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5503: Compressed Natural Gas Retail Motor Fuel Dispenser

This 3-day seminar will teach students how to properly inspect and test CNG RMFD systems; that is, perform an official examination by properly applying all applicable NIST Handbook 44 requirements, which are outlined in NIST EPO 28. The sessions will include formal lecture, class discussion, group exercises, audio-visual presentations, and some hands-on practice.

Learning Objectives:

Upon completion of the course, you should be able to:

  • IDENTIFY and DESCRIBE the major types of metering systems used for commercial measurement and delivery of CNG;
  • DESCRIBE the design and operation of typical CNG RMFD metering systems and their major components, especially those involved in measuring, indicating, recording, and delivering product;
  • UNDERSTAND and DESCRIBE basic safety procedures and equipment, including emergency procedures, employed in examining CNG RMFD systems;
  • IDENTIFY appropriate test equipment and field test standards used for testing these metering systems in the field and describe procedures for setup, operation, and maintenance of this equipment;
  • DESCRIBE procedures for inspecting CNG RMFD systems to determine whether they conform with specifications and other requirements set forth in NIST Handbook 44 and in accordance with NIST Examination Procedure Outlines for Weighing and Measuring Devices;
  • DESCRIBE procedures for testing these metering systems in the field to determine whether or not they conform to performance requirements set forth in the latest edition of NIST Handbook 44, “Specifications, Tolerances, and Other Technical Requirements for Weighing and Measuring Devices;” and
  • DESCRIBE post-examination tasks that must be performed upon completion of an official field examination, including documentation and recordkeeping.

Materials & Supplies:

Notebooks and class materials will be provided.


Participants must have completed the NIST Handbook-44 Self Study course.

Minimum Requirement(s):

Students must be in attendance for the entire class and actively participate in all class activities. You will be assessed on your application of all learning objectives for this course.


State weights and measures officials. Industry by invitation only.


There is no registration fee for this training. However, participants are responsible for their travel, lodging and meal expenses.


Rick Harshman and Juana Williams
Office of Weights and Measures,
Phone: (301) 975-8107 / (301) 975-3989
Email: richard.harshman [at] (richard[dot]harshman[at]nist[dot]gov) / juana.williams [at] (juana[dot]williams[at]nist[dot]gov)

Technology Requirement(s):

Students MUST bring a scientific calculator to the class that is capable of performing statistical functions, a square root, and standard deviation function.


NIST / Office of Weights and Measures
Indiana Department of Health, Weights & Measurers Division

Created May 16, 2017, Updated June 1, 2017