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dd+, pd+, ud+ series

Coalescing filters for optimal protection

Compressed air contaminated by dust, water and oil needs to be properly treated to protect your system and your end product. Atlas Copco has developed various top-quality oil-coalescing filters that ensure your operation runs smoothly, that the service life of your equipment is maximized and that your end products meet even the most stringent quality standards.

Coalescing filters for optimal protection

Key technical specifications

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DD+/PD+ series

DD+/PD+ series

The lubrication of the compressor element or the compressor installation itself can produce oil aerosols, wet dust and water drops that could harm the entire air system. Atlas Copco’s DD+ and PD+ filters that use the oil coalescence filtration process to efficiently reduce these contaminants and ensure that your system runs more smoothly and efficiently.

These high-performance, oil-coalescing filters are engineered to cost-effectively provide top air purity at a low pressure drop. Thanks to their high-efficiency glass-fiber technology and a coarse 3D-structured layer/barrier, the DD+/PD+ series allows you to meet increasingly stringent air quality demands.

Their stainless-steel cores, epoxy-sealed caps and anti-corrosive coated filter housing make the filters especially reliable.

Compressed Air Filter DD+ 35 PD 35+

UD+ series

UD+ series

Product shot twin filters UD 850+ T

The UD+ series combines two filtration steps (DD+ and PD+) into a single unique technology that allows you to meet the high quality requirements of various applications while providing ultimate energy savings. However, they do not just save you money, but also space by eliminating the need for a second filter.

At the same time, these two-in-one coalescent filters protect your equipment and processes by efficiently reducing oil aerosol, wet dust and water droplets in your compressed air stream. The UD+ series ensures a lower pressure drop than a conventional filter combination, which results in energy savings. Thanks to the thick filter package, these filters also provide an air purity equal to that obtained by using two separate filters in a row.

With a patented drainage technology, the UD+ series prevents oil droplets from re-entering the air stream.

DD+, PD+, UD+ Performance

  DD+ PD+ UD+
Contaminant Oil aerosol/wet dust
Filtration technology Wrapped
Test method ISO 8573-2:2018, ISO 12500-1:2007
Maximum oil carry-over (mg/m³)* 0.08* 0.008* 0.001
ISO class 8573-1 [2:-:3] [1:-:2] [1:-:2]
Average wet pressure drop (mbar) 119 132 220
Element service After 8,000 operating hours or 1 year
For flanged filters: after 4,000 operating hours or 1 year or 350 mbar pressure drop
Precede with Water separation Water separation & DD+ Water separation
*Inlet oil concentration = 10 mg/m³. Oil = oil aerosol and liquid.

Air requirements

Know your air quality requirements

If you are unsure, and only know that you have to protect your system from dust, then you need to find out your air quality requirements. For some applications, such as inflating tires, some contaminants in the compressed air do not pose any problems. Others, such as applications in cleanroom environments, require the highest air purity.

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.

Certification

  • ISO 8573-4:2019
  • ISO 12500-3:2009

Find out more useful information on the DDp+/PDp+ series in our brochure.

For filtering out dust (as well as other contaminants), Atlas Copco also offers the high-pressure H series of filters and its silicone-free SFA series.

Wet dust and oil aerosols pose serious threats to your compressed air system. If they enter the air stream, they can harm your pneumatic equipment and your end products, which could significantly increase your operating costs. Atlas Copco’s oil coalescence filters are designed specifically to filter wet dust and oil aerosol to ensure optimal filtration results.

The ideal filtration technology

DD+/PD+ and UD+ oil-coalescing filters use the wrapped technology that is especially effective for wet particles. The wrapped filtration media offer durability in wet and oil-contaminated environments. The patented Nautilus technology of the coalescing filter series combines multiple wrapped layers to ensure constant air quality in the harshest conditions.

inPASS™ bypass

In addition to outstanding oil coalescence filters, you also get 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 to 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 service indicator allows for an easy check of the filter’s running hours, differential pressure, and the maintenance status. It can even send a remote alert for your peace of mind.

Cutting-edge filtration technology

Atlas Copco’s dedicated filtration team is always looking for ways to give you a competitive edge in your compressed air system. Our new generation of oil coalescence filter series feature several innovations that make your filtration system more efficient and its operation easier. Here are just three examples of how this oil-coalescing technology works.

Get a free quote from our Atlas Copco experts

Benefits

Technical benefits

Maximum durability
Lowest pressure drop
Reduces energy cost
8000hr service intervals
UD+ compressed air filter - inPASS

Find the right filter for your application

The table below shows the various ISO 8573-1:2010 air purity classes and the Atlas Copco coalescing 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    
  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 -

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 icon
Wet dust icon
Oil vapor icon

Dry dust

Micro organism

Oil aerosol

Wet dust

Oil vapor

Water drops

Design

Threaded design

 Threaded design filter

Tower design

Tower design filter

Flanged design

Flanged design filter

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 SFA
High-pressure 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

Correction factors

When working with other pressures than the nominal pressure, the actual Free Air Delivery (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.

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

Specification

DD+/PD+/UD+/DDp+/PDp+/QD+ series

Technical specifications: sizing

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

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