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r.iv Y ?LL''? <br />ENVIRONMENTAL HEALTH <br />DEPARTMENT <br />Caution_ Failure to strictly follow these instructions can result <br />in serious personal injury, death, and/or property damage. <br />After the piping has passed the 50 psig (0.345 MPa) pres- <br />sure test, we recommend the contractor reduce the prod- <br />uct line pressure to a pressure of not more than 25 psig <br />(0.172 MPa) and maintain this pressure until all paving <br />has been completed. Leave pressure gauge on each line <br />for inspection. The contractor should check the gauge <br />daily to verify the pipe is holding pressure. Some fluctua- <br />tion in pressure may occur due to temperature changes. <br />Check for day-to-day changes when temperatures are <br />near the same level. <br />If a leak is encountered during the test procedure, immedi- <br />ately release all pressure in the piping system and refer repair <br />section for proper repair procedures. Upon completing any <br />necessary repairs to the piping system, follow the proper test- <br />ing sequence and verity the system's integrity. <br />Vacuum or Detectable Gas Test Procedures <br />Testing with vacuum and/or detectable gases (such as He- <br />lium) at low pressure has been successfully used with our pip- <br />ing systems. Although helium testing in a closed atmosphere <br />and at measured levels is useful, testing in the field with he- <br />lium has shown inconsistencies when attempting to identify <br />leak location. These methods require specialized equipment <br />and procedures that are beyond the scope of this manual. <br />33 <br />