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Information Section

 
Contents:
What is AdBlue?
What is an SCR?
What are the differences between EGR and SCR?
Storing and handling AdBlue correctly
What quality standards are in place?
How much AdBlue will I need?
Why choose Air1?
 
 

What is AdBlue?

AdBlue is a trade name for AUS32 (Aqueous Urea Solution 32.5%). It is injected into the exhaust gases of modern diesel engines as a post combustion process. Its purpose is to reduce the percentage of harmful NOx (Nitrous Oxides) present in the vehicles emissions.

The reaction takes place in a special piece of equipment called an SCR. The requirements to reduce vehicles harmful emissions (pollutants) are specified in European legislation, namely Euro 4, 5 and 6.

In order to reach the reduced levels of pollutants as defined within current and future European legislation, vehicle manufacturers need to call on one of two types of technology: either SCR (Selective Catalytic Reduction) or EGR (Exhaust Gas Recirculation).

AdBlue is made up from 32.5% Urea mixed with De-Ionised water. (Its full composition can be viewed here) AdBlue is only ever used in conjunction with an SCR.

 

What is an SCR?

SCR stands for Selective Catalytic Reduction. Vehicles which are equipped with an SCR will carry an AdBlue storage tank in addition to the standard fuel tank. AdBlue is transferred from the storage tank and injected under pressure into the exhaust gases where a series of chemical reactions take place.

The following diagram is supplied courtesy of Handling-AdBlue.co.uk

Essentially the process involves the AdBlue mixture being passed on to the super heated porous ceramic head of the SCR where the de-ionised water evaporates and the remaining urea is passed on as a reagent (breaking the Nitrous Oxides into mostly Nitrogen and Water).

Any contaminants present in the AdBlue will collect on the SCR, eventually causing it to clog and fail, therefore it is imperative for the AdBlue to remain free from impurities through all stages of production, storage and dispensing.

 

What are the differences between EGR and SCR technology?

Vialtis, the road services expert, have produced a report explaining the fundamental differences between Selective Catalytic Reduction and Exhaust Gas Recirculation. Including how each technology will cope with changes in future legislation. At present EGR technology cannot meet the requirements of Euro 6. You can view the report in our downloads section.

 

Storing and handling AdBlue correctly

Efficient AdBlue Transfer relies on suitable equipment being installed, failure to install the correct system can result either in premature product failure, or even worse a catastrophic event, such as SCR Failure.

AdBlue is very susceptible to contamination from both foreign matter and incorrect material selection. It is imperative that this is considered when deciding which dispensing solution is best for your application.

The main influence in this instance is where the de-ionised water element of the solution draws ions from materials which it comes into contact with, this changes the chemical composition of the AdBlue and causes salts to form which in turn clog the Ceramic head on the SCR.

The most common causes of premature SCR failures are typically either a result of the ingress of damaged pump parts being accidentally transferred into the AdBlue Tank or as a result of incorrect material selection. Inert materials should always be used to handle AdBlue.

The range of AdBlue transfer equipment which we supply is designed specifically to meet the demands of dispensing AdBlue from drums, IBC’s and fixed storage tank facilities.

 

What quality standards are in place?

There are strict standards in place to ensure the quality of AdBlue is not compromised. More information on these standards can be found in our downloads section.

DIN 70070 Standard for quality of AdBlue (now superseded by ISO 22241-1)
DIN 70071 European standard for quality of analytical AdBlue (test purposes)
ISO 22241-1

New ISO standard for the quality requirements of AUS32                    

ISO 22241-2 The ISO standard for testing the quality of AdBlue
ISO 22241-3 The ISO standard for handling, transportation and storage of AdBlue
ISO 22241-4 Currently under preparation, this standard will apply to the filling interface
   

How much AdBlue will I need?

The following table is provided courtesy of www.Handling-AdBlue.co.uk it provides a simple guide to your adblue requirements based on the volume of diesel fuel your SCR equipped fleet consums per week.

 

How Often You Want to Order AdBlue
week month quarter 6 months year
200
10
44
130
260
520
500
25
109
325
650
1300
1000
50
218
650
1300
2600
2000
100
435
1300
2600
5200
3500
175
761
2275
4550
9100
5000
250
1088
3250
6500
13000
8000
400
1740
5200
10400
20800
10000
500
2175
6500
13000
26000
15000
750
3263
9750
19500
39000
20000
1000
4350
13000
26000
52000
25000
1250
5438
16250
32500
65000
 
key
Cans 10, 20 litre
 
Drums 210 litre
 
IBC 1000 litre
 
Fixed Tank Installation 1000 litre +
 

Why choose Air1?

Guaranteed Supply
Air 1 is the industry recognised leading AdBlue Solution. Produced by the world’s largest AdBlue manufacturer Yara and delivered throughout Europe by leading chemical distributor Brenntag.

Unrivalled Availability
With several production plants across Europe and 14 distribution centres across the UK, customers of the Air 1 solution are assured that the AdBlue product is never in short supply.

Premium Product Quality
Air 1 is guaranteed to meet the strict requirements of ISO22241 in full. With a fully traceable supply chain spanning from manufacture through to point of delivery, peace of mind is delivered by way of our quality assured distribution network.  


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