Semler Industries explains the effects of DEF crystallization

Christopher Goodfellow - 20 January 2012

A new video from Semler Industries, a provider of Diesel Exhaust Fluid (DEF) pump and storage solutions, shows how DEF can become crystallized and why the fluid needs to be protected.

Salim Rowe, Development Specialist at Semler Industries talks us through the issues:

DD: Why do end-users need to worry about DEF crystallization?  
SR: Crystallization is a threat because it indicates that there is an air leak in the system.  Air leaks compromise the quality of the DEF and may indicate other contaminants.

DD: What steps are taken in pump design to avoid crystallization?
SR: Some methods include flanged connections, rather than threaded, which help avoid the leaks and contamination issues.  Other areas for crystallization to occur are at the tote and connectors.  There will always be "some" drip of fluid on the connectors, but the risk can be minimized by using the best connectors.

DD: What tips do you have for owners/operators to avoid these issues?

SR: Some steps to take include:

1) Make sure that operators are trained on the sensitivity of DEF to air as shown in the video
2) Use premium connections to assure air and contaminants are avoided   
3) Make sure to regularly check equipment for leaks and repair immediately if problems arise   
4) Use the proper equipment suppliers that test, inspect and seal their equipment to assure the highest cleanliness possible.