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1318.13 Category 3 Dental Air and Nitrogen Supply Systems Purge Tests
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The purge tests for dental air and nitrogen supply systems shall be conducted as follows:
- The outlets in each Category 3 dental air and nitrogen supply piping system shall be purged to remove any particulate matter from the distribution piping.
- The test gas shall be oil-free, dry nitrogen NF or the system gas.
- Each outlet shall be purged with an intermittent high-volume flow of test gas until the purge produces no discoloration in a clean white cloth.
- The purging shall be started at the furthest outlet in the system and proceed toward the source equipment. [NFPA 99:5.3.12.2.8]
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