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3. Engineering Review of Tanks & Equipment Covered by CalARP Program C:\TRICH\Jobs\4515582 Leprino Tracy\Report\Leprino Tracy CalARP 040221.docx 3-5 Equipment in the Main Engine Room was manufactured between 1973 and 2002. Therefore, all the equipment is not accepted purely based on date of installation per CalARP guidelines. Calculations indicate that floor mounted equipment in this room would be designed for 43% of gravity if anchorage were designed to the current code based on factors associated with pressure vessels without skirts at grade. This applies to all the compressors. Based on analyses of the compressors, they have adequate anchorage with a maximum demand-to-capacity ratio (DCR) of 0.70. The suction trap tank (SA-1) is supported by two pipe columns that are anchored to the floor and adjacent wall. However, no u-bolts were observed at the support points indicating that the columns only provide vertical support for the tank (Figure 3-27). A positive connection to the supports is required to provide lateral support to the tank. Additional lateral bracing or restraint may be necessary. Piping in the Main Engine Room appears inadequately braced (Figure 3-28). Only vertical support hangers were observed. Vertical hangers appear to be either directly welded to roof framing members or attached to roof framing using compression clamps without restraining straps, which would prevent them from falling off the beam if they become loose (Figure 3-29). Without lateral bracing, the piping may sway excessively resulting in damage to the piping or connections to the equipment. Roof above the Main Engine Room There are six evaporative condensers (cooling towers) with ammonia supported by the roof over the Main Engine Room including EC-1, EC-2, EC-3, EC-4, EC-6 and EC-7. Condenser EC-5 does not utilize ammonia. Condensers EC-1 and EC-2 are adequately welded directly to the support framing with approximately thirty ¼-inch welds that are each approximately 4 to 6 inches long. The resulting DCR ratio is 0.02. As recommended by the previously evaluation, angle snubbers welded to the support framing were provided at the corners of condensers EC-3 and EC-4 (Figures 3-30 and 3-31). The calculated DCR ratio for the snubbers is 0.21. The restraint for condenser EC-6 has been updated with snubber angles welded to the support framing as recommended by the previous evaluation (Figures 3-32 and 3-33). The resulting DCR ratio is 0.38. EC-7 is adequately secured