Appendix ASample Linearity Test Standard Operating Procedure
11.Make sure that each of the cylinders have not expired, and obtain a copy of each of the certification sheets.
12.Check that the cylinder cap is not stuck and that it will be possible to remove it easily in the field.
13.For each gas loaded into the audit trailer keep the cylinder certification sheets in a folder to be placed in the cab of the truck and a log sheet summarizing the contents and concentrations of each cylinder.
14.Select the proper regulator for each of the cylinders to be used.
14.a Identify the regulator. Check the label and the inlet and outlet gauges. Ascertain that the high-pressure gauge is suitable for the pressure of the cylinder value outlet.
14.bInspect the regulator. Check the regulator for evidence of damage or contamination. If there is any evidence of physical damage, or foreign material inside the regulator, contact the customer service representative for return or repair information.
15.Gather all equipment needed for performing the audit.
16.Check the condition of the tires on the audit trailer and inspect the tow vehicle prior to departure. Check for tire pressures, condition, oil level, belt conditions, etc.
17.At the appropriate facility (such as a calibration test equipment center), attach the regulators to each cylinder to check the cylinder tank pressures. If any tank has a pressure less than 700 psi it should not be used for the linearity test audit.
During the pre-inspection meeting, review the test procedure and address any special circumstances of safety issues for working in the designated area for that day.
Part 75 Field Audit Manual - July 16, 2003 Page A-33