【国外标准】 Standard Test Method for Calorific (Heating) Value of Gases in Natural Gas Range by Continuous Recording Calorimeter

4.1 This test method provides an accurate and reliable method to measure the total calorific value of a fuel gas, on a continuous basis, which is used for regulatory compliance, custody transfer, and process control.1.1 This test method covers the determination with the continuous recording calorimeter (Note 1) of the total calorific (heating) value of fuel gas produced or sold in the natural gas range from 900 to 1200 Btu/standard ft3.NOTE 1: An extensive investigation of the accuracy of the Cutler-Hammer recording gas calorimeter, when used with gases of high heating value, was made by the National Bureau of Standards in 1957 under a research project sponsored by the American Gas Association.1.2 The subjects covered in this test method appear in the following sections:  SectionsAir-Gas Ratio Test 11Apparatus  5Basis of Measurement 14Cold Balance Test 10Compensation of Complicating Factors 13Condition of Gas Sample  7Definitions  2Installation of Apparatus  6Maintenance Appendix X1Operating Precautions Appendix X2Operation and Checking of Apparatus  9Precision 15  1  4Standardization of Calorimeter 12Standardization, Preliminary, of Calorimeter by Hydrogen  8Summary of Test Method  31.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. 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.1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.