Examination of Vapor-Measuring Devices for U.S. DEPARTMENT OF COMMERCE, Rogers C. B. Morton, Secretary Dr. Betsy Ancker-Johnson, Assistant Secretary for Science and Technology Issued December 1975 For sale by the Superintendent of Documents, U.S. Government Printing Office, Washington, D.C. 20402 (Order by SD Catalog No. C13.11:117). Price 75 cents. (Add 25 percent additional for other than U.S. mailing). Engineering Depos-USA 1-30-76 Preface This publication is one of a number of Handbooks of the National Bureau of Standards (NBS) designed to present in compact form comprehensive technical guides for State and local weights and measures officials. This particular Handbook treats the examination of liquefied petroleum gas vapor-measuring devices. The Handbook is part of a series which will supersede NBS Handbook 45, Testing of Measuring Equipment. Each of the several types of measuring devices is being considered separately in acknowledgment of the increasing specialization in weights and measures supervision, the rapidly developing technological character of commercial measurement, and the everchanging equipment utilized in the measurement process. Authority for such activity on the part of the Bureau is found in basic legislation (64 Stat. 371) wherein the Bureau is authorized to undertake, among others, the following functions: "cooperation with the States in securing uniformity in weights and measures laws and methods of inspection," and "The compilation and publication of general scientific and technical data resulting from the performance of the function specified herein or from other sources when such data are of importance to scientific or manufacturing interests or to the general public, and are not available elsewhere ***" The Handbook is published in loose-leaf form to permit updating as required, thus furthering its usefulness to the official in his field operations. This publication is prepared primarily for testing with a bell prover since this is the predominant proving procedure in use at the present time. Other acceptable meter proving procedures are in existence and others probably will be developed in the future. This publication is not intended to limit the proving of the devices to bell proving equipment. The Handbook has been prepared to be used with metric as well as customary units. Wherever applicable, tables have been provided in both units. In the procedure itself, only customary units are used when dealing with various units of measurement. The accepted practice is to use whole units, however, the industry has not made any decisions concerning such metric equivalents for a "hard conversion." To assist the reader, all metric and customary units are defined with respect to each other in the "Definitions" and sample report data tables have also been prepared using metric units. Although this Handbook is prepared primarily for use by weights and measures officials of the States, counties, and cities, it is believed that the information presented will be useful to manufacturers, commercial, and industrial establishments interested in the measurement of liquefied petroleum gas. |