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ELK RIVER ICE ARENA - ICE SYSTEM EVALUATION AND RECOMMENDATIONS <br />American Engineering Testing performed ultra sound <br />testing on the low pressure receiver to investigate the <br />effect of visible corrosion on the vessel. The test reportedly <br />showed no loss of vessel wall thickness. <br />• The existing evaporative condensing tower was replaced 5 <br />years ago and is in good condition. It is manufactured by <br />Balitimore Aircoil Company (BAC). A variable frequency <br />drive was installed on the system when the new condenser <br />was installed.. This system uses air and water to dissipate <br />heat for the refrigeration processes. <br />• Waste heat is recovered and used for serving the snow melt <br />pit and the subfloor heating system beneath the rink floor. <br />The existing snow melt pit in the in- ground type which does <br />not work very well in terms of both allowing snow into the <br />pit and quickly heating and melting the snow. The <br />remainder of the heat is dissipated to the atmosphere, <br />through the condensing tower. <br />• The ice rink floor is a direct refrigeration ice rink floor. The <br />floor, which measures 100 feet x 200 feet, is larger than the <br />standard NHL size of 85 feet x 200 feet. The 15 -year old rink <br />floor is likely constructed to the standard design: 3 -4 inches <br />of floor insulation; Yz inch steel tubing installed at 4 inches <br />on- center with welded connections; and a 5 inch of <br />reinforced concrete. The only reported problem with the <br />existing rink floor is that oil gets trapped in several of the <br />tubes causing streaks and sometimes poor ice quality in <br />those locations. <br />• The existing dasher board system was installed new in <br />1997. It is a steel framed system with a supported tempered <br />glass system. The system is in very condition and should <br />have life expectancy of approximately 20 -25 years. <br />• The existing refrigeration room for Rink 2 is fairly large at <br />576 square feet. The room is equipped with mechanical <br />ventilation and refrigerant leak detection systems. It was <br />not verified whether an emergency stop switch or <br />ventilation switch was located near the exterior door as is <br />required by code. <br />U Stevens 12 <br />. nNNERS SURVEYORS <br />