ABSTRACT
The natural gas liquids industry has been striving to measure the composition of liquid streams more accurately. The chromatograph, with the use of calibration standards, has been found to be one of the most accurate means of measuring the composition of natural gas liquids streams. This chapter presents the chromatograph's need of calibration standards when analyzing natural gas liquids streams. The selection of the proper calibration standard and the production of the standard is discussed. The chapter covers cylinder selection and sampling techniques which specifically include major cylinders used for liquid samples. It also deals with checking liquid calibration standards to insure authenticity. With the use of piston displacement cylinders, natural gas liquids samples and calibration standards can be injected into chromatographs with unsurpassed accuracy.
