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QD+, QDT Series

Oil vapor filtration for air compressors

QDT and QD+ series - The ideal solution for oil vapor filtration

Oil vapors pose a serious threat to compressed air systems, they can damage air-powered equipment and contaminate end products leading to increased operating costs. Top-quality air filters developed by Atlas Copco can protect your operation and from oil vapor.

Oil vapor filtration for air compressors

Key technical specifications

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Description

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

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 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.

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

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.

QD 145+

QD+ 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
    Water separation
  Precede with UD+ or DD+/PD+
    Dryer
  * In a typical installation with refrigerant dryer and UD+ filter.

QDT series

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.

QD 145+

QDT 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
  * After UD+ or DD+/PD+.

Certification

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.

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.

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. 

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.

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.

Air quality requirement

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.

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 -

Connect with our experts to know more

Air contaminants

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
Wet dust
Oil vapor

Dry dust

Micro organism

Oil aerosol

Wet dust

Oil vapor

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

Specifications

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.

QD+ series technical specifications

Filter size with or without inPASS™

Nominal capacity

Reference pressure

Maximum pressure

Connections

 

l/s

cfm

bar(e)

psig

7+

7

15

7

102

15+

15

32

7

102

25+

25

53

7

102

45+

45

95

7

102

75+

75

159

7

102

110+

110

233

7

102

145+

145

307

7

102

180+

180

381

7

102

240+

240

509

7

102

300+

 

300

636

7

102

With inPASS™

380+

380

805

7

102

425+

425

901

7

102

510+

630

1081

7

102

Without inPASS™

360+

360

763

7

102

430+

430

911

7

102

525+

525

1112

7

102

630+

630

1335

7

102

Flanged

 

 

 

 

550+F/630+F

550

1165

7

102

850+F/970+F

850

1801

7

102

850+T

850

1801

7

102

1100+F/1260+F

1100

2331

7

102

1100+T

1100

2331

7

102

1400+F/1600+F

1400

2967

7

102

1800+F/2200+F

1800

3814

7

102

2200+F/2400+F

2200

4662

7

102

3000+F/3600+F

3000

6357

7

102

4000+F

4000

8476

7

102

5000+F

5000

10595

7

102

6000+F

6000

12714

7

102

7000+F

7000

14833

7

102

8000+F

8000

16952

7

102

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 1.2 1.31 1.41 1.5

QDT series technical specifications

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 QDT flanged only.

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

Benefits

Technical benefits

Maximum oil vapor removal
Measuring air purity
Easy maintenance
Energy savings
QD open

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