Maker of liquid urea warns of consequences of improper storing or handling
SUBJECT: Maker of liquid urea warns of consequences of improper storing or handling
We have been advising our customers that as they consider EGR versus SCR as an emissions strategy for 2010, they should be aware of the many challenges that the liquid urea used in SCR will impose on them.
A new white paper – distributed by the urea industry itself – confirms these challenges.
The attached paper, called “Successful Urea/Diesel Exhaust Fluid Handling, Storage and Dispensing,” was sponsored by a leading maker of liquid urea, a leading distributor and a leading maker of dispensing pumps.
The paper points out the very exacting standards that will be necessary in storing and handling liquid urea, in order to avoid malfunctions and equipment problems.
Here are just some of the white paper’s warnings (italics added):
• “Storage temperatures higher than 86° F will detrimentally affect urea concentration and below 12° F, DEF will begin to crystallize. Both of these circumstances could render the product out of specification and unfit for sale.” (page 7)
• “Product impurities can detrimentally affect the after-treatment systems’ performance and void vehicle warranty guarantees due to premature catalyst deactivation and/or fouling of prefilters and injector nozzles.” (page 5)
• “Injectors are very sensitive, making purity extremely important, as any un-dissolved material may clog filters or injectors. Additionally, dissolved material can result in premature SCR catalyst failure.” (page 6)
• “Premature failure will activate the on-board vehicle diagnostics systems, dramatically reducing vehicle performance.” (page 6)
As you consider which technology will best meet your 2010 needs -- Advanced EGR, or liquid urea-based SCR – you need to be aware of all the problems and challenges posed by liquid urea.
Regards,
Mark Johnson
Marketing Communications Manager
Navistar, Inc.
Click on the following to download the White Paper. UREA_HANDLING_White_Paper_060909