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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Thermometers – Platinum resistance or thermistor thermometers – shall be capable of measuring to the nearest 0. The stirrer speed shall remain constant to minimize any temperature variations due to stirring. These types of thermometers consist of two major subsystems. Equip the oxygen supply cylinder with an approved type of safety device, such as a relief valve, in addition to the needle valve and pressure gauge used in regulating the oxygen feed of the bomb.
The gross calorific value can be used for computing the calorific value versus sulfur content to determine whether the coal meets regulatory requirements for aatm fuels. Test Area – An area free from drafts, shielded from direct sunlight and other radiation sources. Check the pressure gauge annually for accuracy or after any accidental over pressures that reach maximum gauge pressure. Aetm magnifier shall have a lens and holder designed so as to v5865 errors as a result of parallax.
Base metal alloy crucibles are acceptable, d55865 after three preliminary firings, the weight does not change by more than 0.
The immersed portion of the stirrer shall be accessible to the outside through a coupler of low thermal conductivity.
ASTM D – 13 – Standard Test Method for Gross Calorific Value of Coal and Coke
Mechanical supports for the calorimeter vessel shall be of low thermal conductivity. The initial temperature before initiating the combustion and the final temperatures are recorded by the operator or the microprocessor. Automated Calorimeter – a calorimeter which has a microprocessor that takes the thermometric readings and calculates the Calibration Value and the Heat of Combustion Values.
Adiabatic Calorimeter – a calorimeter that operates in the adiabatic mode and may or may not use a microprocessor. Heat of Formation – the change in heat content resulting from the formation of 1 mole of a substance from its elements at constant pressure. Crucible Liner – Quartz fiber or alundum for lining the crucible to promote complete combustion of samples that do not burn completely during the determination of the calorific value.
Its size shall be such that the bomb is completely immersed in water during determination. Replace O-Rings and valve seats in accordance with manufacturer’s instruction.
Continuous stirring for 10 min shall not raise the calorimeter temperature more than 0. The second and equally important aspect is the measurement subsystem.
Sample Holder – An open crucible or platinum, quartz, or base metal alloy. Isoperibol Calorimeter – a calorimeter that operates in the isoperibol mode and uses a microprocessor to record the initial and final temperatures and make the appropriate heat leak corrections during the temperature rise. The balance shall be checked weekly, at a minimum, for accuracy.
It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. The vessel shall be of such construction that the environment of the calorimeter’s entire outer boundaries can be maintained at a uniform temperature.
For more details, consult the manufacturer. The following precautions are recommended for safe calorimeter operation. Asgm shall be no gas leakage. Net Calorific Value net heat of combustion at constant pressureQp net – the heat produced by combustion of a substance at a constant pressure of 0.
The gross calorific value can be used to compute the total calorific d8565 of the quantity of coal or coke represented by the sample for payment purposes. Discussion – The heat capacity can also be referred to as the energy equivalent or water equivalent of the calorimeter.
ASTM D5865-12 – International Standards
The gross calorific value can be required to classify coals according to Classification D The BTU used in modern steam tables is defined by the means of the relation, 1 I. Oxidation of coal after sampling can result in a reduction of calorific value.
In particular, lignite and sub-bituminous rank coal samples may experience greater oxidation effects than samples of higher rank coals. Notify me of new posts by email.
ASTM D – 13 Standard Test Method for Gross Calorific Value of Coal and Coke
Heat Capacity – the energy required to raise the temperature of the calorimeter one arbitrary unit. Valves, gauges, and gaskets shall meet industry safety codes. Inspect the bomb parts carefully after each use. Sorry, your blog cannot share posts by email.
Calorific Value – the heat produced by combustion of a asrm quantity of a substance under specified conditions. Do not fire the bomb if there is evidence of gas leakage when the bomb is submerged in the calorimeter vessel. Specific hazard statements are given in Section 8. Platinum or palladium wire, 0. For manually operated calorimeters, the ignition switch shall be depressed only long enough to fire f5865 charge. Reagent Water – Conforming to conductivity requirements for Type II of Specification D for preparation of reagents and washing of the bomb interior.
For manually operated calorimeters, the ignition circuit switch shall be of the momentary double-contact type, sstm open except when held closed by the operator. Calorimeter Vessel – Made of metal with a tarnish-resistant coating, with all outer surfaces highly polished. Thermometer Accessories – A magnifier is required for reading liquid-in-glass thermometers to one tenth of the smallest scale division.
A comparable amount of the analysis sample is burned under the same conditions in the calorimeter. Leave a Reply Cancel reply Your email address will not be published.