Standardization of Method 11at a Petroleum Refinery. Volume II.

摘要

A collaborative test was run of the revised Method 11procedures that was developed in Volume I. Ten collaborators were selected from a total of 24interested organizations. Part of the screening process was to require each potential collaborator to analyze a set of liquid samples in accordance with the procedure. A test manifold was constructed which could simulate typical refinery fuel gas streams. During February 22to 27, 1976, a total of 16runs at three different H2S levels were made,as well as a series of standard sample analyses. MRI then made a statistical analysis of the collaborators'results. Without mercaptans present,results averaged 4percent low with a standard deviation of 2percent for any single collaborator and a standard deviation between collaborators of 4percent. With mercaptans present at 150ppm,precision was unaffected but the results varied from 2percent low to 14percent high at H2S concentrations of 400and 100mg/dscm. The tentative procedure was found to be adequately written for those knowledgeable of sampling and analysis techniques.