Cummins Dual Fuel Engines For Oil And Gas Well Servicing Applications.

EveryTM Dollar. Saved.

332386_Cummins_Brochure.indd 2 4/29/13 10:33 AM

Dual Fuel Operation

Dual Fuel Overviewn Mixes natural gas with intake air

n Diesel provides ignition source—no spark plugs

n Diesel start-up, power density and transient performance

n Gas replaces diesel with 50–70% substitution rate

Diesel

Natural Gas

Air

Liner

Piston

Crankshaft

Connecting Rod

Intake SystemCylinder Head

Natural Gas–Air Mixture

Diesel Spray

IN

IN

IN

Liner

Piston

Intake SystemNatural Gas

Cylinder Head

Diesel Spray

Air Diesel

Natural Gas/ Air Mixture

Connecting Rod

Crankshaft

Savings At Every™ Site.The fuel used to power a frac spread is a major contributor

to the total cost of operation at your well site. Now and for

the foreseeable future, natural gas is in abundant supply

at a much lower cost than diesel fuel. Cummins Dual Fuel

technology takes advantage of this by:

n Reducing fuel costs by up to 40 percent

n Providing a 10 percent reduction in carbon dioxide

(CO2) emissionsn Promoting energy independence

n Improving your bottom line

How Do Dual Fuel Engines Work?

A dual fuel engine is based on a traditional diesel engine,

with the addition of dual fuel-specific hardware. Cummins

oil and gas dual fuel engines operate with integrated

controls, making a seamless transition from diesel fuel to

dual fuel operation. When the engine is operating in dual

fuel mode, natural gas is introduced into the intake system.

The air-to-natural gas mixture from the intake is drawn into

the cylinder, just as it would be in a spark-ignited engine,

but with a leaner air-to-fuel ratio.

Near the end of the compression stroke, diesel fuel is

injected, just as it would be in a traditional diesel engine.

The diesel fuel ignites, and the diesel combustion causes

the natural gas to burn. A dual fuel engine can operate on

either 100 percent diesel fuel or the substitution mixture of

diesel and natural gas, but it cannot operate on natural gas

alone. Dual fuel engines deliver the same power density,

torque and transient response as the base diesel engine.

Every Dollar. Saved.

The flexibility to be able to run on 100 percent diesel fuel

is a great option for regions in which the supply of natural

gas is unreliable. Total fuel savings will vary depending on

the type of natural gas being used – compressed natural

gas (CNG), liquefied natural gas (LNG) or field gas. An

operator can run on a lower-cost, lower-quality gas at a

lower substitution rate, or use a higher-quality fuel at a

slightly higher cost with a higher substitution rate.

Dual Fuel Operation.

Optimizing The Mixture.

A critical parameter for dual fuel operation is the substitution

rate, which is defined as the fraction of the total fuel energy

that is provided by the natural gas. Substitution rates vary by

load, however, Cummins dual fuel engines can provide up to

70 percent substitution rates.

Dual Fuel Engine Fuel Source

Annual Fuel Cost For A 2500 HP Pressure Pumping Engine.

Diesel Gas

0

$100,000

$200,000

$300,000

$400,000

$500,000

$600,000

$700,000

$800,000

$900,000

Diesel LNG CNG Field Gas

Savings

Total Fuel Cost:

$830,572

Total Fuel Cost:

$716,369

Total Fuel Cost:

$659,267

Total Fuel Cost:

$433,144

Cover image: ©2013 Baker Hughes Inc. All rights reserved.

332386_Cummins_Brochure.indd 3 4/30/13 2:36 PM

Diesel Oxidation Catalyst (DOC)

Lifting EyesRain Cap

Catalyst Access Panel

Outlet Exhaust Temperature Sensor

Inlet Exhaust Gas Temperature Sensor

Remote-Mounted Integrated Control Panel

Navigation

Power Switch

Engine Conditions Meet Dual Fuel Operational Requirements

Gas Substitution Active (DSOV Open)

Engine Knocking Detected

Gas E-Stop

Display Screen

Alarm

QSK50 Dual Fuel

Off-Engine Gas Train

Gas Filter

Pressure Gauge

Dual Shutoff Valve

Mixer Mixer (Back Side)Exhaust Gas Temperature Sensor

Fuel ActuatorReversible Gas Inlet

Gas Balancing Orifice

Denotation Sensors Formed Steel Distribution Manifold

Balance Line

Proof of Closure Switch

Pressure Regulator

332386_Cummins_Brochure.indd 4 4/29/13 10:33 AM

Cummins Inc. Box 3005 Columbus, IN 47202-3005 U.S.A.

Phone: 1-800-DIESELS™ (1-800-343-7357)Fax: 1-800-232-6393Internet: CumminsOilandGas.com

Twitter.com/CumminsEngines YouTube.com/CumminsEngines

Bulletin 4087304 Printed in U.S.A. 4/13 ©2013 Cummins Inc.

Every Engine. Cleaner.

In the United States, dual fuel engines must meet the

applicable compression ignition emissions regulations

and U.S. Environmental Protection Agency (EPA) diesel

requirements. While specifics may vary, an oxidation

catalyst is typically required in order to lower carbon

monoxide (CO) and non-methane hydrocarbons. The

Cummins dual fuel system is compliant with 40GFR09

EPA Tier 2 regulations using a Cummins Diesel Oxidation

Catalyst (DOC). The DOC is a drop-in replacement for the

equipment’s muffler, and is composed of stainless steel.

Smaller Carbon Footprint. Bigger Production Capacity.

Natural gas substitution, with its lower carbon footprint,

provides an opportunity for diesel engines to become

even “greener.” Cummins dual fuel engines produce up to

10 percent less CO2 than diesel engines due to the lower

carbon-to-hydrogen ratio of natural gas. In states with a

restricted carbon footprint, such as Wyoming and Utah,

this means that you can operate more equipment, drill

more wells and achieve higher production from every well.

Every Confidence.

Cummins dual fuel engines are backed by the best

warranty in the industry, with full coverage for unlimited

hours the first year, extending through 2 years or

2,000 hours, whichever comes first. Major-components

coverage continues through 3 years or 10,000 hours.

Cummins engines with a dual fuel retrofit kit carry a full-

coverage warranty for 1 year or 1,000 hours, whichever

comes first. These warranties include progressive engine

damage coverage.

Better Service. Every Engine.

The Cummins parts and

service network is the world’s

largest and most capable,

with over 600 authorized

distributors around the globe. For more information,

call 1-800-DIESELS™ (1-800-343-7357) or go to

cumminsengines.com.

Every Question. Answered.

For more information about Cummins dual fuel engines

for the oil and gas market or our worldwide capabilities,

visit cumminsoilandgas.com or contact your local

Cummins distributor.

332386_Cummins_Brochure.indd 1 4/30/13 2:37 PM