l 500 compression of process gases - istcgroup.com ring vacuum pumps... · the seal liquid to form...

L_500 Liquid Ring Compressors

L_Series

L_500 Compression of process gases

Advantages at a glance:� Wide range of gases handled

� One-stage or two-stage compression

up to 2,600 scfm (4,400 m3/h)

� Pressure capability up to 175 psig (12 bar g)

� Low temperature compression

� High reliability

� Long life cycle

� High operational safety

� Robust, low maintenance

Main applications:� Chlorine compression

� Hydrogen compression

� Vinyl chloride

� Pulp and paper bleaching

process with ozone

� Recovery of hydrocarbons

e.g. flaregas or gasoline vapors

� Acetylene compression

… and many others

2 nash_elmo Industries L_500

In 2002 The Nash Engineering Company in the USA and elmo

vacuum technology GmbH, a Siemens subsidiary in Germany,

united to form nash_elmo Industries.

The L_500 liquid ring compressors were created specifically for the

chemical and petrochemical processing industries. They combine

the highest standard of reliability with a new level of ingenuity.

nash_elmo utilizes advanced design technologies to achieve

optimum capability.

The multidisciplinary design process relied on input from R&D,

manufacturing, marketing and most importantly our customers –

the chemical process engineers. The result: a revolutionary line

of compressors tough enough to be branded nash_elmo.

L_500 compressors at final inspection

nash_elmo Industries L_500 3

The right designnash_elmo designs and manufactures liquid ring compressors covering a

wide range of capacities up to 17,000 scfm (28,800 m3/h) and pressures

up to 175 psig (12 bar g). Our liquid ring design enables low temperature

gas compression, ideal for handling many process gases, including

explosive mixtures.

The right materialsMaterial choices include cast iron, ductile iron, steel and stainless steel,

with other materials available on special request, ensuring the right

metallurgy to handle most highly aggressive and corrosive vapors, as well.

Single, double, and gas lubricated shaft seals are also available.

The right protectionnash_elmo L_500 compressors are built to ISO 9001:2000 standards. Most

are also ATEX certified in accordance with guideline 94/9/EG, category 1 and 2.

atm 2 4 6 8 10 12 14

atm 40 80 120 160 175

28,800

100,000

10,000

1,000

160

m3/h

2,600

2,000

1,500

1,000

500

scfm

17,000

Discharge pressure bar g

Discharge pressure psig

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L_500 models

nash_elmo compressor capability chart

additional models


L_500 Performance at a glance

We design and develop solutions engineeredto your individual needs. Contact us for further details.

Features Benefits

Rugged design

Low temperature compression

Liquid ring

Many material options

Wide variety of seal options

ATEX certified

100% performance tested

Backed by 2 year warranty

and over 100 years of vacuum

and compressed gas experience

High reliability

Ability to handle explosive and

flammable gases

Low maintenance/vibration

Ability to handle corrosive gases

Meets process and safety needs

High safety standards

Troublefree startup and operation

Peace of mind

A

D

B

C

Model A B C D Suction anddischarge flange

connections2BK1 162 1270 380 510 250 DN80 mm

50 15 20 10 3-IN. FLG inches2BK1 222 1520 510 760 380 DN100 mm

60 20 30 15 4-IN. FLG. inches2BK1 282 1650 640 890 380 DN125 mm

65 25 35 15 5-IN. FLG. inches2BK1 332 2160 760 1020 510 DN150 mm

85 30 40 20 6-IN. FLG. inches


Model Suction capacity V Discharge pressure Power P m3/h scfm bar g psig kW hp

2BK1 162 300 – 900 175 – 530 4 60 50 – 100 65 – 1352BK1 222 800 – 1600 470 – 940 5 75 50 – 200 65 – 2702BK1 282 1250 – 2700 735 – 1590 4 60 80 – 250 105 – 3352BK1 332 2500 – 4000 1470 – 2355 4 60 120 – 350 160 – 470

Technical specifications: L_500 (models 2BK)

� Inlet gas path

� Discharge gas path

� Operating liquid



connections2BG1 150 1265 380 635 250 DN80 mm

50 15 25 10 3-IN. FLG. inches2BG1 151 1400 380 635 250 DN80 mm

55 15 25 10 3-IN. FLG inches2BG1 231 1900 760 890 380 DN125 mm

75 30 35 15 5-IN. FLG. inches2BG3 189 1270 760 635 250 DN80 mm

50 30 25 10 3-IN. FLG. inches

2BG1 150 200 – 400 120 – 235 10 145 50 – 150 65 – 2002BG1 151 400 – 800 235 – 470 12 175 75 – 250 100 – 3352BG1 231 900 – 1800 530 – 1060 9 130 300 – 500 400 – 6702BG3 189 450 – 750 265 – 440 15 220 50 – 250 65 – 335


Technical specifications: L_500 (models 2BG)

A

D

C

B

� Inlet gas path

� Inter stage path

� Discharge gas path

� Operating liquid


A

C

B

D

A

C

D

B

Technical specifications:

L_500 (models HP)


connectionsHP4 685 340 250 150 DN50 mm

27 13 10 6 2-IN. FLG. inchesHP6 1090 635 510 280 DN100 mm




60 55 40 20 10-IN. FLG. inches


HP4 255 – 350 150 – 205 5.5 80 40 – 75 55 – 100HP6 750 – 900 440 – 530 5.5 80 90 – 160 120 – 215HP7 950 – 1700 560 – 1000 5.5 80 180 – 300 240 – 400HP8 1850 – 2900 1090 – 1705 5.5 80 225 – 450 300 – 605HP9 2800 – 4250 1650 – 2500 7.6 110 600 – 1000 805 – 1340

Model HP9

Models HP4 thru HP8


Single-stageThe rotor 1 is positioned in the center of the elliptical casing 2. Centrifugal force causesthe seal liquid to form a ring against the inner surface of the casing 3. The liquid ismoving away from the center of the rotor in the inlet area, drawing the gas into the

rotor chambers 4. As these chambers rotate, the liquid is pushed back into the cham-bers, compressing the gas before exiting at the discharge port 5. The internal forces arebalanced due to the double-acting design, thereby reducing stress on the shaft, bearings

and mechanical seals for longer pump life.

Two-stageThe rotors 1 are positioned eccentrically in two cylindrical casings 2. Centrifugal forcecauses the seal liquid to form a ring 4 against the inner surface of the casing. The liquid is moving away from the center of the rotor in the inlet area, drawing the gas into the

rotor chambers 3. As these chambers rotate, the liquid is pushed back into the chambers,compressing the gas before exiting the first stage 5. The second stage functions in thesame manner, but is rotated 180°, thereby balancing the internal forces. This reduces

stress on the shaft, mechanical seals and bearings, thus extending pump life.

Functional principle of an L_500 compressor

1 Rotor

2 Casing

3 Liquid ring

4 Intake port

5 Discharge port

Inlet

Inlet

Discharge

Discharge

1 Rotor

2 Casing

3 Intake port

4 Liquid ring

5 Discharge port

2nd stage 2BG models 1st stage

2BK models HP models

The brown arrows show the balanced

forces in the compressor.


For 100 years, we have been assisting our customers in making the right vacuum

pump or compressor choice. As your engineering partners, we will provide you with

a nash_elmo performance analysis which includes a review of your particular process

requirements, and provides you with alternative means for meeting your process

needs. We will supply engineering data and application information, along with

short- and long-term cost comparisons.

Beginning today and throughout the life of every nash_elmo system, our engineers

are ready to support you to meet your vacuum and compressor process tasks.

Factory testedBefore any nash_elmo compressor is shipped out of our factory, it is performance tested

to meet the highest standards. We stand behind our products: every nash_elmo L_500

pump comes with a TWO-YEAR WARRANTY. Our new test bay gives us the capability to

simulate nearly all real operating conditions for liquid ring compressors.

A global service network with local support nash_elmo maintains service centers strategically located throughout the United States,

Europe and Asia. Each center is staffed by specialists with considerable application

know-how. They have original factory replacement parts in stock and are equipped

with the tools, fixtures and special machinery necessary for pump and compressor

repair. The nash_elmo commitment to service extends to its regional distribution cen-

ters and retailers. Stocked with inventories of factory parts and purchased components,

our distribution centers can deliver pumps and parts anywhere, any time. We are also

able to service vacuum pumps and compressors of other makes and models.

A new company, a unified visionnash_elmo is more than a new company. It is the fusion of global leaders in the

development, design and application of vacuum and compressor system technology.

Our combined resources give us the ability to provide the best solution to any industrial

need virtually anywhere in the world. We are a company with an extensive range of

products and services and an unmatched reputation for reliability. Because nash_elmo

is a company with the resources to turn the most ambitious vision into reality and to

put that vision to work for you.

Commitment, reliability and worldwide support

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European HeadquartersNuremberg, Germany

Katzwanger Straße 150 D-90461 NürnbergTel.: +49 911 1454 0

Order-No: VNE:B-PB013-A2-AMPrinted in GermanyDispo 278012238/021 16.0 / 04-2004© 2004 All rights reserved

nash_elmo Industries

[email protected]

Corporate HeadquartersTrumbull, CT USA

9 Trefoil DriveTrumbull, CT 06611-1330Tel.: +1 800 553 6274

Other nash_elmo product lines

L_Series: Liquid Ring Pumps

D_Series: Dry Pumps

Robust technology for the highest demands and varied applications

Machines in the L_Series distinguish themselves through low opera-

ting temperatures and are suitable for handling splash water, steam

and condensates. They were developed for the toughest applications

and can safely and reliably extract or compress even explosive gas/

steam mixtures (ATEX-certified). Selection of a suitable operating

liquid enables the L_Series vacuum pumps and compressors to be

optimally integrated into processes. Thanks to their low operating

costs and extensive performance range up to 37,000 m3/h

(22,000 cfm), they excel in any application.

Proven, reliable and extremely quiet

Whether vacuum pumps, compressors or systems for conveying air,

gases or air/gas mixtures, the extensive range of products in the

G_Series meets the widest range of requirements. Thanks to their

variable voltage motors, many are usable anywhere in the world

without the need for conversion. In addition to their compact con-

struction, full UL/CSA certification and innovative design, G_Series

pumps and compressors offer a comprehensive power range up to

2,500 m3/h (1,470 cfm), maximum power density and a wide selec-

tion of accessories, including frequency converters.

Simple design for varied applications

The vane pumps in our V_Series are known for their robust design,

easy handling and long service life. Furnished with an extremely

sturdy metal coating as well as installation- and service-friendly

plug & play functionality, these high performance machines are

extremely quiet in operation, and can meet even the most chal-

lenging industrial demands while covering an impressive perfor-

mance range up to 4,000m3/h (2,350 cfm) and 10 bar g (145 psig).

High reliability with low operating costs

The dry-running vacuum pumps in our D_Series are explosion-proof

and were specially developed for production processes involving

sensitive materials. Throughout the entire process, they operate

condensation-free – and therefore corrosion-free – because there

are no operating fluids to mix with the process gases. As a result,

discharge gases can simply be collected and/or returned to the process.

There are no waste products. In addition, all pumps in the D_Series

are highly efficient and provide a constant suction capacity over an

extremely wide range of pressures with a performance range up to

to 2,200 m3/h (1,300 cfm).

V_Series: Vane Pumps

G_Series: Gas Ring Blowers

l 500 compression of process gases - istcgroup.com ring vacuum pumps... · the seal liquid to form...

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