®

Tower Packing
Structured & Random
I nnova tion | R el i ab i l i t y | D yna m i sm

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 125 Years of History

Fabio Baretti Paleari

CEO

Baretti was founded in 1890 by my to USA, almost 50 years back, to acquire

grandfather Giovanni Baretti. license for tray’ technologies creating new
Since then, Baretti has seen several opportunities. We still strive for innovative
transformations and gone through technologies, products and applications.
evolutions to meet the required market Nowadays, our products are present in
needs and the socio-economic changes. almost every country having hydrocarbon
Among all, I would like to mention the processing industries but we still follow
most vital and successful ones. few basic but very important principles:
During the fifties, inspired by Mr. Enrico
Mattei, the President of ENI, we entered • Be humble and be curious: every day
into the business of the equipment we can learn something new
for the newly world-wide and growing • Act in good faith: leave up to our
hydrocarbon industry. Then, we added conscience with honest words and
the construction and installation of actions
Marine Loading Arms and special facilities • Struggle for Quality: Neither mistakes
for the berthing of oil super tankers. nor delays are allowed
• Meet Customer Satisfaction: Give the
In eighties, we started to design and best product at the best price
to construct special high-precision • Practice Safety: life is the most
mechanical manufacturing machines. important gift that God has given us
Even, we manufactured components
for nuclear plants, as per that period, In the course of all these years, I am very
the most advanced certified quality proud of the results we have achieved
management system. and I personally present my gratitude to
all our Customers and Employees.
Today, our business is focused upon However, every day we are working for
technologies for the hydrocarbon a better future where we see Baretti
processing industry and separation growing into a more profitable company
components. But what we have learned and expand its reach in every corner of
and experienced in the course of the the world with the wish of adding value
past 125 years still permeates the to Customers and Civil-Society while
company. We learned the importance of keeping in harmony with the global
our Customers and earned their respect. environment.
We value the importance of passionate
Employees.
We still have the same enthusiastic
entrepreneurial spirit, which took me

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TABLE OF CONTENTS
Large Diameter Vacuum Towers ....................... 14
Tower Packing
Baretti Structured Packing .................................... 4

Baretti Structured Packing Technical Data ......... 6

Baretti Structured Packing High Performance.... 9

Baretti Grid B-37 .................................................. 11

Baretti Random Packing...................................... 12

Tower Internals .................................................... 14

Large Diameter Vacuum Towers ....................... 15

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BARETTI STRUCTURED PACKING
Since mid 80’ Baretti has successfully designed and installed structured packing and
relevant internals in fractionation columns

The main refinery experiences have been in:

• Crude Atmospheric and Vacuum Towers:
• Overflash / wash section
• Pump arounds sections
• Fractionations sections
• Strippers
• FCC Main Fractionators
• Hydrocracking Main Fractionators
• Coker Main Fractionators
• Amine Absorbers and Regenerators
• Sour Water Strippers
Other areas of experience are:
• TEG Contactors
• Quench Towers
• LAB Alkylation
• Fibers
• Fatty Acids
• Deodorizers
• Air Cooling
• Scrubbers

Characteristics of BARETTI’s structured packing is the unique treatment of the packing

surface.
This treatment is the result of numerous tests performed by our engineers in the aim to
obtain a surface with two main characteristics:
• Maximum surface area
• Maximum surface wettability

These two characteristics are fundamental to enhance the packing performances:

• The surface area determines the packing efficiency expressed in Theortical Stages per
meter (TS/m) or Hight Equivalent to Theoretical Plate (HETP)
• Higher wettability improves the spreading of liquid on all available packing surface
therefore the packing efficiency is maximized (reduced HETP).
• Superlative mechanical resistance due to a fully welded assembly.

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BARETTI STRUCTURED PACKING
Standard Types

Specific Crimp Average Crimp Average

Type Surface Angle Efficiency Angle Efficiency
(test/mix) (test/mix)
(m²/m³) TS/m TS/m
B-64 64 45° 1.0 60° 0.6
B-100 100 45° 1.2 60° 0.8
B-125 125 45° 1.5 60° 0.9
B-150 150 45° 2.0 60° 1.3
B-170 170 45° 2.2 60° 1.4
B-200 200 45° 2.5 60° 1.6
B-250 250 45° 3.0 60° 2.0
B-300 300 45° 3.5 60° 2.5
B-350 350 45° 4.0 60° 3.0
B-400 400 45° 4.5 60° 3.6
B-500 500 45° 4.8 60° 3.8
B-750 700 45° 5.8 NA

Baretti manufactures structured packing in various thicknesses and materials.

Standard Material Type

Type Thick. AISI 410S
mm AISI 304/304L
B-64 0.25 AISI 316/316L
B-100 0.15 AISI 317
B-125 0.15 AISI 321
B-150 0.15 Alloy20
B-170 0.10 Duplex
B-200 0.10 Hastelloy
B-250 0.10 Monel
B-300 0.10 Titanium
B-350 0.10
B-400 0.10
B-500 0.10
B-750 0.10

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BARETTI STRUCTURED PACKING TECHNICAL DATA

Structured Packing B - 125

Structured Packing B - 125

Structured Packing B - 200 Structured Packing B - 200

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BARETTI STRUCTURED PACKING TECHNICAL DATA

Structured Packing B - 250

Structured Packing B - 250

Structured Packing B - 350

Structured Packing B - 350

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BARETTI STRUCTURED PACKING TECHNICAL DATA

Structured Packing B - 64.45

Structured Packing B - 64.60

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BARETTI STRUCTURED PACKING HIGH PERFORMANCE
BARETTI has developed a proprietary high performance structured packing
since 2007:
• The conventional structured packing, installed with each layer rotated in respect to the previous
one, suffers a premature flooding where the two layers touch each other.
• This phenomena is caused by the sudden change in direction of the flow who creates a
localized pressure drop.
• The end of each diagonal channel of the BARETTI High Performance Structured Packing is
formed to avoid, almost totally, the sudden change in direction of the flow.
• This result in a vey significant improvement. The Baretti High Performance Structured Packing
has gained more than 30% in capacity, lower pressure drop at same efficency of conventional
structured packing at similar condition.
• The BARETTI High Performance structured packing is an excellent opportunity for increasing
further the capacity of towers already packed with conventional Structured Packing

Structured Packing B - 250 - HC

Structured Packing B - 250 - HC

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BARETTI STRUCTURED PACKING HIGH PERFORMANCE

Structured Packing B - 350 - HC

Structured Packing B - 350 - HC

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BARETTI GRID B-37
Baretti B-37 grid is a fixed geometry packing with high open area, low pressure drop and low
susceptibility to fouling, coking and erosion.
The primary use is in the wash zone of heavy hydrocarbons fractionators with very severe
operating conditions.

The panels are available in several stainless steel grades with thickness of 1,50 and 2,00 mm.
A bed of B-37 grids consists of several layers of self­-supporting panels. The shape and lay-out of
the panels result in a flow pattern of the vapor upward enhancing the removal of heavy liquid
and solid entrainment. The lower layer of the bed is clamped to the supporting ring and beams.
The other layers rest on top of one another, each one rotated of 45 degrees to the one below.
Split beds of B-37 on the bottom and structured packing on the top are used where both high
entrainment removal and some fractionation are required.
An extra resistance to upset is obtained with J bolts fastening together the top three layers of
grids. No other hold-down device is needed.

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BARETTI RANDOM PACKING

Baretti design and manufactures the most advanced random packing types:
Pall type rings

Pall Rings have replaced the Raschig Rings

since long time due to their excellent results
in many applications like:
Absorbers, Regenerators, Strippers and
Scrubbers.

Baretti Metal Random Packing

(BMRP)

BRMP replaced both Pall and Rashig Ring

due to enhanced performances in terms of
capacity, pressure drop and efficency.

Random packing has been used since early 40’s as an alternative to tower trays.
The main improvements achieved with modern packing are:
• Contrary to trays there is no need to split the column area in active area (bubbling zone) and
the downcomer one. The vapour and liquid occupy the required section determined by the
volumes and pressure drop.
• The capacity of the traditional packing is close to the one of the trays at atmospheric and
high pressures. In vacuum systems the random packing is preferred for its lower pressure
drop.
• As mentioned above the main characteristic of the random packing is a much lower pressure
drop as compared to trays.
• The efficiency is quite constant across the full operating range.
Some possible problems that can be encountered with packings are:
• A packed bed requires always an optimum liquid and gas distribution, the trays are much
less sensitive at this point
• In fouling services the packing could plug and could be difficult to clear. If packing needs to
be replaced it implies a substantial cost
• In case the tower shell needs inspection, the only possibility for inspection is to remove the
packing
• In case of corrosive service the minor thickness of ring with respect to trays can be a problem

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BARETTI RANDOM PACKING
X3000 crankshaft ID: 213213

BMRP data chart

Dimensions # 25 #40 #50 #60 #70

Specific Surface m²/m³ 230 150 110 82 60

Number Pieces/ m³ 130000 46000 14600 10500 4900

Packing Factor 440 250 195 170 130

Pressure Drop BRMP # 25

Pressure Drop BRMP # 50

Baretti can supply metal, plastic, ceramic and carbon rings as requested by the project.
Other types of rings are available on request

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CRANKSHAFTS
TOWER INTERNALS FOR COLUMNS WITH PACKING

The performances of the packed beds

strongly depends on:

Typical Packed Column Arrangement

Liquid distribution
• Baretti B - 186 liquid distributor can be used
For low liquid rates (< 30 - 50 m³/hr/m²)
• The maldistributoion ( measured drip point
to drip point)is less than 3% up to 8 meters
column diameter

Gas distribution
• Baretti manufactored and design many type
of Gas/Vapor distibutors
• The selection of appropriate distribution
depends on capacity and services (full gas,
mix, ore flashing

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LARGE DIAMETER VACUUM TOWERS

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 Your Worldwide Partner

Baretti Mefe S.r.l.

SS415 Ponte Adda
26016 Spino d’Adda (CR) Italy
Ph + 39 0373 96701
Fax + 39 0373 967031

baretti@baretti.it - www.baretti.it

Baretti Sarl
Ph: + 33 442 346097
robert.catrano@baretti.fr - www.baretti.fr

Baretti Do Brasil Imp. e Exp. Ltda

Ph.: +55 (11) 3213-8568
baretti@baretti.com.br - www.baretti.com.br

Baretti Manufacturing & Services Ltd

Ph. + 33 442 346097
robert.catrano@baretti.fr - www.baretti.it

baretti@baretti.it
www.baretti.it

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FRI Member

© 2018 Baretti

20181902 TowerPacking