E-book Compressed Air Filters
23 May, 2022
Filters play a crucial role in the proper treatment of compressed air. In this interactive e-book on filters you will learn everything on contaminants and which filters offer you optimal protection.
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.
- DD+/PD+ series
- UD+ series
- Air requirements
- Benefits
- Design
- Specification
- Downloads
- Additional readings
- Related products
- Services Contact us
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.
UD+ series
UD+ series
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.
Benefits
Technical benefits
Maximum durability
Lowest pressure drop
Reduces energy cost
8000hr service intervals
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
Micro organism
Oil aerosol
Wet dust
Oil vapor
Water drops
Design
Threaded design
Tower design
Flanged 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 | 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 | |
Downloads
Additional readings
Interactive ebooks
Guide Air Treatment
5 June, 2022
In this guide you will learn everything you need to know on air treatment. From different types of contaminants to knowing your air quality requirements; this guide covers all important air treatment topics.