Laserfiche WebLink
Dart Container Corporation <br />In-Service AST Inspection Report <br />Formal External Inspection of AST-1 <br />Page 4 <br /> <br /> <br /> <br />recommends installation of an operational vent and pipe with a minimum <br />diameter of 3 inches. Alternatively, the 3-inch fill piping can be reduced to 2 <br />inches to continue use of the current operational vent. Note that current <br />operational vent Tank port has a maximum allowable diameter of 4 inches. <br /> <br />Tubing from the dispenser pump was connected to the operational vent pipe. <br />The operational vent should not share space with other equipment. Condor <br />recommends rerouting the dispenser tubing to another Tank port. <br /> <br />Routine inspection and cleaning of the operational vent is required to <br />maintain proper vent operation. <br />• Installation of emergency relief venting is required for the Tank. The ERV <br />must either be a functional long bolt manway or meet the required standard <br />cubic feet per hour (SCFH) capacity based on the wetted area (75 percent of <br />the total area) of the horizontal Tank. Using the physical dimensions of the <br />Tank and reference tables in UL 142, the wetted area of the Tank was <br />approximately 584 square feet. The minimum diameter of an ERV for this <br />Tank was 8 inches. The minimum SCFM rating of an ERV for this Tank was <br />385,440. The inspector observed an 8-inch diameter Morrison Brothers <br />model 244 ERV rated for 495,000 SCFH at 3.0 pounds per square inch (psi). <br />The ERV was installed on the Tank manway cover and is shown in Photo 11. <br />The ERV appeared to be operational - the weighted cap was lifted easily by <br />the inspector and resealed properly when released. Emergency venting <br />capacity was sufficient for the Tank. <br />1.9.3. The Tank was equipped with a mechanical liquid level gauge. The gauge <br />observed onsite did not have identifiable manufacturer markings or model <br />number. However, the gauge was consistent with a Moormann 2-S - Horizontal <br />Tank Gauge (Photo 12). This particular gauge measures the amount of product in <br />the Tank rather than ullage. A sight glass display was located outside the fenced <br />area north of the Tank. At the time of inspection, the gauge reading was between <br />1 foot, 6.75 inches and 1 foot 6.875 inches. Manual measurement of the primary <br />compartment resulted in 1 foot 7 inches of product. The inspector accessed the <br />interior of the Tank through the ERV. During manual liquid level measurement, <br />the inspector also checked for the presence of water. Water finding paste was <br />applied to the measuring device which was lowered into the Tank. Water was not <br />detected. <br />Condor’s inspector reviewed the three most recent monthly inspections <br />performed by Facility personnel. Based on the documentation provided for <br />review, Facility personnel appear to be performing a check for water in the Tank. <br />According to Section 6.10 of the STI SP001 Inspection Standard, if no water is <br />found during four consecutive monthly inspections, then annual checks for water <br />in the Tank may be completed. If water is found in the Tank during the annual <br />inspection, then personnel should investigate the source of the water, remove the <br />water (test for microbial induced corrosion [MIC 1]), and revert back to monthly <br />checks for water. <br /> <br /> <br />1 If MIC is identified, additional steps to clean the Tank would be necessary.