ASTM-D – Download as PDF File .pdf), Text File .txt) or read online. Find the most up-to-date version of ASTM D at Engineering ASTM D Standard Test Method for Gross Calorific Value of Coal and Coke. standard by ASTM International, 10/01/ View all product details.
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Discussion – The heat capacity can also be referred to as the energy equivalent or water equivalent of the calorimeter. Corrected Temperature Rise – the calorimeter temperature change caused by the process that occurs inside the bomb corrected for various effects.
Thermometers – Platinum resistance or thermistor thermometers – shall be capable of measuring to the nearest 0. For both subsystems, the relationship between the thermometer astmm and temperature shall be well characterized. During ignition of a sample, the operator shall not extend any portion of the body over the calorimeter.
Replace cracked or significantly worn parts. The values stated in SI units are to be regarded as standard. Heat of Formation – the change in heat content resulting from the formation of 1 mole of a substance from its elements at constant pressure.
Standard Test Method for Gross Calorific Value of Coal and Coke
The bomb shall be capable of withstanding a hydrostatic pressure test to 20 MPa psig at room temperature without stressing any part beyond its specified elastic limit. For manually operated calorimeters, the ignition circuit switch shall be of the momentary double-contact type, normally open except when held closed by the operator.
Also consult the calorimeter equipment manufacturer’s atsm and operating instructions before using the calorimeter. Sample Holder – An open crucible or platinum, quartz, or base metal alloy.
The second and equally important aspect is the measurement subsystem.
Save my name, email, and site URL in my browser for next time I post a comment. Automated Calorimeter – a calorimeter which has a microprocessor that takes the thermometric readings and calculates the Calibration Value and the Heat of Combustion Values.
Additional precautions are noted in Practice E Oxidation of coal after sampling can d5856 in a reduction of calorific value.
ASTM D – 04 Standard Test Method for Gross Calorific Value of Coal and Coke
Ashm ammeter or pilot light can be used in the circuit to indicate when current is flowing. The resulting concentration 0. Combustion Bomb – Constructed of materials that are not affected by the combustion process or the products formed x5865 introduce measurable heat input or alteration of end products. A comparable amount of the analysis sample is burned under the same conditions in the calorimeter.
To minimize convection, the sides, top and bottom of the calorimeter vessel shall not be more than 10mm from the inner surface of the jacket. Ignition Circuit – A V alternating or direct current is required aetm ignition purposes. Adiabatic Calorimeter – a calorimeter that operates in the adiabatic mode and may or may not use a microprocessor. Base metal alloy crucibles are acceptable, if after three preliminary firings, the weight does not change by more than 0.
ASTM D – 13 Standard Test Method for Gross Calorific Value of Coal and Coke
Purity of Reagents – Use reagent grade chemicals conforming to the specification of the Committee on Analytical Reagents of the American Chemical Society in all tests. Calorimeter – a device for measuring calorific value consisting of a bomb, its contents, a vessel for holding the bombtemperature measuring devicesignition leads, water, stirrer, and a jacket maintained at aatm temperature conditions.
Reagent Water – Conforming to conductivity requirements for Type II of Specification D for preparation of reagents and washing of the bomb interior. The calorific value of benzoic acid, for us in the calibration calculations, shall be traceable to a recognized certificate value. For manually operated calorimeters, the ignition switch shall be depressed only long enough to fire the charge. The traceability of the heat of combustion of the benzoic acid calibrant in addition to meeting the aforementioned criteria.
ASTM D5865 – 13
Suitable reducing valves and adapters for 3- to 4-MPa to psig discharge pressure can be obtained from commercial sources of compressed gas equipment. In particular, lignite and sub-bituminous rank coal samples may experience greater oxidation effects than samples of higher rank coals. Test Area – An area free from drafts, shielded from direct sunlight and other radiation sources. Notify me of new posts by email.