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ELK RIVER ICE ARENA — ICE SYSTEM EVALUATION AND RECOMMENDATIONS <br />Recommended minimum improvements include: <br />• Investigate the integrity of the existing steel vessels and <br />piping systems: The refrigeration system was re- insulated <br />and therefore the condition of the steel vessels and piping <br />systems could not be inspected. Corrosion along the <br />bottom of the low pressure receiver is common in these <br />systems. The extent of any corrosion cannot be <br />determined without removing the insulation. The <br />recommended repair includes: removing several sections of <br />the existing insulation on the system; conducting a visual <br />inspection of the vessels and piping; and conducting a non- <br />destructive ultra sound tests of the steel. If high levels of <br />corrosion are found, the entire insulation system should be <br />removed; the surface of the vessels and piping should be <br />sanded, primed, painted; and then the entire system should <br />be re- insulated. <br />If the steel vessels and piping systems are found to be in <br />good shape, this system could last another 15 or more years <br />with the other recommended improvements completed and <br />with continued proper maintenance. <br />If extensive corrosion is found, the vessels should be <br />repaired and recertified and /or replace and piping should <br />be replaced before reinsulating. Poor insulation can aid in <br />pre- mature corrosion and loss of efficiency. <br />• Replace vent solenoids on each pumper with some <br />materials: Inspect and replace the existing valve (typically a <br />Sporlan MA50) with same model. This valve cannot be <br />replaced with a higher quality valve as manufactured by <br />Hanson due to the inadequate space. <br />Table 2. Option 2 — Minimum Improvements to Existiniz Rink 1 Svstem <br />Item <br />Cost' <br />Investigate Integrity of vessels and piping systems <br />$3,000 <br />Replace vent solenoid valves (2 total) <br />$2,000 <br />Subtotal of estimated construction costs <br />$5,000 <br />Estimate, design and constr. contingency (20 %)' <br />$1,000 <br />Total estimated construction costs <br />$6,000 <br />Engineering, legal, and administrative (18 %)' <br />$1,000 <br />Total estimated project costs <br />$7,000 <br />1. See explanation in Section 2 of this report. <br />UStevens 19 <br />PV, NWF $ 'I '11417.i <br />