Our solutions
Industrial Tools & Solutions
Solutions
Products
Industrial Tools & Solutions
Power Equipment
Solutions
Products
Power Equipment
Energy Storage Systems
Compressors
Solutions
Products
Compressors
Products and solutions
Solutions

Oil vapor filtration for air compressors

Contact our expert

Maximum oil vapor removal

Measuring air purity

Easy maintenance

Energy savings

Oil vapor filtration for air compressors

If oil vapours enter the compressed air stream, they can damage air-powered equipment and contaminate end products, which can increase the operating costs of businesses significantly.

That is why Atlas Copco has developed a series of top-quality air filters that can protect your operation and your investments from oil vapor. The filters of the QDT and QD+ series can help your equipment last longer and ensure that your end products meet even the most stringent quality standards. 

Know your air quality requirements

If you know that a filter from the QDT or QD+ series is the ideal solution for you, then you can find detailed information on the specifications below.

However, if you are uncertain which filter to use and only know that you have to protect your system from oil vapor, then you first have to find out your air quality requirements. For some applications, oil vapor in the compressed air stream does not pose a problem, for example inflating tires. In cleanroom environments, on the other hand, these vapors must be filtered out before they contaminate sensitive end products.

Knowing your air quality requirements and which standards to comply with will help you select the right air filter, which could lower your investment costs and ensure that you get the most out of your compressed air system. If you are not sure which ISO standard applies to your operation or which type of contaminant you have to protect your system from, you can contact Atlas Copco or consult the tables below.

QD+ series

The macro-structured activated carbon of Atlas Copco’s QD+ series will reduce the residual oil content through adsorption to less than 0.003 mg/m³. In addition, it offers a low pressure drop that remains constant during the lifetime of the filter.

QD+ filters not only ensure a maximum oil vapor removal but also minimal dust release. They minimize operating costs and are extremely reliable thanks to stainless-steel cores, epoxy-sealed caps and a filter housing with anti-corrosive coating.

The filters of the QD+ series are also easy to maintain, which lowers your operating costs further. The push-in element and drain connection were designed for effortless replacement. The service indicator shows (preventive) maintenance alerts.

Performance

 

QD+

Contaminant

Oil vapor

Filtration technology

Macro-structured activated carbon

Test method

ISO 8573-5:2001

Maximum oil carry-over (mg/m³)*

0.003*

ISO class 8573-1

[2:-:1]

Average dry pressure drop (mbar)

75

Element service

After 2,000 operating hours or 1 year

For flanged filters: after 1,000 operating hours or 1 year

 

Precede with

Water separation

UD+ or DD+/PD+

Dryer

QDT series

These filters consist of a high-efficiency activated carbon tower that removes oil vapor, hydrocarbons and odors from your compressed air supply. Using adsorption, the activated carbon layers will reduce the residual oil content to lower than 0.003 mg/m³.

Thanks to an optimal internal flow path, the filters of the QDT series also offer a low pressure drop that stays minimal throughout the filter’s lifetime. Their robust design and optimal filter material also make the QDT series highly reliable.

Performance

  QDT
Contaminant Oil vapor
Test method ISO 8573-5:2001, ISO 12500-2:2007
Maximum oil carry-over (mg/m³)* 0.003
Average dry pressure drop (mbar)

125 (QDT 20-310)

72 (QDT 425-1800) 

Element service

After 4,000 operating hours or 1 year (up to QDT 310)

After 8,000 operating hours or 1 year (from QDT 425)

Precede with

Water separation UD+ or DD+/PD+

Dryer

Certification

QDT series - ISO 8573-5:2001

Check out the brochure for more information on the QD+ and QDT series.

For filtering out oil vapor (as well as hydrocarbons and odors), Atlas Copco also offers the high-pressure H series of filters and its silicone-free SFA series.

Cutting-edge filtration technology

Atlas Copco’s dedicated filtration team is always looking for ways to give you a competitive edge. The new filter generation features several innovations that make your filtration system more efficient and its operation easier. Here are just three examples. 


Service indicator

To ensure constant air quality, the QD+ series features a service indicator for an easy check of the filter’s running hours, differential pressure, and the maintenance status. It can even send a remote alert.

inPASS™ bypass

The QD+ series comes with the revolutionary built-in bypass that allows you to service your filter without disrupting the air flow. To you that means big investment savings by eliminating the need install an expensive external piping bypass, lower operating and energy costs as well as reduced maintenance times. 


The ideal filtration technology

The QD+ series uses the macro-structured activated carbon technology, which provides a larger surface structure than typical carbon filters. Thanks to its supreme adsorption capacity, it delivers a steady performance over a longer period.

QD+ series

Technical specification

Filter size with or without inPASS™

Nominal capacity

Reference pressure

Maximum pressure

Connections

l/s

cfm

bar(e)

psig

bar(e)

psig

G

NPT

7+

7

15

7

102

16

232

G 1/2

NPT 1/2

15+

15

32

7

102

16

232

G 1/2

NPT 1/2

25+

25

53

7

102

16

232

G 1/2

NPT 1/2

45+

45

95

7

102

16

232

G 3/4

NPT 3/4

75+

75

159

7

102

16

232

G1

NPT 1

110+

110

233

7

102

16

232

G 1 1/2

NPT 1 1/2

145+

145

307

7

102

16

232

G 1 1/2

NPT 1 1/2

180+

180

381

7

102

16

232

G 1 1/2

NPT 1 1/2

240+

240

509

7

102

16

232

G 2

NPT 2

300+

300

636

7

102

16

232

G 2

NPT 2

G 2 1/2

NPT 2 1/2

With inPASS™

380+

380

805

7

102

16

232

G 3

NPT 3

425+

425

901

7

102

16

232

G 3

NPT 3

510+

630

1081

7

102

16

232

G 3

NPT 3

Without inPASS™

360+

360

763

7

102

16

232

G 2 1/2

NPT 2 1/2

430+

430

911

7

102

16

232

G 3

NPT 3

525+

525

1112

7

102

16

232

G 3

NPT 3

630+

630

1335

7

102

16

232

G 3

NPT 3

Flanged

Flanged connection

550+F/630+F

550

1165

7

102

16

232

DN 80

850+F/970+F

850

1801

7

102

16

232

DN 100

850+T

850

1801

7

102

16

232

DN 100

1100+F/1260+F

1100

2331

7

102

16

232

DN 100

1100+T

1100

2331

7

102

16

232

DN 100

1400+F/1600+F

1400

2967

7

102

16

232

DN 150

1800+F/2200+F

1800

3814

7

102

16

232

DN 150

2200+F/2400+F

2200

4662

7

102

16

232

DN 150

3000+F/3600+F

3000

6357

7

102

16

232

DN 200

4000+F

4000

8476

7

102

16

232

DN 200

5000+F

5000

10595

7

102

16

232

DN 200

6000+F

6000

12714

7

102

16

232

DN 250

7000+F

7000

14833

7

102

16

232

DN 250

8000+F

8000

16952

7

102

16

232

DN 300

QD+ series - Correction factors

Working pressure  in bar(g)

1

2

3

4

5

6

7

8

10

12

14

16

Correction factor

0.38

0.53

0.65

0.75

0.83

0.92

1

1.06

1.20

1.31

1.41

1.50

QDT series

Technical specification

Filter size

Nominal capacity

Connections G or NPT

l/s

cfm

in

20

20

42

1/2

45

45

95

1

60

60

127

1

95

95

210

1

125

125

265

1 1/2

150

150

318

1 1/2

185

185

392

1 1/2

245

245

519

1 1/2

310

310

657

1 1/2

425

425

901

DN 80 3"

550

550

1165

DN 80 3"

850

850

1801

DN 100/4"

1100

1100

2331

DN 100/4"

1800

1800

3814

DN 150/6"

When working with other pressures than the nominal pressure, the actual FAD capacity is calculated by multiplying the correction factor with the rated AML capacity. The calculated actual flow capacity corresponds to the AML-stated pressure drop.

QDT series - Correction factors

For other compressed air inlet temperatures, divide the filter capacity by the following correction factor (Kt):

Inlet temperature °C

10

15

20

25

30

35

40

45

50

55

60

65

70*

75*

80*

Inlet temperature °F

50

59

68

77

96

95

104

113

122

131

140

149

158

167

176

Correction factor oil-free

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

Correction factor oil-lubricated

1

1

1

1

1

1

1.2

1.5

1.7

2.1

2.4

3

3.5

4.1

4.9

For other compressed air inlet pressures, multiply the filter capacity by the following correction factor (Kp):

Inlet pressure bar

3

4

5

6

7

8

9

10

11

12

13

Inlet pressure psi

44

58

73

87

102

116

131

145

160

174

193

Correction factor

0.57

0.77

0.83

1

1

1

1

1.05

1.05

1.11

1.18

Find the right filter for your application

The table below shows the various ISO 8573-1:2010 air purity classes and the Atlas Copco filters and dryer-combinations that meet these classes.

If you are unsure which ISO class you need but you do know what contaminant you have to protect your system from, then check out the general and special applications tables below. It will provide you with an overview of which Atlas Copco filters are the ideal solution for which contaminant.

Filter applications


ISO 8573-1:2010 class

Solid particles


Water


Oil

(aerosol, liquid, vapor)

Wet conditions

Dry conditions

0

As specified by the customer*

Oil-free compressor


1

DD+ & PD+


DDp+ & PDp+


Desiccant dryer

DD+ & PD+

  &          QD+/QDT

UD+

UD+

  &          QD+/QDT


2


DD+


DDp+


Desiccant dryer, rotary drum dryer

DD+ & PD+

UD+

3

DD+

DDp+

Desiccant dryer, membrane dryer, rotary drum dryer

DD+

4

DD+

DDp+

Membrane dryer, refrigerant dryer

DD+

5

DD+

DDp+

Membrane dryer, refrigerant dryer

-

6

-

-

Membrane dryer, refrigerant dryer

-

Dirt, water and oil are no match for Atlas Copco’s filters. They are designed to remove one or more of the following contaminants:

  • DIRT: dust, solid particles, rust particles, micro-organisms.
  • WATER: condensed liquid water, water aerosols, acidic condensates.
  • OIL: liquid oil, oil aerosol, hydrocarbon vapor.

dry-dust
Dry dust

micro-organism
Micro organism

oil-aerosol
Oil aerosol

wet-dust
Wet dust

oil-vapor
Oil vapor

Water-drops
Water drops

 

UD+ & QDT: the winning combination

The Atlas Copco UD+ - QDT filter train meets the requirements of air purity class 1 for total oil, according to ISO 8573-1:2010, in a typical compressed air installation:

UD+

QDT

Liquid oil & oil aerosol removal

Oil vapor removal

Guaranteed 0.0009 mg/m³ aerosol and liquid

Guaranteed 0.003 mg/m³ vapor

40% pressure drop reduction compared to DD+/PD+

65% pressure drop reduction compared to previous QDT

50% footprint reduction

Extremely compact compared to vessel designs

Flanged design
Flanged design
Threaded design
Threaded design
Tower design
Tower design
 

General applications

Name

DDp+

PDp+

DD+

PD+

UD+

QD+

QDT+

Grade

Rough

Fine

Rough

Fine

Ultimate

Basic

Optimal

Contaminant

Dry dust

Oil aerosol/wet dust

Oil vapor

 

Special applications

Name

H

High-pressure

SFA

Silicone-free

Grade

Rough & fine

Rough & fine

Basic

Rough & fine

Rough & fine

Basic

Contaminant Dry dust Oil aerosol/wet dust Oil vapor Dry dust Oil aerosol/wet dust Oil vapor


Certified filter trains

Filter train

Purity class according to ISO 8573-1:2010

Certified

UD+ - QDT - DDp+

[2:-:1]

yes

UD+ - QDT - DDp+ PDp+

[1:-:1]

yes

UD+ - QD+

[2:-:1]

yes

Some environmental or process aspects could cause a higher amount of hydrocarbons or other volatile organic compounds in the compressed air. Contact Atlas Copco when higher concentrations can be expected.


 

Temperature correction factors QD+

At higher temperatures, more compressor oil evaporates. When the actual working air inlet temperature differs from the reference, divide the filter capacity by the corresponding correction factors to obtain the correct capacity.

Inlet temperature °C

20

25

30

35

40

45

50

55

60

Inlet temperature °F

68

77

96

95

104

113

122

131

140

Correction factor oil-free

1

1

1

1

1

1

1

1

1

Correction factor oil-lubricated

1

1

1

1.2

1.5

1.7

2.1

2.4

2.6

Related products