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COAL & COKET E S T I N G
888.325.8517 | www.ClarkTesting.com
COAL & COKET E S T I N G
Service, Standards, Quality & Reliability These are the principals by which Clark Testing operates its coal and coke division. We
are Clark testing offering- superior testing that reaches the world.
Clark Testing provides comprehensive and specialized testing, consulting, training and
inspection services for its clients in the coal and coke industry, whether metallurgical or
While tests determining chemical and physical analysis are a strong part of Clark’s
everyday portfolio, unique programs such as coal quality verification services,
shipment monitoring, ‘ISO, QMS and EMS audits, shipment monitoring and freeze
conditioning agent application are also available. We ensure our clients know every
detail about their materials during different stages of the process.
In our state of the art laboratories, we deliver timely, accurate and independent results
for all standard coal and coke tests. In addition, we can also handle all of your
environmental coal testing needs from total carbon, sulfur, mercury, chlorine, lead, ash
chemistry and trace elements.
Our experienced team monitors the coal quality of shipments from port, terminal and
inland facilities, mine sites, lab sites and prep plants for delivery across the globe –
touching industries from steel and oil to electric and utilities. Through our exact
monitoring and testing procedures, Clark can determine a coal samples’ true coking
potential to best serve the end user.
Other services unique to the Clark team include bias testing, critical inspections and
maintenance on sampling systems. We are also one of the few labs that can do
CRI/CSR tests specifically for the Steel Industry.
As an active member of the ASTM organization, we are well versed in coal and coke
standards. In addition, Clark Testing is a member of ISNetworld. We pride ourselves on
client service, responsiveness and safety. We exceed safety standards by keeping
experienced MSHA certified instructors and trainers on staff. We are here to address our
customers’ questions and provide answers they need at all times - - around the globe.
SERVICES FOR THE COAL INDUSTRY
Clark Testing works hand-in-hand with your operations to provide cost-effective solutions to
minimize operational and financial risk. Our global technical leadership and industrial
expertise provides an unrivalled global benchmark of experience and value to control
your coal operations.
Clark has the capability to provide you with a wide range of services including:
LABORATORY TESTING • Analysis of Coal and Coke
• Steam Coals
• Metallurgical Coals
• Blast Furnace Coke
• Foundry Coke
• Petroleum Coke
• Float-Sink Washability testing
• Commercial & Supplier Lab Audits
• ASTM Standards
• ISO 9000
• Customized Quality Assurance Programs
• Training Programs
SAMPLING SERVICES • Sample collection
• Lot sampling
• Channel sampling
• Manual sampling
• Sampling system audits and preventative maintenance
• Bias testing
TRADE SERVICES • Hold inspection
• Loading and discharge supervision
• Rail, vessel and barge assessment
• Vessel and barge gauging
• Draft surveys
• Quality and quantity evaluations
COAL PREPARATION PLANT SERVICES • Plant audit/efficiency tests and plant sampling
• Optimization and troubleshooting consulting
COAL & COKET E S T I N G
SERVICES COAL ANALYTICAL
Clark Testing laboratories offer a broad range of analytical services to the coal industry.
We provide accurate, cost effective chemical analysis in accordance with international
standards to minimize your risks and optimize your operations.
Clark provides a complete range of laboratory procedures to meet all your
requirements whether you are a producer, transporter or consumer of coal. All
laboratory analysis are performed in accordance with recognized global standards
such as American Society for Testing and Materials (ASTM) and International Standards
Organization (ISO). Our qualified technicians operate in laboratories with state-of-the-art
instrumentation. This allows us to provide you with complete, accurate and timely coal
QUALITY ASSURANCEClark operates a quality assurance program to ensure our data meets international
quality standards. Quality assurance standards are constantly monitored through
participation in numerous industry and organizational programs. Our labs use concepts
of Total Quality Management (TQM) and Continuous Improvement to ensure consistent
operation on a daily basis. TQM is a comprehensive and structured approach to
laboratory work that seeks to improve the quality of analysis through ongoing
refinements in laboratory processes based on continuous quality feedback.
COAL AND COKE TESTINGOur experienced technicians will provide you with the following chemical analyses
applicable to all types of coal and coke.
• Proximate Analysis
• Ultimate Analysis
• Calorific Value (Btu)
• Elemental Analysis
• Ash Chemistry
• Trace Elements
• TCLP/Toxicity Testing
SPECIALTY METALLURGICAL COAL TESTING
Clark specializes in metallurgical coal evaluations for the cokemaking/steel industry. The
following unique tests and services are available:
• Rheological Properties
• Movable Wall Oven
• Sole-heated Oven
• Coke Quality Computer Modeling COAL & COKET E S T I N G
COAL & COKE CHEMICAL ANALYSES
Proximate and Sulfur Analysis
The Proximate and Sulfur analysis is basic to all coal & coke evaluations. The Proximate
consists of the following suite of tests: Moisture, Ash, Volatile Matter and Fixed Carbon (by
Coal is analyzed for the following as part of an evaluation for its use as a fuel. Carbon,
Hydrogen, Nitrogen, Oxygen (by difference), Ash, and Sulfur
Ash Chemistry – Major Elements
The analysis of coal or coke ash provides important information for blast furnace and
coal utility operations. The following elements are typically tested: SiO2, Al2O3, Fe2O3,
TiO2, CaO, MgO, Na2O, K2O, P2O5, MnO2, SO3, BaO, SrO
Trace element analysis is critical to evaluating coals for environmental regulations. The
following are often requested: arsenic, beryllium, boron, chromium, lead, mercury,
selenium, vanadium, zinc. Additional elements are available at the customer’s request.
METALLURGICAL COAL AND COKE TESTING
RHEOLOGY, CARBONIZATION, REACTIVITY, PETROGRAPHY
Coking coals possess the ability, when heated in the absence of air, to soften, swell and
then re-solidify to form a coherent, porous, hard coke structure. The Gieseler Plastometer
and Arnu Dilatometer tests are used to evaluate the rheological or plastic properties of
a coal or coal blend.
Gieseler Plastometer Test
The Gieseler Plastometer test is used to determine the plasticity range of coals, including
the temperature at which initial softening, maximum fluidity, and resolidification occur.
We use the Preiser Model 4000 Plastometer, which meets all ASTM D2639 to ensure your
coals are optimal for coking.
Arnu Dilatometer Test
We use the Preiser Dilatometer for the determination of the dilatation or swelling of coal
as a function of temperature. It is designed with state of the art microprocessor
technology; the most precise and efficient model available. The fully automatic system
is designed around ASTM D 5515 and ISO Standard 349 for the Audibert-Arnu method of
COAL & COKET E S T I N G
The coal petrographic analysis is a microscopic technique used to predict
metallurgical coke strength or stability by the ASTM tumbler test. It consists of two parts:
one to determine the percentage of the organic entities derived from the preserved
plant parts and the other to determine the percentage of light reflected from the
dominant organic entity called vitrinite. It is a key tool in the characterization of
metallurgical coals for cokemaking.
Pilot coke ovens of various sizes and designs are used to measure critical parameters
such as coking pressure and coke mass contraction or expansion. Commercial coke
ovens have limited tolerance to coking pressure and must contract sufficiently to exit
the oven at the end of the coking cycle. Test coking coal blends can safely be
evaluated in pilot ovens prior to charging to commercial coke ovens. Enough coke is
produced in the pilot ovens to provide samples for ASTM tumbler, CRI/CSR and
Consulting services are available to assist our clients in coal selection and blending
for the cokemaking industry. Computer models, fed by single coal analyses, are
utilized to predict coke quality and formulate optimum coal blends for cokemaking.
Predicted coke quality parameters include: coke strength (stability and CSR),
chemistry, coking pressure, coke mass contraction and microscopic analysis.
COKE TESTINGKnowing the physical properties of Coke is important as it predicts how coke will
behave in a Blast furnace. The two tests run most often are Coke Reactivity (CRI/CSR)
and Tumbler Test (Stability and Hardness). Clark Testing performs both these tests along
with size consist, chemical analysis, and microscopic analysis.
Coke Reactivity Index (CRI) and Coke Strength after Reaction (CSR)
When coke descends in the blast furnace, it is subjected to reaction with
countercurrent CO2 and abrasion. These concurrent processes weaken the coke and
chemically react with it to produce excess fines that can decrease the permeability of
the blast furnace burden. The Coke Reactivity Test is a two part procedure. First, The CRI
test measures coke reactivity in carbon dioxide at elevated temperatures then its
strength after reaction (CSR) by tumbling. Most blast furnaces will require a coke with a
CSR greater than 60 and CRI less than 25.
ASTM Tumbler Test
This test measures the resistance of coke to degrade from impact and abrasion during
its descent in the blast furnace. Twenty-two pounds of 3” by 2” sized coke is tumbled in
a drum of specific dimensions for 1400 revolutions at 24 rpm. The coke is then
screened and the percent + 1" is stability and the cumulative percent + ¼” is the
hardness. Most blast furnace operators require +60 stability coke.
COAL & COKET E S T I N G
Clark Testing is the world’s leading provider of cargo and vessel inspection services to buyers and sellers involved in the movement of goods worldwide.
Clark’s inspections of ships, barges, trains, etc ensure that the condition of the carrier is
suitable for the shipment of your cargo. We identify any problems that might affect the
cargo during shipment and ensure they are addressed before it is too late. Our
inspectors also represent you during loading and unloading. Inspectors conduct
inspections of various vessel conditions and perform visual inspections to verify that the
cargo being shipped as described on the order form.
In addition to verifying the condition of the carrier is appropriate, Clark offers complete
cargo inspections before, during and after shipment. Reliable and independent weight,
quantity and quality inspections ensure the contractual compliance of your shipments.
Clark cargo inspections are conducted for producers, traders and blenders to
accurately verify the weight and quantity of shipments at ports and inland
Whether you are buying or selling, the inspection certificate or report provided by an
independent Clark Testing inspector upon completion of the shipment inspection
assures you an honest, accurate assessment of your commodity and the vessel.
Clark Testing’s commercial cargo services include:
• Draft Surveys
• Loss Prevention
• Stockpile Inventory Measurement
• Belt Scales and Hopper Scales
Clark Testing’s commercial carrier inspection services include:
• Hold and Hatch Inspections
• Visual Inspections
• Bunker and Conditional Surveys
Clark has earned a worldwide reputation for accurate and ethical cargo and vessel
services. Even if you cannot be at the load port or the discharge port to meet your
cargo, you can trust Clark Testing to honestly and accurately represent your interests.
COAL & COKET E S T I N G
TRAININGCOAL AND COKE
Freeze Conditioning Agent Application & MonitoringFCA is utilized by our customers to ensure that all coal is reclaimed from railcars and
trucks during the winter months. Coal is lost in cold temperatures due to freezing to the
sides of railcars and trucks or to itself not allowing for a free flow of coal during
unloading. The FCA chemical assists in allowing for the free flow of the coal and the
prevention of coal sticking to the sides of the railcars or trucks. Coal and Coke
producers could potentially lose thousands of dollars of material during one winter
season if the FCA is not applied correctly or amply. Clark Testing ensures that the
chemical is applied properly and at the correct dosage amounts with the proper
chemical for multiple suppliers. Clark Testing also assists in the inventory control,
ordering of chemical, and if needed general maintenance of the FCA systems. Clark
Testing stands out from other FCA entities due to its independent relationship with the
customers and suppliers, and the commitment to strict monitoring, quality application
and product verification.
ISNetworld Clark is a member of the ISNetworld, a global resource for connecting corporations with
safe, reliable contractors/suppliers from capital-intensive industries. ISN collects
self-reported conformance information from contractors/suppliers, verifies its accuracy,
and then reports the results in an easy-to-follow format. This allows corporations to select
those resources that best meet internal and governmental requirements, while providing
contractors/suppliers the opportunity to centralize their conformance information, saving
time and gaining presence in the marketplace.
The professionals at Clark Testing are leaders in the industry. Collectively, they have
abundant years of experience. Our team leads the coal and coke industry by setting
standards, being involved in the evolution of technology and coal but most importantly,
by sharing their knowledge with tomorrow's leaders.
On a regular basis, our technical experts conduct training classes on and off-site
educating the future leaders in the Coal and Coke industry. We welcome the
opportunity to train your team today:
Coal & Coke Seminars
Conducted by a coal and coke pioneer, we offer an array of technical concepts
pertinent to the coal and coke industry. Details are available under Coal & Coke at
We recognize the importance of safety in the coal and coke industry. In an effort to
share our knowledge we can certify your staff according to MSHA. Call today to meet
our experienced team and expand your horizons.
COAL & COKET E S T I N G