Systems & CodeCâu 43 / 110
In a medical gas piping system, oxygen and other medical gases must use tubing that is cleaned and labeled for the service. What copper tubing is required for medical gas distribution?
a.Type M copper, brazed
b.PVC schedule 40
c.Type L or K copper, cleaned for oxygen service, brazed with joints purged with nitrogen
d.Galvanized steel, threaded
Giải thích
Medical gas distribution uses type L or K copper specifically cleaned and capped for oxygen service, brazed with a nitrogen purge to prevent internal oxide (copper scale) formation. The nitrogen purge keeps the interior clean so particles cannot enter patient equipment. Type M, plastic, and threaded steel are all prohibited for medical gas.
Trích dẫn luật: NFPA 99Luyện miễn phí toàn bộ 110 câu hỏi — không cần đăng ký.
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