OIL-FREE HIGH-PRESSURE PISTON COMPRESSOR DM (440 bar/37 kW)

OIL-FREE HIGH-PRESSURE PISTON COMPRESSOR DM (440 bar/37 kW)

PEAK PERFORMANCE COMPRESSION SYSTEMSAtlas Copco manufactures high-end premium

products engineered by a world-class center of

excellence. Our commitment to quality is exemplified

by compliance with ISO 9001, ISO 14001 and OHAS

18001 certifications. We have a century of experience

in high-pressure technology and have installed

thousands of compressors worldwide for various

industrial gas and vehicle refueling applications. Our

DM high-pressure oil-free compressor range will

meet your needs for peak performance and optimal

efficiency.

HIGH-PRESSURE, HIGH RELIABILITY, AND NO OIL CARRY-OVERThe DM compressor range utilizes Atlas Copco’s

revolutionary oil-free high-pressure technology.

It prevents oil from contaminating the gas. And it

eliminates concerns about oil disposal contaminating

the environment. The hermetically sealed compressor-

motor unit with magnetic coupling ensures no gas

losses to the atmosphere. The unique vertical design

of these 2-5 stage compressors is especially designed

for diverse gas compression applications where

space is at a premium.

DM HIGH-PRESSURE OIL-FREE COMPRESSORSDM compressors are oil-free, air-cooled, high-

pressure piston machines incorporating inovative

scotch yoke technology in a vertical design.

Completely gas-tight, they are perfectly adapted to

applications such as natural gas vehicle refueling

stations, natural gas grid boosting, hydrogen

and other industrial gas compression for various

end uses.

Oil-freeWith its unique scotch yoke design converting rotating

movements into linear movements, the DM compressor does

not require lube oil, hence will not contaminate the

compressed gas with oil carry-over. It also does not require

oil disposal processes, or power consumption for crankcase

heaters in cold weather.

Gas-tightThe hermetically sealed pressurized crankcase means that

the DM compressor is absolutely gas-tight. No gas will leak

to the atmosphere and no gas contamination from the

outside is possible. The suction process starts directly from

the pressurized crankcase with a range from atmospheric

pressure up to 39 bar(a) inlet pressure.

Easy maintenanceThanks to the magnetic coupling, the compressor block can

be easily dismounted and replaced on site in less than a half

a day. The dismounted compressor block will then be

refurbished in the factory to guarantee the shortest

downtime and maximum availability.

COMPRESSED GAS WHEN YOU NEED ITThe DM compressor gives you high-pressure gas with high availability, outstanding cost-efficiency, and

low environmental impact. Whatever your process, natural gas, biomethane, nitrogen, hydrogen, air or

CO2 will be compressed up to 350 bar (450 bar for hydrogen) with no oil contamination, no gas losses

and the highest safety and availability.

Scotch Yoke

degrees ATDC

degrees ATDCCrank and slider

1.5

0.0004

0.0003

0.0002

0.0001

0

-0.0001

-0.0002

-0.0003

-0.0004

-0.0005

1

0.5

0

-0.5

-1

-1.5

0

0

90

90

180

180

270

270

360

360

Scotch yoke principle for balanced forcesThe choice of a scotch yoke as reciprocating motion allows the conversion of the

rotational motion of the prime drive into a linear motion. The reciprocating parts are

directly coupled to a sliding yoke which allows a perfectly balanced centric drive in

an extremely compact format.

Displacement

Acceleration

Hermetically sealed pressurized crankcase compression block in oil-free executionThe hermetically sealed oil-free compressor-motor unit with magnetic coupling ensures no gas losses

to the atmosphere and prevents gas contamination from the direct environment. This allows Zone

declassification from Zone 1 to Zone 2 in case of explosive gases.

The revolutionary oil-free high-pressure technology ensures no oil contamination of the gas, and

eliminates the risk of oil disposal contaminating the environment.

In addition to the economic and ecological advantages, the magnetic coupling allows a compression

unit to be changed in only a few hours, which leads to maximum compressor availability.

1

2

4

5

6

7

SAFE FOR GAS APPLICATIONS The DM compressors are safe for any gas application and fully comply with

ATEX and PED regulations.

Highly efficient: 2 to 5 compression stagesDM compressors are available with up to 5 compression stages to ensure low

compression ratios, reduced heat generation, and less wear.

4

Anti-vibration padsDM compressors are assembled on a vertical frame,

isolated from their support by vibration dampening

elements. No special foundations are required.

5

Cooling air fanDirectly coupled to the main drive to ensure a constant air flow through the

whole unit.

1

Gas coolerAfter each compression stage the gas is cooled by fins

around the gas pipes.

2

Magnetic coupling The shaft is completely integrated in a hermetic housing with magnets ensuring

rotation. This eliminates risk of gas leakage, prevents wear, and eases

dismantling.

3

3

7

8

9

10

11

12

Electric motor drive• The drive is coupled at the bottom with a cooling air fan and at

the top with a magnetic coupling.

• Available for Zone 2, and optionally for Zone 1.

6

Hermetically sealed pressurized crankcase• Trunk piston technology enables the cylinders to fit on the

crankcase.

• Suction process starts directly from the pressurized crankcase

with up to 39 bar(a).

• No need for distance pieces, gaskets or stuffing boxes.

7

Pressure relief valvesA set of relief valves and gauges on inter-stage and discharge

side for optimized safety.

8

Separator after last compression stageInterconnection gas pipes in stainless steel.

9

Relief valve collectorEach individual stage is collected back to suction.

10

Vertical frameAll elements are assembled on a steel base frame. The vertical

design allows an extremely small footprint of only 0.7 m2.

11

Cooling air channelEnsures optimal cooling air flow through the complete

compressor.

12

OPTIMAL CONTROL OF YOUR COMPRESSION SYSTEMThe SEKA II control unit is a fail-safe electronic board specifically developed to control compressors and

their system components. It allows fail-safe solutions to be set up quickly and with minimal maintenance

requirements. It eliminates the need for complex circuitry for monitoring systems (e.g. for suction pressure

or final output stage temperature). Interactive communication allows operators and service personnel to

identify and rectify problems quickly and effectively. This increases system availability and significantly

reduces maintenance and servicing costs.

SEKA II benefits• Tested by the German Technical Inspection Agency (TÜV) for safety

circuits up to AK3.

• One-stop solution – including the main control component.

• Independency from PLC manufacturers and their products increases

your investment protection.

• Interactive communication helps faults to be rectified quickly.

• Remote monitoring allows service and operating personnel to

provide improved support.

• Straightforward monitoring (teleservice) also available for operators.

• Low maintenance and service costs.

CUSTOMER-FRIENDLY DESIGN

Easy installationWith its extremely compact design and the smallest footprint in its

category, the DM compressor can be installed in any corner of your

premises. The compressor is mounted on anti-vibration pads. The

small footprint means that your system can easily be expanded in

the future with additional units without taking up significant extra

space.

Reduced maintenanceThe DM compressor benefits from a unique and advanced

maintenance concept for very short downtimes. After being

dismounted from the compression unit at site, the compression

block will be replaced at site and the used one refurbished in our

factory. Exchanging the block takes less than half a day, after which

the new period of operation starts with a renewed compressor

block. This periodically executed process leads to smooth and

troublefree operation.

STANDARD SCOPE AND FEATURES

Standard scope

2-5 stage oil-free compression block

Frame mounted in vertical arrangement

Hermetically sealed crankcase

Electric motor (Ex Zone 2 classification) with magnetic coupling

Working pressure up to 301 bar(a)

Stainless tubing and inter-stage air cooler

Set of gauges and safety valves on inter-stage and discharge side

Pressure transmitter at discharge side

Temperature transmitter at discharge side

Separator after final stage

Direct-driven cooling air fan

Anti-vibration pads

CE conformity

PED/ATEX conformity

Standard options

Cooling air channel for corner installation

Cooling air channel for free-standing installation

Electric cubicle with micro-electronic control

Engineered models

H2 execution

Zone 1 classification

60 Hz models

440 bar(g) execution

The DM compressor is ideal for CNG stations. We can provide a complete package with one or two compressors.

TECHNICAL SPECIFICATIONSTechnical data

Flow rate diagram

Suction pressure Up to 40 bar(a)

Working pressure Up to 451 bar(a)

Flow rate Up to 210 Nm3/h

Motor power 30 kW (37 kW)

Size 900 x 740 x 1700 mm (L x W x H)

Weight ca. 800 kg

Gases Natural gas, bio-methane, hydrogen, noble gases

Volume Flow [Nm3/h] (0 °C; 1.013 bar(a))

Suction Pressure [bar(a)]

0

80

160

240

0 1 1.5 2.5 5.0 7.0 14.0 26.0 40.0

COMMITTED TO SUSTAINABLE PRODUCTIVITYWe stand by our responsibilities towards our customers, towards the environment and the

people around us. We make performance stand the test of time. This is what we call –

Sustainable Productivity.

www.atlascopco.com

2935

060

2 10

– P

rin

ted

in B

elg

ium

. Su

bje

ct t

o a

lter

atio

n w

ith

ou

t p

rio

r n

oti

ce. N

ever

use

co

mp

ress

ed a

ir a

s b

reat

hin

g a

ir w

ith

ou

t p

rio

r p

uri

fica

tio

n in

acc

ord

ance

wit

h lo

cal l

egis

lati

on

an

d s

tan

dar

ds.