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Struggling to stay on top of all the acronyms and technical terms associated with U.S. EPA Tier 4 Final emissions standards? This quick decoder will help you keep the terminology straight.
ACRONYM |
DEFINITION |
|
DEF |
Diesel Exhaust Fluid DEF is a carefully blended solution of high-purity urea and de-ionized water used in SCR solutions. It’s injected into the exhaust system, where it decomposes into ammonia, then selectively reduces NOx with the help of a catalyst. |
|
DOC |
Diesel Oxidation Catalyst A DOC is an aftertreatment device that reduces PM by converting carbon dioxide and hydrocarbons to carbon dioxide and water vapor. It optimizes nitrogen monoxide and nitrogen dioxide ratios for both passive DPF regeneration and the optimal conversion of NOx in SCR. |
|
DPF |
Diesel Particulate Filter A DPF is an aftertreatment device that captures PM formed during combustion. It can be regenerated passively or actively and allows for lower fuel consumption and better transient response and performance. |
|
EGR |
Exhaust Gas Recirculation EGR reduces the levels of NOx emitted by an engine by recirculating exhaust gas into the engine’s cylinder and replacing some of the air with carbon dioxide. That lowers combustion temperature and reduces the amount of NOx formed. |
|
NOx |
Nitrogen Oxides NOx gases are produced from the reaction of nitrogen and oxygen during the combustion of fuels, especially at high temperatures. They’re one of two primary exhaust pollutants covered by emissions standards. |
|
NRS |
NOx Reduction System NRS reduces the levels of NOx emitted by an engine by recirculating exhaust gas into the engine’s cylinder and replacing some of the air with carbon dioxide. That lowers combustion temperature and reduces the amount of NOx formed. |
|
PM |
Particulate Matter PM is a complex mixture of extremely small particles and liquid droplets that get into the air, including dust, dirt, soot and smoke. It’s the second of two primary exhaust pollutants covered by emissions standards. |
|
SCR |
Selective Catalytic Reduction SCR is a catalyzed chemical reaction that reduces NOx to water and nitrogen using diesel exhaust fluid. This fluid is injected into a tube where it mixes with the exhaust, and the reactions take place as the mixture passes through the SCR catalyst. |
|
ULSD |
Ultra-Low-Sulfur Diesel ULSD is diesel fuel with substantially lower sulfur content that contributes to PM reductions in non-road engines and equipment. Many advanced emission-control technologies require the use of ULSD. |
What if you could reduce runtime on your drilling rig engines up to 25 percent, cut fuel consumption up to 10 percent and increase gas consumption as well — without sacrificing power and productivity? With Smart EMS, you can.
Learn MoreLet’s get to the truth about land drilling engines featuring Exhaust Gas Recirculation (EGR) technology — specifically the Cat® 3512E Tier 4 Final Land Electric-Drive Drilling Engine.
Learn MoreLet’s get to the truth about land drilling engines featuring Exhaust Gas Recirculation (EGR) technology — specifically the Cat® 3512E Tier 4 Final Land Electric-Drive Drilling Engine.
Learn MoreIf you’re still using EIP (Electronic Instrument Panel) to monitor your rig’s engines, it’s time for an upgrade. This easy-to-use control panel, proven in the electric power industry, simplifies diagnostics and troubleshooting.
Learn MoreIf you’re still using EIP (Electronic Instrument Panel) to monitor your rig’s engines, it’s time for an upgrade. This easy-to-use control panel, proven in the electric power industry, simplifies diagnostics and troubleshooting.
Learn MoreIt’s not easy to remember all the acronyms associated with U.S. EPA Tier 4 Final emissions standards for land drilling rigs. Use this simple guide to keep the terminology straight.
Learn MoreUse this white paper to compare the Cat® 3512E Tier 4 Final Land Electric-Drive Drilling Engine to the previous Tier 2 model, the 3512C, as you prepare to transition your rigs to meet emissions standards.
Learn MoreUse this white paper to compare the Cat® 3512E Tier 4 Final Land Electric-Drive Drilling Engine to the previous Tier 2 model, the 3512C, as you prepare to transition your rigs to meet emissions standards.
Learn MoreBoth Exhaust Gas Recirculation (EGR) and Selective Catalytic Reduction (SCR) have their strengths when it comes to emissions reduction, but when you look at the facts, EGR is the clear winner on land.
Learn MoreBoth Exhaust Gas Recirculation (EGR) and Selective Catalytic Reduction (SCR) have their strengths when it comes to emissions reduction, but when you look at the facts, EGR is the clear winner on land.
Learn MoreLand drilling customers told us they had five big requirements for Tier 4 Final engines — here’s how the 3512E delivers on all of them.
Learn MoreLand drilling customers told us they had five big requirements for Tier 4 Final engines — here’s how the 3512E delivers on all of them.
Learn More