER's Metal VSP Ring product data sheet.

The 38 vs 40 mm and 76 vs 70-class rows are:

near-size comparisons, not exact nominal-size matches.

The nominal 70 mm Intalox model has a listed principal dimension of approximately:

76.5 mm

so it is physically close to the 76 mm VSP model.

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3. 25 mm Is Surprisingly Close in Surface Area

At 25 mm:

Metal VSP Ring

196 m²/m³.

Metal Intalox Saddle

199 m²/m³.

Difference:

only 3 m²/m³.

That is roughly:

1.5%.

So from a purely geometric surface-area perspective:

the two 25 mm beds are nearly identical.

This is much closer than many engineers might expect from two different packing families.

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4. But VSP Has Higher Void Fraction at 25 mm

VSP

97.3%.

Intalox

96.6%.

Difference:

0.7 percentage point.

The difference is not huge, but it favors VSP.

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5. VSP Is Much Lighter at 25 mm

Bulk density:

VSP

209 kg/m³.

Intalox

266 kg/m³.

VSP is approximately:

21% lighter per cubic meter.

For a 20 m³ packed bed:

VSP

4,180 kg.

Intalox

5,320 kg.

Difference:

approximately 1.14 tonnes.

This is a meaningful mechanical advantage.

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6. VSP Uses Far Fewer Elements

Packing population:

VSP

52,500 pcs/m³.

Intalox

127,180 pcs/m³.

VSP uses approximately:

59% fewer elements.

Yet it still provides virtually the same specific surface area.

That is an important product-level insight:

pieces per cubic meter cannot be used as a surface-area metric.

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7. Packing Factor Is Also Slightly Lower for VSP

At 25 mm:

VSP

212.2 m⁻¹.

Intalox

221.0 m⁻¹.

Difference:

8.8 m⁻¹

or about:

4%.

So the 25 mm VSP position is particularly strong because it combines:

• almost identical area;
• higher voidage;
• lower bed weight;
• slightly lower packing factor.

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8. That Does Not Make VSP Universally Better

The 25 mm comparison is favorable to VSP on several catalog parameters.

But that does not mean:

VSP is always the better packing family.

As size increases:

the ranking changes.

This is the central lesson of the article.

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9. 38 vs 40 mm Still Favors VSP Hydraulically

The next comparison is:

38 mm VSP

versus:

40 mm-class Intalox Saddle.

The Intalox model's listed principal dimension is approximately:

35.4 mm.

So this is best treated as a near-size comparison.

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10. Intalox Has More Surface Area Here

VSP 38

134 m²/m³.

Intalox 40 class

151 m²/m³.

Intalox provides approximately:

13% more geometric surface area.

So at this size, the saddle geometry begins to show a clearer area advantage.

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11. Void Fraction Is Almost Identical

VSP

97.5%.

Intalox

97.4%.

Difference:

only 0.1 percentage point.

By void fraction alone:

these two beds are essentially adjacent.

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12. Bulk Density Is Also Very Close

VSP

198 kg/m³.

Intalox

203 kg/m³.

Difference:

5 kg/m³

or roughly:

2.5%.

So around this size class, bed weight is not a major separator.

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13. Packing Population Is Completely Different

VSP

15,500 pcs/m³.

Intalox

51,180 pcs/m³.

The Intalox bed contains more than:

3.3 times as many elements.

Yet its surface area is only about:

13% higher.

This is another powerful example showing:

packing count is not proportional to total surface area.

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14. VSP Has the Lower Dry Packing Factor

VSP

144.9 m⁻¹.

Intalox

163.2 m⁻¹.

VSP is approximately:

11% lower.

So around the 38–40 mm size range:

Intalox trades a modest amount of hydraulic-factor position for additional surface area.

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15. 50 mm Is Where the Ranking Reverses

Now compare the exact 50 mm models.

Metal VSP Ring

• 102 m²/m³;
• 97.6% void;
• 192 kg/m³;
• 6,850 pcs/m³;
• 110.1 m⁻¹.

Metal Intalox Saddle

• 97 m²/m³;
• 97.9% void;
• 169 kg/m³;
• 15,550 pcs/m³;
• 103.9 m⁻¹. 

This is the key turning point.

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16. VSP Now Has Slightly More Surface Area

VSP

102 m²/m³.

Intalox

97 m²/m³.

VSP provides approximately:

5% more area.

That is a small advantage.

But nearly every other catalog parameter now favors Intalox.

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17. Intalox Has Higher Void Fraction

VSP

97.6%.

Intalox

97.9%.

Difference:

0.3 percentage point.

So the family ranking in voidage has reversed.

At 25 mm:

VSP was more void.

At 50 mm:

Intalox is more void.

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18. Intalox Is Also Lighter

Bulk density:

VSP

192 kg/m³.

Intalox

169 kg/m³.

Intalox is approximately:

12% lighter.

For a 30 m³ bed:

VSP

5,760 kg.

Intalox

5,070 kg.

Difference:

approximately 690 kg.

Again, the ranking has reversed from the 25 mm case.

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19. Intalox Also Has the Lower Packing Factor

VSP

110.1 m⁻¹.

Intalox

103.9 m⁻¹.

Difference:

6.2 m⁻¹

or approximately:

6% lower for Intalox.

So at exactly 50 mm:

Intalox has higher voidage, lower weight and lower dry packing factor.

VSP's main catalog advantage is only:

slightly higher surface area.

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20. 50 mm Is Therefore a Genuine Selection Boundary

At small sizes:

VSP has the stronger hydraulic / weight position.

At 50 mm:

Intalox takes that position.

This means any rule such as:

“VSP Ring is a lower-pressure-drop alternative to saddle packing”

is too simplistic.

The correct answer is:

sometimes—depending on size.

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21. Packing Population Still Does Not Explain the Result

At 50 mm:

VSP

6,850 pcs/m³.

Intalox

15,550 pcs/m³.

Intalox has more than:

twice as many elements.

Yet it is:

• lighter per cubic meter;
• more void;
• lower in dry packing factor.

Therefore:

more elements do not automatically mean heavier or less open.

Individual element geometry and material distribution matter.

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22. Metal Thickness Adds Another Layer

Representative construction:

VSP 50

approximately:

0.5 mm.

Intalox 50

approximately:

0.5 mm.

So the 50 mm difference is not simply explained by one product using thinner metal.

Despite similar nominal thickness:

their kg/m³ and physical bed properties differ significantly.

This reinforces:

geometry—not thickness alone—controls the packed bed.

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23. The Large Physical-Size Comparison Strengthens the Reversal

Now compare:

VSP Ring

76 mm.

Intalox Saddle

70 mm class, but approximately:

76.5 mm principal dimension.

This is a useful physical near-match.

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24. VSP Still Has Slightly More Surface Area

VSP

67 m²/m³.

Intalox

61 m²/m³.

VSP provides approximately:

10% more geometric area.

So its small surface-area advantage continues.

But everything else diverges strongly in favor of the saddle.

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25. Intalox Has Much Higher Void Fraction

VSP

97.4%.

Intalox

98.7%.

Difference:

1.3 percentage points.

For already high-voidage metal packings, this is a meaningful catalog difference.

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26. The Bed-Weight Difference Becomes Very Large

Bulk density:

VSP

206 kg/m³.

Intalox

106 kg/m³.

The Intalox bed is approximately:

49% lighter.

For a 30 m³ bed:

VSP

6,180 kg.

Intalox

3,180 kg.

Difference:

approximately 3 tonnes of dry packing.

This is a major mechanical and freight distinction.

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27. Why Is 76 mm VSP So Heavy?

The representative VSP thickness increases to approximately:

0.8 mm

at 76 mm.

The large Intalox model remains approximately:

0.5 mm

in the referenced series.

This is one important reason why large-size VSP bulk density rises so strongly.

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28. Packing Factor Also Favors Intalox

VSP

72.9 m⁻¹.

Intalox

63.5 m⁻¹.

Intalox is approximately:

13% lower.

So near the 76 mm physical class, Intalox offers:

• higher void fraction;
• approximately half the dry bed weight;
• lower dry packing factor;

while sacrificing only around:

9% of VSP's geometric surface area.

This is a very different conclusion from the 25 mm comparison.

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29. The Full Ranking Clearly Reverses

At 25 mm

VSP:

• virtually equal area;
• more void;
• lighter;
• lower factor.

Around 38–40 mm

VSP:

• less area;
• essentially equal voidage;
• slightly lighter;
• lower factor.

At 50 mm

VSP:

• slightly more area;

but Intalox:

• more void;
• lighter;
• lower factor.

Near 76 mm physical size

VSP:

• slightly more area;

but Intalox:

• much more void;
• dramatically lighter;
• lower factor.

That is a genuine:

size-dependent family reversal.

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30. Surface-Area Ranking Also Changes

At 25 mm:

199 vs 196

slightly favors Intalox.

At ~38–40 mm:

151 vs 134

favors Intalox.

At 50 mm:

102 vs 97

now favors VSP.

Near 76 mm:

67 vs 61

still favors VSP.

So even the statement:

“Intalox always has more surface area”

is false.

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31. Hydraulic Ranking Changes Too

Dry packing factor:

25 mm

VSP lower.

38–40 mm

VSP lower.

50 mm

Intalox lower.

~76 mm

Intalox lower.

Therefore:

neither family owns the lower packing-factor position across the full range.

This is exactly the kind of size-specific engineering distinction a useful product database should preserve.

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32. Bed-Weight Ranking Changes Even More Dramatically

Bulk density:

25 mm

VSP much lighter.

38–40 mm

almost equal.

50 mm

Intalox lighter.

~76 mm

Intalox dramatically lighter.

This progression is:

VSP advantage → convergence → Intalox advantage.

That is a clear and useful selection map.

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33. Why Family-Level Marketing Claims Are Dangerous

Statements such as:

“VSP provides lower pressure drop than saddle packing.”

or:

“Intalox provides more surface area than ring packing.”

may be directionally true in some size ranges.

But DAIER's exact catalog data show that:

the ranking can reverse.

A technically serious selection page should therefore answer:

Which size?

before saying:

Which family?

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34. Which Is Better for 25 mm Service?

Based on the catalog parameters alone, VSP has a very strong preliminary position because:

• area is essentially the same;
• voidage is higher;
• bulk density is lower;
• packing factor is lower.

If:

• VSP geometry;
• process wetting behavior;
• project requirements

are appropriate, it deserves strong consideration.

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35. Which Is Better Around 38–40 mm?

The decision becomes more balanced.

Choose Intalox more readily if:

the additional surface area is valuable.

Choose VSP more readily if:

lower packing factor and fewer elements are more important.

Bulk density and voidage are already very close.

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36. Which Is Better at 50 mm?

The catalog balance shifts toward Intalox.

It provides:

• higher voidage;
• lower bulk density;
• lower dry packing factor;

while giving up only:

approximately 5% surface area.

That makes 50 mm Intalox a particularly strong candidate when both:

• hydraulics;
• bed weight

matter.

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37. Which Is Better at Large Physical Size?

Near the ~76 mm class:

Intalox has the stronger overall catalog balance

unless the slightly higher VSP surface area is specifically valuable.

The dry weight difference is especially substantial:

206 vs 106 kg/m³.

That can dominate:

• retrofit support review;
• freight;
• installation handling.

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38. Which Is Better for Fouling?

There is no universal winner.

VSP Ring and Intalox Saddle use different:

• openings;
• surface geometry;
• element shapes.

Fouling depends on:

• solids;
• crystals;
• sticky material;
• process polymerization;
• liquid distribution.

Do not select from:

• void fraction alone.

A higher catalog void fraction does not prove:

better fouling resistance.

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39. Existing VSP Should Not Be Replaced with Intalox as a Routine Substitution

At 50 mm the data may make Intalox look attractive.

But converting VSP → Intalox changes:

• element geometry;
• packing population;
• wetting pattern.

It should therefore be treated as:

a retrofit.

The same applies in the opposite direction.

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40. Same Packed Height Does Not Guarantee Equivalent Performance

If changing between these families:

do not automatically preserve bed height and assume identical separation or absorption performance.

Review:

• process duty;
• gas/vapor rate;
• liquid load;
• tower ID;
• allowable pressure drop;
• available bed height.

Catalog similarity is not the same as identical wet operating performance.

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41. Alloy Selection Is Separate from Geometry

Both families may be manufactured in different metals.

Actual alloy suitability depends on:

• chemical species;
• concentration;
• temperature;
• chlorides;
• corrosion mechanism.

Do not allow a geometry comparison to override:

material compatibility.

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42. Supplier Quotations Must Normalize Thickness

This is especially important for VSP.

Representative VSP thicknesses increase:

• 25 mm — 0.3 mm;
• 38 mm — 0.4 mm;
• 50 mm — 0.5 mm;
• 76 mm — 0.8 mm. 

Metal Intalox representative thickness also varies with size.

Two quotes cannot be meaningfully compared on:

USD/m³

before checking:

• alloy;
• dimensions;
• thickness;
• kg/m³.

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Decision Table

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Common Selection Mistakes

Assuming VSP Always Has Lower Packing Factor

False at 50 mm and the large physical size class in this dataset.

Assuming Intalox Always Has More Surface Area

False from 50 mm upward in these comparisons.

Assuming VSP Is Always Lighter

False at 50 mm and especially near 76 mm.

Assuming More Pieces Means More Surface Area

25 mm VSP provides nearly the same area with far fewer pieces.

Ignoring Metal Thickness

Large VSP thickness rises substantially.

Comparing 38 vs 40 mm as Exact Same Size

It is a near-size comparison.

Comparing 76 VSP with “70 mm Intalox” Only by the label

The Intalox element's listed principal dimension is approximately 76.5 mm.

Treating Dry Packing Factor as Actual Pressure Drop

Operating conditions remain necessary.

Switching Families During Routine Maintenance

That is a retrofit.

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Frequently Asked Questions

Which has more surface area at 25 mm?

They are almost equal:

• VSP — 196 m²/m³;
• Intalox — 199 m²/m³.

Which is lighter at 25 mm?

VSP Ring:

209 vs 266 kg/m³.

Which has lower packing factor at 25 mm?

VSP:

212.2 vs 221.0 m⁻¹.

What happens around 38–40 mm?

Intalox provides more surface area:

151 vs 134 m²/m³

while VSP provides the lower packing factor:

144.9 vs 163.2 m⁻¹.

What happens at 50 mm?

The ranking reverses.

VSP has slightly higher area:

102 vs 97 m²/m³

but Intalox has:

• higher voidage;
• lower bulk density;
• lower dry packing factor.

What is the 50 mm bulk-density comparison?

VSP:

192 kg/m³.

Intalox:

169 kg/m³.

Which has lower packing factor at 50 mm?

Intalox:

103.9 vs 110.1 m⁻¹.

Why compare 76 mm VSP with 70 mm-class Intalox?

Because the latter's listed physical dimension is approximately:

76.5 mm

making it a useful physical near-size comparison.

What happens at that large size?

Intalox is:

• more void;
• much lighter;
• lower in dry packing factor;

while VSP retains slightly more surface area.

Can one directly replace the other?

Do not treat them as like-for-like. Any family conversion should be reviewed as a retrofit.

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Selection Takeaway

Metal VSP Ring vs Metal Intalox Saddle is a clear example of a packing-family ranking that reverses with size.

At 25 mm:

VSP → 196 m²/m³ / 97.3% void / 209 kg/m³ / 212.2 m⁻¹

versus:

Intalox → 199 m²/m³ / 96.6% void / 266 kg/m³ / 221.0 m⁻¹.

Here VSP retains almost identical area while providing:

• more voidage;
• less bed weight;
• lower dry packing factor.

Around 38–40 mm:

VSP → 134 m²/m³ / 97.5% void / 198 kg/m³ / 144.9 m⁻¹

versus:

Intalox → 151 m²/m³ / 97.4% void / 203 kg/m³ / 163.2 m⁻¹.

Intalox gains area, while VSP keeps the lower-factor position.

At 50 mm:

VSP → 102 m²/m³ / 97.6% void / 192 kg/m³ / 110.1 m⁻¹

versus:

Intalox → 97 m²/m³ / 97.9% void / 169 kg/m³ / 103.9 m⁻¹.

Now the ranking reverses:

Intalox is more void, lighter and lower in dry packing factor.

Near the ~76 mm physical class:

VSP → 67 m²/m³ / 97.4% void / 206 kg/m³ / 72.9 m⁻¹

versus:

Intalox → 61 m²/m³ / 98.7% void / 106 kg/m³ / 63.5 m⁻¹.

The reversal becomes even stronger.

Therefore the key engineering principle is:

Never assign a fixed family-level ranking to Metal VSP Ring and Metal Intalox Saddle. Their relative surface area, packed-bed weight, voidage and hydraulic packing-factor position change materially with size.

The correct selection sequence is:

Tower Diameter → Physical Size Class → Exact Geometry → Required Contacting Area → Hydraulic Constraint → Packed-Bed Weight → Alloy / Thickness → Fouling → Compare Exact VSP / Intalox Data → Internals Review