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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 Existing Rink 1 System <br /> Item" Gast,,, <br /> Investigate Integrity of vessels and piping systems $3,000 <br /> Replace vent solenoid valves(2 total) $2,000 <br /> Subtotal of estimated construction costs $5,000 <br /> Estimate,design and constr.contingency(20%)1 $1,000 <br /> Total estimated construction costs $6,000 <br /> Engineering, legal,and administrative(18%)1 $1,000 <br /> Total estimated project costs $7,000 <br /> 1. See explanation in Section 2 of this report. <br /> 961tevens 19 <br />