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rg NFID INTIAL' U Section 3 Observation of a Lining' Installation in Oklahoma MRI had the opportunity to observe an actual lining installation during the period from May 31 through June 2, 1995. The purpose of our observations was to compare the installation operation with the recommendations in API 1631. The lining operation was performed at a Phillip's Gas & Go at 528 S. Chickasaw in Pauls Valley, Oklahoma, south of Oklahoma City. The facility was a fairly large operation, with six pumps, a convenience store, a drive-up snack window, and a car wash. More than one tank was to be lined; we observed all but the initial steps on one tank and the beginning of the process on a second tank. The first tank was a nominal 10,000-gallon steel tank 96 inches in diameter and 27 feet long. The firm doing the work, as licensed by IECC, was Rockey's, Inc., from Topeka, Kansas. When we arrived on the job site the morning of May 31, a crew based in Topeka had already broken concrete, removed product, cut a manway, and de-sludged the tank The following paragraphs present our observations relative to API 1631. A general site inspection showed that there were no ignition sources present, the area was properly cordoned off, appropriate fire extinguishes were present, and that proper safety procedures were being carried out. Figure 1 shows a general view of the site. All equipment appeared to be properly grounded. The crew members wore proper safety gear, depending on the phase of the operation. The, foreman reported that all had been through the proper training courses. An MSA (Mine Safety Appliances) combustible gas indicator had been used to assure that the area was free of hazardous vapors. We inspected the device and found it to be in apparently good operating condition. The foreman said that it is calibrated by a laboratory semiannually. The initial ventilation was performed using a diffused air blower (method 2.4.3.2 of API 1631), which we checked OUL After the tank was deemed free of harmful vapors, continuous ventilation was provided by a squirrel cage blower (see Figure 2). This blower had an explosion-proof motor and supplied air to the tank through a 12-in flexible hose. The manway was cut to the 18-in x 18-in size required by API 1631. The sludgetabsorbent mix that was removed from the tank was placed into steel drums, which were sealed and turned over to the station operator for proper disposal. Some of these drums may be seen in Figures I and 2. Although the sludge was not tested for the presence of lead compounds, the crew followed their normal practice of handling the material as if it did contain lead, benzene, or other hazardous materials. &M-Apptkd,R4M9.FR 4